bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polyphenols assisted silica coating on polypropylene separators with improved wettability and heat‐resistance for lithium‐ion batteries
Authors: Yuan Jia‐Jia , Song You‐Zhi , Zhang Yin , Qiu Ze‐Lin , Sun Chuang‐Chao , Yin Xue , Zhu Li‐Ping , Zhu Bao‐Ku 
Published: November 2018

ABSTRACTThe separator, as one of the essential components for lithium‐ion batteries (LIBs), has garnered considerable attention because of its significant role in battery performance. Here, an in‐situ coating method to promote the wettability and thermal‐stability of polypropylene (PP) separators was reported. The separator was first dip‐coated with phenolic compound based on biologically inspired surface modification. Then silica layers were in‐situ formed on the separator via a sol–gel process of silicate solution, so that an inorganic–organic hybrid layer was coated on PP separators without the need of any polymer binders. Besides, this method hardly increases the film thickness or sacrifices microporous structure of the pristine separator. Due to the introduction of hybrid layers, the resulted separators showed excellent dimensional thermostability, as the thermal shrinkage was only 20% at 150 °C while that of the bare separator was about 80%. Meanwhile, electrochemical performances of cells with the modified separator were obviously improved, especially the rate performance. At the charge/discharge current density of 5 C, cells with PP separators nearly lost all the capacity, but the modified separator still held 45.7% of the discharge capacity at 0.2 C. This facile yet effective method has great application prospects in the preparation of ceramic‐coated separators. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 47277.
A novel cyclic copolymer containing Si/P/N used as flame retardant and water repellent agent on cotton fabrics
Authors: Wei Dongdong , Dong Chaohong , Chen Zhaohua , Liu Jian , Li Qun , Lu Zhou 
Published: November 2018

ABSTRACTA novel cyclic‐shaped multifunctional copolymer named poly[tetra(tetramethylcyclosiloxyl‐piperazin)‐phosphinic acid methyl ether] (PNCTSi) was successfully synthesized. Its flame‐retardant and hydrophobicity properties on cotton fabrics were investigated. The limited oxygen index (LOI) value of treated cotton fabrics with PNCTSi was up to 29.8%. By vertical burning test, it was found that the treated cotton fabrics have no after‐flame and no after‐glow. Apparently, more amounts of char were generated and hazardous volatiles distinctly reduce after combustion by thermogravimetric analysis. Besides, Treated cotton fabrics with PNCTSi can give a hydrophobic property, which reach a contact angle of 150°. The surface morphology of treated cotton fabric before and after combustion was analyzed by scanning electron microscopy, after burned, the surface morphology of cotton fiber exhibited more smooth and expanded feature. After washing the cotton fabric for 20 times, the LOI remains at above of 26.0%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47280.
Structural, mechanical, and antibacterial features of curcumin/polyurethane nanocomposites
Authors: Marković Zoran , Kováčová Mária , Mičušík Matej , Danko Martin , Švajdlenková Helena , Kleinová Angela , Humpolíček Petr , Lehocký Marián , Marković Biljana Todorović , Špitalský Zdeno 
Published: November 2018

ABSTRACTVarious types of bacteria inhabit many surfaces thus causing problems which can have very strong impact on human health. Here we present a study of photophysical, mechanical, and antibacterial properties of curcumin/polyurethane nanocomposites prepared by swell‐encapsulation‐shrink method. The prepared nanocomposites have been characterized for degree of swelling, surface morphology, mechanical properties, chemical contents, photoluminescence, hydrophobicity, potentials for singlet oxygen generation, and antibacterial activity. Dynamic mechanical analysis has shown slight changes of glass temperature of curcumin/polyurethane nanocomposites due to blue light irradiation. It was found that nanocomposites have very strong photoluminescence, become photoactive upon blue light irradiation at 470 nm and generate singlet oxygen. Conducted antibacterial tests have shown very strong activity of these nanocomposites especially toward Escherichia coli. These bacteria strains have been eliminated completely only after 1 h irradiation by blue light. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47283.
Influence of co‐monomer‐type and amount on thermomechanical properties of ultrafast‐curing acrylic resins using a triacrylic crosslinker
Authors: Böhm Michael , Ruhland Klaus , Koch Marius , Spalek Niclas 
Published: November 2018

