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...

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...

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...

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...

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...

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 ...

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 ...

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...

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 ...

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...