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Dive into the research topics where Sommai Pivsa-Art is active.

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Featured researches published by Sommai Pivsa-Art.


Science and Technology of Advanced Materials | 2005

Synthesis and characterization of nanoporous, nanorods, nanowires metal oxides

Sorapong Pavasupree; Yoshikazu Suzuki; Sommai Pivsa-Art; Susumu Yoshikawa

Abstract Mesoporous high surface area and high crystallinity MO2 (M=Ti, Ce, Zr, and Hf) and their mixed oxides powders were synthesized by a modified sol–gel method using laurylamine hydrochloride, metal alkoxide and acetylacetone. The prepared powders had a crystalline size of about 5–15 nm, a specific surface area of 44–80 m2/g, and a narrow pore size distribution with average pore diameter of about 3–6 nm. One-dimensional (1D) nanostructured (nanorods and nanowires) metal oxides were also successfully synthesized. These synthesis methods provide simple routes to fabricate nanostructured materials under mild conditions. These materials are promising forchemical and energy-related applications such as catalysts, and semiconductors in dye-sensitized solar cell.


IOP Conference Series: Materials Science and Engineering | 2015

Grafting of poly (lactic acid) with maleic anhydride using supercritical carbon dioxide

Rattikarn Khankrua; Sommai Pivsa-Art; Hamada Hiroyuki; Supakij Suttiruengwong

The aim of this work was to modify poly lactic acid (PLA) via free radical grafting with maleic anhydride (MA) by using supercritical carbon dioxide (SCCO2). Benzoyl peroxide (BPO) was used as an initiator. The solubility of MA in SCCO2 was first determined to estimate the suitable grafting conditions and equilibrium. From the solubility study of MA in SCCO2, it was found that the solubility of MA in SCCO2 increased with the increasing pressure and dissolution time. PLA films were first prepared by compression molding. The ratio of MA to BPO was 2:1. The reaction temperature and pressure were 70°C and 100 bar respectively. The grafting reaction and the degree of grafting were characterized by nuclear magnetic resonance (NMR) spectroscopy and titration, respectively. Scanning electron microscope (SEM) technique and contact angle were used to confirm the changes in physical properties of PLA film grafted MA. NMR spectrum indicated that the grafting of MA onto PLA was successively achieved. Degree of grafting by using SCCO2 was as high as 0.98%. This provided rather high grafting degree compared with other processes. SEM pictures showed the rough surface structure on modified PLA film. In addition, contact angle results showed an improvement of the hydrophilicity by maleic anhydride grafting onto polymers.


PROCEEDINGS OF PPS-29: The 29th International Conference of the Polymer Processing Society - Conference Papers | 2014

Crystallization kinetics and thermal resistance of bamboo fiber reinforced biodegradable polymer composites

Supaphorn Thumsorn; Natee Srisawat; J. Wong On; Sommai Pivsa-Art; Hiroyuki Hamada

Bamboo fiber reinforced biodegradable polymer composites were prepared in this study. Biodegradable poly(butylene succinate) (PBS) was blended with bamboo fiber in a twin screw extruder with varied bamboo content from 20-0wt%. PBS/bamboo fiber composites were fabricated by compression molding process. The effect of bamboo fiber contents on properties of the composites was investigated. Non-isothermal crystallization kinetic study of the composites was investigated based on Avrami equation. The kinetic parameters indicated that bamboo fiber acted as heterogeneous nucleation and enhanced crystallinity of the composites. Bamboo fiber was well dispersed on PBS matrix and good adhered with the matrix. Tensile strength of the composites slightly deceased with adding bamboo fiber. However, tensile modulus and impact strength of the composites increased when increasing bamboo fiber contents. It can be noted that bamboo fiber promoted crystallization and crystallinity of PBS in the composites. Therefore, the compo...


Journal of Polymers | 2014

Cyclic Oligolactic Acid in Direct Polycondensation PLLA and Its Extraction with Organic Solvent

Keiichiro Nomura; Yuta Nakatsuchi; Ryugo Shinmura; Sommai Pivsa-Art; Weraporn Pivsa-Art; Yuji Aso; Hitomi Ohara

The contents of poly(L-lactic acid) (PLLA) prepared by direct condensation polymerization without using a catalyst were studied. 1H NMR and mass spectrometry analyses suggested that PLLA contained cyclic oligo(L-lactic acid) (c-OLLA) with 3–20 repeat units. Notably, only c-OLLA was extracted and isolated using hexane or cyclohexane at 4°C; thus the hydrophobicity, topology, and temperature dependence of the solubility of the obtained PLLA enabled the selective extraction of c-OLLA. The effect of cyclic compounds on direct polycondensation and the potential for c-OLLA to form molecular inclusion complexes were also discussed.


