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首页> 外文期刊>RSC Advances >Effect of benzoic acid surface modified alumina nanoparticles on the mechanical properties and crystallization behavior of isotactic polypropylene nanocomposites
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Effect of benzoic acid surface modified alumina nanoparticles on the mechanical properties and crystallization behavior of isotactic polypropylene nanocomposites

机译：苯甲酸表面改性氧化铝纳米粒子对全同立构聚丙烯纳米复合材料力学性能和结晶行为的影响

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摘要

The effect of benzoic acid (BA) surface modified alumina (Al _(2) O _(3) ) nanoparticles (NPs) on the mechanical properties and crystallization behavior of isotactic polypropylene (iPP) nanocomposites was studied. Characterization of the modified Al _(2) O _(3) NPs (BA-Al _(2) O _(3) ) 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-Al _(2) O _(3) . 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-Al _(2) O _(3) . Furthermore, the interchain conformational ordering of iPP was significantly accelerated in the presence of the BA-Al _(2) O _(3) NPs. The CH–π interaction between the polymer and BA-Al _(2) O _(3) NPs was considered to facilitate the attachment of the iPP chains and stimulate conformational ordering, crystallization, as well as mechanical properties of nanocomposites.
机译：研究了苯甲酸（BA）表面改性的氧化铝（Al _（2）O _（3））纳米颗粒（NPs）对全同立构聚丙烯（iPP）纳米复合材料的力学性能和结晶行为的影响。 FTIR和XRD分析表征改性的Al _（2）O _（3）NPs（BA-Al _（2）O _（3））证实苯甲酸分子化学吸附在NPs的表面上，形成苯基丰富的微结构。对于仅具有0.2重量％的BA-Al _（2）O _（3）的纳米复合材料，观察到了拉伸强度，挠曲模量和韧性的显着增加。实现了与基质的增强的界面粘附，这使得能够有效增强纳米复合材料。较高的结晶温度和较短的结晶半衰期表明BA-Al _（2）O _（3）的成核活性较高。此外，在存在BA-A1 _（2）O _（3）NP的情况下，iPP的链间构象排序显着加速。聚合物与BA-Al _（2）O _（3）NP之间的CH-π相互作用被认为有助于iPP链的连接并刺激构象有序，结晶以及纳米复合材料的机械性能。

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