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The effects of copolymer composition on structure development in injection molded bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBHV) parts were investigated. The increase of hydroxyvalerate co-monomer content lowers the melting temperature as it disrupts the crystalline order as a result, depth variation of melting behavior in the injection molded samples were found to depend primarily...
The crystals of polyphenylsilsesquioxane (PPSQ) and isotactic polystyrene (i-PS) blends prepared from their toluene solutions had been studied by optical polarized microscope and DSC. Some big bright regular parallelogram-like single crystals from PPSQ with coarse surface are observed (PPSQ≥90%) and no regular crystals could be formed (PPSQ≤70%), however, at PPSQ≤10%, this blend formed irregular continuous...
Structural ordering from the α1 to the α2 phase of isotactic polypropylene has been investigated. The DSC studies showed that reorganization or recrystallization occurred in the wide endothermic region. In the high-temperature X-ray experiment of the sample annealed at 135 o C, the 231 and 161 reflections ascribed to the α2 phase began to increase from 160 o C and to decrease above...
Physical aging of polystyrene (PS) in the glassy state was investigated by dynamic viscoelasticity measurements. Two kinds of PS sample (T g =110°C), almost equal in weight-average molecular weight but different in molecular weight distribution, were used. Physical aging was observed for the samples aged at 60 and 80°C after having been quenched from 190°C. The physical aging was not affected...
Poly(phenylacetylene) and polystyrene which contain galvinoxyl and trimethylsilyl units were synthesized by copolymerization of the corresponding monomers or polymer reaction of the corresponding methyl benzoate polymers with [3,5-di-tert-butyl-4-(trimethylsiloxy)phenyl]lithium. The copolymers obtained from (4-trimethylsilyl)phenylacetylene and (4-ethynylphenyl)hydrogalvinoxyl using [Rh(norbornadiene)Cl]...
For the first time, formation of single crystals of ladderlike polyphenylsilsesquioxane (PPSQ) is found from three kinds of solution (benzene, toluene or p-xylene) at different temperatures (room temperature, 55, 65, 75, 80, 85 or 100 o C) for some time (from 10min to 257h). Crystallization conditions, such as temperature, time and solvent, have a great effect on number, size and shapes of...
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