Browsing by Author "Amnard Sittattrakul"

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    Effect of bacterial cellulose on properties of poly(lactic acid)
    (Elsevier Ltd, 2017) Poonsub Threepopnatkul; Amnard Sittattrakul; Karn Supawititpattana; Panat Jittiarpon; Phumin Raksawat; Chanin 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
    The aim of this research is to study the mechanical and thermal properties of composites based on poly(lactic acid) (PLA) by using bacterial cellulose (BC) as a reinforcement. BC is produced by Acetobacterxylinum. To improve the interfacial adhesion between the BC and PLA matrix, BC is treated with different types of silane coupling agents (BC: Silane = 1: 0.00943) namely 3-aminopropyltrimethoxysilane (APS), N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (DMS) and N1-(3-trimethoxysilyl propyl) diethylenetriamine (TMS). PLA is also modified with maleic anhydride (MA) in order to improve the electrophilicity property of PLA. In this work, reactive composites of BC reinforced PLA are prepared using a melt compounding process with twin screw extruder and injection molding machine. The effect of various silane coupling agents of 3 types and various contents of BC (1, 3, 5wt%) on mechanical and thermal properties are studied by using universal testing machine, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The DSC analysis is shown that the addition of BC particles significantly affect the crystallization rate of PLA because BC particles can act as a nucleating agent. The addition of 5 wt% BC to PLA provides more crystalline region than BC addition of 3 wt% and 1 wt% to PLA. Moreover, PLA composite with BC modified by TMS has the highest crystalline volume, followed by the DMS and APS, respectively. Young's modulus of PLA/5 wt% BC-TMS composite has the greatest increase compared with neat PLA. Moreover, PLA composites with BC treated by DMS have higher modulus than the one that is treated with APS. � 2017 Elsevier Ltd. All rights reserved.
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    Morphological and mechanical properties of LDPE film incorporated with sweet basil oil
    (Applied Mechanics Laboratory, 2020) Poonsub Threeponatkul; Amnard Sittattrakul; Chanin Kulsetthanchalee; Jutiporn Sukata; Thitiporn Daowadueng; Phooreerat Tawai
    The consumption of the plastic materials for packagings in everyday life has been increased. Low density polyethylene (LDPE) is a primary polymer for film packaging production. One of the innovative film developments is fragrant film with essential oil as additive. However, essential oil is easy to evaporate during process and thus _-cyclodextrin is required for retaining the essential oils. In addition, compatibilizer such as polyethylene-graft-maleic anhydride (PE-g-MA) is necessary to enhance the miscibility between polymer and additives. The effect of compatibilizer on morphological and mechanical of LDPE thin films incorporated with sweet basil oil is investigated. The _- cyclodextrin, sweet basil oil and PE-g-MA as compatibilizer are compounded with LDPE using twin-screw extruder. Miscibility of LDPE and _-cyclodextrin is studied by Fourier transform infrared spectroscopy. It is confirmed that interaction between _-cyclodextrin and PE-g-MA has taken place. Films are produced by cast-film extruder and then are characterized by universal testing machine. Young's modulus, tensile strength and elongation at break of LDPE film with sweet basil oil has been increased compared with neat LDPE film. © CCM 2020 - 18th European Conference on Composite Materials. All rights reserved.