The influence of the addition position of cellulose nanofibers on the crystalline and mechanical properties of carbon fiber-reinforced polypropylene composites
The influence of the addition position of cellulose nanofibers on the crystalline and mechanical properties of carbon fiber-reinforced polypropylene composites
复制标题
DOI：
10.1080/09276440.2021.2007720
复制
发表时间：
2022-09
影响因子：
2.6
通讯作者：
Koki Matsumoto;K. Takemura
中科院分区：
文献类型：
--
作者：
Koki Matsumoto;K. Takemura
摘要在传统的微米纤维增强塑料复合材料中引入纳米填料，对提高复合材料的断裂韧性和结晶性能，特别是对半结晶热塑性聚合物，具有很大的潜力。虽然纳米填料的加入可以实现选择性增强，但纳米填料的加入位置对力学性能和结晶性能的影响尚未得到揭示。在这项工作中，纤维素纳米纤维（CNF）作为第二填料添加（i）到聚丙烯（PP）基体通过熔融混合过程和（ii）到碳纤维（CF）表面通过浸涂过程中的CF-增强PP复合材料。通过偏光显微镜、差示扫描量热仪、X射线衍射仪和三点弯曲试验研究了碳纤维周围的横晶结构对界面强度的影响。我们发现，（i）CNF加入到PP基体中扰乱了CF周围的transcyclozation，力学性能略有下降。相反，（ii）CNF除了到CF表面上促进transcyclozation周围的CF，和弯曲屈服强度和模量显着提高了最大的30%和63%，分别。图形摘要
ABSTRACT The introduction of nanofillers into conventional microsized fiber-reinforced plastic composites has great potential to improve the fracture toughness and crystalline properties of composites, especially for semicrystalline thermoplastic polymers. Although the selective reinforcement is possible by nanofiller addition, the influence of the addition position of nanofillers on the mechanical properties and crystalline properties still has not been revealed. In this work, the cellulose nanofibers (CNFs) as the secondary filler were added (i) into a polypropylene (PP) matrix by a melt-mixing process and (ii) onto a carbon fiber (CF) surface by a dip-coating process in a CF-reinforced PP composite. By focusing on the transcrystals surrounding CFs, which enable improvement of the interfacial strength, the crystalline properties and mechanical properties were investigated through polarized optical microscopy, differential scanning calorimetry, X-ray diffraction, and 3-point bending tests in this study. We revealed that (i) CNF addition into the PP matrix disturbed the transcrystallization surrounding CFs and that the mechanical properties slightly decreased. Conversely, (ii) CNF addition onto the CF surface promoted transcrystallization surrounding the CF, and the flexural yield strength and modulus significantly improved by a maximum of 30% and 63%, respectively. GRAPHICAL ABSTRACT