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首页> 外文学位 >Automobile grade carbon fiber precursor study: I. Copolymer system and II. Terpolymer system.
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Automobile grade carbon fiber precursor study: I. Copolymer system and II. Terpolymer system.

机译：汽车级碳纤维前体研究：I.共聚物体系和II。三元共聚物系统。

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摘要

Carbon fiber is predominantly made from polyacrylonitrile (PAN) based precursors where the fibers are wet spun in the presence of hazardous solvent that also adds to the cost of production because of expensive solvent recovery and solvent recycling processes. Use of melt processable precursor for carbon fiber has long been suggested as a solution for this problem for both environmental and economic perspectives. In this study a successful method for carbon fiber preparation from melt processable acrylonitrile-co-1-vinylimidazole (AN-VIM) carbon fiber precursor is presented. The copolymers of different molecular weights were synthesized and used for extrusion, annealing, stabilization and carbonization. Positive correlations were observed when the mechanical properties of as-spun, annealed, stabilized, and carbonized fibers were compared with molecular weights of copolymers. A carbon fiber having a high tensile strength (TS) of 1.9 GPa with Young's modulus (YM) of 196 GPa was prepared from a copolymer having a weight average molecular weight (Mw) of 37 KDa. These mechanical values met the current requirement by automobile industry (TS = 1.73 GPa, YM = 173 GPa). To further reduce the cost of carbon fiber production, a new terpolymer, acrylonitrile-co-1-vinylimidazole-co methyl acrylate (AN-VIM-MA) with molar feed ratio of AN: VIM: MA = 82.0: 1.6: 16.4 was synthesized and characterized for use as a melt processable carbon fiber precursor. Compare to AN-VIM copolymer (molar feed ratio, AN: VIM = 82:18; glass transition temperature, Tg= 116ºC, char yield = 42%), the new terpolymer (Mw = 128.4 KDa) shows lower glass transition temperature, (Tg=89 ºC), high char yield (49%), UV mediated thermal stabilization and carbonization capability. Additionally, environmentally benign synthesis by using water as a solvent of AN-VIM copolymer was explored and preparation melt extruded fibers were successfully demonstrated.
机译：碳纤维主要由聚丙烯腈（PAN）基前体制成，其中纤维在存在危险溶剂的情况下进行湿纺，由于昂贵的溶剂回收和溶剂再循环过程，这也增加了生产成本。从环境和经济角度来看，长期以来一直建议将可熔融加工的前体用于碳纤维作为该问题的解决方案。在这项研究中，提出了一种由可熔融加工的丙烯腈-co-1-乙烯基咪唑（AN-VIM）碳纤维前体制备碳纤维的成功方法。合成了不同分子量的共聚物，并将其用于挤出，退火，稳定化和碳化。将初纺，退火，稳定和碳化的纤维的机械性能与共聚物的分子量进行比较时，观察到正相关。由重均分子量（Mw）为37KDa的共聚物制备具有1.9GPa的高拉伸强度（TS）和196GPa的杨氏模量的碳纤维。这些机械值满足了汽车行业的当前要求（TS = 1.73 GPa，YM = 173 GPa）。为了进一步降低碳纤维的生产成本，合成了一种新的三元共聚物，丙烯腈-共-1-乙烯基咪唑-丙烯酸甲酯（AN-VIM-MA），进料摩尔比为AN：VIM：MA = 82.0：1.6：16.4并且表征用作可熔融加工的碳纤维前体。与AN-VIM共聚物（摩尔进料比，AN：VIM = 82:18；玻璃化温度，Tg =116ºC，炭产率= 42％）相比，新型三元共聚物（Mw = 128.4 KDa）显示出较低的玻璃化温度，（ Tg = 89ºC），高炭收率（49％），紫外线介导的热稳定和碳化能力。此外，探索了以水为AN-VIM共聚物的溶剂对环境有益的合成，并成功证明了熔融挤出纤维的制备。

著录项

  • 作者

    Mahmood, Samsuddin Faisal.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Polymer chemistry.;Chemistry.;Materials science.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 170 p.
  • 总页数 170
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 康复医学;
  • 关键词

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