Facile preparation of hyperbranched polysiloxane‐grafted carbon fibers with improved interfacial strength of silicone resin composites
Facile preparation of hyperbranched polysiloxane‐grafted carbon fibers with improved interfacial strength of silicone resin composites
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DOI：
10.1002/pc.25287
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发表时间：
2019-11
影响因子：
5.2
通讯作者：
Huilin Liu;Jingxiang Liu;Guangshun Wu
中科院分区：
文献类型：
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作者：
Huilin Liu;Jingxiang Liu;Guangshun Wu
通过原位合成带有环氧基团的超支化聚硅氧烷制备新型杂化碳纤维，以提高复合材料的界面强度。通过芳基重氮反应接枝苯胺基团，然后用γ -缩水甘油氧基丙基三甲氧基硅烷溶胶-凝胶聚合得到的超支化聚硅氧烷进行改性。用拉曼光谱和X射线光电子能谱对不同碳纳米管的表面结构进行了表征，表明改性成功。引入的超支化聚硅氧烷增强了纤维的粗糙度、极性、润湿性和表面自由能。因此，与未处理的复合材料相比，聚硅氧烷改性复合材料（CF‐g‐聚硅氧烷）的界面剪切强度和冲击韧性显著提高。此外，还研究了界面增强和增韧机理，聚硅氧烷改性保持了纤维的抗拉强度。改性后抗水热老化性能的明显改善可能是由于在界面上引入了强Si - O - Si键。
New hybrid carbon fibers (CFs) were facilely prepared via in situ synthesizing hyperbranched polysiloxane with epoxy groups onto the fiber surface with the aim to enhance interfacial strength of composites. CFs were grafted with phenyl amine groups through an aryl diazonium reaction, and then modified with hyperbranched polysiloxane obtained by the sol‐gel polymerization of γ‐glycidyloxypropyltrimethoxysilane. Surface structures of different CFs were characterized by Raman spectroscopy and X‐ray photoelectron spectroscopy, indicating the successful modification. The introduced hyperbranched polysiloxane enhanced fiber roughness, polarity, wettability, and surface free energy. Hence, the interfacial shear strength and impact toughness of polysiloxane modified composites (CF‐g‐Polysiloxane) increased sharply compared with those of untreated composites. Moreover, Interfacial reinforcing and toughening mechanisms have also been studied, and polysiloxane modification maintained fiber tensile strength. The obvious improvement of anti‐hydrothermal aging behaviors after modification could be due to the introduction of strong SiOSi bonds at the interface.