Materials | 2018

Hydrophilic and Hydrophobic Mesoporous Silica Derived from Rice Husk Ash as a Potential Drug Carrier

Supakij Suttiruengwong; Sommai Pivsa-Art; Metta Chareonpanich

This work describes the preparation of mesoporous silica by the green reaction of rice husk ash (RHA) with glycerol, followed by the modification and the potential use as a drug carrier. The reaction was carried out at 215 °C for 2 h. The solution was further hydrolyzed with deionized water and aged for various times (24, 48, 120, 360, 528 and 672 h) before calcinations at 500 °C for 24 h. Further treatment of prepared mesoporous silica was performed using trimethylmethoxysilane (TMMS) to obtain hydrophobic Mesoporous silica. For all synthesized silicas, silica contents were as high as 95 wt %, whereas organic residues were less than 3 wt %. RHA-glycerol showed the highest specific surface area with smallest pore diameter (205.70 m2/g, 7.46 nm) when aged for 48 h. The optimal hydrolysis-ageing period of 120 h resulted in 500.7 m2/g specific surface area, 0.655 cm3/g pore volume and 5.23 nm pore diameter. The surface modification of RHA-glycerol occurred through the reaction with TMMS as confirmed by FTIR (Fourier-transform infrared spectroscopy). Ibuprofen was selected as a model drug for the adsorption experiments. The adsorption under supercritical CO2 was carried out at isothermal temperature of 40 °C and 100 bar; % ibuprofen loading of TMMS modified mesoporous silica (TMMS-g-MS) was 6 times less than that of mesoporous silica aged for 24 h (MS-24h) due to the hydrophobic nature of modified mesoporous silica, not surface and pore characteristics. The release kinetics of ibuprofen-loaded mesoporous silicas were also investigated in vitro. The release rate of ibuprofen-loaded MS-24h was much faster than that of ibuprofen-loaded TMMS-g-MS, but comparable to the crystalline ibuprofen. The slower release rate was attributed to the diffusion control and the stability of hydrophobic nature of modified silica. This would allow the design of a controlled release drug delivery system.


Materials | 2018

Facile Preparation and Characterization of Short-Fiber and Talc Reinforced Poly(Lactic Acid) Hybrid Composite with In Situ Reactive Compatibilizers

Phornwalan Nanthananon; Manus Seadan; Sommai Pivsa-Art; Hiroyuki Hamada; Supakij Suttiruengwong

Hybrid composites of fillers and/or fibers reinforced polymer was generally produced by masterbatch dilution technique. In this work, the simplified preparation was introduced for the large volume production of 30 wt % short-fiber and talcum reinforced polymer hybrid composite by direct feeding into twin-screw extruder. Multifunctional epoxide-based terpolymer and/or maleic anhydride were selected as in situ reactive compatibilizers. The influence of fiber and talcum ratios and in situ reactive compatibilizers on mechanical, dynamic mechanical, morphological and thermal properties of hybrid composites were investigated. The morphological results showed the strong interfacial adhesion between fiber or talcum and Poly(lactic acid) (PLA) matrix due to a better compatibility by reaction of in situ compatibilizer. The reactive PLA hybrid composite showed the higher tensile strength and the elongation at break than non-compatibilized hybrid composite without sacrificing the tensile modulus. Upon increasing the talcum contents, the modulus and storage modulus of hybrid composites were also increased while the tensile strength and elongation at break were slightly decreased compared to PLA/fiber composite. Talcum was able to induce the crystallization of PLA hybrid composites.


The International Journal of Advanced Culture Technology | 2015

Scale-Up of Polymerization Process of Biodegradable Polymer Poly(lactic acid) Synthesis Using Direct Polycondensation Method

Sommai Pivsa-Art; Sumonman Niamlang; Weraporn Pivsa-Art; Nutchapon Santipatee; Tossamon Wongborh; Sorapong Pavasupree; Kiyoaki Ishimoto; Hitomi Ohara

Environmental problems from petroleum-based plastic wastes have been rapidly increasing in recent years. The alternative solution is focus on the development of environmental friendly plastic derived from renewable resource. Poly(lactic acid) (PLA) is a biodegradable polymer synthesized from biomass having potential to replace the petroleum-based non-degradable polymers utilizations. PLA can be synthesized by two methods: (1) ring-opening of lactide intermediate and (2) direct polycondensation of lactic acid processes. The latter process has advantages on high yields and high purity of polymer products, materials handling and ease of process treatments. The polymerization process of PLA synthesis has been widely studied in a laboratory scale. However, the mass scale production using direct polycondensation of lactic acid has not been reported. We have investigated the kinetics and scale-up process of direct polycondensation method to produce PLA in a pilot scale. The order of reaction is 2 and activation energy of lactic acid to lactic acid oligomers is 61.58 kJ/mol. The pre-polymer was further polymerized in a solid state polymerization (SSP) process. The synthesized PLA from both the laboratory and pilot scales show the comparable properties such as melting temperature and molecular weight. The appearance of synthesized PLA is yellow-white solid powder.


Journal of Solid State Chemistry | 2005

Synthesis and characterization of vanadium oxides nanorods

Sorapong Pavasupree; Yoshikazu Suzuki; Athapol Kitiyanan; Sommai Pivsa-Art; Susumu Yoshikawa


Journal of Solid State Chemistry | 2005

Preparation and characterization of mesoporous TiO2–CeO2 nanopowders respond to visible wavelength

Sorapong Pavasupree; Yoshikazu Suzuki; Sommai Pivsa-Art; Susumu Yoshikawa


Ceramics International | 2005

Preparation and characterization of mesoporous MO2 (M = Ti, Ce, Zr, and Hf) nanopowders by a modified sol–gel method

Sorapong Pavasupree; Yoshikazu Suzuki; Sommai Pivsa-Art; Susumu Yoshikawa

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Weraporn Pivsa-Art

Rajamangala University of Technology Thanyaburi

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Sorapong Pavasupree

Rajamangala University of Technology Thanyaburi

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Hitomi Ohara

Kyoto Institute of Technology

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Narongchai O-Charoen

Rajamangala University of Technology Thanyaburi

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Hideki Yamane

Kyoto Institute of Technology

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Natee Srisawat

Rajamangala University of Technology Thanyaburi

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