摘要
通过使用端羟基PEG作为引发剂,制备了PLA-PEG-PLA三嵌段共聚物,并在CHCl3溶液中通过OCN-PEG-NCO作为扩链剂对不同PEG含量的三嵌段共聚物进一步扩链,从而通过两步法合成了分子量可控的多嵌段共聚物.通过FTIR证明了反应过程中,NCO基团和OH基团间发生了反应,最终制备了多嵌段的共聚物.DSC曲线表明,随着PEG含量的增加,材料的Tg大幅下降了26.5℃,同时冷结晶温度和熔点也都出现了降低,热稳定性基本不变.
In attempts to modify the intrinsic properties of PLA, the PLA-PEG-PI.A multiblocks copolymers were synthesized by ring opening polymerization of L-lactide, initiated by the hydroxyl terminal groups of the PEG chain, followed by using OCN-PEG-NCO in absolute chloroform solvent. Various analytical techniques such as FTIR, DSC were used to characterize the structure of the copolymer. According to that it is in ferred that PLA/PEG multiblock copolymers are synthesized, and the Tg descends through 26.5℃with the increase of PEG content, thermal stability keeps invariant.
出处
《中原工学院学报》
CAS
2009年第5期13-17,共5页
Journal of Zhongyuan University of Technology
基金
河南省高校杰出科研人才创新工程项目(2006KYCX009)
