摘要
合成了过氧化茨烷酮酰 (KPO) ,用它和Cr(Ac) 2 组成的氧化还原体系经陈化后 ,引发甲基丙烯酸甲酯 ,甲基丙烯酸 β 羟乙酯和丙烯酸进行了聚合反应 .其中甲基丙烯酸甲酯具有活性聚合特征 .并有效引发含羟基单体如甲基丙烯酸 β羟乙酯和丙烯酸进行聚合 .实验表明 ,引发剂利用效率随陈化温度的升高而降低 .
Ketopinyl peroxide (KPO) was synthesized by the reaction of ketopinyl chloride with Na\-2O\-2 in the presence of 15\|crown\|5.The reaction of KPO with Cr(II) formed radicals,anions and Cr(III)s. The radicals existed as “free” radicals and in the form complexes which consisted of radicals,anions and Cr(III)s. After aging of the redox system,the “free” radicals were terminated by the coupling reaction,but radicals in the complexes were relatively stable due to the β keto group and steric effect,and initiated methyl (meth) acrylate to polymerize with “living” characteristics,when polymerization was carried out bellow 30℃.Other monomers,vinyl acetate,hydroxyethylene methacrylate and acrylic acid (AA) could be polymerized using this initiator system and crosslinked PAA was obtained in several minutes.The initiator efficiency (f) of the aged KPO and Cr 2+ was intensively affected by the aging temperature,and varied from 30% at 0℃ to 5% at 20℃.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第3期330-334,共5页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目!(基金号 2 97740 2 7)
关键词
“活性”自由基聚合
过氧化莰烷酮酰
铬
引发剂
Living radical polymerization, Redox initiator, Ketopinyl peroxide initiator efficiency, Aging
