Browsing by Author "P. Threepopnatkul"

Now showing 1 - 6 of 6
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    Effect of EMA and antioxidants on properties of thermoplastic starch blown films
    (Institute of Physics Publishing, 2015) P. Threepopnatkul; C. Kulsetthanchalee; A. Sittattrakul; E. Kaewjinda
    The objectives of this study were to investigate the effect of poly(ethylene-co-methyl acrylate) (EMA) at 10, 30 and 50 wt% on the morphological properties, moisture sorption, water vapor permeability and biodegradability of thermoplastic starch (TPS). Urea and formamide were used as a mixed plasticizer. In addition, the effect of antioxidants namely, 3,5-di-tert-butyl-4-hydroxyhydrocinnamate (DTBH), butylated hydroxytoluene (BHT) and bis(octadecyl)hydroxylamine (BOH) at 1 wt% on the properties of TPS/EMA film was investigated. TPS/EMA films were produced by a blown film molding machine and characterized by scanning electron microscropy, moisture sorption, water vapor permeability and biodegradability measurement. Results found that the increment of EMA content in the TPS matrix could improve the water sorption, water vapor permeability and biodegradability properties of TPS/EMA films. For biodegradation, the weight loss of the blended films was directly proportional to TPS content. Regarding the antioxidants effect, the water vapor permeability of TPS/EMA films containing DTBH was higher than the one with BOH and BHT. However, the antioxidants contributed little to the biodegradability of TPS/EMA films and had no effect on the moisture sorption of TPS/EMA films.
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    Effect of glass fiber length and content on mechanical properties of polybutylene terephthalate
    (Chulalognkorn University, 2017) P. Threepopnatkul; N. Sukprasurt; P. Santiwiparat; W. Prom-Oh; C. Kulsetthanchalee; P. Threepopnatkul; Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, Thailand; email: s.poonsubt@gmail.com
    The effect of glass fiber (GF) length and content were studied on mechanical properties of polybutylene terephthalate (PBT). The glass fiber was found to be highly compatible with PBT. The PBT/6 mm GF 30% composite possessed the highest flexural modulus (FM) and flexural strength (FS). The FM and FS were increased with the increasing of GF content. The longer glass fiber resulted in the higher value of FM and FS but hardly affected on the deflection and unnotched izod impact strength of the composites. The impact strength of composites was drastically decreased with the addition of glass fiber as compared with neat PBT.
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    Flame retarding improvement of nylon 6,6 composites with zeolite
    (European Conference on Composite Materials, ECCM, 2014) P. Threepopnatkul; R. Mukkayadechochai; W. Jarunavin; W. Khamkhly; C. Kulsetthanchalee
    In this research, the effects of types and contents of zeolite were investigated on flammability of Nylon 6, 6. Different zeolite types such as 3A, 4A and 5A at the content of 5, 10 and 15% by weight were compounded with Nylon 6, 6 by using twin-screw extruder. Flammability of samples was characterized with limiting oxygen index (LOI), vertical burning test (UL94) and thermogravimetric analysis. LOI of Nylon 6, 6 composites with zeolite 5A was higher than Nylon 6, 6 composites with zeolite 3A and 4A, respectively. Testing UL94 of virgin Nylon6, 6 showed dripping as classified V-2 type while Nylon6, 6 composites with 15% wt of zeolite 3A, 4A, 5A had no dripping which was classified as V-0 type. Moreover, the addition of zeolite in Nylon6, 6 led to relatively lower thermal degradation compared to neat Nylon 6, 6 especially for the case of Nylon 6, 6 with zeolite type of 4A.
