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Wood Plastic Composites Prepared from Biodegradable Poly（butylene succinate） and Burma Padauk Sawdust （Pterocarpus macrocarpus）： Water Absorption Kinetics and Sunlight Exposure Investigations

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Journal of Bionic Engineering 2017年第4期14卷 781-790页

作者： Nawadon Petchwattana jakkid sanetuntikul Paranee Sriromreun Borwon Narupai Division of Polymer Materials Technology Faculty of Agricultural Product Innovation and Technology Srinakharinwirot University Ongkharak Nakhon Nayok 26120 Thailand Faculty of Engineering and Technology King Mongkut's University of Technology North Bangkok Bankhai Rayong 21120 Thailand Department of Chemical Engineering Faculty of Engineering Srinakharinwirot University Ongkharak Nakhon Nayok 26120 Thailand Expert Centre of Innovative Materials Thailand Institute of Scientific and Technological Research Pathum Thani 12120 Thailand

Wood plastic biocomposites of biodegradable poly（butylene succinate）（PBS） and Padauk sawdust was successfully pre- pared by using a twin screw extruder and an injection molding machine. The effects of water absorption and sunlight exposure on some properties of the composites were investigated. Water absorption of PBS composites was found to follow the Fick＇s law of diffusion, while the diffusion coefficient increased with increasing wood content. Maximum water absorption of around 4.5% was observed at 30 wt.% sawdust. Optical micrograph indicated the swelling of wood particles by around 1% - 3% after 30 days of water immersion. The tensile and flexural strengths reduced slightly both under the water immersion and sunlight exposure. After 90 days of exposure, the composites clearly looked paler than the non-weathered ones. Thermal scan indicated the re- duction of crystalline region due to the plasticization effect derived from water molecules.

关键词： wood plastic composites biodegradable polymers Fickian diffusion mechanical properties environmental deg-radation

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A Circular Economy Use of Post-Consumer Polypropylene Packaging for Low Thermal Conductive and Fire-Retardant Building Material Applications

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Journal of Renewable Materials 2023年第9期11卷 3567-3582页

作者： jakkid sanetuntikul Borwon Narupai Nawadon Petchwattana Faculty of Engineering and Technology King Mongkut’s University of Technology North BangkokRayong21120Thailand Expert Center of Innovative Materials Thailand Institute of Scientific and Technological ResearchPathum Thani12120Thailand Department of Chemical Engineering Faculty of EngineeringSrinakharinwirot UniversityNakhon Nayok26120Thailand

Wastes from polypropylene(PP)packages are accumulating every year because it is one of the most widely consumed and short lifecycle *** paper aims to develop low thermal conductive and fire-retardant materials from post-consumer PP(pPP)*** polyphosphate(APP)and hollow glass microsphere(HGM)were further added to improve the fire retardancy and thermal conductivity of *** influence of APP and HGM on the mechanical and thermal properties,fire retardancy and thermal conductivity of pPP were investigated and compared with that of virgin PP(vPP).HGM was constantly added at 5 wt%while the content of APP was varied from 5 to 20 wt%.Experimental results showed that the tensile and flexural strengths were reduced with increasing APP concentrations.A morphological study confirmed the poor interfacial adhesion and debonding of each component during the applied *** containing APP less than 10 wt%did not show a satisfying fire retardancy rating due to the long self-extinguishing *** flame dipping and cotton ignition were observed for these *** 15 and 20 wt%APP,the fire rating was significantly improved from no rating to *** conductive heat transfer coefficient(k)was reduced by the presence of *** on these results,the formulation with 15 and 20 wt%could be used as a low k,fire-retardant building material.

关键词： Post-consumer polypropylene recycling hollow glass microsphere thermal conductivity fire retardancy

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Transformation of β to α phase of isotactic polypropylene nucleated with nano styrene butadiene rubber-based β-nucleating agent under microwave irradiation

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Journal of Central South University 2018年第12期25卷 3098-3106页

作者： Nawadon PETCHWATTANA Phisut NAKNAEN jakkid sanetuntikul Division of Polymer Materials Technology Faculty of Agricultural Product Innovation and TechnologySrinakharinwirot University Division of Food Science and Nutrition Faculty of Agricultural Product Innovation and TechnologySrinakharinwirot University Faculty of Engineering and Technology King Mongkut's University of Technology North Bangkok

This paper investigates the effect of microwave irradiation on theβtoαphase transformation of theβ-nucleated isotactic polypropylene(iPP).Ten microwave irradiation cycles was applied to the iPP and iPP modified with 0.3 wt%and 0.5 wt%β-NA,and the data at 2nd,4th,6th,8th and 10th irradiation were *** expected,the sample temperature was found to increase with the irradiation time,by more than 130°C,due to high frequency of microwave *** was the major factor that induced theβ-phase transformation and structural *** the differential scanning calorimetry(DSC)and X-ray diffraction(XRD)results indicated thatβ-phase was mainly transformed toα-phase and partially converted to the amorphous *** was reflected as 1)the reduction of the enthalpy ofβ-crystal melting(ΔHmβ),2)the increased enthalpy ofα-crystal melting(ΔHmα),3)the decreasedβ-crystalline phase fraction(Kβ)and 4)the decrease of the overall degree of crystallinity(Xall).Under impact force,neat iPP showed a slight increase in the impact strength with the irradiation time,due to the increase of amorphous *** theβ-iPP,it decreased due to the reduction of theβ-phase content.

关键词： polypropylene crystallization mechanical properties thermal properties

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