Chaishome, Jedsada

Preferred name

Chaishome, Jedsada

Alternative Name

Chaishome, J.

Main Affiliation

School of Engineering

jedsada.ch@kmitl.ac.th

Now showing 1 - 8 of 8

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Thermal degradation of flax fibres as potential reinforcement in thermoplastic composites
(2014-03-19)
Chaishome, J.
;
Brown, K. A.
;
Brooks, R.
;
Clifford, M. J.
This work reports on a study of thermal degradation of flax fibres to gain an improved understanding of the use and limitations of flax fibres as reinforcement for thermoplastic composites manufactured by the vacuum forming process. The effect of heating on chemical decomposition and thermal stability was performed, using fourier transform infrared spectrometry (FTIR) and thermogravimetry (TG) techniques. In addition, the characterisation of micro structures of failure surface following tensile testing of the composites was conducted. The results show that the hemicelluloses decomposition of flax fibres during thermal degradation is a factor to have the detrimental effect on the thermal stability of fibres, particularly with low heating rate. The present investigation, A decrease of hemicellulose and pectin content of the fibres, a decrease of consolidation temperature and an increase of heating rate during the manufacturing of flax fibre thermoplastic composites should improve their mechanical performance. © (2014) Trans Tech Publications, Switzerland.
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The influence of alkaline treatment of plant fibres on tensile properties of single fibres and composites
(2017-01-01)
Chaishome, J.
;
Rattanapaskorn, S.
The hypothesis pursued in this work is that by removing hemicellulose and pectin from plant fibres by alkaline treatment, the fibre tensile performance could be improved. Flax fibres were examined as reinforcement. The highest ultimate tensile strength (UTS) resulted for fibre treated with 3% by weight of NaOH solution (up to 12% increase in UTS and 18% increase in Young’s modulus, compared to untreated fibres). A 15% reduction in cross-sectional area of the fibres was observed. Tensile performance of treated (a percentage of fibre volume fraction (V<inf>f</inf> %) of 30%) and untreated (V<inf>f</inf> % of 34%) fibre reinforced polypropylene composites manufactured by the vacuum forming process, were compared. A decrease of UTS and Young’s modulus of the treated material was observed with an increase in consolidation time. The UTS of the treated material was 3.82% lower than that of the untreated material.
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Ripening control of nam dok mai mango (Mangifera indica Linn.) with titanium dioxide
(2019-01-01)
Chaishome, Jedsada
;
Tunsathitsak, Yossakorn
;
Boonyaritthongchai, Panida
;
Supapvanich, Suriyan
— This research aims to slow down the release of ethylene of ‘Nam Dok Mai’ mango during shipment transportation by using titanium dioxide as an absorbent. The result found that the mango begin to the ripening process after stored at 13°C for 12 days (ethylene and carbon dioxide around 0.06910 µL C2H4/kg.hr and 32.10 mg CO2/kg.hr, respectively). Then, the appropriate titanium dioxide was tested by trial at 3, 5 and 10 grams. The result showed that titanium dioxide decreased ethylene but each treatment were not statistically different (p <0.05). Afterward, all fruits were stored at 13°C for 14 days and at 25°C for 4 days, respectively. The physical and chemical properties of fruit were analyzed during storage time. After 14 days at 13°C, firmness, color, titratable acidity, pH, total soluble solids and ripening index of the treatments of titanium dioxide and control treatment were significant different. After 4 days at 25°C, the ripening process of fruit between titanium dioxide treatment and control treatment were not significant differences.
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Polylactic acid (PLA) based green composites reinforced pineapple leaf fibres: Evaluation of processing and tensile performance
(2018-08-14)
Chaishome, Jedsada
;
Supapvanich, Suriyan
This paper reports on a study of the compression moulding and the vacuum forming of unidirectional pineapple leaf fibres/polylactic acid composites and the influence of process variables on the tensile properties of the material. The characterisation of the micro and meso structures of the pineapple leaf fibres is reported. The effect of consolidation temperature on the fibre thermal stability and the tensile properties of the composites is investigated. The results show that vacuum forming was found to be preferable process with high stiffness modulus and UTS of the composites, compared to compression moulding. The insignificant detrimental effect of 165°C high consolidation temperature was observed. Finally, the fibre thermal degradation seems to dominate the composite tensile performance over its interfacial quality between the fibre and the matrix.
