bluuebunny/crossref_metadata_2025_split huggingface dataset:
Living free radical donor‐acceptor copolymerization of styrene and N‐cyclohexylmaleimide and the synthesis of poly[styrene‐co‐(N‐cyclohexylmaleimide)]/polystyrene block copolymers
Authors: Schmidt‐Naake Gudrun , Butz Sören 
Published: April 2003

AbstractStyrene/N‐cyclohexylmaleimide copolymers with small polydispersities and controlled molecular weights were synthesized by a free radical copolymerization using an iniferter system consisting of benzoyl peroxide and 2,2,6,6‐tetramethylpiperidine‐N‐oxyl. Due to the interactions of the electropositive (styrene) and electronegative (N‐cyclohexylmaleimide) monomers the brutto polymerization rates are higher than for other living polymerizations initiated with the same iniferter system. The prepared copolymers were used as macroiniferters for bulk polymerization of styrene.
“Living radical” polymerization of styrene in the presence of a nitroxide compound
Authors: Hammouch Saíd Oulad , Catala Jean‐Marie 
Published: April 2003

AbstractThe influence of parameters such as styrene dilution and active site concentration on the polymerization of styrene in the presence of a di‐tert‐butyl nitroxide adduct (A‐T) was examined. It is confirmed that the rate of styrene polymerization is independent of A‐T concentration, with no monomer dilution effect. An increase in radical concentration generated in the medium leads to faster propagation, but the molecular weight of the polymers formed is alway controlled by the A‐T concentration.
Synthesis of a functional polymer with pendent luminescent phenylenevinylene units through nitroxide‐mediated free‐radical polymerization
Authors: Moroni Marc , Hilberer Alain , Hadziioannou Georges 
Published: April 2003

AbstractIn this communication we report the synthesis and the efficient polymerization of a PPV trimer, 4‐tert‐buty1‐4′‐(4‐vinylstyryl)‐trans‐stilbene. By using the TEMPO (2,2,6,6‐tetramethylpiperidin‐1‐yloxy)‐mediated free‐radical polymerization method, the corresponding polymer was obtained in high yields, with a fair molecular weight and a small polydispersity. The presence of phenylenevinylene units in the side chains of the polymer gives rise to efficient blue fluorescence which makes the material suitable for light emission applications.
Cyclodextrin sidechain polyesters — synthesis and inclusion of adamantan derivatives
Authors: Weickenmeier Meik , Wenz Gerhard 
Published: April 2003

AbstractAn efficient synthesis of a cyclodextrin polymer by a polymer‐analogous reaction of lithium β‐cyclodextrinate with poly[(N‐vinyl‐2‐pyrrolidinone)‐co‐(maleic anhydride)] is described. Because cyclodextrin polymer is highly water‐soluble, its binding of guests, like 1‐adamantanamine and l‐adamantanecarboxylic acid, could be investigated by titration microcalorimetry. All cyclodextrin moieties are accessible by the guest within the polymer, but binding constants are slightly lower than those for native β‐cyclodextrin. Binding constants are influenced by Coulomb interactions between the guest and the anionic polymer backbone.
Synthesis of comb‐like polyurethanes containing hydrophilic phosphatidylcholine analogues in the main chains and hydrophobic long chain alkyl groups in the side chains
Authors: Li Yu‐Jun , Nakamura Naotoshi , Chen Tian‐Ming , Wang Yan‐Feng , Kitamura Masaya , Nakaya Tadao 
Published: April 2003

AbstractThree new amphiphilic phospholipid diols containing hydrophilic phosphatidylcholine analogues in the main chains and hydrophobic octadecyl, hexadecyl or dodecyl alkyl groups in the side chains were synthesized. The typical phospholipid diol based on an octadecyl group was further reacted with diisocyanates such as hexamethylene diisocyanate (HDI), 2,4‐tolylene diisocyanate (TDI) and 4,4′‐methylenediphenyl diisocyanate (MDI), respectively. Preliminary studies suggest that polyurethane based on MDI shows a viscosity behavior similar to common polyelectrolytes and exhibits a therm decomposition peak at 244°C due to the phospholipid moiety and a melting point at 218°C.
Photo‐driven liquid crystal cell using azobenzene‐grafted ladderlike polysiloxane as command layer
Authors: Tang Yongxin , Liu Dongsheng , Xie Ping , Zhang Rongben 
Published: April 2003

