Effects of SiO2 Filler in the Shell and Wood Fiber in the Core on the Thermal Expansion of Core–Shell Wood/Polyethylene Composites

Key Laboratory for Bio-based Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou 510642, China

Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China

Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China

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Art and Design Institute, Yangzhou University, 88 Daxue South Road, Yangzhou 225009, China

Authors to whom correspondence should be addressed.

Polymers 2020, 12(11), 2570; https://doi.org/10.3390/polym12112570

Received: 8 October 2020 / Revised: 22 October 2020 / Accepted: 22 October 2020 / Published: 2 November 2020

(This article belongs to the Special Issue Recent Developments in Eco-Friendly Wood-Based Composites)

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Abstract

The influence of nano-silica (nSiO₂) and micro-silica (mSiO₂) in the shell and wood fiber filler in the core on the thermal expansion behavior of co-extruded wood/polyethylene composites (Co-WPCs) was investigated to optimize the thermal expansion resistance. The cut Co-WPCs samples showed anisotropic thermal expansion, and the thermal expansion strain and linear coefficient of thermal expansion (LCTE) decreased by filling the shell layer with rigid silica, especially nSiO₂. Finite element analysis indicated that the polymer-filled shell was mainly responsible for the thermal expansion. The entire Co-WPCs samples exhibited a lower thermal expansion strain than the cut Co-WPCs samples due to protection by the shell. Increasing the wood fiber content in the core significantly decreased the thermal expansion strain and LCTE of the Co-WPCs. The Co-WPCs whose core layer was filled with 70% wood fiber exhibited the greatest anisotropic thermal expansion. View Full-Text

Keywords: co-extrusion; wood plastic composites; thermal expansion; silica; core–shell structure

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MDPI and ACS Style

Sun, L.; Zhou, H.; Zong, G.; Ou, R.; Fan, Q.; Xu, J.; Hao, X.; Guo, Q. Effects of SiO₂ Filler in the Shell and Wood Fiber in the Core on the Thermal Expansion of Core–Shell Wood/Polyethylene Composites. Polymers 2020, 12, 2570. https://doi.org/10.3390/polym12112570

AMA Style

Sun L, Zhou H, Zong G, Ou R, Fan Q, Xu J, Hao X, Guo Q. Effects of SiO₂ Filler in the Shell and Wood Fiber in the Core on the Thermal Expansion of Core–Shell Wood/Polyethylene Composites. Polymers. 2020; 12(11):2570. https://doi.org/10.3390/polym12112570

Chicago/Turabian Style

Sun, Lichao, Haiyang Zhou, Guanggong Zong, Rongxian Ou, Qi Fan, Junjie Xu, Xiaolong Hao, and Qiong Guo. 2020. "Effects of SiO₂ Filler in the Shell and Wood Fiber in the Core on the Thermal Expansion of Core–Shell Wood/Polyethylene Composites" Polymers 12, no. 11: 2570. https://doi.org/10.3390/polym12112570

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Effects of SiO₂ Filler in the Shell and Wood Fiber in the Core on the Thermal Expansion of Core–Shell Wood/Polyethylene Composites

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