1. High-expanded foams based on novel long-chain branched poly(aryl ether ketone) via ScCO2 foaming method.
- Author
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Zhao, Jiyong, Wang, Zhipeng, Wang, Honghua, Zhou, Guangyuan, and Nie, Heran
- Subjects
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FOAM , *KETONES , *SUPERCRITICAL carbon dioxide , *PHENOLPHTHALEIN , *COPOLYMERIZATION - Abstract
Abstract In this work, a new strategy was proposed to improve the foamability of poly(aryl ether ketone) (PAEK) based on novel long-chain branched PAEK (LCB-PAEK). To improve the resin melt strength, the amorphous LCB-PAEK was fabricated via a simple ternary copolymerization of phenolphthalein, 4,4′-difluorobenzophenone, and 1,1,1-tris(4-hydroxyphenyl)ethane. To regulate the extent of reaction and avoid crosslinking, 4-fluorobenzophenone was introduced as the end-capping reagent. The presence of long-chain branches were proved by gel permeation chromatography and rheological characteristics, including storage modulus and tensile viscosity. Afterwards, the prepared LCB-PAEK samples were foamed using supercritical carbon dioxide (ScCO 2) as the blowing agent. The influence of branching content on foaming results was investigated in detail, and significant improvement in foamability was observed. By regulating the foaming parameters, the highest expansion ratio of 27.5 was achieved, which was almost ninefold higher than that of linear PAEK. In addition, the good mechanical properties indicated the promising applications of LCB-PAEK foams as high-performance structural foam. Graphical abstract Novel long-chain branched poly(aryl ether ketone) significantly improved the foamability of PAEK. Image 102347 Highlights • Novel long-chain branched PAEK was designed and synthesized for high-expanded PAEK foam. • Expansion ratio of 27.5 is the highest one for PAEK foams reported so far. • Low density PAEK foams with certain mechanical properties were firstly reported. • This work Provide a strategy for design other high-performance foams, such PES, PAR, with high-expansion ratio. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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