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Polymers 2018, 10(8), 847;

A Study of the Pressure-Induced Solidification of Polymers

School of Physical Science and Technology, Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, Southwest Jiaotong University, Chengdu 610031, China
Author to whom correspondence should be addressed.
Received: 10 June 2018 / Revised: 22 July 2018 / Accepted: 26 July 2018 / Published: 1 August 2018
(This article belongs to the Special Issue Polymer Stereochemistry)
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By using a self-designed pressure-jump apparatus, we investigated the melt solidification behavior in the rapid compression process for poly-ethylene-terephthalate (PET), polyether-ether-ketone (PEEK), isotactic polypropylene (iPP), high-density polyethylene (HDPE), and the living polymer sulfur. The experimental results clearly show that crystallization could be inhibited, and some melts were solidified to the full amorphous state for PET, PEEK, and sulfur. Full amorphous PEEK that was 24 mm in diameter and 12 mm in height was prepared, which exceeded the size obtained by the melt quenching method. The bulk amorphous sulfur thus obtained exhibited extraordinarily high thermal stability, and an abnormal exothermic transition to liquid sulfur was observed at around 396 K. Since the solidification of melt is realized by changing pressure instead of temperature and is not essentially limited by thermal conductivity, it is a promising way to prepare fully amorphous polymers. In addition, novel properties are also expected in these polymers solidified by the pressure-jump within milliseconds. View Full-Text
Keywords: pressure jump; pressure-induced solidification; polymer; amorphous phase; mesomorphic phase pressure jump; pressure-induced solidification; polymer; amorphous phase; mesomorphic phase

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Liu, X.; Zhang, L.; Yuan, C.; Jia, R.; Shao, C.; Wang, M.; Hong, S. A Study of the Pressure-Induced Solidification of Polymers. Polymers 2018, 10, 847.

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