Polymer crystallinity and the ductile to brittle transition

被引：49

作者：

Hocker, Samuel J. A. ^{[2
,3
]}

Kim, William T. ^{[1
]}

Schniepp, Hannes C. ^{[2
]}

Kranbuehl, David E. ^{[1
]}

机构：

[1] Coll William & Mary, Dept Chem, Williamsburg, VA 23185 USA

[2] Coll William & Mary, Dept Appl Sci, Williamsburg, VA USA

[3] NASA, Langley Res Ctr, Adv Mat & Proc Branch, Hampton, VA 23665 USA

来源：

POLYMER | 2018年 / 158卷

基金：

美国国家科学基金会;

关键词：

DEGRADATION-INDUCED EMBRITTLEMENT; POLYAMIDE; 11; HYDROLYSIS; CONTINUUM;

D O I：

10.1016/j.polymer.2018.10.031

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The effects of crystallinity and molecular weight on the ductile-brittle transition of a semi-crystalline polyamide were de-coupled. Low molecular weight organic acid solutions were used to accelerate the molecular weight degradation of polyamide-11 to be faster than with water aging at 120 degrees C. The mass average molecular weight (M-m ) of the aqueous acid aged polyamide-11 (PA-11) polymerized from 11-aminodecanoic acid degraded 4 times faster in acetic and 8 times faster in butanoic acid solutions than aging in water. With accelerated M-m, degradation, crystallinity increased due to chemi-crystallizaion but at a slower rate than decreases in molecular weight. These accelerated molecular weight degradation techniques made it possible to separate the role of crystallinity from molecular weight on PA-11 ductility. This research on degradation of a semi-crystalline polyamide in acidic solutions and in water shows that reaching a critical crystallinity determines the ductile to brittle phase transition, not chain length as measured by molecular weight.

引用

页码：72 / 76

页数：5

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