Preparation and properties of microporous breathable films with high thermal conductivity

doi:10.19491/j.issn.1001-9278.2022.07.003

Abstract

Abstract:

A thermally conductive Al₂O₃ filler with a spherical shape was incorporated into the conventional formula of specialized materials for breathable films to improve their thermal conductance. After melt mixing with a two rotor continuous mixer， the composites were used to prepare breathable films using casting equipment equipped with stretching units. The effects of Al₂O₃ content and stretch ratio on the performance of breathable films were investigated. The results indicated that compared to the original formula， the breathable films achieved an increase in thermal conductivity by over 60 % at a mass ratio of linear low?density polyethylene/CaCO₃/Al₂O₃ of 50/35/15 and a stretch ratio between 200 % and 300 %. However， there was no influence on their mechanical properties and breathability.

Key words: linear low?density polyethylene, nano?alumina, thermally conductive breathable film, stretch ratio

CLC Number:

TQ320.72⁺1

LI Guo, ZHU Huihao, MA Yulu, WANG Yu, JI Huajian, XIE Linsheng. Preparation and properties of microporous breathable films with high thermal conductivity[J]. China Plastics, 2022, 36(7): 14-20.

Figures/Tables 9

样品编号	PE⁃LLD含量/%	CaCO₃含量/%	Al₂O₃含量/%
1^#	50	50	0
2^#	50	45	5
3^#	50	40	10
4^#	50	35	15
5^#	50	30	20

Tab.1. Formulation of PE?LLD/ CaCO3/Al2O3 composites

Fig.1. Platform of precision vertical longitudinal tensile test

Fig.2. SEM micrographs of fracture surfaces of the composites with different ratios of Al2O3 to CaCO3

Fig.3. Shear viscosity of PE?LLD/CaCO3/Al2O3 composites with different Al2O3 content

Fig.4. Mechanical properties along MD of the composites films with different Al2O3 content

Fig.5. Mechanical properties along CD of the composites films with different Al2O3 content

Fig.6. Breathable properties of the composites films with different Al2O3 content

Fig.7. SEM images of surfaces of the composites film with different Al2O3 content and various stretching ratios

Fig.8. Thermal conductivity of the composites films with different Al2O3 content

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