摘要
合成了具有含不同量聚四亚甲基醚二醇(PTMG)的PTMG-PLA嵌段共聚物,并以IR,GPC,′H-NMR,和DSC进行了表征。通过应力-应变曲线研究了共聚物的力学性能。结果表明,共聚物的GPC曲线上只出现单一的流出体积峰,分子量分布多分散系数(?)_n/(?)_n小于2.0;另外,共聚物的T_g随其中的PTMG含量增加而降低,断裂伸长率随共聚物中PTMG含量的增加而增大,而应力,模量等力学性能则随共聚物中PTMG含量增加而降低。共聚物的体外降解速度较PLA均聚物的降解速度平缓。
Block copolymer form D,L-lactide and Poly (tetramethylene ether glycol) was synthesized and characterized by IR, GPC, ~1H-NMR and DSC. Mechanical properties were investigated by the measurements of stress-strain curves of copolymers. The resuits indicate that T_g and modulus of the copolymers decrease with the increase of PTMG weight percentage, and elongations at break of the copolymers show higher value when increasing PTMG weight percentage in the copolymers. In vitro degradation of the block copolymers was evaluated in 0.9% sodium chloride solution of water at 37℃. It is shown that the degradation of the copolymers is slower that of PLA.
出处
《功能高分子学报》
CAS
CSCD
1991年第2期133-138,共6页
Journal of Functional Polymers
基金
国家自然科学基金
关键词
PTMG
丙交脂
共聚
PLA
Hydrophobicity, Complexing Catalyst, Block copolymer