AbstractA novel photo‐driven liquid crystal (LC) cell was fabricated by sandwiching nematic LC molecules between two quartz plates whose surface was modified with 4‐hexyloxy‐4′‐undecanyloxyazobenzene (6Az11)‐grafted ladderlike copoly(methylhydrosilsesquioxane) (PMHSQ). Reversible changes of the alignment between homeotropic and planar modes were achieved. The transmittance through the cell and crossed polarizers could be controlled by the irradiation intensity of 365 nm UV light. A high contrast ratio over 100:1 was obtained.
Polymerization of 1,3‐butadiene, 4‐methyl‐1,3‐pentadiene and styrene with catalyst systems based on biscyclopentadienyl derivatives of titanium
Authors: Ricci Giovanni , Bosisio Carlo , Porri Lido 
Published: April 2003

Abstract1,3‐Butadiene, 4‐methyl‐1,3‐pentadiene and styrene were polymerized with dicyclopentadienyltitanium dichloride/methylaluminoxane (Cp2TiCl2/MAO) and dicyclopentadienyltitanium chloride/MAO (Cp2TiCl/MAO). These systems are less active than cyclopentadienyltitanium trichloride/MAO (CpTiCl3/MAO), but show the same stereospecificity as the latter; they give predominantly cis‐1,4‐polybutadiene, 1,2‐syndiotactic poly(4‐methyl‐1,3‐pentadiene) and syndiotactic polystyrene. Cp2TiCl/MAO is much more active than Cp2TiCl2/MAO; this is probably due to the fact that in the reaction of Cp2TiCl2 with MAO, only a small amount of Ti(IV) is reduced to Ti(III), which is the active species in the polymerization of styrene and 1,3‐dienes. An interpretation of the structure of the active species in Cp2TiCl/MAO is reported.
Potassium hydride — the new initiator for anionic polymerization of oxiranes
Authors: Stolarzewicz Andrzej , Neugebauer Dorota , Grobelny Janusz 
Published: April 2003

AbstractPotassium hydride with 1,4,7,10,13,16‐hexaoxacyclooctadecane (18‐crown‐6) was used in the anionic polymerization of (butoxymethyl)oxirane. Polymers with low ratio of mass‐ to number‐average molar masses (M̄w/M̄n < 1.1) were obtained, each macromolecule being terminated (after hydrolysis) with a hydroxyl group on both of its ends. Chain transfer reactions to the monomer were not observed to operate in this system.
Thermal polymerizations of alkali 4‐(1‐bromoethyl)benzoates
Authors: Inoki Mari , Akutsu Fumihiko , Kitayama Yasuyuki , Shinoda Koichi , Kasashima Yoshio , Naruchi Kiyoshi 
Published: April 2003

AbstractThermal reactions of alkali salts of 4‐(1‐bromoethyl)benzoic acid in bulk were investigated. These reactions were found to produce unexpectedly the graft copolymer, poly(4‐vinylbenzoate)‐graft‐oligo(oxycarbonyl‐1,4‐phenylenethylidene) (1). The relative reactivity of the oligocondensation as well as the vinyl polymerization of the salts decreased in the following order: K > Na > Li. The reaction polymerization rate proceeded rapidly during the initial 15 min, and then slowed down.
Synthesis of new smectic C* liquid‐crystalline block copolymers
Authors: Zheng Wen Yue , Hammond Paula T. 
Published: April 2003

AbstractA series of smectic C* liquid‐crystalline (LC) block copolymers were successfully synthesized via the living anionic polymerization of polystyrene with optically active methacrylate monomers containing (S)‐2‐methylbutyl 4‐(4‐hydroxyphenylcarbonyloxy)‐biphenyl‐4′‐carboxylate mesogens. These materials are the first reported smectic C* block copolymers. Anionic polymerization in tetrahydrofuran (THF) at −70°C leads to LC block molecular weights of approximately twenty repeating units. The number‐average molecular weight of the polystyrene block was varied from 7000 to 20000 to adjust the composition in the block copolymers. Differential scanning calorimetry and optical microscopy indicate that the smectic C* phase is present in the systems over broad temperature ranges.
Copolymerization of ethylene and 1‐octene with Cp*TiCl3 as catalyst supported on 3‐aminopropyltrimethoxysilane treated SiO2
Authors: Uozumi Toshiya , Toneri Tatsuya , Soga Kazuo , Shiono Takeshi 
Published: April 2003

