摘要
以两亲性纳米SiO2为稳定剂构筑Pickering乳液,分别采用偶氮二异丁腈(AIBN)及过硫酸铵(APS)作为引发剂引发苯乙烯单体聚合,制得了不同尺寸及形貌的聚苯乙烯/纳米SiO2(PS/SiO2)复合微球,并分析了Pickering乳液聚合的机理。通过傅里叶变换红外光谱仪(FT-IR)、凝胶渗透色谱-多角度激光光散射联用仪(GPC-MALLS)、热失重分析(TGA)及差示扫描量热仪(DSC)对产物进行了表征,结果表明,AIBN引发所得复合微球为微米级(0.5μm^2.0μm),而APS引发产物为亚微米级(0.1μm^0.5μm),两者引发所得聚合物重均分子量(-Mw)分别为4.780×104g/mol及3.411×105g/mol;复合微球的热性能因纳米SiO2的存在而得到增强。
Stable Pickering emulsion was fabricated using amphiphilic nano-SiO2 particles as stabilizer.Then,two kinds of polystyrene/nano-SiO2（PS/SiO2） composite microspheres,which had different size and different morphology,were synthesized with oil-soluble azobisisobutyronitrile（AIBN） and water-soluble ammonium persulfate（APS） as initiator respectively.The possible mechanisms of Pickering emulsion polymerization initiated by different initiator were discussed.The product was characterized by means of FT-IR,multi angle laser light scattering photometer（GPC-MALLS）,TGA and DSC.When AIBN was used as the initiator,the diameters of the microspheres were micron-sized（0.5 μm^2.0 μm）.While the sub-micron-sized（0.1 μm^0.5 μm） microspheres were obtained by using APS as the initiator.And the weight-average molecular weight（w） of two kinds of polymer is 4.780×104 g/mol and 3.411×105 g/mol,respectively.The results of TGA and DSC indicated that the thermal properties of composite were elevated duo to the existence of nano-SiO2.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2012年第8期14-17,21,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(21004049)
陕西省自然科学基础研究计划项目(2011JM2012)
咸阳师范学院专项科研基金资助项目(10XSYK302)
