Interfaces in polyolefin/cellulosic fiber composites: Chemical coupling, morphology, correlation with adhesion and aging in moisture
Interfaces in polyolefin/cellulosic fiber composites: Chemical coupling, morphology, correlation with adhesion and aging in moisture
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DOI：
10.1002/pc.10102
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发表时间：
1998-06-01
影响因子：
5.2
通讯作者：
Escoubes, M
中科院分区：
文献类型：
--
作者：
Gauthier, R;Joly, C;Escoubes, M
本文详细介绍了纯纤维素和木纤维与复合材料应用的热塑性基体相关时的特性。对纤维素进行化学改性以实现良好的相容性，最有效的相容剂必须具有：i)与纤维素的OH基团高度反应的功能和ii)优选具有聚合结构的非极性链。因此，用马来酸酐接枝的聚丙烯是有效的试剂。较小的相容剂，尤其是在溶胀介质中与纤维素反应时，会与纤维的体积发生反应并导致尺寸稳定性。所有处理，即使是在低接枝度或小烷基链的情况下进行，也会显着改变纤维素表面的亲水性，并在基质对纤维更好的润湿性方面发挥作用，从而改善粘附性。然后整体机械性能得到改善，但最好在单丝复合材料的规模上研究其效果。未经处理的纤维附近的基质形态表明，在某些情况下，纤维充当涉及形成跨晶相的成核剂。潮湿老化通常不利于机械性能。这种现象受到对纤维进行的化学处理的限制。
This paper details the characteristics of pure cellulose and wood fibers when associated with thermoplastic matrices for composite applications. Chemical modification of the cellulose is performed to allow a good compatibilization, and the most efficient compatibilizing agents must possess: i) a function highly reactive with the OH groups of the cellulose and ii) a non-polar chain with preferably a polymeric structure. Polypropylenes grafted with maleic anhydride are thus efficient agents. Smaller compatibilizing agents, especially if reacted with cellulose in swelling media, react with the bulk of the fiber and lead to dimensional stability. All treatments, even when performed with low degrees of grafting or small alkyl chains, significantly modify the hydrophilicity of the cellulose surface and play a role in a better wettability of the fiber by the matrix leading to improved adherence. The global mechanical properties are then improved, but the effect is preferably studied at the scale of a single filament composite. The morphology of the matrix in the vicinity of the non-treated fiber shows that, in some cases, the fiber acts as a nucleating agent involving the formation of a transcrystalline phase. Aging in moisture is generally detrimental to the mechanical properties. This phenomenon is limited by the chemical treatment performed on the fibers.