Studies on composites from wood and polypropylenes. II
Studies on composites from wood and polypropylenes. II
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木材和聚丙烯复合材料的研究。
DOI：
10.1002/app.1989.070370305
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发表时间：
1989
影响因子：
3
通讯作者：
N. Shiraishi
中科院分区：
文献类型：
--
作者：
S. Takase;N. Shiraishi
在不同的捏合条件（混炼温度、转速和混炼时间）下制备了聚丙烯（PP）或马来酸酐改性聚丙烯（MPP）与磨浆（RGP）的复合材料，并对其拉伸强度（σmax）、断裂伸长率（σ max）和杨氏模量（E）进行了评价。特别地，对于旋转速率，纤维长度分布及其原纤化与复合材料的机械性能进行了研究。研究了聚丙烯改性剂对聚丙烯性能的影响。结果表明，随着RGP含量的增加，PP的接枝改性和与RGP的亲和改性均能提高复合材料的拉伸强度，而未改性的PP-RGP复合材料的拉伸强度有所下降。MPP作为PP-RGP复合材料的增容剂也进行了评价，并且在MPP添加量仅为2.5%的情况下实现了拉伸强度的巨大改善，表明MPP可以在其体系中充当增容剂。这些证据被解释为是由于通过将MPP定位在这两个组分的界面处来改善RGP和PP之间的粘附而引起的。
Composites of polypropylene (PP) or maleic-anhydride-modified polypropylene (MPP) with refiner ground pulp (RGP) were prepared under various kneading conditions (mixing temperature, rate of rotation, and mixing time) and evaluated for their tensile strength (σmax), break elongation (ϵmax), and Young's modulus (E). Particularly, for the rate of rotation, fiber length distribution and its fibrillation were investigated in connection with mechanical properties of the composites. Also evaluated in this study was the effect of modifiers of PP on the properties. Modified PP that can be grafted or can have affinity to RGP was proved to improve the tensile strength of the molded composites as the RGP content increases, while the strength was decreased for PP–RGP composite without a modifier. MPP was also evaluated as a compatibilizer for the PP–RGP composites, and a tremendous improvement of tensile strength was achieved with MPP addition of only 2.5%, indicating that MPP can act as a compatibilizer in its system. These lines of evidence is interpreted to be caused from the improvement of the adhesion between RGP and PP through localizing MPP at the interface of these two components.