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

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Crystallization and thermal performance of poly(acrylonitrile-co-alkyl acrylate) comb-like polymeric phase change materials with various side-chain lengths
CrystEngComm ( IF 2.6 ) Pub Date : 2020-07-23 , DOI: 10.1039/d0ce00929f
Hongxing Xu _{1,

2,

3,

4,

5} , Haixia Wang _{1,

2,

3,

4,

5} , Huiqin Mao _{1,

2,

3,

4,

5} , Lang Li _{1,

2,

3,

4,

5} , Haifeng Shi _{1,

2,

3,

4,

5}

Affiliation

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.

中文翻译：

具有不同侧链长度的聚（丙烯腈-丙烯酸烷基酯）梳状聚合物相变材料的结晶和热性能

一系列梳状聚（丙烯酸正烷基酯）和聚（丙烯腈-丙烯酸共丙烯酸烷基酯）相变材料（PCM），表示为PA n和PANA n，烷基碳原子的范围为n = 14至16，并且通过分别在无丙烯腈或与丙烯腈的情况下的丙烯酸正烷基酯的自由基聚合反应合成18 。通过¹ H NMR，FTIR，DSC和TGA研究了PA n和PANA n梳状PCM的结构和热性能，例如相变焓，热重复性和形状稳定性。用n从14变到18，PANA n PCM的相变温度和焓分别从26.4升高到51.4°C，从29.3升高到71.2 J g ^-1。与原始PA n相比，PANA n具有增强的形状稳定性和热稳定性由于PAN组件具有良好的支撑作用，因此可以观察到系列的PANA18，PANA18的最高形状稳定温度为240°C，在经过100个热循环后具有出色的热可靠性和结构稳定性。三点温度测量支持PANA18良好的热能存储/释放能力，并且涂有PANA18的织物具有调温效果。通过改变烷基侧链的长度而获得的良好的形状稳定性能和出色的结构稳定性证明了它们作为热管理材料的前瞻性应用。

更新日期：2020-09-14

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