PROPERTIES OF RICE STRAW FLOUR AND RECYCLED POLYPROPYLENE COMPOSITES EXPOSED TO ACCELERATED WEATHERING

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KORD B.

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Journal: Journal of Wood and Forest Science and Technology Year:2016 | Volume:23 | Issue:SUPPLEMENT 1 Page(s): 181-196

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Title

PROPERTIES OF RICE STRAW FLOUR AND RECYCLED POLYPROPYLENE COMPOSITES EXPOSED TO ACCELERATED WEATHERING

Author(s)

KORD B. | Issue Writer Certificate

Keywords

RECYCLED POLYPROPYLENEQ2

ACCELERATED WEATHERINGQ1

MECHANICAL STRENGTHQ1

THERMAL STABILITYQ1

COLOR CHANGEQ2

Abstract

Background and objectives: Wood-plastic composites (WPCs) are increasingly used for non-structural applications in the automotive, furniture and building industries. Despite remarkable progresses in manufacturing and processing technologies for WPCs products, the application of WPCs in an outdoor environment is still a major concern. Exposure of WPCs to varying environmental conditions such as moisture, temperature and UV radiation results in changes to the structure of these materials. Consequently, the COLOR CHANGE, loss of aesthetic appeal and mechanical property, and decrease of their performance applications have been affected. This research was carried out to investigate on the effect of weathering on the mechanical, thermal and color properties of rice straw flour (RF) and virgin/RECYCLED POLYPROPYLENE (VPP or RPP) composites.Materials and methods: Rice straw flour (RF) was mixed with both virgin and RECYCLED POLYPROPYLENE (VPP or RPP) and MAPP at 180 °C and 60 rpm in an internal mixer, and the samples were made by injection molding. The ratio of PP was 50% based on oven-dry weight of RF. The amount of coupling agent was fixed at 2% for all formulations. ACCELERATED WEATHERING of samples was conducted in a xenon arc-type light exposure apparatus for 2000 hours. Finally, the mechanical and thermal properties and color measurement of samples were tested, and compared with control samples (unweathered).Results: Results indicated that the flexural strength and tensile modulus of samples decreased with the increase in weathering exposure time. The color of composites sharply changed after ACCELERATED WEATHERING, and the lightness of samples increased. Differential scanning calorimetriy (DSC) test revealed that the THERMAL STABILITY of composites (the melting temperature, crystallization temperature and crystallinity) decreased with increase in weathering exposure time, due to the polymer chain scission deterioration by photdegradation process. The highest lightness and COLOR CHANGE in the RF/RPP composites was observed. However, the VPP samples showed higher MECHANICAL STRENGTH and THERMAL STABILITY than RPP.Conclusion: The findings showed that the RF/RPP composites had lower durability against weathering compared with other ones.

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APA: Copy

KORD, B.. (2016). PROPERTIES OF RICE STRAW FLOUR AND RECYCLED POLYPROPYLENE COMPOSITES EXPOSED TO ACCELERATED WEATHERING. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 23(SUPPLEMENT 1), 181-196. SID. https://sid.ir/paper/156845/en

Vancouver: Copy

KORD B.. PROPERTIES OF RICE STRAW FLOUR AND RECYCLED POLYPROPYLENE COMPOSITES EXPOSED TO ACCELERATED WEATHERING. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2016;23(SUPPLEMENT 1):181-196. Available from: https://sid.ir/paper/156845/en

IEEE: Copy

B. KORD, “PROPERTIES OF RICE STRAW FLOUR AND RECYCLED POLYPROPYLENE COMPOSITES EXPOSED TO ACCELERATED WEATHERING,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 23, no. SUPPLEMENT 1, pp. 181–196, 2016, [Online]. Available: https://sid.ir/paper/156845/en

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