Rukchonlatee, Suparat

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Preferred name
Rukchonlatee, Suparat
Alternative Name
Rukchonlatee, S.
Main Affiliation
Email
suparat.ru@kmitl.ac.th

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    Photocrosslinked Poly(Vinyl Alcohol)–Tung Oil–Natural Rubber Films: A Sustainable Solution for Enhanced Water Resistance and Mechanical Properties in Biodegradable Packaging
    (2025-06-20)
    Monvisade, Pathavuth
    ;
    Jianprasert, Apichaya
    ;
    Sintoppun, Tanaporn
    ;
    Yamaguchi, Masayuki
    ;
    Rukchonlatee, Suparat
    This study introduces a novel approach to addressing the water resistance limitations of poly(vinyl alcohol) (PVA)-based biodegradable films by developing a ternary blend system incorporating tung oil (T) and natural rubber (R), forming PTR films. Photocrosslinking, combined with thermal and redox catalytic systems, facilitated the creation of enhanced network structures, as confirmed by FTIR analysis, particularly at tung oils conjugated double bonds. Dynamic mechanical analysis (DMA) revealed significant shifts in glass transition temperatures (T<inf>g</inf>), signifying enhanced crosslink density and interconnectivity between the components. The resulting PTR films demonstrated remarkable improvements in water resistance, evidenced by higher solid remain percentages, reduced water absorption, and significantly lower water vapor permeability (WVP). Mechanical properties, including tensile strength and Youngs modulus, improved by up to 150% (from 6.6 MPa of PT0R15-r-np to 16.3 MPa of PT0R15-r-p30) and 870% (from 6.6 MPa of PT0R15-r-np to 16.3 MPa of PT0R15-r-p30), respectively, due to the formation of robust network structures. Contact angle measurements and reduced moisture content further underscored the enhanced hydrophobic and moisture barrier properties. These findings establish photocrosslinked PTR films as a sustainable and high-performance option for biodegradable packaging applications, offering practical advantages such as reduced processing temperatures and production times.
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    Enhanced CO2/CH4 Permselectivity in Partially Hydrolyzed EVA Membranes via Synergistic PEG Plasticization and Amine-Functionalized Silica Incorporation
    (2026-03-27)
    Ritvirulh, Chonlada
    ;
    Wisatsuvan, Patchnakan
    ;
    Sooknoi, Tawan
    ;
    Rukchonlatee, Suparat
    The separation of carbon dioxide (CO2) from methane (CH4) in biogas is essential for increasing the fuel quality. However, conventional membrane-based separation under high pressure is not suitable for household biogas systems due to operational cost and complexity. This study aims to develop low-pressure gas separation membranes based on partially hydrolyzed ethylene vinyl acetate (p-E) copolymers by incorporating poly(ethylene glycol) (PEG) as a plasticizer and amine-functionalized silica (APTES-modified SiO2) as a polar filler. The hydrolysis of EVA improves mechanical strength by increasing hydrogen bonding. PEG addition enhances the free volume and CO2 affinity, while the well-dispersed surface-treated SiO2 increases membrane polarity and suppresses CH4 permeation. Among the tested membranes, the optimal formulation (p-EP400(15)-S0.6) containing 15 wt % PEG400 and 0.6 wt % APTES-SiO2 achieves the highest CO2/CH4 selectivity (∼22) and a high CO2 permeability (∼1400 g/m2·day). These findings demonstrate a promising strategy to develop effective membranes for biogas upgrading under ambient conditions.
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    Tubular EVA copolymer/SiO2/PEG composite membrane for CO2 removal from household biogas
    (2025-03-01)
    Watasit, Prachya
    ;
    Ausavasukhi, Artit
    ;
    Rukchonlatee, Suparat
    ;
    Sooknoi, Tawan
    ;
    Ritvirulh, Chonlada
    The fuel efficiency of household biogas is generally regulated by its CO<inf>2</inf> content (25%–50%). To improve its heating value, atmospheric CO<inf>2</inf> removal of household biogas using a polymeric membrane was attempted to avoid a complicated separation process. A tubular membrane of poly(ethylene-co-vinyl acetate), composed of 28% and 18% vinyl acetate (E28 and E18) modified with SiO<inf>2</inf> and polyethylene glycol (PEG), was fabricated by blown film extrusion. Model biogas containing CO<inf>2</inf>/CH<inf>4</inf> (40/60 v/v) was separated in an in-house continuous gas separation module, in which CO<inf>2</inf> was mainly permeated out of the tubular membrane at atmospheric pressure. Blending the E28 matrix with E18 (10 wt%) improves the membrane processability and inhibits the CH<inf>4</inf> permeation, leading to enhanced CO<inf>2</inf>/CH<inf>4</inf> selectivity (from ~2.3 to 2.9). Well-dispersed SiO<inf>2</inf> particles (0.5 wt%) increase the membrane modulus and suppress CH<inf>4</inf> loss. However, adding more SiO<inf>2</inf> (0.75–1.0 wt%) leads to higher total gas permeation flux with lower CO<inf>2</inf>/CH<inf>4</inf> selectivity due to particle agglomeration. Incorporation of PEG (0.5–1.5 wt%) increased the membrane polarity and CO<inf>2</inf> permeability. The CO<inf>2</inf>/CH<inf>4</inf> selectivity was also improved (~5.3), only up to 1.0 wt% PEG content. Highlights: Composite EVA/SiO2/PEG membrane separates CO<inf>2</inf>/CH<inf>4</inf> at atmospheric pressure. The concentration gradient across the membrane drives CO<inf>2</inf>/CH<inf>4</inf> permeation. Adding SiO<inf>2</inf> hinders CH<inf>4</inf> permeability and enhances CO<inf>2</inf>/CH<inf>4</inf> selectivity. Increasing PEG content enhances membrane polarity and interaction with CO<inf>2</inf>.