Query: Poly(p-hydroxystyrene)

title: Preparation of silica supported 1 nitroso 2 naphthol grafted poly(p hydroxystyrene) resin for the removal of trace cobalt from acidic solution
abstract: Trace cobalt ion in the zinc sulfate electrolyte is the most difficult to be removed among all metallic impurities and has the most detrimental effect on zinc electrowinning. In this study, poly(p hydroxystyrene) resin was first prepared from polystyrene, and then 1 nitroso 2 naphthol was grafted onto poly(p hydroxystyrene) resin through O group by a series of reactions to obtain the 1 nitroso 2 naphthol grafted poly(p hydroxystyrene) resin. Finally, the grafted resin was supported on SiO2. The supported resin could removal trace cobalt ions with good selectivity and reusability in the zinc sulfate leachate, which can meet the requirements of the industrial electrolytic zinc process.

title: Synthesis of amphiphilic diblock copolymers of isotactic polystyrene block isotactic poly(p hydroxystyrene) using a titanium complex with an [OSSO] type bis(phenolate) ligand and sequential monomer addition
abstract: A series of isotactic diblock copolymers of polystyrene block poly(p tert butyldimethylsilyloxystyrene) (iPS b iP(p TBDMSOS) were successfully synthesized using living coordination polymerization techniques with a kind of titanium dichloro complex containing a 1,4 dithiabutandiyl linked [OSSO] type bis(6 cumyl 4 methyl phenolato) ligand (complex 1) activated by methylaluminoxane (MAO) as a catalyst. Nuclear magnetic resonance (NMR) gel permeation chromatography (GPC) infrared spectroscopy (IR) and differential scanning calorimetry (DSC) were used to characterize the copolymers. iPS b iP(p TBDMSOS) had a higher molecular weight than that of the iPS prepolymer, and a narrow molecular weight distribution below 1.35. The diblock copolymers displayed two glass transition temperatures (Tg) at ~97 and ~117 degC, originating from iPS and iP(p TBDMSOS) blocks, respectively. Furthermore, a novel well defined amphiphilic diblock copolymer consisting of iPS (nonpolar block) and isotactic poly(p hydroxystyrene) (iP(p HOS) polar block) was achieved through hydrolysis of iP(p TBDMSOS) block of iPS b iP(p TBDMSOS) in the presence of hydrochloric acid. The obtained amphiphilic diblock copolymers self assembled into spherical micelles with size of approximately 70 nm in methanol.

title: Synthesis and characterization of isotactic poly(p hydroxystyrene) block 1,4 trans polybutadiene by sequential monomer addition using titanium complex with an [OSSO] type Bis(phenolate) ligand
abstract: Herein, we demonstrated the synthesis and characterization of a well defined diblock copolymer consisting of isotactic poly(p hydroxystyrene) (iP(p HOS) and 1,4 trans polybutadiene (1,4 trans PBD) iP(p HOS) b 1, 4 trans PBD, by the combination of sequential monomer addition and deprotection. Isospecific living polymerization of p tert butyldimethylsilyloxystyrene and living trans 1,4 polymerization of 1,3 butadiene were catalyzed by 1, 4 dithiabutandiyl 2, 2' bis(6 cumenyl 4 methylphenoxy) titanium dichloride (complex 1) activated by methylaluminoxane (MAO) at room temperature to provide highly stereospecific isotactic poly(p tert butyldimethylsilyloxystyrene) (iP(p TBDMSOS) and 1,4 trans polybutadiene (1,4 trans PBD) with narrow molecular weight distribution. Furthermore, the iP(p TBDMSOS) b 1, 4 trans PBD was prepared via sequential monomer addition in the presence of complex 1 and MAO. The deprotection of the iP(p TBDMSOS) block was promoted by concentrated hydrochloric acid to produce iP(p HOS) b 1, 4 trans PBD. In addition, the resultant diblock copolymer and intermediate polymers were characterized by gel permeation chromatography, nuclear magnetic resonance and differential scanning calorimeter.

