论文部分内容阅读
用固定化酶Novozyme435(NV435)催化2,2羟甲基丁酸(2,2-bis(hydroxymethyl)butyricacid),开环缩聚得到端基带有羧基和羟基的树枝状聚酯,用α-溴代丙酰溴将聚酯的端羟基功能化,从而形成超枝化大分子引发剂,在CuCl/多氮配体(HMTETA)体系中引发苯乙烯进行原子转移自由基聚合反应(ATRP),得到聚己内酯聚苯乙烯嵌段共聚物(P(ε-CL)-b-PSt),通过核磁共振(NMR)确证了聚合物结构,用凝胶渗透色谱(GPC)测定聚合物分子量及分布.
The 2,2’-bis (hydroxymethyl) butyric acid was catalyzed by the immobilized enzyme Novozyme435 (NV435) to obtain the dendritic polyester with terminal carboxyl and hydroxyl groups by ring-opening polycondensation. Propionyl bromide functionalized the terminal hydroxyl groups of the polyester to form a hyperbranched macromolecular initiator, initiating an atom transfer radical polymerization (ATRP) of the styrene in a CuCl / poly-nitrogen ligand (HMTETA) system to give a poly Caprolactone polystyrene block copolymer (P (ε-CL) -b-PSt) was used to confirm the structure of the polymer by nuclear magnetic resonance (NMR). The molecular weight and distribution of the polymer were determined by gel permeation chromatography (GPC).