摘要
以聚乙二醇(PEG-400)、环氧氯丙烷为原料,氢氧化钾为缚酸剂,十六烷基三甲基溴化铵为相转移催化剂制得聚乙二醇缩水甘油醚(epoxide-PEG-epoxide)。然后,在氢氧化钠水溶液中,聚乙二醇缩水甘油醚中的环氧键水解生成分子链两端各含有两个羟基的大分子引发剂((HO)2PEG(OH)2)。最终,以辛酸亚锡为催化剂,端羟基大分子引发剂引发ε–己内酯开环聚合,合成了不同相对分子质量的H型两亲性嵌段共聚物((PCL)2PEG(PCL)2)。通过红外光谱(FTIR)和核磁共振氢谱(1H-NMR),聚乙二醇缩水甘油醚,端羟基大分子引发剂和H型两亲性嵌段共聚物的结构得到了确认。示差扫描量热法对两亲性嵌段共聚物热性能的研究表明:当亲水段的聚乙二醇分子量为400时,聚合物的熔融温度主要受疏水段的聚己内酯影响,随着聚己内酯链段长度的增加,熔融温度升高。
The synthesis of a noval H-shaped amphiphilic block copolymers ((PCL) 2PEG (PCL)2 ) by three steps was described. Firstly,polyethylene glycol bisglycidyl ether (epoxide-PEG-epoxide) was synthesized by the reaction of polyethylene glycol (PEG-400) with epichlorohydrin, and KOH as removal acid reagent, under the phase-transfer catalyst of cetyltrimethylaminonium bromide. In the second step, the macroinitiator ((HO) 2PEG(OH)2 ) was prepared by the hydrolysis of polyethylene glycol bisglycidyl ether in the NaOH aqueous solution. Finally,a series of different molecular weight H-shaped block copolymers ((PCL) 2PEG (PCL)2 ) was used as a maeroinitiator for the ring-openning polymerization (ROP) of e- caprolactone (e-CL) catalyzed by tinoctoaote (Sn(Oct) 2)" The FTIR and I H-NMR were used to characterize the structure of the polyethylene glycol bisglycidyl ether, macroinitiator ( HO ) 2PEG ( OH ) 2, and H-shaped block copolymers (PCL) 2PEG (PCL)2. The DSC of H-shaped block copolymers showed that melting temperature (Tin) of copolymers rised with the increasing of molecular weight of PCL segment,when the hydrophilie segment was PEG-400.
出处
《塑料》
CAS
CSCD
北大核心
2011年第2期46-49,共4页
Plastics
基金
陕西省科技攻关项目(2008K07-32)
陕西科技大学研究生创新基金
关键词
H型两亲性嵌段共聚物
聚乙二醇
聚己内酯
开环聚合
生物可降解
H-shaped amphiphilic block copolymers
poly ( ethylene glycol)
poly ( e-caprolactone )
ring-openningpolymerization
biodegradable