Fabrication of foamy phase change materials with enhanced thermal performance by emulsion⁃templating method

doi:10.19491/j.issn.1001-9278.2025.03.004

Abstract

Abstract:

Polystyrene/paraffin phase⁃change composite foam （EPSPW） was prepared through encapsulating paraffin into the pores of the foam using an emulsion⁃templating method. SEM observation indicated that the porosity of EPSPW ranged from 85 to 92 vol% and the pore size ranged from 3.5 to 10 μm with a narrow distribution. When the paraffin content was 30 wt%， EPSPW exhibited excellent shape stability without any leakage of paraffin， and its loading of paraffin was 33 times as great as its own mass. The leaching test results indicated that the mass loss rate of the sample was only 3 wt% at temperatures above the melting point of paraffin. EPSPW presented a melting enthalpy of 32 J/g， which was much higher than that of directly foamed phase⁃change foam materials （mostly around 15~20 J/g）. In addition， EPSPW exhibited good cycle stability over 50 heating/cooling cycles.

Key words: foamy phase change material, emulsion template, paraffin wax, thermal performance

CLC Number:

TQ325.2

DENG Jingqian, KONG Peng, HOU Dandan. Fabrication of foamy phase change materials with enhanced thermal performance by emulsion⁃templating method[J]. China Plastics, 2025, 39(3): 19-24.

Figures/Tables 13

References 37

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样品	质量比					石蜡质量分数/%
样品	St	DVB	Span80	石蜡	石蜡乳化剂	石蜡质量分数/%
EPS	4	4	2	0	0	0
EPSPW1	6	6	3	4.00	1	20.0
EPSPW2	4	4	2	4.00	1	26.7
EPSPW3	10	10	5	12.00	3	30.0
PW	0	0	0	10.00	0	100.0
PS/20wt%PW	6	6	3	3.75	0	20.0

样品	质量比					石蜡质量分数/%
样品	St	DVB	Span80	石蜡	石蜡乳化剂	石蜡质量分数/%
EPS	4	4	2	0	0	0
EPSPW1	6	6	3	4.00	1	20.0
EPSPW2	4	4	2	4.00	1	26.7
EPSPW3	10	10	5	12.00	3	30.0
PW	0	0	0	10.00	0	100.0
PS/20wt%PW	6	6	3	3.75	0	20.0

样品	密度/g·cm^-3	孔隙率/%
EPS	0.055	93.9
EPSPW1	0.090	91.2
EPSPW2	0.130	87.1
EPSPW3	0.150	85.1

样品	密度/g·cm^-3	孔隙率/%
EPS	0.055	93.9
EPSPW1	0.090	91.2
EPSPW2	0.130	87.1
EPSPW3	0.150	85.1

样品	T_cpeak/ ℃	ΔH_c/ J·g^-1	T_mpeak/ ℃	ΔH_m/ J·g^-1	X_relative/ %
PW	45.2	138.5	55.9	134.1	100.0
PS/20wt%PW	45.2	27.7	55.9	26.8	100.0
EPSPW1	46.1	18.2	53.4	17.6	65.6
EPSPW2	45.3	28.5	54.0	27.9	78.5
EPSPW3	45.7	33.0	53.4	32.0	79.5
EPSPW3⁃经过50个循环	45.7	32.8	53.4	31.9	-