聚多巴胺和氧化石墨烯改性超高分子量聚乙烯纤维膜增强CFRP的层间断裂韧性

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-13 DOI:10.1016/j.tws.2025.113990

Xuming Yao, Junzhen Chen, Guoyu Yang, Jialiang Li, Shuo Cheng, Jianjun Jiang

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引用次数: 0

摘要

碳纤维增强聚合物（CFRP）层压板由于其固有的低层间断裂韧性而容易发生分层。本研究首次研究了使用超高分子量聚乙烯纤维（PE）薄膜增强CFRP的层间断裂韧性，并探讨了聚多巴胺（PDA）和氧化石墨烯（GO）对其增韧效果的影响。采用湿铺技术制备了面密度为10 g/m2的PE、pda改性PE （PPE）和GO/ pda改性PE （GPPE）薄膜，随后通过预浸料热压工艺将其作为单向CFRP层压板的中间层。采用双悬臂梁和端缺口弯曲试验分别对cfrp的I型和II型层间断裂韧性（GIc和GIIc）进行了评估。结果表明，与未添加中间层的CFRP层压板相比，三种PE层都提高了层间断裂韧性，但GPPE层的掺入使GIc和GIc分别增加了90.7%和69.8%，增幅最大。增韧机理分析表明，PDA改性提高了PE纤维与环氧基之间的界面附着力，促进了纤维的桥接和拉拔。氧化石墨烯的引入通过额外的纳米级机制（如裂纹偏转和钉住）进一步提高了韧性，与PDA表现出协同效应。本研究提出了一种开发高韧性碳纤维复合材料的有效策略。

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Enhanced interlaminar fracture toughness of CFRP using UHMWPE fiber veils modified with polydopamine and graphene oxide

Carbon fiber-reinforced polymer (CFRP) laminates are prone to delamination due to their inherently low interlaminar fracture toughness. This study, for the first time, investigates the use of ultra-high molecular weight polyethylene fiber (PE) veils to enhance the interlaminar fracture toughness of CFRP and explores the influence of polydopamine (PDA) and graphene oxide (GO) on their toughening efficacy. PE, PDA-modified PE (PPE), and GO/PDA-modified PE (GPPE) veils with an areal density of 10 g/m² were fabricated using a wet-laying technique and subsequently introduced as interlayers in unidirectional CFRP laminates via a prepreg hot-pressing process. Mode I and Mode II interlaminar fracture toughness (G_Ic and G_IIc) of the CFRPs were evaluated using double cantilever beam and end-notched flexure tests, respectively. The results demonstrated that while all three PE veils improved the interlaminar fracture toughness compared to the pristine CFRP laminates without interlayers, the incorporation of the GPPE veil yielded the largest increase in G_Ic and G_IIc by 90.7 % and 69.8 %, respectively. Analysis of the toughening mechanisms revealed that PDA modification improved the interfacial adhesion between the PE fibers and the epoxy matrix, promoting fiber bridging and pull-out. The introduction of GO further contributed to the toughness through additional nanoscale mechanisms such as crack deflection and pinning, exhibiting a synergistic effect with PDA. This research presents an effective strategy for developing high-toughness CFRPs.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.