摘要
本文研究了以二苯酮为光敏剂,在365nm光照下丙烯酰胺在聚醚氨酯表面的接枝聚合。研究了光照时间、单体浓度、二苯酮浓度对接枝率的影响。对产物作吸水性测定和扫描电镜观察,均证实是接枝共聚物。通过模型化合物的研究,认为激发三线态的二苯酮提取了聚醚氨酯中聚醚软段叔碳原子的氢和氨酯基氮原子上的氢,使这些部位产生自由基,引发单体接枝聚合。
Photo-induced grafting polymerization of acrylamide (AAM) onto polyetherurethane (PEU) was studied with benzophenone (BP) as sensitizer under irradiation of 365 nm. The effects of irradiation time, concentrations of monomer and sensitizer on the grafting yield were investigated. The formatioin of graft copolymer was verified by its water absorption % and the scanning electron microscopy photographs. Some model compounds of PEU soft segment and hard segment were used to clarify the graft reaction mechanism, which was proposed to involve the hydrogen abstraction by excited triplet BP from a-carbon of the polyether segment and from nitrogen of the hard segment. The produced radicals then initiate the graft polymerization.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1990年第1期93-98,共6页
Acta Polymerica Sinica
基金
国家自然科学基金资助课题
关键词
聚醚氨酯
丙烯酰胺
接枝聚合
Polyetherurethane,Acrylamide, Benzophenone, UV-induced grafting
