Preparation and PTC Properties of HIPS/HDPE/CB Composites†

doi:10.7503/cjcu20170751

Abstract

Abstract:

Polymer-based positive temperature coefficient(PTC) composites were prepared by melting blending with high impact polystyrene(HIPS) and high density polyethylene(HDPE) as matrix, carbon black(CB) as conductive filler. The selective distribution of CB in two-phase matrix composite was characterized by scanning electron microscopy(SEM). The PTC performance of composite with different contents of CB was studied by thermistor resistivity-temperature(RT) curve tester. The results show that after adding HDPE in HIPS/CB system, the percolation threshold of HIPS/CB/HDPE composites decreases, the PTC intensity increases and the capability of voltage-withstanding also is improved.

Key words: Composite, High impact polystyrene, High density polyethylene, Positive temperature coefficient property, Polystyrene, Carbon black

CLC Number:

O631

TrendMD:

QIN Yanli, XU Haiping, QIU Houtian, ZHAI Yue, DAI Xiujuan, YANG Dandan, WANG Jingrong. Preparation and PTC Properties of HIPS/HDPE/CB Composites^†[J]. Chem. J. Chinese Universities, 2018, 39(6): 1305.

Figures/Tables 5

Fig.1 PTC property of HIPS/CB composites with different contents of CB at room temperature(A), with different temperature(B) and dependence of PTC intensity on content of CB(C)(B) a. 95.0%HIPS/5.0%CB; b. 94.0%HIPS/6.0%CB; c. 93.0%HIPS/7.0%CB; d. 92.0%HIPS/8.0%CB; e. 91.0%HIPS/9.0%CB.

Fig.2 PTC property of HIPS/HDPE/CB composites with 8.0% CB at different ratios of HIPS and HDPE(A) Dependence of resistivity on temperature; (B) dependence of PTC intensity on volume concentration of HIPS.

Fig.3 Morphologies of fractured surfaces of HIPS/HDPE/CB composites(A) 62.0%HDPE/30.0%HIPS/8.0%CB; (B) 32.0%HDPE/60.0%HIPS/8.0%CB.

Fig.4 Percolation threshold curves of composites

Table 1 PTC property and voltage-withstanding of composites

Sample	Room-temperature resistivity, ρ₀/(Ω·cm)	Volume fraction of CB(%)	PTC intensity	Capability of voltage- withstanding/V
Single matrix	20.8	7.0	2.5	250
	17.6	8.0	3.0	200
	13.2	9.0	1.5	180
Double matrices	20.8	3.0	5.5	400
	17.6	4.0	6.0	350
	13.2	5.0	6.0	300

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