摘要
以芘为荧光探针,探讨了有机硅-丙烯酸酯核壳乳液聚合过程中,芘的第一振动峰(373 nm处)与第三振动峰(384 nm处)荧光强度的比值I1/I3与乳化剂、有机硅单体(D4)和引发剂(KPS)用量之间的关系,并结合聚合过程中探针芘的I1/I3峰值与单体转化率及乳胶粒形态演变之间的关系,研究了核壳结构有机硅-丙烯酸酯乳液的聚合行为.研究结果表明,探针芘的I1/I3峰值随乳化剂用量,D4用量,KPS用量不同发生相应的变化,随单体转化率的增加而增大.当乳化剂用量、D4用量、KPS与总单体的质量比依次为2 g、8 g、0.7%时,得到的乳液具有优良的综合性能.聚合反应过程中,当种子乳胶粒转变为核壳乳胶粒时,芘的I1/I3峰值仍呈现出明显的转变,说明有机硅-丙烯酸酯核壳乳液具有互穿聚合物网络结构.因此,荧光探针可用于研究有机硅-丙烯酸酯核壳乳液聚合反应进程.
The relationship of the amounts of emulsifier, organosilicon monomer octamethylcyclotetrasiloxane （D4） and initiator （KPS） with the ratio of fluorescence intensity between first vibronic peak of pyrene （λ= 373 nm） and third vibronic peak of pyrene （λ=384 nm） I1/I3 was discussed during the emulsion polymerization process, in which pyrene was used as a fluorescence probe. The polymerization behavior of the organosilicon-acrylate latex with core-shell structure was investigated on line with the relationship of monomer conversion and development of morphology in latex particles with the value of I1/I3 for probe pyrene during the polymerization process. It showed that the values of I1/I3 for probe pyrene changed with changing the amounts of emulsifier, D4, KPS and increased with increasing the monomer conversion. A good performance emulsion was obtained while the amounts of emulsifier, D4, mass ratio between KPS and the whole monomer was 2 g, 8 g and 0.7%, respectively. The values of I1/I3 for probe pyrene also changed obviously when the morphology of latex particles transformed from seeded latex particles into core-shell latex particles during the polymerization process. That means the organosilicon-acrylate latex with core-shell structure exhibits an interpenetrating polymer network （IPN） structure. Therefore, fluorescence probe technique can be used to study the progress of the polymerization behavior of organosilion-acrylate latex with core-shell structure.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2010年第3期268-273,共6页
Acta Polymerica Sinica
关键词
荧光探针
有机硅-丙烯酸酯乳液
核壳结构
聚合行为
Florescence probe Organosilicon-acrylate latex Core-shell structure Polymerization behavior
作者简介
通讯联系人，E-mail：mlsys607@126．com
