Effect of polytetrafluoroethylene fibrillation on the foaming behavior of TPEE/PTFE composites

doi:10.19491/j.issn.1001-9278.2022.12.006

Abstract

Abstract:

The TPEE/PTFE nanofiber composites were prepared by means of a melt blending method， and the effect of different processing technologies on PTFE fibrosis was investigated. Furthermore， the effect of PTFE content on the crystallization behavior， rheological behavior and foaming behavior of TPEE were studied. The results indicated that PTFE fiber promoted the crystallization of TPEE and improved the rheological properties of TPEE. The high specific surface area of nanofibers can provide a large number of nucleation sites for cell nucleation， effectively improving the cell density and reducing the cell size. The TPEE/PTFE composite foam obtained an average cell size of 3.2 μm and a cell density of 3.11×10¹⁰ cells/cm³ at a PTFE content of 2 phr.

Key words: thermoplastic elastomer, polytetrafluoroethylene, nanofiber, foam

CLC Number:

TQ 325.4

LI Juan, WANG Yaqiao. Effect of polytetrafluoroethylene fibrillation on the foaming behavior of TPEE/PTFE composites[J]. China Plastics, 2022, 36(12): 38-43.

Figures/Tables 9

样品编号	TPEE/份	CE/份	PTFE/份
1^′	100	0.3	0
2^#	100	0.3	0.5
3^′	100	0.3	1.0
4^′	100	0.3	1.5
5^#	100	0.3	2.0

Tab.1. Different ratio of the blends of TPEE/CE/PTFE

Fig.1. Morphology of PTFE in TPEE/PTFE at different rotating speeds of torque rheometer

Fig.2. Morphology of PTFE in TPEE/PTFE for different processing time at rotating speeds of 100 r/min

Fig.3. Morphology of PTFE in TPEE/PTFE at rotating speeds of 100 r/min for 10 mins

Fig.4. DSC curves of different TPEE samples

样品编号	T_c/℃	T_m/℃	ΔH_m/J·g^-1
1^#	168.6	194.4	26.9
2^#	169.4	194.7	24.7
3^#	169.9	194.8	24.6
4^#	170.6	194.7	24.6
5^#	170.7	194.8	24.9

Tab.2. Crystallization properties of TPEE/CE/PTFE composites

Fig.5. Rheological property of TPEE/CE/PTFE composites

Fig.6. SEM of TPEE/PTFE composite foams（×400）

样品编号	泡沫密度/ g·cm^-3	泡孔平均直径/ µm	泡孔密度/ ×10¹⁰个·cm⁃³
1^#	0.22±0.02	6.6±0.3	2.06±0.13
2^#	0.18±0.03	5.5±0.4	2.30±0.19
3^#	0.24±0.03	4.5±0.2	2.35±0.21
4^#	0.24±0.02	4.9±0.3	2.51±0.26
5^#	0.26±0.02	3.2±0.2	3.11±0.20

Tab.3. Properties of TPEE/CE/PTFE foams

References 14

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