Preparation and performance of liquid paraffin/polysulfone resin/nano⁃SiO2 composite phase change materials

doi:10.19491/j.issn.1001-9278.2022.06.006

Abstract

Abstract:

A novel type of microencapsulated phase change material （PCM） with a liquid paraffin wax core， a polysulfone shell， and a nano?SiO₂ inlay was synthesized through a solvent evaporation method， and its structure and properties were characterized using SEM， FTIR， DSC， and TGA. The results indicated that the resultant microcapsules obtained the smallest particle size of 164.8 μm at a nano?SiO₂ addition amount of 5 wt %. There is an optimal enthalpy and encapsulation efficiency for the microcapsules， resulting in a melting enthalpy of 88.03 J/g， a crystallization enthalpy of 86.48 J/g， and a packaging efficiency of 57.37 %. The FTIR analysis indicated that the chemical structure of the phase?change microcapsules was not affected by the addition of nano?SiO₂. The particle size of the microcapsules increased by the modification of nano?SiO₂， and their surface structure showed small voids. Meanwhile， their phase?change performance and thermal stability were improved.

Key words: microencapsulation, phase change material, solvent evaporation method, thermal property

CLC Number:

TQ322

ZHANG Yunfeng, ZHONG Wei, ZHANG Lu, LAN Zhixing, DONG Zhibo. Preparation and performance of liquid paraffin/polysulfone resin/nano⁃SiO₂composite phase change materials[J]. China Plastics, 2022, 36(6): 32-38.

Figures/Tables 7

References 30

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组分	第一组	第二组	第三组	第四组	第五组
聚砜树脂/g	2	2	2	2	2
纳米SiO₂/ %	0	1	3	5	7
液体石蜡/g	4	4	4	4	4
聚乙烯醇/g	5	5	5	5	5
二氯甲烷/mL	50	50	50	50	50
去离子水/mL	500	500	500	500	500

组分	第一组	第二组	第三组	第四组	第五组
聚砜树脂/g	2	2	2	2	2
纳米SiO₂/ %	0	1	3	5	7
液体石蜡/g	4	4	4	4	4
聚乙烯醇/g	5	5	5	5	5
二氯甲烷/mL	50	50	50	50	50
去离子水/mL	500	500	500	500	500

样品	熔化		结晶		E_r/ %
样品	T_m/℃	∆H_m/J•g^-1	T_c/℃	∆H_c/J•g^-1	E_r/ %
石蜡	28.64	151.1	22.92	153.1	—
0 %	30.07	88.00	21.91	86.87	57.49
1 %	30.10	63.67	21.70	61.91	41.28
3 %	30.11	74.06	22.12	73.82	48.61
5 %	30.11	88.03	22.77	86.48	57.37
7 %	29.77	76.82	21.82	74.33	49.69

样品	熔化		结晶		E_r/ %
样品	T_m/℃	∆H_m/J•g^-1	T_c/℃	∆H_c/J•g^-1	E_r/ %
石蜡	28.64	151.1	22.92	153.1	—
0 %	30.07	88.00	21.91	86.87	57.49
1 %	30.10	63.67	21.70	61.91	41.28
3 %	30.11	74.06	22.12	73.82	48.61
5 %	30.11	88.03	22.77	86.48	57.37
7 %	29.77	76.82	21.82	74.33	49.69

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Preparation and performance of liquid paraffin/polysulfone resin/nano⁃SiO₂composite phase change materials

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