乳化工艺对微胶囊型硬脂酸相变材料热性质的影响

doi:10.7503/cjcu20190253

摘要/Abstract

摘要：

以硬脂酸为芯材, 碳酸钙为壁材, 采用原位聚合法制备了微胶囊型相变材料; 通过扫描电子显微镜、红外光谱及差热-热重分析对其表面形貌和热性质进行了表征; 通过改变乳化剂的种类及用量, 研究了乳化工艺对微胶囊型相变材料表面形貌、相变温度和包覆率的影响. 实验结果表明, 在选用的3种乳化剂十二烷基苯磺酸钠、十六烷基三甲基溴化铵和曲拉通X-100中, 十二烷基苯磺酸钠相对效果最好, 乳化剂与芯材最佳质量比为0.5%, 相变温度为112.24 ℃时, 封装率达到92.1%.

关键词: 乳化工艺, 硬脂酸, 微胶囊, 相变材料

Abstract:

Microcapsules were prepared by in situ polymerization using calcium carbonate as wall material and stearic acid as core material. And its surface morphology and thermal properties are characterized by scanning electron microscopy, Fourier transfer-infrared spectrometry, differential thermal analysis and thermogravimetry. The effect of emulsifying process on the surface morphology, transformation temperature and encapsulation rate were studied by changing the kinds and dosage of emulsifiers. The results showed that sodium dodecyl benzene sulfonate is the most suitable emulsifier compared with cetyltrimethylammonium bromide and TX-100, and the adequate mass proportion of the emulsifier vs. core material is 0.5%. The transformation temperature is 112.24 ℃, and the clad ratio is 92.1%.

Key words: Emulsification technology, Stearic acid, Microcapsule, Phase change material

中图分类号:

TrendMD:

陈缘,赵雪静,梁宏伟,吴秀文,张金林. 乳化工艺对微胶囊型硬脂酸相变材料热性质的影响. 高等学校化学学报, 2019, 40(10): 2149.

CHEN Yuan,ZHAO Xuejing,LIANG Hongwei,WU Xiuwen,ZHANG Jinlin. Effect of Emulsification Process on the Thermal Properties of Stearic Acid Phase Change Microcapsules ^†. Chem. J. Chinese Universities, 2019, 40(10): 2149.

图/表 6

Table 1 Thermal properties of raw materials and samples*

Sample No.	Emulsifier	w_E(%)	T_m/℃	ΔH_m/(J·g^-1)	ΔH_SA/(J·g^-1)	R(%)
1	CTAB	0.5	119.13	186.8	206.8	90.3
2	CTAB	0.7	122.24	23.95	206.8	11.6
3	CTAB	1	114.71	136.3	206.8	65.9
4	CTAB	2	109.27	170.2	206.8	82.3
5	TX-100	0.5	112.36	73.65	206.8	36.1
6	TX-100	0.7	61.64	33.08	206.8	17.0
7	TX-100	1	67.71	72.38	206.8	35.0
8	TX-100	2	61.25	139.9	206.8	67.6
9	SDBS	0.5	112.24	190.5	206.8	92.1
10	SDBS	0.7	113.36	144.4	206.8	69.8
11	SDBS	1	112.17	145.0	206.8	70.1
12	SDBS	2	115.43	169.2	206.8	81.8

Fig.1 SEM images of microcapsules(sample 1)

Fig.2 FTIR spectra of SA-CaCO3(A) and stearic acid(B)

Fig.3 TGA curves of samples with different types of emulsifiers Curves a—c are corresponding to the samples 1, 5 and 9 in Table 1, respectively.

Fig.4 DSC curves of samples with different percentages of CTAB(A), TX-100(B) and SDBS(C) emulsifiers Mass fraction of emulsifier(%): a. 0.5; b. 0.7; c. 1; d. 2.

Fig.5 Photos of SA and samples 2 and 3 after one thermal cycle

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