摘要
采用表面接枝和聚合改性的方法,分别以γ-缩水甘油醚氧丙基三甲基硅烷(GPS)和甲基丙烯酸甲酯(MMA)对纳米二氧化钛(TiO_2)进行表面修饰,通过熔融共混制得聚对苯二甲酸乙二醇酯(PET)/GPS- TiO_2和PET/聚甲基丙烯酸甲酯(PMMA)-TiO_2纳米复合材料,用差示扫描量热法研究了其复合材料的非等温结晶行为,利用不同动力学模型对其结晶过程进行处理。结果表明：未处理的纳米TiO_2提高了PET的熔融温度和结晶温度；而经表面接枝的GPS-TiO_2和PMMA-TiO_2对PET的熔融温度和结晶温度的影响并不显著；不同表面特性的纳米TiO_2降低了PET的结晶度,但经表面接枝后的纳米TiO_2其影响程度减弱；用Jezi- omy法和莫志深法处理PET/TiO_2纳米复合材料的非等温结晶过程比较理想,PET,PET/PMMA-TiO_2,PET/ TiO_2,PET/GPS-TiO_2复合材料的结晶速率依次减小。
The TiO2 nanoparticles were subjected to surface modification using y-glycidoxypropyl trimethoxy silane （GPS） and methyl methacrylate （MMA） by surface grafting and polymerization and were melted and blended to produce polyethylene terephthalate （PET）/GPS-TiO2 and PET/polymethyl methacrylate （PMMA）-TiO2 nanocomposites. The non-isothermal crystallization behavior of the nonacomposites was studied by differential scanning calorimetry. The crystallization process was processed with different kinetic models. The results showed that the untreated TiO2 nanoparticles can increase the melting temperature and crystallization temperature of PET; the surface grafted GPS-TiO2 and PMMA-TiO2 had no profound effect on the melting temperature and crystallization temperature of PET; and the TiO2 nanoparticles with different surface characteristics can decrease the crystallization temperature of PET, but the effect became weak after surface grafting treatment. Jeziorny and Mozhishen methods were satisfying in analyzing the non-isothermal crystallization process of PET/TiO2 nanoparticles. The composites were in such an order from high to low crystallization rate： PET, PET/PMMA-Ti02, PET/TiO2, PET/GPS-TiO2.
出处
《合成纤维工业》
CAS
CSCD
北大核心
2006年第4期17-20,共4页
China Synthetic Fiber Industry
