Surfactant-induced thermomechanical and morphological changes in TiO2-polystyrene nanocomposites
Surfactant-induced thermomechanical and morphological changes in TiO2-polystyrene nanocomposites
复制标题
DOI：
10.1016/j.jcis.2013.04.053
复制
发表时间：
2013-09-01
影响因子：
9.9
通讯作者：
Athanassiou, Athanassia
中科院分区：
文献类型：
--
作者：
Patra, Niranjan;Salerno, Marco;Athanassiou, Athanassia
将预合成的油酸修饰的胶体二氧化钛纳米棒与商品聚苯乙烯通过三氯甲烷溶剂共混，制备了不同载量的聚苯乙烯/二氧化钛胶体纳米棒纳米复合材料。用广角X射线衍射仪和透射电子显微镜对纳米复合材料的微观结构和形貌进行了表征。结果表明，表面活性剂在聚合物与填料之间的相互作用中起着重要作用。差示扫描量热分析表明，纳米复合材料的玻璃化转变温度降低，这与表面活性剂在聚苯乙烯中起到增塑剂的作用是一致的。热重分析表明，在400℃以下，纳米复合材料的热稳定性与裸PS相比没有明显的改善，但在400℃后，TGA曲线比裸PS略有移动。动态力学性能测试表明，当纳米棒含量为2%和4wt%时，复合材料的储能模数、损耗模数和玻璃化转变温度不随纳米棒含量的增加而变化，当纳米棒含量增加到8wt%时，复合材料的储能模数、损耗模数和玻璃化转变温度均有所下降。透射电子显微镜图像清楚地显示了聚苯乙烯基质中的脱粘特征。(C)2013 Elsevier Inc.保留所有权利。
Nanocomposites of polystyrene and TiO2 colloidal nanorods with different loadings have been prepared by mixing pre-synthesized oleic acid capped colloidal TiO2 nanorods into commercial polystyrene via solvent blending using chloroform. The microstructure and morphology of the nanocomposites was evaluated by wide angle X-ray diffraction and transmission electron microscopy. The observations revealed that the surfactant plays an important role for interactions between the polymer and the filler. Differential scanning calorimetry showed that the glass transition temperature of the nanocomposites decreased which is consistent with the surfactant acting as a plasticizer in the polystyrene matrix. Thermogravimetric analysis revealed that the nanocomposites show no significant improvement in thermal stability as compared to the bare PS up to a temperature of 400 degrees C. However, after 400 degrees C, the TGA curve shifts a little to higher temperature as compared to the bare PS. The dynamic mechanical properties of the nanocomposites indicate that the storage modulus, loss modulus, and glass transition temperature do not change with increasing nanorods content of 2 and 4 wt% but decrease afterward for 8 wt%. Transmission electron microscopy images clearly show debonding characteristics in polystyrene matrix. (C) 2013 Elsevier Inc. All rights reserved.