论文部分内容阅读
本文描述了硫脲亚锡作为催化剂在苯甲醇作为引发剂的情况下,催化δ-戊内酯(δ-VL)和ε-己内酯(ε-CL)在溶液中开环聚合制备相应的聚酯。反应体系中以苄醇为引发剂,通过核磁与MALDI-TOF MS表征确定了聚合产物的化学结构,明确了末端基团与引发机制。所调控的内酯开环聚合均呈可控-活性聚合,嵌段反应以及扩链反应正是建立在活性聚合的基础上。硫脲亚锡包括一个金属配位点与氢键活化位点,通过配位及氢键化作用,活化底物中潜在的亲电中心,催化活性较硫脲-胺体系提升显著。
Described here is the use of thiourea tin oxide as a catalyst to catalyze the ring opening polymerization of δ-valerolactone (δ-VL) and ε-caprolactone (ε-CL) in solution in the presence of benzyl alcohol as the initiator Polyester. In the reaction system, benzyl alcohol was used as the initiator to confirm the chemical structure of the polymerization product by NMR and MALDI-TOF MS. The terminal groups and initiation mechanism were clarified. The controlled lactone ring-opening polymerization were controlled - living polymerization, block reaction and chain extension reaction is based on the living polymerization. Thiourea stannous includes a metal coordination site and a hydrogen bond activation site, which can activate the potential electrophilic center of the substrate through coordination and hydrogen bonding, and the catalytic activity is significantly improved compared with the thiourea-amine system.