Preparation and Properties of Paraffin Microencapsulated Phase-change Materials with Fine Particle Size†

doi:10.7503/cjcu20140406

Abstract

Abstract:

Microcapsules of phase change materials(MicorPCMs) with paraffin core and acrylic ester shell were synthesized by cationic-nonionic composite emulsifiers via in-situ polymerization. The chemical structure, surface morphology and thermal properties of the MicroPCMs were characterized by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), differential scanning calorimetry(DSC), thermogravimetry(TG) and laser particle analyzer. The results show that the composition of emulsifier and the formulation of the monomer in shell have great effects on the properties of the MicroPCMs. When the cationic-nonionic composite emulsifiers are empolyed and the mass ratio between methyl methacrylate(MMA) and acrylic(AA) is 9∶1, the MicroPCMs present smooth, spherical morphology and fine size of 0.2—0.35 μm, providing a high latent heat of phase change of 169 J/g and a good energy storage capacity. The decomposition temperature of the MicorPCMs increase 150 ℃ in comparison with pure paraffin, which is attributed to the thermal retardation of the acrylic ester shell.

Key words: Composite emulsifier, Acrylic ester, Paraffin, Microcapsule phase-change material, Latent heat of phase change

CLC Number:

O632

TrendMD:

ZHANG Qiuxiang, CHEN Jianhua, LU Hongbin, TANG Wei, LU Yu, GAO Yangzhi. Preparation and Properties of Paraffin Microencapsulated Phase-change Materials with Fine Particle Size^†[J]. Chem. J. Chinese Universities, 2014, 35(10): 2258.

Figures/Tables 12

References 27

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Sample	m(Paraffin)/g	m(Tween-80)/g	m(Span-80)/g	m(SDS)/g	m(CTAB)/g	m(MMA)/g	m(AA)/g
1	10	1.2	0.8			8	2
2	10	1	0.5	0.2		8	2
3	10	1	0.5		0.03	8	2
4		1	0.5		0.03	8	2
5	10	1	0.5		0.03	10
6	10	1	0.5		0.03	9	1
7	10	1	0.5		0.03	7	3
8	10	1	0.5		0.03	6	4
9	10	1	0.5		0.03	5	5

Sample	m(Paraffin)/g	m(Tween-80)/g	m(Span-80)/g	m(SDS)/g	m(CTAB)/g	m(MMA)/g	m(AA)/g
1	10	1.2	0.8			8	2
2	10	1	0.5	0.2		8	2
3	10	1	0.5		0.03	8	2
4		1	0.5		0.03	8	2
5	10	1	0.5		0.03	10
6	10	1	0.5		0.03	9	1
7	10	1	0.5		0.03	7	3
8	10	1	0.5		0.03	6	4
9	10	1	0.5		0.03	5	5

Emulsifier	T_om/℃	T_pm/℃	T_oc/℃	T_pc/℃	ΔH_m/(J·g^-1)	ΔH_c/(J·g^-1)	Paraffin content(%)
Pure paraffin	44.49	46.69	43.64	41.50	249.20	216.10	100
Cationic and non-ionic composite emulsifiers	41.20	45.74	43.10	41.26	127.96	126.23	54.63
Non-ionic emulsifier	41.84	44.98	42.17	39.51	94.42	76.75	36.79
Anionic and non-ionic composite emulsifiers	43.16	45.59	43.14	41.62	71.04	58.63	27.87

Emulsifier	T_om/℃	T_pm/℃	T_oc/℃	T_pc/℃	ΔH_m/(J·g^-1)	ΔH_c/(J·g^-1)	Paraffin content(%)
Pure paraffin	44.49	46.69	43.64	41.50	249.20	216.10	100
Cationic and non-ionic composite emulsifiers	41.20	45.74	43.10	41.26	127.96	126.23	54.63
Non-ionic emulsifier	41.84	44.98	42.17	39.51	94.42	76.75	36.79
Anionic and non-ionic composite emulsifiers	43.16	45.59	43.14	41.62	71.04	58.63	27.87

m(MMA)∶m(AA)	T_om/℃	T_pm/℃	T_oc/℃	T_pc/℃	ΔH_m/(J·g^-1)	ΔH_c/(J·g^-1)	Paraffin content(%)
Pure MMA	41.22	43.73	41.65	39.53	16.53	12.67	6.28
9∶1	42.05	46.53	43.12	41.09	168.57	164.76	71.64
8∶2	41.20	45.74	43.10	41.26	127.96	126.23	54.63
7∶3	43.26	45.59	43.11	42.12	105.86	94.91	43.15
6∶4	41.75	45.86	43.30	42.05	125.79	121.03	53.05
5∶5	42.89	45.55	43.04	41.35	48.92	44.94	20.17