摘要
提出了一种反向原子转移自由基聚合(RATRP)引发体系EB iB/SnC l2.2H2O/FeC l3.6H2O。实验发现,EB iB/SnC l2.2H2O与不同配体络合后,均能引发甲基丙烯酸甲酯(MMA)聚合,但引发效率小于10%,所得聚合物的分子量分布较宽(Mw/Mn>2.0)。当加入FeC l3.6H2O后,引发效率大大提高(>80%),聚合速度明显加快,所得聚合物的分子量分布明显变窄(Mn/Mw<1.28),体系呈现活性聚合特征。分别考察了以N,N,N,’N,”N”-(五丙烯酸甲酯基)二乙烯三胺(MA5-DETA)和三苯基膦(PPh3)为络合剂时,EB iB/SnC l2.2H2O/FeC l3.6H2O催化MMA的本体和溶液聚合的规律并探讨了引发机理。
The SnCl2·2H2O with EBiB was foundto act as the initiator for the radical polymerization of methyl methacrylate （MMA） in the presence of N, N, N＇, N＇＇, N＇＇-penta（ methyl acylate）diethylenetriamine （HA5 -DETA）or PPh3. The system belongs to conventional radical polymerization yielding the polymer with Mw,/Mn 〉 2. 0 and initiating efficiencies less than 10%. With the catalysis of FeC13 , 6H2O,the newly formed RATRP system becomes a well -controlled one. The polymerization of MMA catalyzed by EBiB/SnCL2 · 2H2O/FeC13 · 6H2O system shows good controllability and high initiating efficiencies （more than 80% ）either in bulk or in solution. And the mechanism was investigated.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2006年第2期143-147,共5页
Chemical Research and Application
基金
国家自然科学基金(20474042)
