摘要
以氯化苄 ( C6 H5CH2 Cl) /四水合氯化亚铁 /三苯基膦为引发体系 ,在 90℃下引发甲基丙烯酸甲酯进行原子转移自由基“活性”/可控聚合反应 ( ATRP) .只有当 Fe与 P的量比值为 1∶ 2时 ,聚合产物数均分子质量 ( Mn)与转化率才呈现一定的线性关系 ,聚合反应机理表现为 ATRP.对于其它 Fe与 P的量比值 ,产物 Mn 与转化率不呈线性关系 ,表明在聚合反应过程中存在多种活性中心 ;由于所使用的氯化亚铁含有结晶水 ,催化剂的制备方式对 ATRP有较大影响 .
Controlled/'living' radical polymerization of methyl methacrylate (MMA) initiated by benzyl chloride has been achieved by atom transfer radical polymerization (ATRP) catalyzed by iron dichloride tetrahydrate/triphenyl phosphine complexes at 90 ℃. When the amount of Fe to P is kept at 1∶2, the polymer number average molecular weight ( M n) increases linearly with conversion, and then the polymerization can be kept controlled and 'living'. If the amount of Fe to P is not kept at 1∶2, the linear relation of M n to conversion does not exist, thus many active centers in the polymerization can form themselves. At the same time, methods of synthesis of iron based catalysts have marked effects upon the ATRP of MMA.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2002年第2期247-250,共4页
Transactions of Beijing Institute of Technology
基金
国家自然科学青年基金项目 ( 2 970 40 0 1)
