摘要
为获得性能优异的生物降解高分子材料,应用1,8-二氮杂二环[5.4.0]十一碳-7-烯(DBU)/碘化锂(Li I)双催化体系,以苯甲醇(BnOH)为引发剂,协同催化单体ε-己内酯(ε-CL)开环聚合,制备聚己内酯(PCL),并利用高温凝胶色谱仪、超导核磁共振仪和差示扫描量热仪等仪器对所得产物进行表征和分析.结果表明:①以甲苯作为溶剂,ε-CL浓度为2.0 mol/L,n(ε-CL)∶n(DBU)∶n(LiI)∶n(BnOH)=100∶1∶1∶1,25℃时反应40 min得到的聚合物性能最优,此时PCL产率为98.5%,数均分子质量为22.8 kg/mol,分散性指数为1.15;②最优条件下制备的产物PCL的熔融温度为58.4℃,结晶温度为25.7℃;③1,8-二氮杂二环[5.4.0]十一碳-7-烯/碘化锂双催化体系催化ε-己内酯开环聚合机理为“单体-活化”机理.
In order to obtain biodegradable polymer materials with excellent performance,polycaprolactone(PCL)was pre-pared by using the 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)/lithium iodide(LiI)dual catalytic system,using benzyl alcohol(BnOH)as initiator and synergistically catalyzing the ring-opening polymerization of the monomerε-caprolactone(ε-CL).The product was characterized and analyzed by high-temperature gel chromatography,superconducting nuclear magnetic resonance and differential scanning calorimeter.The results showed that:①The performance of PCL was optimal when toluene was used as solvent,the concentration ofε-CL was 2.0 mol/L,n(ε-CL)∶n(DBU)∶n(LiI)∶n(BnOH)=100∶1∶1∶1,T=25℃,t=40 min.The yield of PCL was 98.5%,the number average molecular weight of PCL was 22.8 kg/mol,and the polymer dispersity index of PCL was 1.15;②The melting temperature and crystallization temperature of PCL prepared under optimal conditions were 58.4℃and 25.7℃,respectively;③The mechanism of ring-opening polymerization ofε-caprolactone catalyzed by the 1,8-diazabicyclo[5.4.0]undec-7-ene/lithium iodide dual catalytic system was the“monomer activation”mechanism.
作者
王艳
肖慧萍
马叶群
WANG Yan;XIAO Huiping;MA Yequn(The Center of Analysis and Test,Shanxi Normal University,Taiyuan 030031,China;Changchun Ecological Environment Monitoring Center,Changchun 130012,China;School of Chemistry and Materials Science,Shanxi Normal University,Taiyuan 030031,China)
出处
《天津师范大学学报（自然科学版）》
CAS
北大核心
2024年第5期18-22,35,共6页
Journal of Tianjin Normal University：Natural Science Edition
基金
山西省基础研究计划项目(2015011029)
校级博士研究生科研项目(020720170002)。
