Jilin Provincial Laboratory of Carbon Fiber and Composites, Jilin Province Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, China.
College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China.
Int J Biol Macromol. 2024 Sep;276(Pt 1):133877. doi: 10.1016/j.ijbiomac.2024.133877. Epub 2024 Jul 14.
The adhesive strength between the sizing agent and carbon fiber (CF) plays a crucial role in improving the interfacial properties of composites, while such a vital aspect has been consistently disregarded. In this study, a hyperbranched waterborne polyurethane (HWPU) sizing agent was synthesized from biogenetically raw materials including gallic acid, l-Lysine diisocyanate and amylopectin. Concurrently, hydrogen-bonded cross-linked network structures were established utilizing a botanical polyphenol tannin as coupling agent to effectively connect CF with HWPU. This meticulous process yielded CF/nylon 6 composites with improved properties and their mechanical characteristics were systematically investigated. The findings showcased a noteworthy boost in flexural strength and interlaminar shear strength (ILSS), showing enhancements of 54.6 % and 61.4 %, respectively, surpassing those of untreated CF. Furthermore, the interfacial shear strength (IFSS) test indicated a remarkable 70.3 % improvement. This approach presents a highly promising concept aimed at developing sustainable green waterborne polyurethane sizing agent and improving the interfacial performance of CF composite materials.
上浆剂与碳纤维（CF）之间的黏附强度对于改善复合材料的界面性能至关重要，而这一至关重要的方面一直被忽视。在这项研究中，从生物基原料（包括没食子酸、L-赖氨酸二异氰酸酯和支链淀粉）合成了超支化水性聚氨酯（HWPU）上浆剂。同时，利用植物多酚单宁作为偶联剂，建立了氢键交联网络结构，有效地将 CF 与 HWPU 连接起来。通过这一精细的过程，制备了 CF/尼龙 6 复合材料，其性能得到了改善，并对其力学性能进行了系统研究。研究结果表明，弯曲强度和层间剪切强度（ILSS）分别显著提高了 54.6%和 61.4%，超过了未处理 CF 的强度。此外，界面剪切强度（IFSS）测试表明，其性能提高了 70.3%。该方法提出了一个很有前景的概念，旨在开发可持续的绿色水性聚氨酯上浆剂，改善 CF 复合材料的界面性能。
