Establishment and Application of Thermally Conductive Prediction Model for High‑Filled Modified Composites

doi:10.19491/j.issn.1001-9278.2020.07.008

Abstract

Abstract:

On the basis of the research of the thermal conduction process of high?filled modified composites, the thermally conductive prediction model for high?filled modified composites which considering the effect of the interfacial thermal resistance at the same time was established based on the series?parallel/parallel?series model. Polypropylene/alumina （PP/Al₂O₃） composites with two types of alumina particle sizes under different loadings were prepared by a two?rotor continuous mixer. The thermal conductivity of the composites was characterized by a laser thermal conductivity instrument and then was compared with the model prediction results. The results show that: The established model has higher accuracy in predicting the thermal conductivity of the highly filled composites. The interfacial thermal resistance factor in the model is highest when the alumina loading is low; the factor significantly reduce as the alumina loading reaches to a certain level; finally, the factor remains stable when the alumina loading continues to increase. The interfacial thermal resistance of the same filled and modified composite prepared by the same preparation process under high filling capacity is approximately the same.

Key words: thermally conductive prediction model, thermally conductive composite, alumina, interfacial thermal resistance

CLC Number:

TQ327.8

Yanghui WANG, Yulu MA, Linsheng XIE, Guo SONG, Huihao ZHU. Establishment and Application of Thermally Conductive Prediction Model for High‑Filled Modified Composites[J]. China Plastics, 2020, 34(7): 49-55.

Figures/Tables 6

Fig. 1. The diagrams of the overall distribution of the filler and the thermal conduction of the unit

Fig.2. Schematic diagram of heat flow transfer in the series?parallel thermally conductive prediction model for high?filled modified composites

Fig. 3. Schematic diagram of heat flow transfer in the parallel?series thermally conductive prediction model for high?filled modified composites

Fig.4. Thermal conductivity of PP/Al2O3 composites with two types of alumina particle sizes under different alumina loadings

Fig. 5. Interfacial thermal resistance factor C of PP/Al2O3 composites with two types of alumina particle sizes under different alumina loadings

Fig.6. Comparison of experimental values and model prediction ones of thermal conductivity of PP/Al2O3 composites with two types of alumina particle sizes under different loadings

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