摘要
以羟基硅油、苯乙烯为主要原料,采用半连续乳液聚合方法制得具有核壳结构的有机硅-聚苯乙烯聚合物乳液,将其进行喷雾干燥制得聚合物粉末,考察了3种不同引发体系对聚合物乳液稳定性和单体转化率的影响,并对其进行了红外光谱、透射电子显微镜分析。结果表明,3种引发体系均成功合成了有机硅-聚苯乙烯共聚物,且制得的聚合物乳液有较明显的核壳结构和较好的稳定性;采用过硫酸铵、亚硫酸氢钠和过氧化二苯甲酰组成的复合引发体系(APS+NaHSO_(3)+BPO)制备的聚合物乳液单体转化率最高,可达93.24%。对由APS+NaHSO_(3)+BPO复合引发体系制备的聚合物粉末进行了扫描电镜和热失重表征,结果显示,在-50~180℃内有机硅-聚苯乙烯粉末没有明显的失重峰,在500~580℃区间内,粉末热失重达61.91%,表明该聚合物具有良好的耐高低温性能,可在较宽温度范围内使用并仍旧保持良好的性能。
The silicone-polystyrene polymer emulsion with core-shell structure was prepared by semi-continuous emulsion polymerization with hydroxyl silicone oil and styrene as the materials.Then the polymer powder was prepared by spray drying.The effects of three initiation systems on the stability of polymer emulsion and monomer conversion were investigated and analyzed by IR and TEM.The results show that silicone-polystyrene copolymer has been successfully synthesized,and the prepared polymer emulsion has obvious core-shell structure and good stability.The polymer emulsion prepared by APS-NaHSO _(3)-BPO initiation system,has the highest conversion rate of 93.24%.The polymer powders prepared by APS-NaHSO _(3)-BPO initiation system has been characterized by DSC and TGA.There s no obvious weight loss peak at-50-180℃,and the thermal weight loss reaches 61.91%at 500-580℃,which indicates that the polymer has good resistance to high-low temperature,it can be used in a wide range of temperature and keep good performance.
作者
张镇鹏
刘美意
马凤国
ZHANG Zhenpeng;LIU Meiyi;MA Fengguo(Key Laboratory of Rubber-Plastics,Ministry of Education,Qingdao University of Science and Technology,Qingdao 266042,China)
出处
《有机硅材料》
CAS
2024年第4期37-41,共5页
Silicone Material
关键词
半连续
乳液聚合
引发体系
核壳结构
微球粉末
有机硅
聚苯乙烯
semi-continuous
emulsion polymerization
initiation system
core-shell structure
microsphere powder
silicone
polystyrene
