Investigation of X-ray Structure, Mechanical and Thermal Properties of Copoymers of L-Lactide and δ-Valerolactone
발표자
()
초록
내용
Biodegradable copolymers made of lactide (LA) and d-valerolactone (VL) in a variety of compositions were synthesized through bulk ring-expansion polymerization using tin(II) 2-ethylhexanoate as a catalyst and salicylic acid as an initiator. The effect of different VL compositions (30, 40, 50, 60, and 70 mole ratios) on the tensile properties and thermal stability of the copolymers, poly(LA-co-VL)s were investigated. The influence of monomer compositions on the crystallite size and lamellar structure of poly(LA-co-VL)s were investigated by SAXS and WAXD, respectively. The crystallization behavior of the annealed poly(LA-co-VL)s were compared with those of PLA homopolymer via synchrotron WAXS measurement in a wide range of temperatures. It was found that increasing the VL composition of poly(LA-co-VL)s led to the increase of elongation at break and thermal stability. The SAXS and WAXD data demonstrated that the amorphous and crystalline orientation of poly(LA-co-VL)s was varied with monomer composition.