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Materials 2015, 8(1), 368-378;

Sorption Isotherm of Southern Yellow Pine—High Density Polyethylene Composites

Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China
School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
Author to whom correspondence should be addressed.
Academic Editor: Jérôme Chevalier
Received: 13 October 2014 / Revised: 13 November 2014 / Accepted: 9 January 2015 / Published: 20 January 2015
(This article belongs to the Section Biomaterials)
Full-Text   |   PDF [566 KB, uploaded 20 January 2015]   |  


Temperature and relative humidity (RH) are two major external factors, which affect equilibrium moisture content (EMC) of wood-plastic composites (WPCs). In this study, the effect of different durability treatments on sorption and desorption isotherms of southern yellow pine (SYP)-high density polyethylene (HDPE) composites was investigated. All samples were equilibriumed at 20 °C and various RHs including 16%, 33%, 45%, 66%, 75%, 85%, 93%, and100%. EMCs obtained from desorption and absorption for different WPC samples were compared with Nelson’s sorption isotherm model predictions using the same temperature and humidity conditions. The results indicated that the amount of moisture absorbed increased with the increases in RH at 20 °C. All samples showed sorption hysteresis at a fixed RH. Small difference between EMC data of WPC samples containing different amount of ultraviolet (UV) stabilizers were observed. Similar results were observed among the samples containing different amount of zinc borate (ZB). The experimental data of EMCs at various RHs fit to the Nelson’s sorption isotherm model well. The Nelson’s model can be used to predicate EMCs of WPCs under different RH environmental conditions. View Full-Text
Keywords: wood-plastic composites; sorption isotherm; durability treatments; nelson’s model wood-plastic composites; sorption isotherm; durability treatments; nelson’s model

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Liu, F.; Han, G.; Cheng, W.; Wu, Q. Sorption Isotherm of Southern Yellow Pine—High Density Polyethylene Composites. Materials 2015, 8, 368-378.

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