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    Improvement properties of recycled polypropylene by reinforcement of coir fiber
    (Trans Tech Publications Ltd, 2009) P. Threepopnatkul; C. Kulsetthanchalee; K. Bunmee; N. Kliaklom; W. Roddouyboon; P. Threepopnatkul; Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology, Silpakom University, Nakom-pathom 73000, Thailand; email: poonsubt@yahoo.com
    This research was to study the related mechanical and thermal properties of recycled polypropylene from post consumer containers reinforced with coir fiber. Surface of coir fiber was treated with sodium hydroxide to remove lignin and hemicelluloses and likely to improve the interfacial adhesion in the composites. The composites of treated coir fiber and recycled polypropylene were prepared by varying the coir fiber contents at 5%, 10% and 20% by weight using a twin screw extruder. The thermal properties were investigated by thermal gravimetric analysis (TGA) and differential scanning calorimeter (DSC). The results from TGA showed that thermal stability of the composites was lower than that of recycled polypropylene resin and thermal stability decreased with increasing coir fiber content. From DSC results, it indicated that the crystallinity of treated coir fiber composites increased as a function of fiber content. The mechanical properties of injection-molded samples were studied by universal testing machine. The treated coir fiber composites produced enhanced mechanical properties. The tensile strength, tensile modulus and impact strength of modified coir fiber/recycled polypropylene composites increased as a function of coir fiber content.
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    Study of surface treatment of pineapple leaf fiber (PALF) on performance of PALF/ABS composites
    (European Conference on Composite Materials, ECCM, 2012) P. Threepopnatkul; T. Krachang; W. Teerawattananon; K. Suriyaphaparkorn; C. Kulsetthanchalee; P. Threepopnatkul; Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom 73000, Thailand; email: poonsubt@yahoo.com
    This research is to study the influence of surface treatment for pineapple leaf fiber (PALF) on the mechanical properties of PALF reinforced ABS composites (ABS/PALF). PALF was pretreated with sodium hydroxide (PALF/NaOH), cellulase enzyme treatment and modified with N-2(aminoethyl) 3-aminopropyl trimethoxysilane (PALF/silane) to improve interfacial strength of the composites. PALF with different surface treatment methods were characterized using Fourier Transform Infrared and Scanning Electron Microscopy technique. The composites were tested mechanical properties by Universal Testing machine. The results show that the modified PALF composites lead to the enhancement of mechanical properties such as young's modulus. Young's modulus is the highest for PALF/NaOH/Cellulase composites. PALF/silane composites possessed the highest tensile strength and impact strength among all the treated system.
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    Thermal and barrier properties of poly(butylene adipate-coterephthalate) incorporated with zeolite doped potassium ion for packaging film
    (Institute of Physics Publishing, 2020) P. Threepopnatkul; K. Wongsuton; C. Jaiaue; N. Rakkietwinai; C. Kulsetthanchalee; P. Threepopnatkul; Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, 73000, Thailand; email: poonsubt@yahoo.com
    In this research, the works were focused on development of film packaging of poly(butylene adipate-co-terephthalate) (PBAT) incorporated with modified zeolite using (3-aminopropyl) trimethoxysilane. PBAT composites were compounded by melt mixing using twin screw extrusion then molded into film by cast film extrusion process. Effects of zeolite 13X at 1 wt% and zeolite doped potassium ion (K+) on thermal properties, permeability of gases (oxygen, carbon dioxide and water vapor) and also absorption of ethylene gas of PBAT composites films have been studied. Typically, zeolite would act as a nucleating agent. Therefore, adding zeolite would increase the degree of crystallinity of PBAT. Comparing zeolite with and without cation exchange, the degree of crystallinity in film tended to increase for the one doped with potassium ion. Either zeolite with or without potassium exchange had no impact on thermal stability of composite films. Gas permeation of PBAT/zeolite film possessed lower permeation of oxygen and carbon dioxide whereas the water vapor transmission showed relatively higher rate than the neat PBAT. After cation exchange with zeolite, the permeation of oxygen and carbon dioxide has reduced 21.04% and 21.90% respectively but the effect of K+ exchange had no effect on water vapor transmission compared with PBAT. Film of PBAT and zeolite doped with cation could absorb ethylene gas more than the one with zeolite. © Published under licence by IOP Publishing Ltd.