Lei Han,Haifeng Cai,Xu Chen,Cheng Zheng,Weihong Guo
Ultra-high molecular weight polyethylene (UHMWPE)/epoxy composites with excellent adhesive properties were prepared by forming an interface membrane on the UHMWPE fiber surface. The interface membrane of the UHMWPE fiber and epoxy resin was polymerized by an aldol condensation between polyvinyl alcohol (PVA) and glutaraldehyde. Different surface treatment methods of UHMWPE fibers were optimized and the two-step PVA-glutaraldehyde condensation (Corona-PG-2S) method is the best. The interfacial adhesion between UHMWPE fiber and epoxy resin was enhanced, and the adhesive properties of the composite were improved. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrum (EDS) results of the fiber treated by Corona-PG-2S shows that the surface oxygen content was up to 25.0 wt %, with an increase of 17.3 wt % compared with the surface oxygen content of unmodified UHMWPE fiber, which indicated that the surface polarity was greatly enhanced. The adhesive properties were improved by improving the polarity of the surface. The peel strength, ultimate cohesive force, tensile strength and flexural strength of the composite treated by Corona-PG-2S were greatly increased to 262.8%, 166.9%, 139.7%, 200.6% compared with those of unmodified samples. The composite prepared by Corona-PG-2S had excellent adhesive properties, demonstrating that the Corona-PG-2S method plays a major role in significantly improving the composite adhesive properties.Keywords:UHMWPE fiber;epoxy resin;PVA;adhesive property;aldol condensation
Lijie Yin,Wei Li,Yichen Lu,Yang Meng,Ming Tian,Nanying Ning,Wencai Wang
To enhance the interfacial adhesion between ultra-high molecular weight polyethylene (UHMWPE) fibers and rubber, a novel environmentally friendly low-temperature dipping system was developed. This system involves reacting polyethylene glycol, butanone oxime-capped hexamethylene diisocyanate, and a cross-linking agent to form a network structure, which is then blended with latex to create a polypolyol-isocyanate-latex (PIL) dipping solution. Initially, the UHMWPE fiber surface was activated using continuous plasma treatment, serving as an alternative to traditional activation solution. Subsequently, the fibers were dipped by the PIL solution. The H pull-out force between the modified UHMWPE fibers and rubber increased by 114 % to 137.6 N, outperforming the conventional resorcinol–formaldehyde-latex (RFL) system. In addition, the PIL system avoids the use of toxic resorcinol and formaldehyde and can cure at lower temperatures, making it more suitable for UHMWPE fibers with low melting points. The modified UHMWPE fiber/rubber composites also exhibited good aging and fatigue stability. This method is characterized by its simplicity, minimal damage to the fibers, and advantages in continuity and scalability, offering new guidance for the interface design of UHMWPE fiber/rubber composites.
Kui Wang,Lu Shen,Qixuan Zhu,Rouyu Bo,Rong Lu,Xiaoshu Lu,Zixuan Fu
A type of MXene nanosheets with “organic–inorganic” structure was constructed through chemical reactions of 3-aminopropyltriethoxysilane and ethylene glycol diglycidyl ether on MXene surface to improve the interfacial and mechanical properties of ultrahigh-molecular weight polyethylene (UHMWPE) fiber-reinforced epoxy composite. The soft “organic” portion was conducive to good dispersion of epoxy-modified MXene nanosheets (M−MXene) in epoxy resin, whereas the “inorganic” part guaranteed the excellent mechanical performance of M−MXene. Then, M−MXene nanosheets were added into the epoxy matrix or deposited onto the surface of modified UHMWPE fibers to investigate the effect of M−MXene on composites’ properties. Results indicated the introduction of M−MXene could increase friction force and mechanical interlocking, produce excellent wettability with epoxy matrix, and form chemical bonds with the curing agent. Then, reduced stress concentration and complicated crack path were formed due to the unique “organic–inorganic” structure. Compared with UHMWPE/Epoxy, UHMWPE-PAS@M−MXene/Epoxy and UHMWPE-PAS/Epoxy@M−MXene illustrated significant improvements of 39% and 56%, respectively, in tensile strength and 311% and 324%, respectively, in interfacial shear strength (IFSS). Improved mechanical and interfacial properties of UHMWPE-PAS/Epoxy@M−MXene were attributed to the uniform distribution of M−MXene in the epoxy matrix, which generated a longer crack path from fiber to matrix and more crack deflections compared with those of UHMWPE-PAS@M−MXene/Epoxy.
危险品化学品经营许可证（带存储）