Preparation of high⁃strength flame⁃retardant poly（phenylene ether） composite foams using supercritical carbon dioxide

doi:10.19491/j.issn.1001-9278.2024.11.004

Abstract

Abstract:

In this study， a type of high⁃strength and high⁃flame retardant polyphenylene ether （PPO） composite foams was prepared by using syndiotactic polystyrene （sPS） instead of high⁃impact polystyrene （HIPS）， styrene⁃ethylene/butadiene⁃styrene block copolymers （SEBS）， and halogen⁃free flame retardants through supercritical carbon dioxide foaming. The effect of sPS on the mechanical properties， foaming behavior， compressive strength， and flame⁃retardant performance of the composite foams were investigated. The results indicated that the introduction of sPS improved the rigidity and melt viscoelasticity of the composites significantly. The foamability of the composites was enhanced with an increase in the melt viscoelasticity. When 23 wt% sPS was added， the foaming rate of the composites increased from 5.9 to 36 times. The introduction of composite halogen⁃free flame retardants improved the flame⁃retardant performance of composite foams significantly. The PPO/HIPS/sPS composite foam with a density of 0.14 g/cm³ reached a flame⁃retardant grade of the UL94 V⁃0 rating and exhibited a limiting oxygen index of 27.4 vol%. At a density of 0.29 g/cm³， the PPO/HIPS/sPS composite foam containing 23 wt% of sPS presented an increase in the compressive strength from 1.9 MPa to 6.4 MPa.

Key words: poly（phenylene ether）, foam material, flame retardant, mechanical property

CLC Number:

TQ326.53

LYU Zhengyang, QIU Jian, XING Haiping, JIANG Zhiwei, LIU Jie, TANG Tao, LI Sanxi. Preparation of high⁃strength flame⁃retardant poly（phenylene ether） composite foams using supercritical carbon dioxide[J]. China Plastics, 2024, 38(11): 21-26.

Figures/Tables 10

References 19

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样品	发泡温度/℃	泡孔直径/μm	泡孔密度/个·cm^-3
PPO⁃10sPS	150	89	5.4×10⁹
	160	65	4.4×10⁹
	170	55	2.9×10⁹
PPO⁃15sPS	150	65	1.0×10¹⁰
	160	58	9.7×10⁹
	170	51	5.5×10⁹
PPO⁃23sPS	150	60	1.1×10¹⁰
	160	55	4.2×10⁹
	170	37	3.4×10⁹

样品	发泡温度/℃	泡孔直径/μm	泡孔密度/个·cm^-3
PPO⁃10sPS	150	89	5.4×10⁹
	160	65	4.4×10⁹
	170	55	2.9×10⁹
PPO⁃15sPS	150	65	1.0×10¹⁰
	160	58	9.7×10⁹
	170	51	5.5×10⁹
PPO⁃23sPS	150	60	1.1×10¹⁰
	160	55	4.2×10⁹
	170	37	3.4×10⁹

样品	密度/g·cm^-3	LOI/%	厚度/mm	t₁/s	t₂/s	是否滴落	等级
PPO⁃0sPS	0.29	29.7	3	7	—	是	V⁃2
PPO⁃0sPS	0.29	29.7	5	3	4	否	V⁃0
PPO⁃5sPS	0.29	29.4	3	5	—	是	V⁃2
PPO⁃5sPS	0.29	29.4	5	4	3	否	V⁃0
PPO⁃10sPS	0.14	27.5	5	7	—	是	V⁃2
PPO⁃10sPS	0.14	27.5	7	5	3	否	V⁃0
PPO⁃15sPS	0.14	27.4	5	5	—	是	V⁃2
	0.14	27.4	7	4	5	否	V⁃0
	0.10	26.8	3	2	—	是	V⁃2
			5	7	—	是	V⁃2
			8	10	—	是	V⁃2
PPO⁃23sPS	0.20	28.4	5	7	—	是	V⁃2
	0.20	28.4	8	6	4	否	V⁃0
	0.14	27.3	8	7	—	是	V⁃2
	0.10	26.5	8	8	—	是	V⁃2

样品	密度/g·cm^-3	LOI/%	厚度/mm	t₁/s	t₂/s	是否滴落	等级
PPO⁃0sPS	0.29	29.7	3	7	—	是	V⁃2
PPO⁃0sPS	0.29	29.7	5	3	4	否	V⁃0
PPO⁃5sPS	0.29	29.4	3	5	—	是	V⁃2
PPO⁃5sPS	0.29	29.4	5	4	3	否	V⁃0
PPO⁃10sPS	0.14	27.5	5	7	—	是	V⁃2
PPO⁃10sPS	0.14	27.5	7	5	3	否	V⁃0
PPO⁃15sPS	0.14	27.4	5	5	—	是	V⁃2
	0.14	27.4	7	4	5	否	V⁃0
	0.10	26.8	3	2	—	是	V⁃2
			5	7	—	是	V⁃2
			8	10	—	是	V⁃2
PPO⁃23sPS	0.20	28.4	5	7	—	是	V⁃2
	0.20	28.4	8	6	4	否	V⁃0
	0.14	27.3	8	7	—	是	V⁃2
	0.10	26.5	8	8	—	是	V⁃2

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