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超临界二氧化碳中循环反应过程中PAN纤维结构与性能变化的研究

Study on the Changes of Structures and Properties of PAN Fibers during the Cyclic Reaction in Supercritical Carbon Dioxide.

作者信息

Qiao Mengmeng, Kong Haijuan, Ding Xiaoma, Hu Zhifeng, Zhang Luwei, Cao Yuanzhi, Yu Muhuo

机构信息

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

School of Materials Engineer, Shanghai University of Engineer Science, Shanghai 201620, China.

出版信息

Polymers (Basel). 2019 Mar 1;11(3):402. doi: 10.3390/polym11030402.

DOI:10.3390/polym11030402
PMID:30960385
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6473386/
Abstract

Thermal pre-oxidation of polyacrylonitrile (PAN) fibers is a time-consuming and energy-consuming step in the production of PAN-based carbon fibers. In this paper, the effect of temperature on the structures and properties of PAN fibers cyclized in the supercritical carbon dioxide (Sc-CO₂) medium was studied. The thermal behaviors of the PAN fibers were investigated by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). The cyclization reaction was sensitive to the heating temperature and gas atmosphere. The FT-IR results of the PAN fibers treated in the Sc-CO₂ confirmed that the degree of cyclization increased with the increase of the cyclization temperature. Compared with the PAN fibers treated in the air, the PAN fibers treated in the Sc-CO₂ showed a higher degree of cyclization even at the same temperature. These findings might be related to the osmotic action of Sc-CO₂ causing the fibers to be further arranged in a regular manner, which was favorable for the cyclization reaction. Moreover, as one kind of high diffusion and high heat transfer media, the heat release during the cyclization of PAN fibers could be quickly removed by Sc-CO₂, which achieved the progress of the rapid-entry cyclization reaction.

摘要

聚丙烯腈（PAN）纤维的热预氧化是制备PAN基碳纤维过程中耗时且耗能的步骤。本文研究了温度对在超临界二氧化碳（Sc-CO₂）介质中环化的PAN纤维结构和性能的影响。通过傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、差示扫描量热仪（DSC）和热重分析（TGA）研究了PAN纤维的热行为。环化反应对加热温度和气体气氛敏感。在Sc-CO₂中处理的PAN纤维的FT-IR结果证实，环化度随环化温度的升高而增加。与在空气中处理的PAN纤维相比，即使在相同温度下，在Sc-CO₂中处理的PAN纤维也显示出更高的环化度。这些发现可能与Sc-CO₂的渗透作用使纤维进一步规则排列有关，这有利于环化反应。此外，作为一种高扩散和高传热介质，Sc-CO₂可以快速去除PAN纤维环化过程中释放的热量，从而实现快速进入环化反应的进程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/2f3bdfcb75ef/polymers-11-00402-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/3da55175a9a3/polymers-11-00402-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/36e38f5bdc28/polymers-11-00402-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/bc4b8ae3482d/polymers-11-00402-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/6f3542560f07/polymers-11-00402-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/4bf64aac970c/polymers-11-00402-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/30cf246de8e1/polymers-11-00402-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/32d64ca0551f/polymers-11-00402-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/7981bdf023f4/polymers-11-00402-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/2f3bdfcb75ef/polymers-11-00402-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/dc848984324c/polymers-11-00402-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/d53b9e517993/polymers-11-00402-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/a63156c0298c/polymers-11-00402-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/3da55175a9a3/polymers-11-00402-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/36e38f5bdc28/polymers-11-00402-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/bc4b8ae3482d/polymers-11-00402-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/6f3542560f07/polymers-11-00402-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/4bf64aac970c/polymers-11-00402-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/30cf246de8e1/polymers-11-00402-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/32d64ca0551f/polymers-11-00402-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/7981bdf023f4/polymers-11-00402-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/767b/6473386/2f3bdfcb75ef/polymers-11-00402-g012.jpg

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