Jiang Xiaofeng, Zhang Wenxue, Zhao Shicheng, Zhou Shuai, Shi YaoQi, Xin Zhong
Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State-Key Laboratory of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China
Lanzhou Petrochemical Research Center PetroChina 730060 China.
RSC Adv. 2018 Jun 6;8(37):20790-20800. doi: 10.1039/c8ra01069b. eCollection 2018 Jun 5.
The effect of benzoic acid (BA) surface modified alumina (AlO) nanoparticles (NPs) on the mechanical properties and crystallization behavior of isotactic polypropylene (iPP) nanocomposites was studied. Characterization of the modified AlO NPs (BA-AlO) by FTIR and XRD analyses confirmed that benzoic acid molecules chemisorb on the surface of the NPs, forming benzene groups-rich microstructures. A considerable increase in the tensile strength, flexural modulus, and toughness was observed for the nanocomposites with only 0.2 wt% BA-AlO. Enhanced interfacial adhesion with the matrix was achieved, which enabled effective reinforcement of the nanocomposites. The higher crystallization temperature along with shorter crystallization halftime indicated the higher nucleation activity of BA-AlO. Furthermore, the interchain conformational ordering of iPP was significantly accelerated in the presence of the BA-AlO NPs. The CH-π interaction between the polymer and BA-AlO NPs was considered to facilitate the attachment of the iPP chains and stimulate conformational ordering, crystallization, as well as mechanical properties of nanocomposites.
研究了苯甲酸（BA）表面改性氧化铝（AlO）纳米粒子（NPs）对全同立构聚丙烯（iPP）纳米复合材料力学性能和结晶行为的影响。通过傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）分析对改性AlO NPs（BA-AlO）进行表征，证实苯甲酸分子化学吸附在NPs表面，形成富含苯基团的微观结构。对于仅含有0.2 wt% BA-AlO的纳米复合材料，观察到其拉伸强度、弯曲模量和韧性有显著提高。实现了与基体增强的界面粘附，从而有效地增强了纳米复合材料。较高的结晶温度以及较短的结晶半衰期表明BA-AlO具有较高的成核活性。此外，在BA-AlO NPs存在下，iPP的链间构象有序化显著加速。聚合物与BA-AlO NPs之间的CH-π相互作用被认为有助于iPP链的附着，并促进纳米复合材料的构象有序化、结晶以及力学性能。
