Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites

Holzforschung ◽  
2012 ◽  
Vol 66 (8) ◽  
pp. 981-987 ◽  
Author(s):  
Chia-Huang Lee ◽  
Ke-Chang Hung ◽  
Yong-Long Chen ◽  
Tung-Lin Wu ◽  
Yi-Chi Chien ◽  
...  
Keyword(s):  
Exposure Time ◽  
High Density Polyethylene ◽  
Moisture Absorption ◽  
Surface Oxidation ◽  
Moisture Diffusion ◽  
High Density ◽  
Modulus Of Rupture ◽  
Wood Plastic Composites ◽  
Surface Cracking ◽  
Plastic Composites

Abstract The purpose of this work is to compare the weathering properties of different types of wood-plastic composites (WPCs) based on high-density polyethylene (HDPE), recycled high-density polyethylene (rHDPE-I and rHDPE-II), low-density polyethylene (LDPE), polypropylene (PP), recycled polypropylene (rPP), polystyrene (PS), and recycled polystyrene (rPS). The modulus of rupture (MOR) and modulus of elasticity (MOE) of all WPCs decreased with increasing exposure time of weathering. Of these, the rHDPE-II-based composite exhibited the highest MOR and MOE retention ratios after 2000 h of accelerated ultraviolet (UV) weathering, while the PS-based WPC had the lowest values. In addition, the carbonyl index difference (CID) of various WPCs increased significantly as a function of exposure time. Among them, the PS-based WPCs exhibited the most severe degradation due to photo-oxidation on the surface, while the degradation of PE-based WPCs was the mildest. These results are consistent with the change in the surface cracking and flexural properties of the composites. The PS-based WPCs also exhibited higher moisture diffusion coefficients. The mechanical behavior of WPCs after weathering is influenced by a combination of factors, such as surface oxidation, morphology changes, and moisture absorption.

Weathering of High-Density Polyethylene-Wood Plastic Composites

2013 ◽  
Vol 34 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Ljerka Kratofil Krehula ◽  
Zvonimir Katančić ◽  
Anita Ptiček Siročić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
High Density Polyethylene ◽  
High Density ◽  
Wood Plastic Composites ◽  
Plastic Composites

scholarly journals Manufacturing and Characterization of Environmentally Friendly Wood Plastic Composites Using Pinecone as a Filler into a Bio-Based High-Density Polyethylene Matrix

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4462
Author(s):  
Maria del Carmen Morcillo ◽  
Ramón Tejada ◽  
Diego Lascano ◽  
Daniel Garcia-Garcia ◽  
David Garcia-Sanoguera
Keyword(s):  
High Density Polyethylene ◽  
Filler Content ◽  
High Density ◽  
Polyethylene Matrix ◽  
Wood Plastic Composites ◽  
Matrix Interaction ◽  
Plastic Composites ◽  
Wide Range ◽  
Injection Molded

The use of wood plastic composites (WPC) is growing very rapidly in recent years, in addition, the use of plastics of renewable origin is increasingly implemented because it allows to reduce the carbon footprint. In this context, this work reports on the development of composites of bio-based high density polyethylene (BioHDPE) with different contents of pinecone (5, 10, and 30 wt.%). The blends were produced by extrusion and injection-molded processes. With the objective of improving the properties of the materials, a compatibilizer has been used, namely polyethylene grafted with maleic anhydride (PE-g-MA 2 phr). The effect of the compatibilizer in the blend with 5 wt.% has been compared with the same blend without compatibilization. Mechanical, thermal, morphological, colorimetric, and wettability properties have been analyzed for each blend. The results showed that the compatibilizer improved the filler–matrix interaction, increasing the ductile mechanical properties in terms of elongation and tensile strength. Regarding thermal properties, the compatibilizer increased thermal stability and improved the behavior of the materials against moisture. In general, the pinecone materials obtained exhibited reddish-brown colors, allowing their use as wood plastic composites with a wide range of properties depending on the filler content in the blend.

Effects of PMDI Modified on Physico-Mechanical Properties of Silvergrass Reinforced High Density Polyethylene Composites

2013 ◽  
Vol 750-752 ◽  
pp. 38-42
Author(s):  
Wang Wang Yu ◽  
Juan Li ◽  
Yun Ping Cao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Water Absorption ◽  
High Density Polyethylene ◽  
High Density ◽  
Hydroxyl Groups ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Methylene Diphenyl Diisocyanate

In this study, the silvergrass (SV) was used to reinforce HDPE composites. The effects of polymeric methylene diphenyl diisocyanate (PMDI) content, slivergrass fibers content on the mechanical, water absortion of wood plastic composites (WPCs) were investigated. It was found that the mechanical properties of the SV reinforced HDPE composites can be improved by PMDI treatment. The highest tensile strength and flexural strength of the composites can be reached with 50% SV contents at the SV: PMDI=6:1. It has been proved that the hydroxyl groups of SV fibers which can react with the-NCO by FTIR. It also can be concluded that the water absorption of PMDI treated WPCs was lower than untreated ones.

Dynamic and Static Properties of Wood-Plastic Composites Made of Recycled High-Density Polyethylene

2010 ◽  
Vol 658 ◽  
pp. 475-478 ◽  
Author(s):  
Gui Wen Yu ◽  
Ying Cheng Hu ◽  
Ji You Gu
Keyword(s):  
Young’S Modulus ◽  
High Density Polyethylene ◽  
Young's Modulus ◽  
High Density ◽  
Bending Test ◽  
Wood Plastic Composites ◽  
Dynamic Young’S Modulus ◽  
Plastic Composites ◽  
Dynamic Young's Modulus ◽  
Recycled Hdpe

Three different nondestructive testing (NDT) methods were used on the wood-plastic composites (WPC), which were made of either recycled or virgin high-density polyethylene (HDPE) with poplar fibers as filler. The values of dynamic Young’s modulus of WPC based on recycled or virgin HDPE were measured by the different NDT methods, and the values of static bending modulus of elasticity (MOE) were also determined by three point bending test according to ASTM D790-03. The paper analyzed the variability of the dynamic young’s modulus of WPC based on recycled or virgin HDPE obtained with different NDT methods, and the correlativity was also estimated between the dynamic Young’s modulus and the static MOE of WPC based on recycled HDPE. These results suggest that WPC can be made of recycled HDPE, and the NDT methods can be appropriate to estimate the dynamic Young’s modulus of WPC based on recycled HDPE.

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