ABSTRACTAn ultrafast ultraviolet‐light‐cured acrylic resin was developed. The monoacrylic monomers ethylene‐glycol‐phenyl‐ether acrylate (EGPEA), 2‐hydroxy‐3‐phenoxypropyl acrylate (HPPA), di(ethyleneglycol)‐ethyl‐ether acrylate (DEGEEA), or poly(ethyleneglycol)‐phenyl‐ether acrylate (PolyEGPEA) were each mixed with varying amounts of the triacrylic crosslinker tris[2‐(acryloyloxy)ethyl] isocyanurate (ICTA). The curing time was 1 s at room temperature (average degrees of curing between 55 and 85%). The specimens of ICTA‐EGPEA showed a maximum tensile strength of 76.0 ± 1.4 MPa, an E‐modulus of 4216 ± 188 MPa, an elongation at break of 2.3 ± 0.1%, and a glass transition temperature (T
g) of 100 °C. The development of properties with increasing amount of crosslinker could be well described on the basis of percolation theory. Below the percolation threshold the behavior is dominated by the auxiliary co‐monomer. Above the percolation threshold the behavior is dominated by ICTA. On exchanging EGPEA by HPPA, the influence of hydrogen bonding on the thermomechanical properties was extracted. Exchanging EGPEA by DEGEEA or PolyEGPEA allowed for exploring the influence of beta‐relaxation of the monoacrylic monomers on the thermomechanical properties of the resin. Large ester side‐groups reduced the tensile strength, the E‐modulus, and the T
g decisively. The impact strength in turn was decisively increased using PolyEGPEA as auxiliary co‐monomer. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47294.
Enhancement of drawdown force in polypropylene containing nucleating agent
Authors: Phulkerd Panitha , Nakabayashi Takehiro , Iwasaki Shohei , Yamaguchi Masayuki 
Published: November 2018

ABSTRACTThe effect of the nucleation efficiency of three commercial nucleating agents, such as 1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS), sodium 2,2′‐methylene‐bis‐(4,6‐di‐tert‐butylphenyl)phosphate (SMBP), and magnesium silicate (talc), on the melt‐stretching performance of isotactic polypropylene (PP) is studied. It is found that the addition of 0.5 wt % of a nucleating agent enhances the crystallization temperature and that effect is pronounced for DMDBS and SMBP. Furthermore, DMDBS is more efficient than the other tested nucleating agents in enhancing the drawdown force, defined as a force required for stretching a molten strand. Nanofibers of DMDBS, which show significant alignment in the flow direction, are responsible for the rapid crystallization of PP in the flow field leading to an increase of drawdown force. The stretched strand shows a highly oriented structure in which the α‐form crystals orient to the flow direction. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47295.
Utilization of different tall oils for improving the water resistance of cellulosic fibers
Authors: Hosseinpourpia Reza , Adamopoulos Stergios , Parsland Charlotte 
Published: November 2018

ABSTRACTThis study was conducted to assess the effect of the pulping by‐products crude tall oil (CTO), distilled tall oil (DTO), and tall oil fatty acid (TOFA) on dynamic water vapor sorption behavior, interfiber strength, and thermal stability of cellulosic paper‐sheets. The results were compared against those obtained in cellulose papers treated with the conventional petroleum‐derived hydrophobic agent hydrowax and in untreated ones. The tall oil treatments caused strong reduction in equilibrium moisture content of the paper‐sheets during adsorption and desorption runs. The same trend was noticed for the hydrowax‐treated papers, however, it was less pronounced than the CTO‐treated and DTO‐treated samples in the relative humidity range of 75–95%. The sorption hysteresis was considerably decreased after the treatments. The ultimate dry‐tensile strengths of the paper‐sheets were significantly reduced by TOFA and hydrowax treatments, while CTO and DTO showed comparable strength as that of untreated control. The ultimate wet‐strengths of the paper‐sheets were improved after the treatments. The thermal stability of the specimens was improved by the tall oil treatments, and the hydrowax‐treated samples illustrated lower degradation temperature than the untreated control. The results are promising for the use of tall oils as alternative hydrophobic agents of cellulosic fiber‐based products, such as wood panels and paper packaging. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47303.
Polydimethylsiloxane–PbZr0.52Ti0.48O3 nanocomposites with high permittivity: Effect of poling and temperature on dielectric properties
Authors: Nayak Suryakanta , Khastgir Dipak 
Published: November 2018

