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首页> 外文期刊>Journal of Applied Polymer Science >Interfacial influence on mechanical properties of polypropylene/polypropylene-grafted silica nanocomposites
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Interfacial influence on mechanical properties of polypropylene/polypropylene-grafted silica nanocomposites

机译：聚丙烯/聚丙烯接枝二氧化硅纳米复合材料的界面影响

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摘要

Three types of polypropylene-grafted silica (PGS-2 K, PGS-8 K and PGS-30 K) with different grafting chain lengths were prepared. After melt-blending PGS with polypropylene (PP), we studied the PP/PGS interface properties and the influence of PP/PGS interfaces on mechanical properties of nanocomposites. The strong matrix/particle interface was observed in PP/PGS-30 K nanocomposites with 5 wt % particle loading as evidenced by 2.5 degrees C increased glass transition temperature (T-g) compared with neat PP, whereas the weak matrix/particle interface was observed in PP/PGS-2 K nanocomposites with decreased T-g. The variations in the matrix/particle interfacial strength lead to a transition in the yield stress of nanocomposites. Compared with the unfilled PP, the yield stress of the PP/PGS-2 K nanocomposites is decreased by 0.7 MPa, and the yield stress of the PP/PGS-30 K nanocomposites is enhanced by 1.4 MPa. In addition, benefiting from good dispersion, the PP/PGS-masterbatch nanocomposites with a strong matrix/particle interface not only exhibit increased Young's modulus and yield stress, but also the strain at break remains in line with the unfilled PP, which is in contrast to the conventional wisdom that the gain in modulus and strength must be at the expense of the decreased break strain. (C) 2017 Wiley Periodicals, Inc.
机译：制备三种多种聚丙烯接枝二氧化硅（PGS-2K，PGS-8K和PGS-30K），具有不同的接枝链长度。用聚丙烯（PP）混合PGS后，研究了PP / PGS界面性质和PP / PGS界面对纳米复合材料的力学性能的影响。在PP / PGS-30K纳米复合材料中观察到强基质/颗粒界面，其具有5wt％颗粒加载，与纯PP相比，玻璃化转变温度（Tg）增加了2.5℃，而观察到弱基质/粒子界面PP / PGS-2 K纳米复合材料降低Tg。基质/颗粒界面强度的变化导致纳米复合材料屈服应力的转变。与未填充的PP相比，PP / PGS-2K纳米复合材料的屈服应力降低0.7MPa，PP / PGS-30K纳米复合材料的屈服应力增强1.4MPa。此外，受益于良好的分散体，具有强基质/粒子界面的PP / PGS-母料纳米复合材料不仅具有增加的杨氏模量和屈服应力，而且断裂的应变仍然与未填充的PP符合，这相反对于常规智慧，模量和强度的增益必须牺牲减少的断裂菌株。 （c）2017 Wiley期刊，Inc。

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