title: Self assembly of hydrogen bonded comb copolymer complexes of poly(p hydroxystyrene) and 4 alkylpyridine amphiphiles
abstract: The self assembly of the hydrogen bonded complexes between poly(p hydroxystyrene) (PpHS) and 4 alkylpyridine amphiphiles is studied using infrared spectroscopy, differential scanning calorimetry, polarized optical microscopy, transmission electron microscopy and small and wide angle X ray scattering. Interesting differences are observed with the well studied inverted system of poly(4 vinylpyridine) and alkylphenol amphiphiles. When the alkyl tails of the 4 alkylpyridine amphiphiles are long enough, 19 and 21 respectively, an ordered lamellar structure is formed on cooling where the ordering and crystallization of the alkyl tails occur quasi simultaneously. For a shorter alkyl tail of length 17 no ordered structure is formed. This is quite different from the inverted P4VP/alkylphenol systems, where already for an alkyl tail of length 15, i.e. pentadecylphenol, an ordered structure is formed below ca. 55 degC, followed by crystallization of the alkyl tails at ca. 20 degC. This can be attributed to the possibility of (intramolecular) hydrogen bond formation of PpHS.

title: Wavelength Dependence of Poly(p hydroxystyrene) Ablation by Mid Infrared Free Electron Laser

title: Synthesis and characterization of polymeric prodrug conjugate systems based on poly (p hydroxystyrene) In vitro hydrolysis behavior and antibacterial activity

title: Anionic Polymerization of para (1 Ethoxy ethoxy)styrene: Rapid Access to Poly(p hydroxystyrene) Copolymer Architectures
abstract: Living anionic polymerization of para (1 ethoxy ethoxy)styrene (pEES) resulting in molecular weights between 2700 and 69 000 g mol 1 and polydispersity indices =1.09 is introduced. PpEES can be used as a precursor for the synthesis of well defined poly(p hydroxystyrene) (PHS) architectures, enabling facile and rapid acidic deprotection at room temperature within a few minutes. In addition, a series of block copolymers containing pEES and 2 vinylpyridine (2VP) have been synthesized by anionic block copolymerization, with varied block ratios (X2VP) between 0.13 and 0.83. Characterization by 1H NMR spectroscopy, size exclusion chromatography (SEC) and differential scanning calorimetry (DSC) was carried out, and all polymers have been deprotected, leading to the respective PHS b P2VP block copolymers. Furthermore, PHS b P2VP has been used as a macroinitiator for the anionic ring opening polymerization of ethylene oxide (EO) to generate (PHS g PEO51)13 b P2VP40) graft block copolymers.

title: Second harmonic Generation Properties of Chromophore Functionallized Poly(p hydroxystyrene) Effect of in Situ Cross Linking on Second Harmonic Generation Temporal Charteristics, Molecular Electonics

title: Amphiphilic Polystyrene b poly(p hydroxystyrene g ethylene oxide) Block Graft Copolymers via a Combination of Conventional and Metal Free Anionic Polymerization
abstract: This work presents the synthesis of polystyrene block poly(p hydroxystyrene graft ethylene oxide) PS b (PHOS g PEO) amphiphilic block graft copolymers. The backbone diblock copolymers (PS b PHOS) were prepared by lithium based anionic polymerization, followed by postpolymerization acid hydrolysis of the poly(p tert butoxystyrene) PtBOS, precursor block. The PEO side chains were synthesized by metal free anionic ring opening polymerization of ethylene oxide (EO) using the phosphazene base (t BuP4) and the phenolic hydroxyl groups (PhOH) in the backbones as the complex multifunctional initiating system. In all cases, starlike block graft copolymers with high molecular weights and low polydispersities were synthesized. Well controlled polymerization was achieved even with the molar ratio of t BuP4 to PhOH being equal to 0.2. Dynamic and static light scattering and fluorescence spectroscopy studies were carried out to investigate the solution behavior of the amphiphilic block graft copolymers, including t.

title: Synthesis of Photo Scissible Poly(p hydroxystyrene) Derivatives by Radical Copolymerization of p Hydroxystyrene Derivatives and Methyl Vinyl Ketone
abstract: Poly(p hydroxystyrene) [poly(HSt) and its derivatives are well known as functional polymers and have been applied variously to photoresist materials, composites, a physical gel, and a pH responsive material. Therefore, it is expected that endowing poly(HSt) derivatives with photo scissibility will lead to the development of novel photosensitive functional materials. Recently, we have succeeded in the synthesis of photo scissible poly(HSt) derivatives by the incorporation of ketone groups into the main chain, which was conducted by radical copolymerization of O protected p hydroxystyrene (ROSt) and 2,2 diphenyl 4methylene 1,3 dioxorane (DPMD) (Scheme 1) DPMD can undergo the radical ring opening polymerization to afford the corresponding polyketone, which can be regarded as the copolymers of ethylene and carbon monoxide. Therefore, radical copolymerization of ROSt with DPMD and subsequent removal of protective groups gave the poly(HSt) derivatives having ketone groups in the main chain. The obtained poly(HSt) derivatives with ketone groups showed good photoscissibility based on Norrish type reactions.