AbstractTwo kinds of SiO2‐supported Cp*TiCl3 (Cp* = η5‐1,2,3,4,5‐pentamethylcyclopentadienyl) catalysts were prepared, using SiO2 modified with 3‐aminopropyltrimethoxysilane (NSiO2) and the ordinary SiO2 as the carrier. The copolymerization of ethylene and 1‐octene was conducted over them combined with methylaluminoxane (MAO) as cocatalyst. From a detailed analysis of the produced copolymers, it was found that the NSiO2 supported Cp*TiCl3 catalyst gives poly(ethylene‐co‐1‐octene) with a higher content of 1‐octene and a narrower molar mass distribution as well as a narrower chemical composition.
Poly(divinylsiloxyethylene glycol) — synthesis and photoresist characteristics
Authors: Aoki Hidetoshi , Tokuda Takashi , Nagasaki Yukio , Kato Masao 
Published: April 2003

AbstractPoly(siloxyethylene glycol) The term “poly(siloxyethylene glycol)” was used by us in our previous paper10 for the following polymer skeleton:
magnified image

with pendant vinyl groups (PVSE) was synthesized by polycondensation of oligo(ethylene glycol) (MW = 300) and diaminodivinylsilane. PVSE300 thus obtained is soluble in cold water. The PVSE300 coupled with a polythiol compound shows properties of a negative working photoresist. A negative tone image was obtained by development with water at 4°C. PVSE300 is a new type of Si‐containing polymer resist which can be developed by water.
Characteristics of liquid‐crystalline cholesteryl and cyanobiphenyl side chains pendent to trans‐polypentenamer
Authors: Cho Iwhan , Chang Kyeongho 
Published: April 2003

Abstracttrans‐Polypentenamers with thermotropic liquid‐crystalline side chains cholesteryl and cyanobiphenyl were prepared by ring‐opening polymerization of vinylcyclopropane monomers with proper substituents. Molecular weights of the polymers were in the range of 25000 to 80000 and the ratios of weight‐ to number‐average molecular weights Mw/Mn were between 3.3 and 3.8. The glass transition temperature values of the polymers were 35°C (4a) and 39°C (4b). Monomers 3a and 3b present cholesteric and smectic mesomorphism, respectively. On the other hand, polymers 4a and 4b present only a smectic mesophase.
Side‐chain liquid crystalline copolymers with non‐mesogenic comonomers – influence of comonomer content on the nature of the mesophase
Authors: Sänger Jörg , Gronski Wolfram 
Published: April 2003

AbstractStatistical copolymers with mesogenic and non‐mesogenic comonomer units were synthesized by partial hydroboration of the 1,2‐units of polybutadiene and subsequent conversion of the alcohol groups to mesogenic units. The nature of the LC phase proves to be dependent on the mesogen content. Below a certain content the smectic C phase vanishes, and the polymer becomes cypotactic nematic. Tg, Ts,n, Tn,i and ΔHs,n depend on the mesogen content, whereas ΔHn,i is independent. No difference can be detected between the phase behaviour of homopolymers and ABA‐triblock copolymers with a liquid crystalline B‐block and 10 wt.‐% polystyrene A‐blocks.
NMR study of doped poly(2,5‐dimethylaniline)
Authors: Geng Yanhou , Jing Xiabin , Li Ji , Wang Fosong 
Published: April 2003

AbstractStructure changes and charge transfer in the doping process of poly(2,5‐dimethylaniline) (PDMA) were studied by NMR technique. It was shown that not only the polymer chain but also the hydrogen atoms and methyl groups on the aromatic rings were involved in the charge transfer process. A “four ring BQ derivatives” model was proposed to explain the NMR results.
Light emitting diodes based on a discotic main chain polymer
Authors: Christ Thomas , Stümpflen Volker , Wendorff Joachim H. 
Published: April 2003

AbstractWe prepared light emitting diodes with a discotic main chain polymer doped with a tristilbene amine derivative. X‐ray investigations showed the formation of a hexagonal columnar structure in the annealed devices. This increased order leads to a significant reduction of the onset voltage for light emission down to 4 · 105 V/cm.
Cloud point of poly(N‐isopropylmethacrylamide) solutions in water: is it really a point?
Authors: Netopilík Miloš , Bohdanecký Miloslav , Chytrý Vladimír , Ulbrich Karel 
Published: April 2003