ABSTRACTPolydimethylsiloxane (PDMS)/lead zirconate titanate (PbZr0.52Ti0.48O3, PZT)‐based nanocomposites with high dielectric constant (permittivity, k) are prepared through room temperature mixing. The effect of PZT loading on electrical and mechanical properties of the PDMS–PZT composites is extensively studied. It is found that there is significant increase in permittivity with PZT loading and decrease in volume resistivity. All the composites have low dielectric loss compared to permittivity value. It is observed that there is increase in permittivity and decrease in volume resistivity of composites after poling, which is due to the dipolar polarization. It is found that both permittivity (ε′) and alternating current conductivity (σac) are increased with temperature at low frequency (1 Hz) and decreased with temperature at high frequency (1 MHz). The above composites are sensitive to external pressure and can be used as pressure/force sensor. The tensile strength and % elongation at break decreases with PZT loading, which is due to the nonreinforcing behavior of PZT ceramic. PZT particles distribution and dispersion in PDMS matrix are observed through field emission scanning electron microscopy, high resolution transmission electron microscopy, and atomic force microscopy/scanning probe microscopy. Thermal stability of composites increased with the PZT loading which is due to higher thermal stability of PZT particles compared to PDMS matrix. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47307.
Heat resistance of acrylic pressure‐sensitive adhesives based on commercial curing agents and UV/heat curing systems
Authors: Zhang Xiaoyong , He Jinmei , Yue Lipei , Bai Yongping , Liu Huihui 
Published: November 2018

ABSTRACTThe development of adhesive tapes that can be applied at high temperature is a major challenge for pressure‐sensitive adhesives (PSAs). To date, the heat resistance of PSAs has not been investigated in sufficient details. In this study, based on the relationship between curing structures and properties, a series of acrylic PSAs with excellent heat resistance were prepared. Commercial zirconium acetylacetonate (ZrACA), desmodur L75 (L75), and N,N,N′,N′‐tetrakis(2,3‐epoxypropyl)‐m‐xylene‐α,α′‐diamine (GA240) were employed as heat‐curing agents. Trimethylolpropane triacrylate (TMPTA) was used as ultraviolet (UV)‐curing agent to form semi‐interpenetration polymer network structures after UV exposure. The influences of different curing agents on the thermal stability, adhesion performance, gel fraction, and viscoelastic of PSAs were explored. The results showed that the PSAs cured by L75, GA240, and TMPTA exhibited excellent heat resistance. Especially, when the content of L75 was 1.0 wt %, the PSAs could be peeled off substrate without residues on substrate surface after treatment at 170 °C for 4 h, while the nonmodified acrylic PSAs possessed residues after treatment from 110 °C. The cured PSAs adhesive performance was evaluated showing maximum 180° peel strength of 16.7 N/25 mm comparable to current PSAs. These resulting PSAs showed high heat resistance and they are suitable for a broad range of special fields. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47310.
Preparation and adsorption mechanism of polyvinyl alcohol/graphene oxide‐sodium alginate nanocomposite hydrogel with high Pb(II) adsorption capacity
Authors: Yu Yaru , Zhang Ge , Ye Lin 
Published: November 2018

ABSTRACTA series of polyvinyl alcohol (PVA)/graphene oxide (GO)‐sodium alginate (SA) nanocomposite hydrogel beads were prepared through in situ crosslinking for Pb2+ removal. It was found that PVA and SA molecules were intercalated into GO layers through hydrogen bonding interactions, leading to the destruction of orderly structure of GO, while GO uniformly distributed in PVA matrix. With increasing PVA solution concentration, the hydrogel beads became more regular, a large number of polygonal pores with thin walls and open pores formed, the average pore size decreased, and the dense network structure formed. Meanwhile, the permeability of the composite hydrogel decreased, leading to the decline of Pb2+ adsorption capacity of the composite hydrogel. With increasing GO content, the ballability of the hydrogel beads was weakened, the pore size increased, and relatively loose network structure formed, resulting in an increase in permeability and Pb2+ adsorption capacity of the hydrogel, reaching up to 279.43 mg g−1. Moreover, the composite hydrogel presented relatively good reusability for Pb2+ removal. The adsorption mechanism was explored and showed that the adsorption system of the composite hydrogel belonged to the second‐order kinetic model and fitted Langmuir adsorption isotherm model for Pb2+ removal, which might be mono‐layer chemical adsorption. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47318.
Synthesis, characterization, and mechanical performance of various functionalized carbon nanotubes‐polyurethanes nanocomposites
Authors: Antolín‐Cerón Víctor Hugo , Nuño‐Donlucas Sergio Manuel , Barrera‐Rivera Karla Alejandra , Martínez‐Richa Antonio 
Published: November 2018

