Block copolymer materials from the organocatalytic ring-opening polymerization of a pentaerythritol-derived cyclic carbonate
作者:Ruairí P. Brannigan、Anthony Walder、Andrew P. Dove
DOI:10.1002/pola.27246
日期:2014.8.15
0]undec‐7‐ene dual organocatalytic system. It was found that the organocatalyst allowed for the synthesis of well‐defined polymers with minimal adverse side reactions and low dispersities. This system was then employed in the ROP of PTO initiated from an α,ω‐dihydroxy poly(caprolactone) (PCL) macroinitiator, with varying molecular weights, to yield a series of A‐B‐A block copolymers. These materials were characterized
由季戊四醇经苯甲醛与苯甲醛的酸催化缩醛形成反应,然后用氯甲酸乙酯闭环,合成了9-苯基-2,4,8,10-四氧杂螺[5,5]十一烷酮(PTO)。随后使用1-(3,5-双(三氟甲基)苯基)-3-环己基硫脲和1从1,4-丁二醇(1,4-BDO)引发的开环聚合(ROP)聚合环状碳酸酯单体。 ,8-二氮杂双环[5.4.0]十一碳-7-烯双有机催化体系。结果发现,有机催化剂可以合成具有良好定义的聚合物,同时具有最小的不利副反应和低分散性。然后将该系统用于由不同分子量的α,ω-二羟基聚己内酯(PCL)大分子引发剂引发的PTO的ROP中,以生成一系列的A-B-A嵌段共聚物。1 H NMR光谱,凝胶渗透色谱,差示扫描量热法,热重分析和拉伸分析。已发现,具有聚(PTO)(PPTO)嵌段的PCL的链增长产生了一种热塑性材料,其拉伸性能(伸长率和杨氏模量)优于PCL均聚物。此外,应注意的是,可以采用添加PPTO来