摘要
研究了笼形聚肟偕亚氨二乙酸钒(CPV)-硫脲(TU)体系在硝酸溶液中引发丙烯腈(AN)聚合反应.表观聚合速度(R_P)是 R_P=1.0×10~8e^(-10.500/RT)[AN]^(1.0)[CPV]^(1.0)[TU]^(1.5)[HNO_3]^(3.0) 聚合诱导期(τ)随反应温度和物料浓度发生变化,可表示为 1/τ=5.2×10~9e^(-12.800/RT)[AN]~1.0[CPV]~1.0[TU]~1.5[HNO_3]~3.0实验结果表明,聚合反应以单基终止为特征,可能是和高分子载体较大的空间位阻有关.
The polymerization of acrylonitrile (AN) in aqueous nitricacid initiated by 'cage' vanadyl(IV) poly (oxime-imidodiacetate) (CPV)-thiourea (TU) system has been investigated. The overall rate of polymerization isRP = 10×108e-10.500 /RT[AN]1.0[CPV]1.0[TU]1.5[HNO3]3.0The length of the induction period (r) varies with the polymerization temperature and the substrate concentrations. It may be written as1/τ = 5.2×109e-12.800/RT[AN]1.0[CPV]1.0[TU]1.5[HNO3]3.0 These results suggests that the chain radicals are terminated via bimolecular reaction predominately. Possibly, it is affected by the steric hindrance of the bulky polymer supporter.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1992年第4期391-397,共7页
Acta Polymerica Sinica
基金
国家自然科学基金
关键词
丙烯腈
聚合动力学
CPV-TU引发
Cage' polymer supported catalyst, Poly (oxime-imidodiacetate)-thiourea system, acrylonitrile, Kinetics of polymerization
