Study on the relationship between chemical structure transformation and morphological change of polyacrylonitrile based preoxidized fibers

被引：18

作者：

Wang, Yuxia ^{[1
,2
]}

Wang, Chengguo ^{[1
,2
]}

Gao, Quan ^{[1
,2
]}

Wang, Yanxiang ^{[1
,2
]}

Zhao, Shengyao ^{[1
,2
]}

Cui, Bowen ^{[1
,2
]}

Yue, Yang ^{[1
,2
]}

机构：

[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, State Key Lab Crystal Mat, Jinan 250061, Peoples R China

[2] Shandong Univ, Carbon Fiber Engn Res Ctr, Sch Mat Sci & Engn, Jinan 250061, Peoples R China

来源：

EUROPEAN POLYMER JOURNAL | 2021年 / 159卷 / 159期

关键词：

Polyacrylonitrile; Preoxidized fibers; Chemical structure; Morphology; Ultrathin section; STABILIZATION REACTION; THERMAL STABILIZATION; CARBON-FIBERS; INHOMOGENEITY; OXIDATION; EVOLUTION; OXYGEN; PAN; IR;

D O I：

10.1016/j.eurpolymj.2021.110742

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this work, a new research perspective on the relationship between chemical structure transformation and morphological change of polyacrylonitrile (PAN) precursors during the preoxidized process was provided. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) were used to analyze the morphologies of preoxidized fibers. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermal gravimetry (TG) were used to characterize the chemical structure, crystal structure and thermal properties, respectively. The chemical structure and morphology of the same region of the fiber were obtained together by nano infrared spectroscopy atomic force microscope (NanoIR2-FS), which was convenient to study the relationship between them. The results showed that the difference of chemical structure between the skin and core region increased in the early stages of preoxidation and decreased in the late stages of preoxidation. The change of morphology was consistent with the chemical structure. Microfibrils along the fiber axis and lamella structures perpendicular to the fiber axis were observed, and the morphology became denser due to the transformation of chemical structure. In addition, the cross-sectional fracture morphologies of the preoxidized fibers changed and the crystallization degree of the preoxidized fibers decreased.

引用

页数：9

共 34 条

[1] Chemical structure based prediction of PAN and oxidized PAN fiber density through a non-linear mathematical model [J].

Badii, Khashayar ;

Church, Jeffrey S. ;

Golkarnarenji, Gelayol ;

Naebe, Minoo ;

Khayyam, Hamid .

POLYMER DEGRADATION AND STABILITY, 2016, 131 :53-61

[2] A CRITICAL-REVIEW OF THE STABILIZATION OF POLYACRYLONITRILE [J].

BASHIR, Z .

CARBON, 1991, 29 (08) :1081-1090

[3] MECHANISM OF FATIGUE FAILURE IN NYLON FIBRES [J].

BUNSELL, AR ;

HEARLE, JWS .

JOURNAL OF MATERIALS SCIENCE, 1971, 6 (10) :1303-&

[4] Low-temperature thermal stabilization of polyacrylontrile-based precursor fibers towards efficient preparation of carbon fibers with improved mechanical properties [J].

Chai, Xiaoyan ;

Mi, Hongwei ;

Zhu, Caizhen ;

He, Chuanxin ;

Xu, Jian ;

Zhou, Xuechang ;

Liu, Jianhong .

POLYMER, 2015, 76 :131-139

[5] New insights into orientation differences between skin and core regions of polyacrylonitrile fibers during pre-stabilization with the stretching process [J].

Chen, Liang ;

Liu, Jie ;

Chen, Jing ;

Li, Xiang ;

Zhao, Zehua ;

Wang, Xiaoxu .

POLYMER, 2020, 210

[6] Evolution of structural inhomogeneity in polyacrylonitrile fibers by oxidative stabilization [J].

Choi, Jiwon ;

Kim, Sung -Soo ;

Chung, Yong-Sik ;

Lee, Sungho .

CARBON, 2020, 165 :225-237

[7] The effect of processing on the structure and properties of carbon fibers [J].

Edie, DD .

CARBON, 1998, 36 (04) :345-362

[8] Carbon Fibers: Precursor Systems, Processing, Structure, and Properties [J].

Frank, Erik ;

Steudle, Lisa M. ;

Ingildeev, Denis ;

Spoerl, Johanna M. ;

Buchmeiser, Michael R. .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2014, 53 (21) :5262-5298

[9]

Fu ZY, 2018, J APPL POLYM SCI, V135, DOI [10.1002/APP.45934, 10.1002/app.45934]

[10] From Microfibrillar Network to Lamellae during the Coagulation Process of Polyacrylonitrile Fiber: Visualization of Intermediate Structure Evolution [J].

Gao, Quan ;

Jing, Min ;

Zhao, Shengyao ;

Wang, Yuxia ;

Qin, Jianjie ;

Yu, Meijie ;

Wang, Chengguo .

MACROMOLECULES, 2020, 53 (19) :8663-8673

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