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摘要
以国产聚丙烯腈基高强中模型原丝为研究对象,采用广角X射线衍射仪和万能材料试验机,考察了其在预氧化过程中微晶结构演变规律以及所制碳纤维的结构和性能。结果表明:随着预氧化温度的升高,预氧化纤维的微晶尺寸先增大再减小;在210℃条件下,纤维微晶长度由5.50nm增大至7.60nm,增加了38.2%;当温度达到260℃时,纤维微晶长度降至2.60nm,降低了52.7%。预氧化纤维芳构化指数由210℃时的22.1%提高至260℃时的67.2%,提高了2.4倍。所得碳纤维的微晶堆砌尺寸和微晶长度分别为2.5nm和3.1nm,微晶层间距为0.3487nm,孔含量为15.85%(体积分数),拉伸强度为5.75GPa,拉伸模量为294GPa。
Abstract
Polyacrylonitrile (PAN) based fiber with high strength and middle modulus was studied.Microcrystalline structure transformation during preoxidation,the structure and properties of carbon fiber were investigated by universal material testing machine and wide angle X-ray diffraction (WXRD).It was found that crystallite size increased first and then decreased with increasing of preoxidation temperature.Under 210℃,the crystallite size increased from 5.50nm to 7.60nm,increased by 38.2%.When the temperature reached 260℃,the crystallite size reduced to 2.60nm,was reduced by 52.7%.Aromatization index (AI) rose from 22.1% at 210℃ to 67.2% at 260℃,increased by 2.4 times.The crystallite size of Lc and La of carbon fiber were 3.1nm and 2.5nm,microcrystalline d002 layer spacing 0.3487nm,hole content 15.85%,the tensile strength 5.75GPa,tensile modulus 294GPa.
关键词
高强中模型纤维
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微晶尺寸
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孔含量
Key words
fiber with high strength and middle modulus
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crystallite size
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hole content
预氧化过程中PAN基高强中模型纤维微晶结构分析及力学性能研究[J].
化工新型材料, 2018, 46(11): 92-95 DOI:
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