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A series of poly(l-lactide) stereocopolymers with various optical purities (100%–88%) were synthesized by ring-opening copolymerization of the enantiomeric feedstock mixtures of l-lactide and D-lactide at 140 °C for 16 h under reduced pressure. The obtained relationship between microstructure and optical composition of poly(l-lactide) (PLLA) copolymers confirmed that the stannous octoate-catalyzed...
Morphologies of polymer networks are playing a key role in affecting the electro-optical (E-O) properties of a polymer dispersed liquid crystals (PDLCs) material. In this paper, the relationships between the polymer morphologies and the E-O properties of PDLCs are investigated in an unexplored thermally curing system based on epoxy/low-molar-mass-mercaptan. The polymer morphologies in this curing...
A series of biodegradable radiopaque iodinated poly(ester-urethane)s (IPEUs) were synthesized by chain-extension of dihydroxylated poly(butylene succinate) (PBS–OH) and isophorone diisocyanate (IPDI) with iodinated bisphenol-A (IBPA). The effects of IBPA on the crystallization and melting behaviour of IPEUs were investigated by wide-angle X-ray diffraction (WAXD), polarized optical microscope (POM),...
An endothermic annealing peak appears in DSC heating scans of cold-crystallized poly(l-lactic acid) after annealing above the cold-crystallization temperature. The annealing peak shifts to higher temperature and its magnitude increase with increasing annealing temperature or time. Furthermore, the origin of the annealing peak and microstructural changes of poly(l-lactic acid) were investigated by...
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