Rukchonlatee, Suparat

Preferred name

Alternative Name

Rukchonlatee, S.

Main Affiliation

School of Science

suparat.ru@kmitl.ac.th

Now showing 1 - 6 of 6

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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>.
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High Density Polyethylene/Calcium Silicate Hybrid Composite: Preparation, Characterization and In Vitro Bioactivity
(2023-01-01)
Siriphannon, Punnama
;
Rukchonlatee, Suparat
The high density polyethylene/calcium silicate (HDPE/CS) hybrid composites were prepared using a twin-screw extruder and shaped into test specimens using a compression molding machine. The CS loadings, limited to a total of 20 %vol, were incorporated in HDPE matrix. The morphological behavior, thermal behavior, mechanical properties and bioactivity of the composites were investigated and compared with the neat HDPE under identical conditions. It was found that poor dispersion of the CS particles was observed in the composites with high CS loadings because of only weak interaction between CS particles and HDPE. The percentage of HDPE crystallinity was insignificantly changed when adding CS particles in the HDPE/CS composites. The stiffness of the HDPE/CS hybrid composites was strongly improved and reached the maximum values of flexural and compressive moduli at 1190 MPa (35% greater than the neat HDPE) and 581 Ma (17% greater than the neat HDPE), respectively, with 15 % CS loading. The higher the CS loading, the greater the hardness of the HDPE/CS composites were seen. However, the flexural strength of the HDPE/CS composites (up to 15% CS loading) was not considerably altered. Moreover, both flexural and compressive properties were lowered with higher CS content (20%) due to the generated voids in the HDPE/CS composites. After soaking in simulated body fluid (SBF) at 36.5°C for 7–49 days, the HDPE/CS composites could induce the formation of ball-like HA aggregates covering on the composite surface, indicating its bioactivity. This research successfully prepared HDPE/CS hybrid composites with fast rate bioactivity and their modulus and strength values were within those for human trabecular bone. Therefore, the HDPE/CS hybrid composites had potentially used as bioactive materials for medical applications.
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Facile Preparation of Montmorillonite/Crosslinked Chitosan Containing Potassium Nitrate Nanocomposites as Eco-Friendly Slow Release Fertilizers
(2023-08-01)
Rukchonlatee, Suparat
;
Siriphannon, Punnama
Montmorillonite/tripolyphosphate crosslinked chitosan containing potassium nitrate nanocomposites (MMT/CS-KNO3-TPP) were synthesized by facile incipient wetness impregnation method. The MMT was impregnated stepwise with a mixture of protonated chitosan and KNO<inf>3</inf>, followed by a TPP solution to ionically crosslink with chitosan, resulting in MMT/CS-KNO3-TPP nanocomposites. The initial quantity of KNO<inf>3</inf> to MMT was varied from 0 to 10, 20, and 30 wt%, and the TPP crosslinker was varied according to TPP:chitosan weight ratios of 0:5, 1:5, and 3:5. The resultant MMT/CS-KNO3-TPP nanocomposites composed of the K+ and NO<inf>3</inf>− ions embedded in crosslinked chitosan which intercalated in the MMT basal spacing and covered on MMT external surface. The structure of these nanocomposites could effectively slow the K+ and NO<inf>3</inf>− releases, with the 72- hours cumulative released values (%R) ranging from 20–34% for K+ to 0.4–1.0% for NO<inf>3</inf>−. The MMT/CS-KNO3-TPP nanocomposites with higher TPP concentration could extend the K+ and NO<inf>3</inf>− release times. Total K+ release times were predicted to be in the range of 128–204 days. The presence of MMT/CS-KNO3-TPP nanocomposites in RD43 rice cultivation could promote the growth of RD43 seedlings and roots. Furthermore, the TPP crosslinked chitosan showed physical changes in distilled water, indicating its potential as a long-term nitrogen (N) and phosphorus (P) source for plant nutrients.
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Atmospheric CO2/CH4 permeability of EVA copolymer/SiO2 composite membrane for biogas purification
(2021-09-10)
Watasit, Prachya
;
Rukchonlatee, Suparat
;
Ausavasukhi, Artit
;
Ritvirulh, Chonlada
;
Sooknoi, Tawan
The CO<inf>2</inf> and CH<inf>4</inf> permeabilities of poly(ethylene-co-vinyl acetate) (EVA)/SiO<inf>2</inf> composite membrane were investigated at atmospheric pressure. The membranes were fabricated by compression molding and characterized by Fourier transformed infrared spectroscopy, differential scanning calorimetry, a universal testing machine, and a contact angle analyzer. The effect of vinyl acetate content (18–33 wt%) wasevaluated for both single-gas and mixed-gas permeation systems. A non-pressurized homemade-permeation cell was used for the single-gas permeation of CO<inf>2</inf> and CH<inf>4</inf>, while a tubular membrane was utilized for a continuous separation of CO<inf>2</inf>/CH<inf>4</inf> mixture. CO<inf>2</inf> flux was readily increased (from 0.7 to 2.0 ml/m2.s) with vinyl acetate content (18–33 wt%). The enhanced CO<inf>2</inf> permeability is attributed to the increase in polarity and also the decrease in crystallinity of the membrane. A satisfied gas separation selectivity (CO<inf>2</inf>/CH<inf>4</inf>) of 4.31 could be obtained from tubular membrane with 28 wt% VA content. The incorporation of SiO<inf>2</inf> as a filler (0.5–2.0 wt%) especially increased the membrane polarity and hence the CO<inf>2</inf> flux up to 6.0 ml/m2.s. However, the CH<inf>4</inf> flux was not affected by VA and SiO<inf>2</inf> contents.

Rukchonlatee, Suparat

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