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You searched for: Journal Journal of polymer science Remove constraint Journal: Journal of polymer science Source 2019 v.57 no.10 Remove constraint Source: 2019 v.57 no.10
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1. Directed motion of a polyelectrolyte micelle along tethered chains of oppositely charged polyelectrolyte brush

Author:
Miliou, Kalliopi; Gergidis, Leonidas N.; Vlahos, Costas
Source:
Journal of polymer science 2019 v.57 no.10 pp. 621-631
ISSN:
0887-6266
Subject:
composite polymers; electrolytes; hydrophilicity; micelles; molecular dynamics; simulation models
Abstract:
... The complexation of different single polyelectrolyte (PE) micelles formed by linear diblock copolymers with oppositely charged brushes with varying grafting densities and charge content was studied by means of molecular dynamics simulations using the primitive model. We found that all micelles perform a directed motion along the vertical z axis on the grafted surface where they trapped while on th ...
DOI:
10.1002/polb.24818

2. Enhanced dielectric performance and energy storage of PVDF‐HFP‐based composites induced by surface charged Al2O3

Author:
Li, Jialong; Yin, Jinghua; Yang, Chen; Li, Na; Feng, Yu; Liu, Yuanyuan; Zhao, He; Li, Yanpeng; Zhu, Congcong; Yue, Dong; Su, Bo; Liu, Xiaoxu
Source:
Journal of polymer science 2019 v.57 no.10 pp. 574-583
ISSN:
0887-6266
Subject:
aluminum oxide; dielectric properties; electric field; energy; gases; mixing; nanoparticles; polymers; propylene
Abstract:
... In order to enhance dielectric properties and energy storage density of poly(vinylidene fluoride‐hexafluoro propylene) (PVDF‐HFP), surface charged gas‐phase Al₂O₃ nanoparticles (GP‐Al₂O₃, with positive surface charges, ε’ ≈ 10) are selected as fillers to fabricate PVDF‐HFP‐based composites via simple physical blending and hot‐molding techniques. The results show that GP‐Al₂O₃ are dispersed homogen ...
DOI:
10.1002/polb.24814

3. Insight into shear‐induced modification for improving processability of polymers: Effect of shear rate on the evolution of entanglement state

Author:
Fu, Jiaxin; Wang, Yingxiong; Shen, Kaizhi; Fu, Qiang; Zhang, Jie
Source:
Journal of polymer science 2019 v.57 no.10 pp. 598-606
ISSN:
0887-6266
Subject:
crystallization; molecular weight; polyethylene; rheometers; viscosity
Abstract:
... Many experimental results have revealed that the re‐entanglement kinetics of disentangled polymers is much slower than that predicted by tube theory. This retarded recovery of fully entangled state is of practical significance that shear‐induced modification may offer a way to improve processability for a polymer by reducing viscosity. This work tried to figure out the shear‐rate dependence variat ...
DOI:
10.1002/polb.24816

4. Nascent particle sizes and degrees of entanglement are responsible for the significant differences in impact strength of ultrahigh molecular weight polyethylene

Author:
Zhang, Huan; Zhao, Shicheng; Yu, Xin; Xin, Zhong; Ye, Chunlin; Li, Zhi; Xia, Jincheng
Source:
Journal of polymer science 2019 v.57 no.10 pp. 632-641
ISSN:
0887-6266
Subject:
Raman spectroscopy; crystal structure; differential scanning calorimetry; impact strength; industrial applications; molecular weight; particle size; polyethylene; rheological properties; rheometers; scanning electron microscopy; thermal properties
Abstract:
... The physical properties of ultrahigh molecular weight polyethylene (UHMWPE) are generally highly dependent on its molecular weight. However, in our study, it was found that two UHMWPE samples of similar molecular weight, SLL‐5 and GUR 4150, have significantly different impact strengths, with the Charpy impact strength of GUR 4150 being almost 3.4 times that of SLL‐5. To reveal the reasons, the str ...
DOI:
10.1002/polb.24819

5. Structural origin for the strain rate dependence of mechanical response of fluoroelastomer F2314

Author:
Chang, Jiarui; Lin, Yuanfei; Chen, Wei; Tian, Fucheng; Chen, Pinzhang; Zhao, Jingyun; Li, Liangbin
Source:
Journal of polymer science 2019 v.57 no.10 pp. 607-620
ISSN:
0887-6266
Subject:
crystallization; crystals; deformation; energy; mechanical properties; polymers; wide-angle X-ray scattering
Abstract:
... The structural evolution of fluoroelastomer F2314 is studied during uniaxial tensile in a large strain rate range (0.1–150 s⁻¹) with the combination of a homemade high‐speed stretching device and in situ small‐ and wide‐angle X‐ray scattering techniques. Based on the mechanical behaviors and structural evolutions, three strain rate regions (I–III) are defined. The microphase‐separated structure pl ...
DOI:
10.1002/polb.24817

6. Synthesis and mechanical properties of para‐aramid nanofibers

Author:
Trexler, Morgana M.; Hoffman, Christopher; Smith, Douglas A.; Montalbano, Timothy J.; Yeager, Matthew P.; Trigg, Douglas; Nimer, Salahudin; Calderón‐Colón, Xiomara; Peitsch, Christopher; Xia, Zhiyong
Source:
Journal of polymer science 2019 v.57 no.10 pp. 563-573
ISSN:
0887-6266
Subject:
anisotropy; chemical reactions; hydrogen bonding; molecular weight; nanofibers; polymers; relative humidity; scanning electron microscopes; scanning electron microscopy; solvents; spinning; synthesis; tensile strength
Abstract:
... Scalable, bottom‐up chemical synthesis and electrospinning of novel Cl‐substituted poly(para‐phenylene terephthalamide) (PPTA) nanofibers are herein reported. To achieve Cl‐PPTA nanofibers, the chemical reaction between the monomers was precisely controlled, and dissolution of the polymer into solvent was tailored to enable anisotropic solution formation and sufficient entanglement molecular weigh ...
DOI:
10.1002/polb.24810

7. Water structure and mobility in acrylamide copolymer glycohydrogels with galactose and siloxane pendant groups

Author:
Fogel, April L.; Ravichandran, Ashwin; Mani, Sriramvignesh; Upadhyay, Bishal; Khare, Rajesh; Morgan, Sarah E.
Source:
Journal of polymer science 2019 v.57 no.10 pp. 584-597
ISSN:
0887-6266
Subject:
acrylamides; composite polymers; differential scanning calorimetry; dynamic vapor sorption method; galactose; hydrogels; hydrogen bonding; hydrophobicity; molecular dynamics; nuclear magnetic resonance spectroscopy; silane; simulation models; surfactants; thermogravimetry; water content
Abstract:
... Glycohydrogels containing 2′‐acrylamidoethyl‐β‐d‐galactopyranoside and varying levels of N,N′ methylene bisacrylamide and 3‐acrylamidopropyltris(trimethylsiloxy)silane were synthesized to determine the effects of crosslinker and amphipathic balance on equilibrium water content (EWC), bound water population, and hydrogen bonding dynamics at the water–polymer interface. Analogous dimethylacrylamide ...
DOI:
10.1002/polb.24815