Sorption Isotherm of Southern Yellow Pine—High Density Polyethylene Composites
Abstract
:1. Introduction
2. Experimental
2.1. Raw Materials and Preparation
2.2. Blend Design and Sample Fabrication
Material type | UV stabilizer (wt%) | ZB (wt%) | Wood flour (wt%) | HDPE (wt%) | Other processing aids (wt%) | ||
---|---|---|---|---|---|---|---|
Tin783 | Chi944 | Tin326 | |||||
1 | – | – | – | – | 55 | 31 | 14 |
2 | 1 | – | – | – | 55 | 30 | 14 |
3 | 2 | – | – | – | 55 | 29 | 14 |
4 | – | 1 | – | – | 55 | 30 | 14 |
5 | – | 2 | – | – | 55 | 29 | 14 |
6 | – | – | 1 | – | 55 | 30 | 14 |
7 | – | – | 2 | – | 55 | 29 | 14 |
8 | 1 | – | – | 1 | 55 | 29 | 14 |
9 | 2 | – | – | 2 | 55 | 27 | 14 |
10 | – | 1 | – | 1 | 55 | 29 | 14 |
11 | – | 2 | – | 2 | 55 | 27 | 14 |
12 | – | – | 1 | 1 | 55 | 29 | 14 |
13 | – | – | 2 | 2 | 55 | 27 | 14 |
14 | – | – | 1 | 55 | 30 | 14 | |
15 | – | – | 2 | 55 | 29 | 14 |
2.3. EMC Measurements
2.4. Nelson’s Model
3. Results and Discussion
3.1. Sorption Isotherm of WPCs
3.2. Effects of Durability Treatment on the EMC of WPCs
3.3. Nelson’s Model Fit to Measured EMC
Material | Absorption | Desorption | Hysteresis ratio (Ads./Des.) | ||
---|---|---|---|---|---|
A (cal/g) | Mv (%) | A (cal/g) | Mv (%) | ||
WPC | 3.37 | 16.70 | 4.60 | 16.81 | 0.978 |
MDF a | 4.68 | 19.13 | 4.94 | 24.94 | 0.767 |
Aspen a OSB a | 4.49 | 22.94 | 4.89 | 28.28 | 0.8111 |
SYP a | 5.11 | 22.66 | 5.17 | 27.60 | 0.821 |
4. Conclusions
- The additives such as ZB and UV stabilizers at the loading levels used have little effect on the EMC of WPCs under various RHs at 20 °C;
- The experimental data of EMC at various RHs fit to Nelson’s sorption isotherm model well and the model can be used to predict EMCs of WPCs under different RH environmental conditions;
- The EMC of WPCs is significantly lower than solid wood and other wood-based composites due to less wood content and partially encapsulation of the wood fiber by plastic in WPC.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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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. https://doi.org/10.3390/ma8010368
Liu F, Han G, Cheng W, Wu Q. Sorption Isotherm of Southern Yellow Pine—High Density Polyethylene Composites. Materials. 2015; 8(1):368-378. https://doi.org/10.3390/ma8010368
Chicago/Turabian StyleLiu, Feihong, Guangping Han, Wanli Cheng, and Qinglin Wu. 2015. "Sorption Isotherm of Southern Yellow Pine—High Density Polyethylene Composites" Materials 8, no. 1: 368-378. https://doi.org/10.3390/ma8010368