石墨烯增强超高分子量聚乙烯纤维

IF 2.6 4区 化学 Q3 POLYMER SCIENCE
ZhiJing Xue, Kenneth R. Brown, Timothy M. Harrell, Xiaodong Li
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引用次数: 0

摘要

热塑性聚合物由于其轻量化和可成形性,越来越多地应用于电动汽车、氢燃料电池汽车和其他脱碳应用。需要更高强度的聚合物来取代车辆结构中的金属,从而减少质量并提高效率。超高分子量聚乙烯(UHMWPE)纤维是技术聚合物中强度重量比最高的纤维之一,通过石墨烯等纳米填料的增强进一步改进,将扩大其性能范围。在这项工作中,UHMWPE/石墨烯纳米复合纤维是凝胶纺丝的,并对其形态、微观结构、热学和力学性能进行了表征。少量石墨烯的加入使纤维的拉伸强度提高了25%,拉伸模量提高了32%。差示扫描量热法表明,石墨烯的加入改善了分子链的配位性,提高了熔融温度和结晶度。钢筋对纤维的截面形状也有影响;随着石墨烯含量的增加,纤维椭圆形状的纵横比下降,表明石墨烯纳米填料在聚合物基体中的骨架效应。石墨烯的增强效应在阈值浓度以上下降,并应用理论模型证明团块增加导致性能降低。这项工作展示了一种简单、有效的方法来生产石墨烯增强超高分子量聚乙烯纤维,并为理解利用石墨烯形成用于无数工程应用的超高性能纳米复合纤维的潜力奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Graphene reinforced UHMWPE fibers

Graphene reinforced UHMWPE fibers

Thermoplastic polymers are increasingly used in electric vehicles, hydrogen fuel cell vehicles, and other decarbonization applications due to their lightweight and formability. Higher-strength polymers are needed to supplant metals in the vehicle structure, thereby reducing mass and improving efficiency. Ultra-high molecular weight polyethylene (UHMWPE) fibers possess one of the highest strength-to-weight ratios of technical polymers, and further improvement via reinforcement by nanofillers, such as graphene, will expand their performance envelope. In this work, UHMWPE/graphene nanocomposite fibers were gel spun and characterized for their morphological, microstructural, thermal, and mechanical properties. The addition of a low fraction of graphene improved the tensile strength of the fibers by 25% and tensile modulus by 32%. Differential scanning calorimetry showed an increase in melting temperature and degree of crystallinity, which indicates improved coordination of the molecular chains induced by the addition of graphene. The reinforcement also affected the cross-sectional shape of the fibers; the aspect ratio of the fibers’ elliptical shape declined with increasing graphene content showing the skeletal effect of the graphene nanofillers in the polymer matrix. The reinforcing effect of graphene declined above a threshold concentration, and theoretical modeling was applied to demonstrate that increased agglomerates led to reduced properties. This work demonstrates a simple, effective method to produce graphene-reinforced UHMWPE fibers and lays a foundation for understanding the potential for leveraging graphene to form ultra-high-performance nanocomposite fibers for myriad engineering applications.

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来源期刊
Journal of Polymer Research
Journal of Polymer Research 化学-高分子科学
CiteScore
4.70
自引率
7.10%
发文量
472
审稿时长
3.6 months
期刊介绍: Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology, including: polymer synthesis; polymer reactions; polymerization kinetics; polymer physics; morphology; structure-property relationships; polymer analysis and characterization; physical and mechanical properties; electrical and optical properties; polymer processing and rheology; application of polymers; supramolecular science of polymers; polymer composites.
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