应用化学 ›› 2015, Vol. 32 ›› Issue (5): 535-541.DOI: 10.11944/j.issn.1000-0518.2015.05.140303

• 研究论文 • 上一篇    下一篇

长链烷酸接枝羟丙基纤维素相变材料的制备及其性能

陈曦ab,郑楠ab,刘凌志a,门永锋a*()   

  1. a中国科学院长春应用化学研究所, 高分子物理与化学国家重点实验室 长春 130022
    b
    中国科学院大学 北京 100049
  • 收稿日期:2014-09-01 修回日期:2014-09-15 接受日期:2014-11-05 出版日期:2015-05-05 发布日期:2015-05-05
  • 通讯作者: 门永锋
  • 基金资助:
     

Preparation and Characterization of Alkanoic Acid Grafted Hydroxypropyl Cellulose Phase Change Materials

CHEN Xia, b, ZHANG Nana, b, LIU Lingzhia, MEN Yongfenga, *   

  1. aState Key laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, China
    bUniversity of the Chinese Academy of Science, Beijing 100049, China
  • Received:2014-09-01 Revised:2014-09-15 Accepted:2014-11-05 Published:2015-05-05 Online:2015-05-05
  • Contact: MEN Yongfeng
  • Supported by:
     

摘要:

采用酯化的方法将具有相变特征的长链脂肪酸接枝到羟丙基纤维素主链上, 得到了一系列性能稳定, 温度范围适宜的高分子固-固相变材料, 并利用傅里叶红外光谱(FT-IR)、核磁共振(NMR)、差示扫描量热仪(DSC)、热失重分析仪(TGA)和X射线散射等技术手段对其化学结构及相变行为进行了研究。 结果表明, 该材料呈现出可逆的固-固相转变特性, 相变温度范围可通过改变脂肪酸的长度调节。 利用棕榈酸、硬脂酸和花生酸获得的相变材料焓值达到60 J/g, 所获得的材料在250 ℃以内不发生热分解。 通过将两种长链脂肪酸混合同时接枝到羟丙基纤维素主链上, 所得产物的吸/放热温度随着混合脂肪酸组分含量的变化而变化, 同时X射线散射的结果也证明羟丙基纤维素混合酯的分子间距是位于其两种单一酯之间的。这一结果为制备一定温度范围内任意相变温度的高分子固-固相变材料提供了简便的方法。

 

关键词: 羟丙基纤维素, 长链脂肪酸, 相变材料

Abstract:

A serials of hydroxypropyl cellulose esters graft copolymers with different phase change temperature was prepared. In these materials, semi-flexible hydroxypropyl celluloses serve as skeleton, and flexible alkanoic acid molecules serve as functional branch chains. The structures of the copolymers were characterized using FT-IR and NMR techniques. Their phase change properties and crystallization behavior were analyzed by DSC, TGA and X-ray scattering techniques. The results show that the temperatures at which the products absorb or release heat(melting or crystallization of the side chains) increase with the increase of side chain length. The phase change temperature of the materials can be adjusted by varying the length of the side chain. The fusion enthalpy reaches 60 J/g in case palmitic acid, stearic acid and eicosanoic acid are used. Furthermore, it is found that when mixed long-chain alkanoic acids are used as the reactant, the phase change temperatures of the products can be easily adjusted by changing the ratio of components in the mixture. This result are also proven by X-ray scattering results, the d-Spacing of hydroxypropyl cellulose mixed esters falls in between two single hydroxypropyl cellulose esters indicating that an effective grafting of both kinds of alkanoic acids on to the same hydroxypropyl cellulose chains. The results provide a facile method in preparing phase change temperature tunable polymer based solid-state phase change materials within certain temperature range.

Key words: hydroxypropyl cellulose, alkanoic acid, phase change material

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