ABSTRACTNanocomposites of functionalized carbon nanotubes (CNTsf) used as a reinforcement agent, and a polyurethane (PU), as a polymeric matrix were synthesized via in situ polymerization. Carbon nanotubes (CNTs) were chemically functionalized using four different chemical treatments to obtain (1) oxidized CNTs (CNTsOH, COOH), (2) CNTs containing aliphatic amine groups (CNTset diam), (3) CNTs attached to an aromatic amine group (CNTs4AB), and (4) CNTs containing a combination of aromatic amine, hydroxyl, and carboxyl functional groups (CNTs4AB, OH, COOH). The nanocomposites (prepared using 0.25, 0.5 or 1.0 wt % CNTsf) were synthesized by two processes: (1) one‐step using a PU made from PCL‐diol (α‐ω‐telechelic polyester diol) obtained by biocatalysis from ε‐caprolactone (ε‐CL) and diethylene glycol (DEG) and 4,4′‐methylenebis (cyclohexyl isocyanate) (H12MDI) in stoichiometric amounts, (2) two‐step process (chain extended PU) using hexamethylene diamine (HMDA). Depending on the chemical route used to synthesized the nanocomposites, CNTsf form, in some cases, covalent bonds and hydrogen bonding with the soft and/or hard segments of the PU matrix. Also, the presence of CNTsf improves the thermal stability of the nanocomposites and some of their mechanical properties, compared to the pure PU properties. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47319.
Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface
Authors: Samide Adriana , Brătulescu George , Merişanu Claudia , Cioateră Nicoleta 
Published: November 2018

ABSTRACTThe poly(vinyl acetate) (PVAC) film was obtained by electropolymerization on the copper electrode using cyclic voltammetry performed in mixed electrolyte based on water/ethyl alcohol/acetic acid containing vinyl acetate (VAc) and benzoyl peroxide as polymerization initiator. The coatings were characterized by optical microscopy, scanning electron microscopy (SEM) and infrared (IR) spectroscopy. The corrosion was induced in hydrochloric acid solution using potentiodynamic measurements and electrochemical impedance spectroscopy (EIS). The microscopic and SEM images revealed the PVAC coating formation and IR spectroscopy confirmed that it exhibits the same characteristic bands as a standard PVAC sample. From the potentiodynamic polarization, the PVAC protective performance of 78% was computed. The EIS measurements showed the occurrence of the surface adsorbed layer with a higher impedance response to the frequency and a phase angle maximum shifted to lower values than those of uncoated samples. In addition, the VAc electropolymerization mechanism was discussed and the PVAC adsorption mechanism on the copper surface was proposed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47320.
Role of chain extension in the rheological properties, crystallization behaviors, and microcellular foaming performances of poly (butylene adipate‐co‐terephthalate)
Authors: Song Jingsi , Zhou Hongfu , Wang Xiangdong , Zhang Yuxia , Mi Jianguo 
Published: November 2018

ABSTRACTCurrently, the fabrication of microcellular semicrystalline polymer foam using supercritical CO2as a blowing agent constitutes a worldwide interest. In this work, a facile approach of chain extension and batch foaming was proposed to prepare microcellular semicrystalline poly (butylene adipate‐co‐terephthalate) (PBAT) foam using CO2as a physical blowing agent. With the introduction of chain extender (CE), the weight‐average molecular weight and gel fraction of PBAT samples increased; their crystallization temperature increased from 74.2 to 86.9 °C and their viscoelasticity was improved greatly. Microcellular PBAT foams with the cell size <4 μm and the cell density more than 1010cells cm−3were fabricated successfully. With increasing concentration of CE, the cell density and volume expansion ratio (VER) of various PBAT foams increased from 3.4 × 1010to 8.7 × 1010cells cm−3and from 1.5 to 2.0 times, respectively. With increasing foaming temperature, the cell size and VER increased and the cell density decreased. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 47322.
Effect of injection speed on the mechanical properties of isotactic polypropylene micro injection molded parts based on a nanoindentation test
Authors: Wang Lixia , Zhang Yang , Jiang Lin , Yang Xuecheng , Zhou Yiping , Wang Xiaoyu , Li Qian , Shen Changyu , Turng Lih‐Sheng 
Published: November 2018

