Moisture movement in wood polypropylene composites

Cheng, Qiuming; Shaler, Stephen M.

doi:10.1007/s00107-009-0391-4

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…The results showed that the composites prepared by the co-extrusion technique had better dimensional stability and mechanical properties. Cheng and Shaler (2010) compared the differences in water movement among extruded WPCs under the actions of high humidity, freshwater, and seawater; they determined the moisture diffusion coefficient of the thin sample under high humidity and that of small cubic samples immersed in distilled water and seawater. The results showed that the diffusion coefficient of the thin sample was higher than the moisture movement rate in the extruded profile, indicating that the material featured other transport phenomena besides diffusion.…”

Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance analysis of water absorption characteristics and dynamic changes in pore size distribution of wood-plastic composites

Jin

Zhu

et al. 2021

BioRes

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Low-field nuclear magnetic resonance (NMR) technology was used to perform the experiments of transverse relaxation time (T2), pore size distribution, and water absorption rate for wood-plastic composites (WPC) with different contents of added slag powder, exploring the water movement and the dynamic changes of pore size during the moisture absorption process of the material under immersion condition. The experimental results were as follows: (1) According to the T2 of H proton and its inversion pattern, the measured porosity had a relatively small difference from that of the weighing method. (2) The pore size distribution graph showed the following: (i) when the immersion time of composite materials was different, the changing law of volume of pores with different radius was different.; (ii) when the material’s immersion time was greater than 216 h, the pore radius and its distribution characteristics showed large differences; (iii) slag powder changed the pore structure of the WPC but did not change the water absorption characteristics of the wheat straw. (3) The changes of water absorption and expansion rate showed that the slag powder changed the time for the materials’ pores to absorb water until saturation and reduced the water absorption and expansion rate. The measurement results were consistent with changing trend in the pore size obtained by low-field NMR relaxometry.

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Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance analysis of water absorption characteristics and dynamic changes in pore size distribution of wood-plastic composites

Jin

Zhu

et al. 2021

BioRes

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show abstract

“…The majority of research concerning the durability of WPCs has been experimental, centering on the characterization of moisture-induced reductions in mechanical properties [3,[8][9][10], thickness swelling [4,11], rates of water transport [12][13][14], and the fungal resistance [5,11] of synthetic polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) matrix composites. Poor freeze-thaw resistance of WPCs has also been noted as a primary durability concern [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%