聚丙烯腈预氧化纤维中官能团的径向分布

IF 2.2 4区 工程技术 Q1 MATERIALS SCIENCE, TEXTILES
Panpan Xu, Junxin Tang, Yutao Liu, Ke Zhang, Changqing Li
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引用次数: 0

摘要

固态 13C-NMR 、电子探针显微分析、元素分析、纳米红外光谱、原子力显微镜和光学显微镜评估了聚丙烯腈(PAN)预氧化纤维的官能团分布和皮核结构。预氧化纤维呈现皮芯结构,皮层光密度(OD)值高,芯层光密度(OD)值低。随着热处理温度的升高,预氧化纤维的 OD 值也随之升高,这是因为形成了 C = O、C = N、C = C 以及 C = N 与 C = C 的共轭结构。随着热处理温度的升高,预氧化纤维表皮和纤维芯之间的 OD 值差异越来越明显,OD 值差异从 220 °C 时的 0.045 增加到 260 °C 时的 0.085。OD 差值与纤维中的氧元素和 C = O 官能团密切相关。预氧化纤维表皮中氧元素和 C = O 的含量高于预氧化纤维芯中的含量。在热处理温度为 260 °C 时,表皮中 C = O 的相对含量为 0.454,而纤维芯中的相对含量为 0.313,这与 OD 值的变化趋势一致。相比之下,预氧化过程中形成的 C = C 和 C = N 在纤维径向的分布并不均匀。预氧化纤维的径向不均匀性主要受羰基含量径向差异的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Radial Distribution of Functional Groups in Polyacrylonitrile Pre-oxidized Fibers

The functional group distribution and skin–core structure of polyacrylonitrile (PAN) pre-oxidized fibers have been evaluated by solid-state 13C-NMR, electron probe micro-analysis, element analysis, nano-infrared spectroscopy atomic force microscopy, and optical microscopy. The pre-oxidized fibers exhibited a skin–core structure with high optical density (OD) values in the skin and low OD values in the core. As the heat treatment temperature was increased, the OD of the pre-oxidized fibers increased, which is because of the formation of C = O, C = N, C = C, and their conjugated structures of C = N with C = C. The difference in the OD values between the pre-oxidized fiber skin and core became increasingly apparent as the heat treatment temperature increased, with the OD difference increasing from 0.045 at 220 °C to 0.085 at 260 °C. The OD difference is closely related to the oxygen element and C = O functional groups in the fiber. The contents of the oxygen element and C = O in the pre-oxidized fiber skin were higher than those in the pre-oxidized fiber core. At a heat treatment temperature of 260 °C, the relative content of C = O in the skin was 0.454, whereas that in the core was 0.313, which was consistent with the trend of the OD value change. In comparison, C = C and C = N formed during pre-oxidation were not substantially distributed in the radial direction of the fibers. The radial inhomogeneity of the pre-oxidized fiber was mainly affected by the radial difference of the carbonyl content.

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来源期刊
Fibers and Polymers
Fibers and Polymers 工程技术-材料科学:纺织
CiteScore
3.90
自引率
8.00%
发文量
267
审稿时长
3.9 months
期刊介绍: -Chemistry of Fiber Materials, Polymer Reactions and Synthesis- Physical Properties of Fibers, Polymer Blends and Composites- Fiber Spinning and Textile Processing, Polymer Physics, Morphology- Colorants and Dyeing, Polymer Analysis and Characterization- Chemical Aftertreatment of Textiles, Polymer Processing and Rheology- Textile and Apparel Science, Functional Polymers
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