Microencapsulation of stearic acid with polymethylmethacrylate using iron (III) chloride as photo-initiator for thermal energy storage

doi:10.1016/j.cjche.2017.04.013

›› 2017, Vol. 25 ›› Issue (10): 1524-1532.DOI: 10.1016/j.cjche.2017.04.013

• Energy, Resources and Environmental Technology • 上一篇下一篇

Microencapsulation of stearic acid with polymethylmethacrylate using iron (III) chloride as photo-initiator for thermal energy storage

Ting Zhang¹, Minmin Chen¹, Yu Zhang¹, Yi Wang^1,2

1 College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;
2 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

收稿日期:2016-11-22 修回日期:2017-04-21 出版日期:2017-10-28 发布日期:2017-05-01
通讯作者: Yi Wang,E-mail addresses:wangyi@lut.cn,haoyunwangyi1977@163.com
基金资助:
Supported by the National Natural Science Foundation of China (51562023), the Natural Science Foundation of Gansu Provence (145RJZA185) and the National science and technology support project (2014BAA01B01).

Microencapsulation of stearic acid with polymethylmethacrylate using iron (III) chloride as photo-initiator for thermal energy storage

Ting Zhang¹, Minmin Chen¹, Yu Zhang¹, Yi Wang^1,2

1 College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;
2 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

Received:2016-11-22 Revised:2017-04-21 Online:2017-10-28 Published:2017-05-01
Supported by:
Supported by the National Natural Science Foundation of China (51562023), the Natural Science Foundation of Gansu Provence (145RJZA185) and the National science and technology support project (2014BAA01B01).

摘要/Abstract

摘要： Aiming to identify the validity of fabricating microencapsulated phase change material (PCM) with polymethylmethacrylate (PMMA) by ultraviolet curing emulsion polymerization method using iron (Ⅲ) chloride as photoinitiator, SA/PMMA microcapsules were prepared and various techniques were employed to determine the ignition mechanism, structural characteristics and thermal properties of the composite. The results shown that the microcapsules containing SA with maximum percentage of 52.20 wt% formed by radical mechanism and only physical interactions existed in the components both in the prepared process and subsequent use. The phase change temperatures and latent heats of the microencapsulated SA were measured as 55.3℃ and 102.1 J·g^-1 for melting, and 48.8℃ and 102.8 J·g^-1 for freezing, respectively. Thermal gravimetric analysis revealed that SA/PMMA has good thermal durability in working temperature range. The results of accelerated thermal cycling test are all shown that the SA/PMMA have excellent thermal reliability and chemical stability although they were subjected 1000 melting/freezing cycles. In summary, the comparable thermal storage ability and good thermal reliability facilitated SA/PMMA to be considered as a viable candidate for thermal energy storage. The successful fabrication of SA/PMMA capsules indicates that ferric chloride is a prominent candidate for synthesizing PMMA containing PCM composite.

关键词: Thermal energy storage, Phase change material, Microencapsulation, Thermodynamic properties, Synthesis, Photochemistry

Abstract: Aiming to identify the validity of fabricating microencapsulated phase change material (PCM) with polymethylmethacrylate (PMMA) by ultraviolet curing emulsion polymerization method using iron (Ⅲ) chloride as photoinitiator, SA/PMMA microcapsules were prepared and various techniques were employed to determine the ignition mechanism, structural characteristics and thermal properties of the composite. The results shown that the microcapsules containing SA with maximum percentage of 52.20 wt% formed by radical mechanism and only physical interactions existed in the components both in the prepared process and subsequent use. The phase change temperatures and latent heats of the microencapsulated SA were measured as 55.3℃ and 102.1 J·g^-1 for melting, and 48.8℃ and 102.8 J·g^-1 for freezing, respectively. Thermal gravimetric analysis revealed that SA/PMMA has good thermal durability in working temperature range. The results of accelerated thermal cycling test are all shown that the SA/PMMA have excellent thermal reliability and chemical stability although they were subjected 1000 melting/freezing cycles. In summary, the comparable thermal storage ability and good thermal reliability facilitated SA/PMMA to be considered as a viable candidate for thermal energy storage. The successful fabrication of SA/PMMA capsules indicates that ferric chloride is a prominent candidate for synthesizing PMMA containing PCM composite.

Key words: Thermal energy storage, Phase change material, Microencapsulation, Thermodynamic properties, Synthesis, Photochemistry

Ting Zhang, Minmin Chen, Yu Zhang, Yi Wang. Microencapsulation of stearic acid with polymethylmethacrylate using iron (III) chloride as photo-initiator for thermal energy storage[J]. , 2017, 25(10): 1524-1532.

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Microencapsulation of stearic acid with polymethylmethacrylate using iron (III) chloride as photo-initiator for thermal energy storage

Microencapsulation of stearic acid with polymethylmethacrylate using iron (III) chloride as photo-initiator for thermal energy storage

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