Preparation and properties of MWNT/polyvinyl butyral composite phase change fibers

doi:10.16085/j.issn.1000-6613.2015.10.026

Abstract

Abstract: Core-sheath multi-walled carbon nanotube/polyvinyl butyral(MWNT/PVB) composite phase change fibers are successfully prepared by microfluidic technology, which are composed of paraffin (RT27) as core and PVB blended with MWNT as sheath. The effect of MWNT content on the morphology, mechanical properties, thermal properties, and conductive properties of MWNT/PVB composite phase change fibers is systematically investigated. The results show that the mechanical properties and heat conductive properties of MWNT/PVB fibers have improved significantly by adding the MWNT in PVB fiber matrix. The tensile strength of MWNT/PVB composite fibers firstly increases and then decreases with the increase of MWNT content. When MWNT content is 0.5%, the tensile strength of MWNT/PVB composite fibers reaches the maximum and increases by 28.27% than that of the phase change fibers without MWNT. At 42℃, the inner temperature of model hat twined by MWNT/PVB fibers with 4% of MWNT to PVB raises faster than that of the model hat with PVB phase change fibers. The duration time of the former reduces by 25% compared with the latter when the inner temperatures of two model hats reach the melting point of RT27 (27℃) from the same initial temperature (17℃). The results provide a valuable guidance for the preparation of phase change fibers with satisfactory heat conduction properties, mechanical properties as well as stable and fast thermal regulation properties.

Key words: microfluidics, phase change, enthalpy, fibers, conductive properties

摘要： 利用微流控技术成功制备了以石蜡(RT27)为芯层、共混多壁碳纳米管(MWNT)的聚乙烯醇缩丁醛(PVB)为鞘层的核-鞘型MWNT/PVB 复合相变纤维。系统研究了MWNT 的含量对复合相变纤维的形貌、力学性能、热性能、导热性能的影响。研究结果表明,MWNT 的加入显著提高了MWNT/PVB 复合相变纤维的力学性能和导热性能。随着MWNT 含量增加,MWNT/PVB 复合相变纤维的断裂强度先增大后减小。当MWNT 含量为0.5%时,复合相变纤维的断裂强度最大,比未添加MWNT 相变纤维的断裂强度提高了28.27%。在42℃高温下,比较缠绕MWNT 含量为4%的复合相变纤维和缠绕未添加MWNT 相变纤维的模型帽子的内部温度,前者从相同的初始温度17℃升温到达石蜡RT27 的相变温度(27℃)所用的时间比后者减少了25%。研究结果为制备具有良好导热性能、高强度和稳定、快速调温性能的相变纤维提供重要的实验参考和指导。

关键词: 微流体学, 相变, 焓, 纤维, 导热性能

CLC Number:

TQ342⁺.89

WEN Guoqing, XIE Rui, JU Xiaojie, WANG Wei, LIU Zhuang, CHU Liangyin. Preparation and properties of MWNT/polyvinyl butyral composite phase change fibers[J]. Chemical Industry and Engineering Progree, 2015, 34(10): 3688-3692,3718.

温国清, 谢锐, 巨晓洁, 汪伟, 刘壮, 褚良银. 多壁碳纳米管/聚乙烯醇缩丁醛复合相变纤维的制备与性能[J]. 化工进展, 2015, 34(10): 3688-3692,3718.

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