Interphase effects on the mechanical and physical aspects of natural fiber composites
Interphase effects on the mechanical and physical aspects of natural fiber composites
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DOI：
10.1002/(sici)1522-9505(19991201)272:1
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发表时间：
1999-12
期刊：
影响因子：
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通讯作者：
D. Caulfield;Daan Feng;S. Prabawa;R. Young;A. Sanadi
中科院分区：
文献类型：
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作者：
D. Caulfield;Daan Feng;S. Prabawa;R. Young;A. Sanadi
纤维与基体之间的相互作用和粘附对纤维复合材料的力学和物理行为有重要影响。界面和界面相的作用取决于几个因素，如化学组成（官能团）、分子结构特征（分支、分子量分布、交联）以及其物理状态的细节（高于或低于Tg、性质和结晶度）。天然纤维具有复杂多变的化学结构，表面形貌不均匀。这给使用单纤维复合材料测试准确评估界面抗剪强度带来了困难，除非进行比较。本文综述了近年来天然纤维复合材料间相研究进展。当使用偶联剂时，天然纤维增强复合材料的拉伸和弯曲强度显著提高。然而，在模的情况下，结果更复杂。对于两种乙烯-丙烯冲击共聚物，不耦合体系的杨氏模量明显高于耦合体系。在50℃左右的温度下，未偶联的冲击聚合物的动态存储模量高于偶联的复合材料。在较高的温度下，偶联剂的存在导致较高的存储模量。透结晶性可能在这一现象中起重要作用。蠕变和其他长期性能也受到间相质量的影响，尽管改善水平随着基质聚合物分子量的增加而降低。偶联剂降低了吸水率，偶联剂浓度越高，对模量的影响越小。
The interaction and adhesion between the fiber and matrix has a significant effect in determining the mechanical and physical behavior of fiber composites. The effect of the interface and interphase depends on several factors such as chemical composition (functional groups), molecular structure characteristics (branching, molecular weight distribution, cross-linking), and details of its physical state (above or below Tg, nature and degree of crystallinity). Natural fibers have complex and varying chemical structures that have uneven surface topographies. This creates difficulties in using single fiber composite testing to accurately evaluate the interfacial shear strengths, except for comparisons. A review of our interphase related research in natural fiber composites is presented. When using coupling agents it is well known that the tensile and flexural strengths increase dramatically in natural fiber reinforced composites. However, in the case of modulus, the results are more complex. For two ethylene-propylene impact copolymers, the uncoupled systems had much higher Young's moduli than the coupled systems. The dynamic storage moduli of the uncoupled impact polymers were higher than the coupled composites at temperatures up to about 50°C. At higher temperatures the presence of the coupling agent resulted in higher storage moduli. Transcrystallinity may play an important role in this phenomenon. Creep and other long-term properties are also affected by the quality of the interphase, although the level of improvement decreases with an increase in the molecular weight of the matrix polymer. Coupling agents reduced the rate of water absorption and the moduli were less affected in blends with a higher concentration of coupling agents.