Study on preparation and properties of high strength PS/PPO open cell foams induced by stabilized island structure

doi:10.19491/j.issn.1001-9278.2024.03.009

Abstract

Abstract:

Polystyrene （PS）/polyphenyl ether （PPO） blends were prepared by melt blending method. By controlling the processing temperature， PPO exists in the blend in the form of rigid particles， forming a stable “island” structure. By using supercritical carbon dioxide as blowing agent， the PS open cell foam with high porosity was obtained. The effect of PPO contents on the rheological properties and thermodynamic behavior of PS， and the effect of stable “island” structure on the formation of PS/PPO foam were studied. The cell size， foaming rate， opening rate and foam compression properties of PS/PPO foam products were analyzed. The results showed that when the foaming temperature was 158 ℃， the pressure was 20 MPa and the PPO content was 10 %， the PS open⁃cell foam with foaming ratio of 37.5 times and opening ratio of 96.9 % could be prepared.

Key words: polystyrene, polyphenyl ether, supercritical carbon dioxide, foaming material, open cell foam

CLC Number:

TQ328.4

JIANG Shuaihua, LI Zhuolun, LU Haofan, SUN Yibo, WANG Xiangdong, CHEN Shihong, WU Lili. Study on preparation and properties of high strength PS/PPO open cell foams induced by stabilized island structure[J]. China Plastics, 2024, 38(3): 49-53.

Figures/Tables 10

样品编号	PS含量/份	PPO含量/份	168含量/份	1010含量/份
1^＃	100	0	0	0
2^＃	95	5	0.3	0.6
3^＃	90	10	0.3	0.6
4^＃	85	15	0.3	0.6
5^＃	80	20	0.3	0.6

Tab. 1. Different ratio of the PS/PPO blends and additives

Fig.1. Material form of PPO

Fig.2. SEM of pure PS and various PS/PPO blends plates

Fig.3. Melting curves for different samples

Fig.4. Rheological properties of pure PS and PS/PPO blends

Fig.5. SEM images of foam samples at different temperature

温度/℃	PPO含量/份	泡孔平均直径/μm	泡孔密度/×10⁷个∙cm^-3
150	0	7.43	31.50
	5	9.12	25.23
	10	9.56	25.43
	15	10.04	24.65
	20	10.56	24.54
154	0	8.91	25.90
	5	17.31	13.75
	10	21.25	12.25
	15	34.69	8.79
	20	36.13	8.28
158	0	10.54	24.50
	5	20.23	13.17
	10	21.44	12.73
	15	39.76	9.46
	20	41.87	8.52
162	0	12.89	23.86
	5	23.33	15.31
	10	26.72	14.82
	15	55.04	7.48
	20	57.28	7.62

Tab.2. Cell structure parameters of foam samples

Fig.6. Foaming ratio of PS/PPO foam samples when the temperature is 150~162 ℃ and the pressure is 20 MPa

Fig.7. Cell opening rate of the PS/PPO foam samples

Fig.8. Stress⁃strain curves of the compressive strength of foam samples

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