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首页> 外文期刊>Journal of Applied Polymer Science >Reinforcement of polypropylene by cellulose microfibers modified with polydopamine and octadecylamine
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Reinforcement of polypropylene by cellulose microfibers modified with polydopamine and octadecylamine

机译：用聚二胺和十八烷基胺改性纤维素微纤维加固聚丙烯

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摘要

Cellulose microfibers (CMFs) having surfaces modified with polydopamine (PDPA) and octadecylamine (ODA) were prepared, and their reinforcing abilities for polypropylene (PP) were investigated. The PDPA coating was made via self-polymerization of dopamine (P-CMF), and subsequent alkylation was conducted by the reaction with ODA (OP-CMF). The modified CMFs exhibited improved dispersibility in the PP matrix due to the reduced hydrophilicity. The OP-CMF/PP composite prepared by batch mixing had a higher tensile modulus compared to that for the pure PP and composites with unmodified CMFs. However, excess alkylation lowered the tensile modulus, and the presence of an optimal degree of alkylation was demonstrated. The CMF/PP-IM composites fabricated by injection molding exhibited improved tensile properties compared to those prepared by batch mixing. Both the tensile modulus and yield stress were increased by increasing the CMF content and improved by the surface modification of the CMFs.
机译：制备了表面经聚多巴胺（PDPA）和十八胺（ODA）改性的纤维素超细纤维（CMF），并研究了其对聚丙烯（PP）的增强能力。通过多巴胺（P-CMF）的自聚合制备PDPA涂层，随后通过与ODA（OP-CMF）的反应进行烷基化。由于亲水性降低，改性CMF在PP基体中的分散性得到改善。与纯PP和未改性CMF的复合材料相比，间歇混合制备的OP-CMF/PP复合材料具有更高的拉伸模量。然而，过量烷基化降低了拉伸模量，并且证明存在最佳烷基化程度。与间歇混合法制备的CMF/PP-IM复合材料相比，注射成型制备的CMF/PP-IM复合材料具有更好的拉伸性能。随着CMF含量的增加，复合材料的拉伸模量和屈服应力都有所增加，而CMF的表面改性则改善了复合材料的拉伸模量和屈服应力。

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