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The crystalline morphologies of high-density polyethylene (HDPE) molded by multi-melt multi-injection molding (MMMIM) and conventional injection molding (CIM) were studied by employing polarizing light microscopy (PLM) and scanning electronic microscopy (SEM). It was found that a special double skin-core structure was formed in MMMIM parts. Namely cylindritic structures appeared in both sub-skin layer...
Copolyester was synthesized and characterized as having 94.4mol% ethylene succinate units and 5.6mol% trimethylene succinate units in a random sequence as revealed by NMR. Differential scanning calorimeter (DSC) was used to investigate the isothermal crystallization kinetics of this copolyester in the temperature range (T c ) from 30 to 80°C. The melting behavior after isothermal crystallization...
Polysulfone based on bisphenol A has been extensively used as a material for membrane-based gas separation. For polymers with aromatic rings in their backbones, such as polysulfones and polyimides, changing the connecting bond positions from meta to para seems to increase their permeability and diffusivity to gases. Cavity size distributions of three isomer pairs (PSF and 3,4′-PSF, PSF-P and PSF-M,...
Two very permeable polymers, poly(1-trimethylsilyl-1-propyne) (PTMSP) and a random copolymer of tetrafluoroethylene and 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole (TFE/BDD), have very similar and large fractional free volumes (FFV), but very different permeabilities. Using atomistic models, cavity size (free volume) distributions determined by a combination of molecular dynamic and Monte Carlo...
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