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用于碳纤维前驱体的高分子量聚（丙烯腈-2-亚甲基琥珀酰胺酸）的制备与稳定化

Preparation and Stabilization of High Molecular Weight Poly (acrylonitrile--2-methylenesuccinamic acid) for Carbon Fiber Precursor.

作者信息

Zhang Shuxian, Dang Yanjin, Ni Xuepeng, Yuan Chunshun, Chen Huifang, Ju Anqi

机构信息

Shanghai Key Laboratory of Lightweight Composite, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

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

出版信息

Polymers (Basel). 2021 Nov 9;13(22):3862. doi: 10.3390/polym13223862.

DOI:10.3390/polym13223862
PMID:34833160
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8618359/
Abstract

Bifunctional comonomer 2-methylenesuccinamic acid (MLA) was designed and synthesized to prepare acrylonitrile copolymer P (AN--MLA) using mixed solvent polymerization as a carbon fiber precursor. The effect of monomer feed ratios on the structure and stabilization were characterized by elemental analysis (EA), Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), X-ray diffraction (XRD), proton nuclear magnetic (H NMR), and differential scanning calorimetry (DSC) for the P (AN--MLA) copolymers. The results indicated that both the conversion and molecular weight of polymerization reduce gradually when the MLA content is increased in the feed and that bifunctional comonomer MLA possesses a larger reactivity ratio than acrylonitrile (AN). P (AN--MLA) shows improved stabilization compared to the PAN homopolymer and poly (acrylonitrile-acrylic acid-methacrylic acid) [P (AN-AA-MA)], showing features such as lower initiation temperature, smaller cyclic activation energy, wider exothermic peak, and a larger stabilization degree, which are due to the ionic cyclization reaction initiated by MLA, confirming that the as-prepared P (AN--MLA) is the potential precursor for high-performance carbon fiber.

摘要

设计并合成了双功能共聚单体2-亚甲基琥珀酰胺酸（MLA），采用混合溶剂聚合法制备了丙烯腈共聚物P（AN-MLA）作为碳纤维前驱体。通过元素分析（EA）、傅里叶变换红外光谱（FTIR）、凝胶渗透色谱（GPC）、X射线衍射（XRD）、质子核磁共振（H NMR）和差示扫描量热法（DSC）对P（AN-MLA）共聚物的单体进料比与结构和稳定性之间的关系进行了表征。结果表明，随着进料中MLA含量的增加，聚合反应的转化率和分子量逐渐降低，且双功能共聚单体MLA的竞聚率大于丙烯腈（AN）。与PAN均聚物和聚（丙烯腈-丙烯酸-甲基丙烯酸）[P（AN-AA-MA）]相比，P（AN-MLA）的稳定性有所提高，表现出起始温度较低、循环活化能较小、放热峰较宽以及稳定程度较大等特点，这是由于MLA引发的离子环化反应所致，证实了所制备的P（AN-MLA）是高性能碳纤维的潜在前驱体。

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