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Materials 2013, 6(9), 4122-4138;

High Density Polyethylene Composites Reinforced with Hybrid Inorganic Fillers: Morphology, Mechanical and Thermal Expansion Performance

College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
Korea Forest Research Institute, Seoul 130-712, Korea
Department of Forest Products and Biotechnology, Kookmin University, Seoul 136-702, Korea
School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
Author to whom correspondence should be addressed.
Received: 26 May 2013 / Revised: 5 September 2013 / Accepted: 9 September 2013 / Published: 17 September 2013
(This article belongs to the Special Issue Constitutive Behavior of Composite Materials)
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The effect of individual and combined talc and glass fibers (GFs) on mechanical and thermal expansion performance of the filled high density polyethylene (HDPE) composites was studied. Several published models were adapted to fit the measured tensile modulus and strength of various composite systems. It was shown that the use of silane-modified GFs had a much larger effect in improving mechanical properties and in reducing linear coefficient of thermal expansion (LCTE) values of filled composites, compared with the use of un-modified talc particles due to enhanced bonding to the matrix, larger aspect ratio, and fiber alignment for GFs. Mechanical properties and LCTE values of composites with combined talc and GF fillers varied with talc and GF ratio at a given total filler loading level. The use of a larger portion of GFs in the mix can lead to better composite performance, while the use of talc can help lower the composite costs and increase its recyclability. The use of 30 wt % combined filler seems necessary to control LCTE values of filled HDPE in the data value range generally reported for commercial wood plastic composites. Tensile modulus for talc-filled composite can be predicted with rule of mixture, while a PPA-based model can be used to predict the modulus and strength of GF-filled composites. View Full-Text
Keywords: glass fiber; talc; HDPE; composites; mechanical; thermal expansion glass fiber; talc; HDPE; composites; mechanical; thermal expansion

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Huang, R.; Xu, X.; Lee, S.; Zhang, Y.; Kim, B.-J.; Wu, Q. High Density Polyethylene Composites Reinforced with Hybrid Inorganic Fillers: Morphology, Mechanical and Thermal Expansion Performance. Materials 2013, 6, 4122-4138.

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