ABSTRACTIsotactic polypropylene micro parts were molded at different injection speeds by microinjection molding. The morphology and micro structure were characterized by a polarizing microscope, and the mechanical properties of differently structured layers were characterized by nanoindentation experiments. The influence of injection speed on the nanoindentation mechanical properties of each structural layer of the micro parts was analyzed. The results showed that the mechanical properties of different layers were different, the modulus and hardness of the position near the core layer were largest, and the modulus and hardness of the position near the skin were smallest. It is compelling that the modulus and hardness of each layer decreased first and then increased as the injection speed increased under a higher melt temperature (240 °C). Meanwhile, the opposite trend was observed at a lower melt temperature (220 °C). This phenomenon can be attributed to the competitive mechanism of the shear heat effect and the disorientation effect. In addition, injection speed had a greater influence on the nanoindentation mechanical properties in the perpendicular direction than in the flow direction. This work systematically explored the relationship between the microstructure and the local mechanical properties, which can provide new insights for microinjection molding design in the future. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47329.
Suramin, screened from an approved drug library, inhibits HuR functions and attenuates malignant phenotype of oral cancer cells
Authors: Kakuguchi Wataru , Nomura Takao , Kitamura Tetsuya , Otsuguro Satoko , Matsushita Kazuhiro , Sakaitani Masahiro , Maenaka Katsumi , Tei Kanchu 
Published: November 2018

AbstractAU‐rich elements (ARE) exist in the 3′‐untranslated regions of the mRNA transcribed from cell growth‐related genes such as proto‐oncogenes, cyclin‐related genes, and growth factors. HuR binds and stabilizes ARE‐mRNA. HuR is expressed abundantly in cancer cells and related malignant phenotypes. HuR knockdown attenuates the malignant phenotype of oral cancer cells. In this study, we screened 1570 compounds in the approved drug library by differential scanning fluorimetry (DSF) to discover a HuR‐targeted compound. Firstly, 55 compounds were selected by DSF. Then, 8 compounds that showed a shift in the melting temperature value in a concentration‐dependent manner were selected by DSF. Of them, suramin, an anti‐trypanosomal drug, binds to HuR, exhibiting fast‐on and fast‐off kinetic behavior on surface plasmon resonance (SPR). We confirmed that suramin significantly decreased mRNA and protein expression of cyclin A2 and cyclin B1. The cyclin A2 and cyclin B1 mRNAs were destabilized by suramin. Furthermore, the motile and invasive activities of a tongue carcinoma cell line treated with suramin were markedly lower than those of control cells. The above findings suggest that suramin binds to HuR and inhibits its function. We also showed that the anticancer effects of suramin were caused by the inhibition of HuR function, indicating its potential as a novel therapeutic agent in the treatment of oral cancer. Our results suggest that suramin, via its different mechanism, may effectively suppress progressive oral cancer that cannot be controlled using other anticancer agents.
Abemaciclib Inhibits Renal Tubular Secretion Without Changing Glomerular Filtration Rate
Authors: Chappell Jill C. , Turner P. Kellie , Pak Y. Anne , Bacon James , Chiang Alan Y. , Royalty Jane , Hall Stephen D. , Kulanthaivel Palaniappan , Bonventre Joseph V. 
Published: November 2018

Abemaciclib, an inhibitor of cyclin dependent kinases 4 and 6, is indicated for metastatic breast cancer treatment. Reversible increases in serum creatinine levels of ~15–40% over baseline have been observed following abemaciclib dosing. This study assessed the in vitro and clinical inhibition of renal transporters by abemaciclib and its metabolites using metformin (a clinically relevant transporter substrate), in a clinical study that quantified glomerular filtration and iohexol clearance. In vitro, abemaciclib inhibited metformin uptake by organic cation transporter 2, multidrug and toxin extrusion (MATE)1, and MATE2‐K transporters with a half‐maximal inhibitory concentration of 0.4–3.8 μM. Clinically, abemaciclib significantly increased metformin exposure but did not significantly affect measured glomerular filtration rate, serum neutrophil gelatinase‐associated lipocalin (NGAL), serum cystatin‐C, or the urinary markers of kidney tubular injury, NGAL and kidney injury molecule‐1.