Effects of Environmental Aging on the Durability of Wood-Flour Filled Recycled PET/PA6 Wood Plastic Composites

Outdoor building materials made of wood require preservatives containing chromated copper arsenate and other carcinogenic substances but still are subject to decay, hence they need to be replaced every few years. Wood-plastic composite (WPC) is an environmental-friendly composite of wood flour/fiber...

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Bibliographic Details
Published in:Journal of polymers and the environment 2022-04, Vol.30 (4), p.1300-1313
Main Authors: Chiou, Yung-Chuan, Shen, Ming-Yuan, Chiang, Chin-Lung, Li, Yi-Luen, Lai, Wei-Min
Format: Article
Language:English
Subjects:
Aging
Arsenates
Building materials
Butadiene
Carcinogens
Chemistry
Chemistry and Materials Science
Chromated copper arsenate
Construction materials
Copolymers
Copper arsenate
Copper chrome arsenate
Creep tests
Durability
Elastomers
Environmental Chemistry
Environmental conditions
Environmental Engineering/Biotechnology
Fiber reinforced plastics
Fiber reinforced polymers
Flour
Graft copolymers
Impact modifiers
Industrial Chemistry/Chemical Engineering
Maleic anhydride
Materials Science
Mechanical properties
Moisture content
Original Paper
Plastics
Polyamide resins
Polyamides
Polyethylene
Polyethylene terephthalate
Polymer blends
Polymer Sciences
Polymers
Polymethyl methacrylate
Preservatives
Styrene
Thermal properties
Thermodynamic properties
Water content
Weathering
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Summary:Outdoor building materials made of wood require preservatives containing chromated copper arsenate and other carcinogenic substances but still are subject to decay, hence they need to be replaced every few years. Wood-plastic composite (WPC) is an environmental-friendly composite of wood flour/fiber reinforced thermoplastic polymers (i.e., plastic). As WPC is made of plastic to evenly cover the wood flour, it has a lower moisture content than wood. In this study, maleic anhydride grafted polyolefin elastomers (POE-g-ma) and methyl methacrylate-butadiene-styrene copolymer (MBS) were used as impact modifiers to prepare WPCs from recycled polyethylene terephthalate (rPET) and recycled polyamide 6 (rPA6) blends (PET/PA6). The thermal properties of the WPCs with different mixing ratio polymer blends of rPET to rPA6 (E60/A40, E50/A50, and E40/A60) were investigated, as well as their mechanical properties after accelerated weathering. In addition, the creep behavior of the E40/A60 WPC under different environmental conditions was investigated. During the 10-h creep test, the POE-g-ma/WPC strain varied significantly more than MBS/WPC under environmental aging and higher loadings. The test results of impact and creep also show that the toughening effect of POE-g-ma/WPC was slightly better than that of MBS/WPC. In summary, the higher PET content resulted in lower flowability and a higher initial decomposition temperature, with the E60/A40 WPC having better anti-aged mechanical properties and more suitable for outdoor building applications.
ISSN:1566-2543
1572-8919
DOI:10.1007/s10924-021-02268-2