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Effect of hydrogen bonding on the liquid crystalline behavior of Poly(p-phenylene terephthamide) in sulfuric acid
10.1016/j.polymer.2018.04.028 2018-04-10 Many factors affect the formation of lyotropic liquid crystals (LLCs) in the poly (p-phenylene terephthamide) (PPTA)/H2SO4 system. In this systematic work, we prove that the hydrogen bonding between PPTA and H2SO4 plays a very important role for the LLC forma... |
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Thermal transitions in semi-crystalline polymer thin films studied via spectral reflectance
10.1016/j.polymer.2018.04.017 2018-04-04 Herein we report the finding that spectral reflectance (SR) can be used to identify thermal transitions in semi-crystalline polymer thin films. By studying film thickness as a function of temperature, we found that semi-crystalline polymers exhibit characteri... |
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Chemical recycling of poly(bisphenol A carbonate): 1,5,7-Triazabicyclo[4.4.0]-dec-5-ene catalyzed alcoholysis for highly efficient bisphenol A and organic carbonate recovery
10.1016/j.polymer.2018.04.015 2018-04-04 Chemical degradation of poly (bisphenol A carbonate) is achieved using an easy-to-use organocatalyst, TBD (1,5,7-triazabicyclo [4.4.0]-dec-5-ene). Because of increased concern over bisphenol A (BPA) acting as a potent hormone disruptor, proper disposal of end... |
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Simultaneous WAXS/SAXS study on semi-crystalline Poly(ethylene furanoate) under uniaxial stretching
10.1016/j.polymer.2018.04.018 2018-04-04 A time-resolved study of uniaxial deformation processes of semi-crystalline poly (ethylene furanoate) (PEF) at 200 °C°C was carried out using synchrotron simultaneous wide- and small-angle X-ray scattering (WAXS/SAXS) techniques. The stretching was able to di... |
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Gallol-containing homopolymers and block copolymers: ROMP synthesis and gelation properties by metal-coordination and oxidation
10.1016/j.polymer.2018.04.016 2018-04-04 Gallol-functionalized polymers are highly desirable for their addressable functions in the fields of materials science, nanotechnology and biomedicine, owing to gallol's unique chemistry including excellent chelating properties to metals, easily oxidability a... |
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Trans-1,4- stereospecific copolymerization of isoprene and butadiene catalyzed by TiCl4/MgCl2 type Ziegler-Natta catalyst II. Copolymerization Kinetics and Mechanism
10.1016/j.polymer.2018.04.007 2018-04-03 Stereospecific copolymerization mechanism of isoprene (Ip) and butadiene (Bd) with heterogeneous TiCl4/MgCl2-Al(i-Bu)3 Ziegler-Natta catalyst was investigated for the first time in this paper. Copolymerization kinetics of isoprene and butadiene revealed that ... |
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Castor oil derived poly(urethane urea) networks with reprocessibility and enhanced mechanical properties
10.1016/j.polymer.2018.04.013 2018-04-03 Castor oil (CO) derived polyurethane networks exhibit poor mechanical properties and non-reprocessibility due to flexible, highly and permanently cross-linked network stuctures. To overcome these defects, we designed and fabricated a series of poly (urethane ... |
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Thermodynamics investigation of phase behavior of deep eutectic solvents-polymer aqueous biphasic systems
10.1016/j.polymer.2018.04.003 2018-04-03 Phase behavior including vapor-liquid and liquid-liquid equilibria of aqueous solutions of three deep eutectic solvents (DES), prepared by mixing of choline chloride as HBA, and urea, ethylene glycol and glycerol as HBD at a molar ratio of 1:2 (ChCl:2HBD), we... |
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Highly crosslinked and uniform thermoset epoxy microspheres: Preparation and toughening study
10.1016/j.polymer.2018.04.011 2018-04-03 A new type highly crosslinked and uniform thermoset epoxy microspheres (EMs) was prepared through the thermal curing between a trifunctional epoxy resin (TGPAP) and an aromatic amine hardener (DETDA), by precipitation polymerization in a low molecular weight ... |
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The effect of solvent to the kinetics of imidization of poly(amic acid)
10.1016/j.polymer.2018.04.005 2018-04-03 Kinetics of the imidization reaction of poly (amic acid) (PAA) film based on pyromellitic anhydride (PMDA) and 4,4′-diaminodiphenyl ether (ODA) was studied by infrared spectroscopy. Attention is paid to the effect of solvent content inside the sample to the r... |