AbstractTime‐dependent phase separation/transition was observed in aqueous solutions of poly(N‐isopropylmethacrylamide) in the temperature range 38–42°C. The time before the second phase appears is a function of temperature and may reach up to several hours.
Synthesis of amphiphilic graft copolymers by ring‐opening polymerization of 2‐methyl‐2‐oxazoline initiated by poly[isobutene‐co‐(p,m‐chloromethylstyrene)] macroinitiators
Authors: Nuyken Oskar , Sanchez Juan Rueda , Voit Brigitte 
Published: April 2003

Abstractpoly[isobutene‐co‐(p,m‐chloromethylstyrene)]‐graft‐poly(2‐methyl‐2‐oxazoline) graft copolymers (GP) were prepared by the “grafting from” method throught the cationic polymerization of 2‐methyl‐2‐oxazoline (MeOXA) initiated by a statistical copolymer is isobutene and chloromethylstyrene. The unusual viscosity behavior in chloroform solution of these polymers, the dynamic laser light scattering analysis in aqueous solution, as well as the solubility in polar solvents like water and methanol demonstrate the amphiphilic character of the graft copolymers and indicate the formation of aggregates in solution.
Thermal stability of syndiotactic polypropene
Authors: Mori Hideharu , Hatanaka Tomoyuki , Terano Minoru 
Published: April 2003

AbstractThermal stability of syndiotactic polypropene (syn‐PP) was investigated by comparison with isotactic polypropene (iso‐PP). Heat treatments were carried out in air at 160–220°C for 10–30 min. Under these conditions, molecular weight and molecular weight distribution of syn‐PP were almost kept constant, indicating the high stability of syn‐PP. Iso‐PP was degraded drastically under the same conditions. Thus, it is confirmed that the stereoregularity is one of the dominant factors to determine the stability of PP.
Effect of cocatalysts on the character of a constrained geometry catalyst
Authors: Shiomura Tetsunosuke , Asanuma Tadashi , Sunaga Tadahiro 
Published: April 2003

AbstractA constrained geometry catalyst (CGC) precursor, Me2Si(Flu)(N‐t‐Bu)ZrX2 (X = Cl or NMe2), behaved as a single site catalyst with methylaluminoxane (MAO) as cocatalyst, while it developed much diversified catalytic species with AIR3/Ph3CB(C6F5)4 as cocatalyst. The catalytic performance was not affected if X is Cl or NMe2.
Chemoselectivity in 4‐methyl‐1,3‐pentadiene polymerization in the presence of homogeneous Ti‐based catalysts
Authors: Longo Pasquale , Grisi Fabia , Proto Antonio , Zambelli Adolfo 
Published: April 2003

AbstractThe homogeneous catalyst CpTiCl3‐MAO is able to produce a random copolymer of 4‐methyl‐1,3‐pentadiene with ethylene. 13C NMR analysis of the copolymers shows that after insertion of ethylene units, the next 4‐ymethyl‐1,3‐pentadiene unit can be inserted in either 1,2 or 1,4 arrangement. The high chemoselectivity observed in the 1,2‐syndiotactic homopolymerization of 4‐methyl‐1,3‐pentadiene with respect to the lower one observed in the copolymerization with ethylene is attributed to a back‐biting coordination to the Ti of the active species of the penultimate monomer unit of the growing chain.
Effects of poly(methyl methacrylate)‐block‐poly(vinyl acetate) copolymer on the spinodal decomposition of corresponding homopolymer blends
Authors: Chen Wenjie , Shen Zhong , Huang Xiaoyu , Huang Junlian 
Published: April 2003

