摘要
以辛酸亚锡为催化剂,1,4-丁二醇为引发剂,将ε-己内酯与DL-丙交酯进行开环聚合制备两端带有羟基的ε-己内酯和DL-丙交酯共聚物(PCDLA-OH预聚物),然后以PCDLA-OH预聚物引发L-丙交酯开环聚合制备两端为聚L-丙交酯链段,中间为ε-己内酯和DL-丙交酯共聚物链段的三嵌段共聚物(PLLA-b-PCDLA-b-PLLA),并对嵌段共聚物的结构与性能进行了测试。结果表明,PCDLA-OH预聚物中DL-丙交酯的用量越大,预聚物逐渐从部分结晶转变为无定形聚合物,玻璃化转变温度逐渐升高。当DL-丙交酯与ε-己内酯的摩尔比为3/10,PCDLA-OH预聚物与L-丙交酯的质量比为1/5时,所制备的PLLA-b-PCDLA-b-PLLA的扯断伸长率为204%,拉伸强度为4.77 MPa。
Using stannous octanoate as catalyst and 1,4-butanediol as initiator,ring-opening polymerization ofε-caprolactone and DL-lactide was carried out to prepareε-caprolactone and DL-lactide copolymer with hydroxyl groups at both ends(PCDLA-OH prepolymer),and then L-lactide ring-opening polymerization was initiated by PCDLA-OH prepolymer to prepare triblock copolymer with poly L-lactide segments at both ends andε-caprolactone and DL-lactide copolymer in the middle(PLLA-b-PCDLA-b-PLLA)was prepared,and the structure and properties of the block copolymer were tested.The results showed that the larger the amount of DL-lactide in PCDLA-OH prepolymer,the prepolymer gradually changed from partial crystallization to amorphous polymer,and the glass transition tempe-rature gradually increased.When the mole ratio of DL-lactide toε-caprolactone was 3/10 and the mass ratio of PCDLA-OH prepolymer to L-lactide was 1/5,the elongation at break and tensile strength of the prepared PLLA-b-PCDLA-b-PLLA were 204%and 4.77 MPa.
作者
李世红
吴君飞
金玉顺
伍一波
连慧琴
LI Shi-hong;WU Jun-fei;JIN Yu-shun;WU Yi-bo;LIAN Hui-qin(School of New Materials and Chemical Engineering/Beijing Key Laboratory of Special Elastomeric Composite Materials,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《合成橡胶工业》
CAS
北大核心
2022年第5期351-356,共6页
China Synthetic Rubber Industry
基金
北京市大学生科研训练项目(2019 J 00016)。
