摘要
设计并合成交联聚苯乙烯中空微球.采用两相溶胶-凝胶法,以正硅酸乙酯(TEOS)为原料,制备单分散性二氧化硅微球,用γ-(甲基丙烯酸酰氧)丙基三甲氧基硅烷(KH-570)硅烷偶联剂对SiO_2进行表面处理后,通过种子乳液聚合方法,将苯乙烯和二乙烯基苯的共聚物负载在SiO_2种子微球或SiO_2-KH570微球表面.利用氢氟酸(HF)刻蚀掉微球内核SiO_2,得到交联聚苯乙烯中空结构的微球.利用红外光谱(FTIR)、扫描电镜(SEM)等方法对微球进行分析与表征.重点讨论TEOS用量对种子微球大小的影响,种子表面改性与否及共聚单体用量对复合微球、表面形貌和刻蚀后表面形貌的影响.结果表明:当TEOS用量为58.07 m L时所得种子微球的直径为580 nm,且呈规则的球形.微球的大小随TEOS用量的增加而变大.种子微球经过硅烷偶联剂进行表面改性大大提高了包覆率,增强了壳与核之间的相互作用,且有助于保留刻蚀后微球的形貌特征.共聚单体的用量不能过高,否则会出现独立成核的乙烯-二乙烯基苯共聚物.
In this paper, a cross-linked polystyrene hollow microsphere was designed and synthesized successfully. Firstly ,monodispersed seed SiO2 microsphere was synthesized by two-phase sol-gel method using tetra-ethylortho silicate as raw materials. The surface of seed was treated with coupling agent - （methacrylic acid） propyl trimethoxysilane （KH-570）. Then by seed emulsion polymerization method, styrene-divinylbenzene copolymer was grafted on the surface of SiO2 or SiO2-KH570 microsphere. Finally,the core of seed SiO2 was removed by HF etching. The morphology of the obtained seed and microsphere were characterized bv SEM and FTIR. The effects of TEOS dosage, surface modification and comonomer dosage on the morphology of the product microsphere were mainly discussed. The results showed that when TEOS volume is 58.07 mL, the diameter of microsphere is 580 nm and in a regular spherical shape. The size of microsphere increases with the TEOS dosage increasing. The surface modification of seed greatly improves the interaction between the core and the shell. Etching does not change the morphology of the microspheres. High dosage of co-monomer leads to the appearance of the self-nucleated St-DVB copolymer.
出处
《沈阳化工大学学报》
CAS
2016年第4期326-332,共7页
Journal of Shenyang University of Chemical Technology
基金
国家自然科学基金(51203092)
作者简介
宫衍革（1988-），女，山东济宁人，硕士研究生在读，主要从事高分子化学方面的研究．
通讯联系人：杨凤（1973-），女，辽宁兴城人，副教授，博士，主要从事天然橡胶改性的研究．