AbstractEffects of adding a small amount of poly(methyl methacrylate)‐block‐poly(vinyl acetate) (PMMA‐b‐PVAc) to poly(methyl methacrylate)/poly(vinyl acetate) (PMMA/PVAc) blends with a lower critical solution temperature (LCST) phase diagram on the kinetics of late‐stage spinodal decomposition (SD) were investigated by time‐resolved light scattering at 160°C. It is found that the coarsening process of the structure was slowed down or accelerated upon addition of PMMA‐b‐PVAc depending on the composition of the block copolymer and the blend. The effect of the block copolymer on the domain size were interpreted as compatibilizing and incompatibilizing effects of the block copolymer on PMMA/PVAc blends based on the evaluation of changes in the stability limits of PMMA/PVAc with the addition of block copolymer using random phase approximation (RPA).
Gas phase polymerization of ethylene with a silica‐supported metallocene catalyst: influence of temperature on deactivation
Authors: Roos Peter , Meier Gerben B. , Samson Job Jan C. , Weickert Günter , Westerterp K. Roel 
Published: April 2003

AbstractEthylene was polymerized at 5 bar in a stirred powder bed reactor with silica supported rac‐Me2Si[Ind]2ZrCl2/methylaluminoxane (MAO) at temperatures between 40°C and 80°C using NaCl as support bed and triethylaluminium (TEA) as a scavenger for impurities. For this fixed recipe and a given charge of catalyst. the average catalyst activity is reproducible within 10% for low temperatures. The polymerization rate and the rate of deactivation increase with increasing temperature. The deactivation could be modeled using a first order dependence with respect to the polymerization rate.
Improved synthesis of cyclic and polymeric phosphazenes based on facile chlorine substitution with phenols promoted by cesium carbonate
Authors: Carriedo Gabino A. , Alonso Francisco J. García , González Pedro A. 
Published: April 2003

AbstractIn this report we describe a very convenient synthetic method for the preparation in high yields and purity of cyclic [N3P3(OCH2CF3)6] and [N3P3(OC6H4R)6] (R = Br, CN, CHO, COC6H5, COCH3, H, OCH3), and polymeric [NP(OC6H4R)2]n (R = Br, CHO, COC6H5, H, But) phosphazenes from the direct reaction of the trimer [N3P3Cl6] or the high polymer [NPCl2]n and the alcohol HOCH2CF3 or the para‐substituted phenols HOC6H4R, using Cs2CO3 as proton abstractor and acetone or tetrahydrofuran as solvent.
A novel synthesis of acrylic acid containing polymers
Authors: Xiang Maoliang , Jiang Ming , Kong Xiangming , Yang Yiquing , Lu Wenkui 
Published: April 2003

AbstractA novel synthesis of linear acrylic acid containing polymers, poly(styrene‐co‐acrylic acid) and poly(acrylic acid), was accomplished through hydrolysis of the respective parent polymers, i.e. poly(styrene‐co‐methyl acrylate) and poly(methyl acrylate), with trimethylsilyl iodide under mild conditions. Combination of 1H NMR, 13C NMR, FTIR, DSC and chemical titration confirms that the conversion from methoxycarbonyl to carboxyl is almost complete. This method is further successfully applied to synthesize poly‐(ethyl methacrylate‐co‐acrylic acid) through selective hydrolysis of the methyl acrylate units in poly(ethyl methacrylate‐co‐methyl acrylate).
Ethylene polymerization with homogeneous Ziegler‐Natta catalysts: theoretical study on the role of ion pairs in the polymerization mechanism
Authors: Fusco Roberto , Longo Luca , Masi Francesco , Garbassi Fabio 
Published: April 2003

AbstractThe thermodynamics of the reaction of an ethylene molecule with the Cp2TiCH3Cl/Al(CH3)2Cl system (Cp = η5‐C5H5), as a model for olefin polymerization with homogeneous Ziegler‐Natta catalysts, was investigated via quantum mechanical DFT calculations. The comparison of the calculated energies for three possible titanium‐olefin coordinated intermediates, the ionic complex Cp2TiCH3(C2H4)+/Al(CH3)2Cl, the bimetallic complex Cp2TiCH3(C2H4)δ+ · Al(CH3)2Cl and the olefin‐separated ion pair Cp2TiCH/C2H4/Al(CH3)2Cl, shows that the most feasible polymerization mechanism occurs via olefin‐separated ion pair.
Photoinitiators and photoinitiation, 12. The aromatic ketone/t‐amine Type‐II photoinitiating system. Identification of the initiating species
Authors: Hageman Hendrik J. 
Published: April 2003

