Guo Gang, Yu Jie, Luo Zhu, Zhou LiangXue, Liang Hang, Luo Feng, Qian ZhiYong
State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China.
J Nanosci Nanotechnol. 2011 Jun;11(6):4923-8. doi: 10.1166/jnn.2011.4119.
Poly(methyl methacrylate-butyl acrylate) [P(MMA-BA)]/nanosized titanium oxide (nano-TiO2) composite particles were prepared via insitu emulsion polymerization of MMA and BA in presence of nano-TiO2 particles. Before polymerization, the nano-TiO2 particles were modified by coupling agent. The structure and thermal properties of the obtained P(MMA-BA)/nano-TiO2 composite particles were characterized by Fourier transform infrared spectra (FTIR), wide-angle X-ray diffraction (WAXD) and thermogravimetric analysis (TGA). The results showed that there are covalent bond bindings between P(MMA-BA) and nano-TiO2 particles, meaning that P(MMA-BA) and nano-TiO2 particles were not simply blended or mixed up and that there is a strong interaction between P(MMA-BA) and nano-TiO2 particles. TGA and DSC measurements indicated an enhancement of thermal stability. Transmission electron microscopy (TEM) results showed that P(MMA-BA) enhanced the dispersibility of nano-TiO2 particles. The dispersion stabilization of modified nano-TiO2 particles in aqueous system was significantly improved due to the introduction of grafted polymer on the surface of nano-particles.
通过在纳米二氧化钛（nano-TiO₂）颗粒存在的情况下对甲基丙烯酸甲酯（MMA）和丙烯酸丁酯（BA）进行原位乳液聚合，制备了聚（甲基丙烯酸甲酯-丙烯酸丁酯）[P（MMA-BA）]/纳米二氧化钛（nano-TiO₂）复合颗粒。在聚合之前，纳米TiO₂颗粒用偶联剂进行了改性。通过傅里叶变换红外光谱（FTIR）、广角X射线衍射（WAXD）和热重分析（TGA）对所得P（MMA-BA）/纳米TiO₂复合颗粒的结构和热性能进行了表征。结果表明，P（MMA-BA）与纳米TiO₂颗粒之间存在共价键结合，这意味着P（MMA-BA）与纳米TiO₂颗粒并非简单地混合或掺和在一起，且P（MMA-BA）与纳米TiO₂颗粒之间存在强相互作用。TGA和DSC测量表明热稳定性有所提高。透射电子显微镜（TEM）结果表明，P（MMA-BA）提高了纳米TiO₂颗粒的分散性。由于纳米颗粒表面接枝聚合物的引入，改性纳米TiO₂颗粒在水体系中的分散稳定性得到了显著改善。
