摘要
在紫外光作用下,二苯甲酮、蒽醌和安息香能通过夺氢反应使异戊二烯在四氟乙烯-丙烯共聚物中接枝,接枝反应按三重态自由基引发机理进行,接枝率随光照时间的增长而增加,但不会超过40％。和异戊二烯的自由基聚合反应不一样,接枝物中聚异戊二烯接枝链的微结构以3,4-和1,2-聚合为主,而前者以1,4-聚合为主。Ce^(+4)及Fe^(+2)-H_2O_2等氧化还原体系对该接枝反应不产生作用.极性溶剂四氢呋喃的加入,对接枝链微结构的影响很小。
The graft copolymerization of isoprene on the surface of tetrafluoroethylene-co-propylene-could take place by abstracting the hydrogen atom from propylene in copolymer by benzophene anthroquinone and beizoin at UV irradiating- The graft reaction carries out on the mechanism of triplet radicals.The graft efficiency increases with the lengthening of irradiation time,but no more than 40%.The microstructure of grafting chain of polyisoprene is mainly composed of 3,4- and 1,2-polymerization of isoprene.And the polymerisoprene made by radical polymerization consisted of 1,4-polymerization of isoprene essentially.The redox initiation system used for this graft copolymerization,such as Ce+4 or Fe+2-H2O3 is ineffective.The polar solvent,for example THF,has little influence on the microstructure-of grafting chain of polyisoprene.
出处
《感光科学与光化学》
CSCD
1990年第3期186-191,共6页
Photographic Science and Photochemistry
关键词
异戊二烯
四氟乙烯
丙烯
共聚
接枝
isoprene,photochemical graft,copolymer of tetrafluoroethylene and propylene
