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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.
Using pyrene as a fluorescent probe, the ratio of I1 / I3 to the fluorescence intensity at the third vibrational peak (384 nm) of the first vibrational peak (at 373 nm) and the pyrene vibration in the silicone-acrylate core-shell emulsion polymerization Emulsifier, organosilicon monomer (D4) and initiator (KPS) were studied. Based on the relationship between the peak I1 / I3 of pyrene and the monomer conversion and the morphological changes of latex particles during the polymerization, The polymerization behavior of silicone-acrylic emulsion with core-shell structure was studied.The results showed that the peak value of I1 / I3 of pyrene changed with the amount of emulsifier, the amount of D4 and the dosage of KPS, with the increase of monomer conversion But when the mass ratio of emulsifier, D4, KPS and total monomer were 2 g, 8 g, 0.7%, the obtained emulsion had excellent comprehensive properties.In the polymerization reaction, when the seed latex particles The results showed that the peak of I1 / I3 of pyrene was obviously changed when the core-shell latex particles were changed, indicating that the silicone-acrylate core-shell emulsion has an interpenetrating polymer network structure. Therefore, the fluorescent probe can be used to study the effect of silicone- Ester core shell emulsion polymerization reaction process