Crystallization and thermal performance of poly(acrylonitrile-co-alkyl acrylate) comb-like polymeric phase change materials with various side-chain lengths

CrystEngComm Pub Date: 2020-07-23 DOI: 10.1039/D0CE00929F

Abstract

A series of comb-like poly(n-alkyl acrylate) and poly(acrylonitrile-co-alkyl acrylate) phase change materials (PCMs), denoted as PAn and PANAn, with alkyl carbon atoms varying from n = 14 to 16 and 18, are synthesized through the free-radical polymerization of n-alkyl acrylates without or with acrylonitrile, respectively. Structure and thermal properties such as phase change enthalpy, thermal repeatability and shape stability of the PAn and PANAn comb-like PCMs were investigated by 1H NMR, FTIR, DSC, and TGA. With n changing from 14 to 18, the phase change temperature and enthalpy of the PANAn PCMs increase from 26.4 to 51.4 °C and from 29.3 to 71.2 J g?1, respectively. Compared to those of pristine PAn, an enhanced shape-stabilization performance and thermal stability of the PANAn series are observed owing to the good support role of the PAN component, and PANA18 shows the maximum form-stable temperature of 240 °C followed by an excellent thermal reliability and structure stabilization after 100 thermal cycles. Three-point temperature measurement supports the good thermal energy storage/release capability of PANA18, and fabric coated with PANA18 gives a thermoregulated effect. The good shape-stabilized performance and excellent structural stability tuned by varying the alkyl side-chain lengths demonstrate their prospective application as thermal management materials.

Graphical abstract: Crystallization and thermal performance of poly(acrylonitrile-co-alkyl acrylate) comb-like polymeric phase change materials with various side-chain lengths
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