Hydrothermal Aging Mechanisms of Aramid Fibers via Synchrotron Small-Angle X-ray Scattering and Dynamic Thermal Mechanical Analysis

被引：12

作者：

Li, Chang-Sheng ^{[1
]}

Zhan, Mao-Sheng ^{[1
]}

Huang, Xian-Cong ^{[2
]}

Zhou, Hong ^{[2
]}

Li, Yan ^{[2
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing, Peoples R China

[2] Quartermaster Res Inst, Gen Logist Dept Peoples Liberat Army, Beijing, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2013年 / 128卷 / 02期

关键词：

ageing; polyamides; properties and characterization; X-ray; POLY(P-PHENYLENE TEREPHTHALAMIDE); EVOLUTION; MORPHOLOGY; ALKALINE;

D O I：

10.1002/app.38419

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 study, synchrotron small-angle X-ray scattering (SAXS) and dynamic mechanical thermal analysis (DMTA) were used to evaluate the aging behavior of microfibrils and nanovoids. The effects of such structures on the tensile strength were also investigated. We investigated the correlation length of the fibril interface by fitting the SAXS intensity using the Debye-Bueche method. The orientation and size of the voids were determined with Ruland's streak method. The results show that the correlation length decreased with aging time at 90 degrees C. Voids formed after aging at high temperatures for prolonged periods. In addition, the orientation of the 10 angstrom voids changed with the degree of degradation. DMTA results revealed a new transition temperature for the aged fibers. A model based on the SAXS and DMTA results is proposed to illustrate the hydrothermal aging mechanism. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 128: 1291-1296, 2013

引用

页码：1291 / 1296

页数：6

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