AbstractThe system benzophenone/N,N‐dimethylaniline (DMA) representing a typical Type‐II photoinitiating system is irradiated in the presence of 1,1‐di(p‐tolyl)ethylene (DTE) as a non‐polymerising model substrate. In the presence of DMA the excited triplet state of benzophenone is not quenched by DTE and N‐[3,3‐di(p‐tolyl)propyl]‐N‐methylaniline is isolated as the major product, indicating the DMA derived radical as the main initiating species in such Type‐II systems. The mechanism of the reaction and its implications are discussed.
13C‐enriched end groups of poly(3,7‐dimethyl‐1‐octene) prepared in the presence of isotactic specific catalysts
Authors: Longo Pasquale , Oliva Patrizia , Oliva Leone 
Published: April 2003

AbstractPolymerizations of (R,S)‐3,7‐dimethyl‐1‐octene in the presence of heterogeneous or homogeneous isotactic specific catalysts give very similar products with a homopolymeric isotactic structure. The insertion of (R,S)‐3,7‐dimethyl‐1‐octene into the metal‐CH3 bond (both heterogeneous and homogeneous catalysts) is highly stereospecific and stereoselective.
Polypeptide‐synthetic polymer hybrids, 1. Miscibility of poly(vinyl alcohol) with poly(sodium α,β‐D,L‐aspartate)
Authors: Takasu Akinori , Aoi Keigo , Okada Masahiko 
Published: April 2003

AbstractThe present paper describes materials of polypeptide‐commodity polymer hybrids from poly(vinyl alcohol) (PVA) and poly(sodium α,β‐D,L‐aspartate) (1). Miscible blend films of polypeptide 1 and PVA were prepared by the solvent‐cast method from a homogeneous aqueous solution. Differential scanning calorimetry. Fourier transform infrared, and scanning electron microscopy combined with energy dispersive X‐ray spectroscopy (EDX) were used to investigate the blends. It was revealed that 1 and PVA are miscible in a wide range of compositions.
Silylation of cellulose and low‐molecular‐weight carbohydrates with hexamethyldisilazane in liquid ammonia
Authors: Mormann Werner , Wagner Thomas 
Published: April 2003

AbstractSilylation of cellulose and some low‐molecular‐weight hydroxy compounds (1,2‐propanediol, D‐glucose, methyl α‐D‐glucoside, sucrose and β‐cyclodextrin) has been performed with hexamethyldisilazane (HMDS) in liquid ammonia at elevated temperature in an autoclave. No salt‐like by‐products are formed and no tedious purification of the products is necessary. As indicated by size‐exclusion chromatography the silylation of cellulose with HMDS/NH3 proceeds without degradation of the polymer chain. The degree of silylation of the trimethylsilylcellulose obtained is higher than with other silylation procedures reported in the literature. The temperature/composition diagram of HMDS/NH3 proved complete miscibility above 24°C.
Synthesis and properties of polyamides based on (±)‐norbornane‐2 endo, 3exo‐dicarboxylic acid
Authors: Flugel Michael , Heitz Walter 
Published: April 2003

AbstractA series of polyamides was synthesized by interfacial polycondensation of (±)‐norbornane‐2‐endo,3exo‐dicarbonyl dichloride with various aliphatic diamines, H2N(CH2)mNH2 with m = 2, 3, 4, 6, 8, 10. The use of chlorobenzene as organic solvent is favourable for the preparation of high molecular weight polymers. Inherent viscosities of 0.51 – 1.63 dL/g were obtained. Differential scanning calorimetry of polymers with m = 3, 4, 6, 8, 10 revealed glass transition temperatures between 119 and 189°C, whereas no Tg could be determined for m = 2. The 5% weight loss temperatures ranged from 295 to 371°C in nitrogen atmosphere. The polymers are amorphous as shown by X‐ray and DSC experiments.
Coupling of benzyl halides mediated through alkali metal supramolecular complexes. A novel route to poly(p‐xylylene)
Authors: Jedliński Zbigniew J. , Janeczek Henryk , Matuszowicz Andrzej , Grobelny Janusz 
Published: April 2003

AbstractCoupling of benzyl bromide giving 1,2‐diphenylethane was demonstrated to proceed at room temperature in THF solution mediated by the potassium/18‐crown‐6 supramolecular complex. Based on this model reaction a novel method for the low temperature synthesis of poly(p‐xylylene) from α,α′‐dibromo‐p‐xylene is proposed. Experimental evidence of the polymer structure was provided by solid‐state 13C NMR and IR spectroscopy.