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4.780×10^4g/mol及3.411×10^5g/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.
参考文献
| [1] | 刘春华,潘才元.通过RAFT聚合制备SiO2/接枝共聚物纳米杂化粒子[J].高等学校化学学报,2008(02):404-408. |
| [2] | Hongxia Liu;Chaoyang Wang;Quanxing Gao;Jianxin Chen;Xinxing Liu;Zhen Tong .One-pot Fabrication Of Magnetic Nanocomposite Microcapsules[J].Materials Letters,2009(11):884-886. |
| [3] | Facile fabrication of nanocomposite microspheres with polymer cores and magnetic shells by Pickering suspension polymerization[J].Reactive & functional polymers,2009(10):750. |
| [4] | Binks BP.;Lumsdon SO. .Influence of particle wettability on the type and stability of surfactant-free emulsions[J].Langmuir: The ACS Journal of Surfaces and Colloids,2000(23):8622-8631. |
| [5] | 张卫红,范晓东,范伟伟,田威.Pickering乳液聚合制备中空聚苯乙烯复合微球[J].功能材料,2010(04):644-647,651. |
| [6] | K.Zhang;W.Wu;H.Meng .Pickering emulsion polymerization:Preparation of polystyrene/nano-SiO2 composite microspheres with core-shell structure[J].Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems,2009(3):393-400. |
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