Influence of thermal history on the mechanical properties of poly(ether ketone ketone) copolymers

被引：10

作者：

Choupin T. ^{[1
,2
]}

Debertrand L. ^{[1
]}

Fayolle B. ^{[1
]}

Régnier G. ^{[1
]}

Paris C. ^{[2
]}

Cinquin J. ^{[2
]}

Brulé B. ^{[3
]}

机构：

[1] Laboratoire PIMM, Arts et Métiers, CNRS, Cnam, HESAM Université, Paris

[2] Department of Composites Materials, Airbus Group Innovations, Suresnes

[3] Arkema, Cerdato, Serquigny

来源：

Polymer Crystallization | 2019年 / 2卷 / 06期

关键词：

crystallinity; mechanical properties; PEKK;

D O I：

10.1002/pcr2.10086

中图分类号：

学科分类号：

摘要：

Since poly(ether ketone ketone) (PEKK) is a good candidate as a matrix for composite structural parts, the mechanical properties of PEKK copolymers prepared from diphenyl ether, terephthalic acid (T), and isophthalic acid (I) with different T/I ratios were assessed at room temperature and above their glass transition temperature depending on the thermal history during processing. The influence of cooling conditions and macromolecular modifications at high exposure temperatures was investigated. Results show that modulus and yield properties for a given testing temperature follow a master curve driven mainly by crystallinity regardless of the PEKK copolymers. By modifying PEKK during exposures at 400°C, which leads to branching mechanisms before crystallization, it is shown that modified PEKKs follow the master curve, thus confirming the predominant role of crystallinity in small deformation properties. However, for some morphologies, depending on the crystallization conditions such as cold or melt crystallization, a slight deviation is observed from the global master curve. © 2019 Wiley Periodicals, Inc.

引用

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