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Tensile properties of PLA/PBAT blends and PLA fibre-reinforced PBAT composite
(2018-08-14)
Sritham, Eakasit
;
Phunsombat, Phakaimat
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Chaishome, Jedsada
The tensile properties of PLA/PBAT blends, PLA fibre reinforced PBAT composite (PLAF) at room temperature and -18°C were investigated. The concentrations of PLA in the blends were 10%, 20%, 30% and 40% (by volume). There was an improvement of elastic modulus (E) for PLA/PBAT blends when PLA was 40%. There was no significant difference of ultimate tensile strength (UTS) among the blends. For the same concentration of PLA (40%) in PLA-PBAT mixture, PLAF exhibited higher values of E and UTS than that of PLA/PBAT blends. Elongation of PLA/PBAT blends rapidly decreased upon the addition of PLA to the blends. The values of E and UTS for PLA/PBAT blends and composite, neat PLA, and PP increased with the decreasing of temperature from room temperature to -18°C. The effect of decreasing temperature was not observed on elongation. It was appeared from the results obtained for FTIR and DSC measurements that PLA and PBAT were immiscible, separating into two phases.
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Effect of alkaline treatment on decomposition temperature of fibres from empty oil palm bunch
(2019-01-01)
Chaishome, Jedsada
;
Nunak, Navaphattra
—This article reports an investigation of the decomposition temperature of fibres from empty oil palm bunch to achieve improved understanding of the processing temperature limitation of this fibre as reinforcement for thermoplastic composite manufacturing. The effect of alkaline treatments on their chemical decomposition and sample weight changes were performed, using fourier transform infrared spectrometry (FTIR) and thermogravimetry (TG) techniques. The results show that the hemicellulose removal of fibres after treatment is a factor that provides an advantage on the thermal stability of the fibres. Both initial decomposition temperature (T<inf>0</inf>) and maximum decomposition temperature (T<inf>max</inf>) are minor increase. This could reduce the detrimental effect of thermal degradation on the single fibre performance and leads to shift its consolidation temperature ceiling from below 221<sup>o</sup>C (untreated fibres) to 243<sup>o</sup>C (5% NaOH treated fibres) during composite consolidation.
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Alleviation of internal browning in queen pineapple fruit by peduncle infiltration with solutions of methyl jasmonate during cold storage
(2019-01-01)
Chaishome, Jedsada
;
Srimuk, Sutikarn
;
Supapvanich, Suriyan
— The effect of methyl jasmonate solution (MeJA) and methyl jasmonate gel on procreation internal browning (IB) of ‘Trad-see-thong’ pineapple (‘Queen’ group) fruit was investigated. The pineapple fruit were peduncle-infiltrated parallel with 1 mM MeJA, 1 mM and 10 mM MeJA-gel, then stored at 10°C for 12 days. The results showed that internal browning symptom of pineapple fruit with treatment was visible following 4 days of storage. On day 12 of storage, control treatment (no solution), internal browning score of 4 (almost maximum score), that was significantly higher than other treatments (p < 0.05). The 1 mM MeJA solution had internal browning score of 3.8, expected that the amount of MeJA solution with peduncle-infiltration in pineapple fruit had too exorbitant (overdose). Moreover, the 1 mM and 10 mM gel-treated had internal browning score of 3.2 and 3.4, respectively. It was found that the amount of MeJA solution with peduncle-infiltration in pineapple fruit is able to alleviate better than the other. The 1 mM and 10 mM MeJA-gel had lightness in pulp tissues significantly higher than other groups worthy 44.95 and 46.74, respectively.
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The influence of alkaline treatment on thermal stability of flax fibres
(2017-04-25)
Chaishome, J.
;
Rattanapaskorn, S.
The paper pursued the hypothesis that alkaline treatment removed hemicellulose and pectin from the flax fibres, the fibre thermal stability will be improved. The use of plant fibres as reinforcement in thermoplastic composites comes with the detrimental effect of thermal degradation on the tensile performance of fibres and composites, particularly during long consolidation times at high temperature. SEM was used to observe the treated fibre surface. The micrographs show that the treatment with a higher concentration of NaOH solution results in a more obviously rough fibre surface. Moreover, FTIR and TGA were used to examine the chemical decomposition and thermal stability, respectively. The spectra of treated materials indicate that both hemicellulose and pectin were dissolved from the fibre surface following treatment. Finally, TGA results revealed that the loss of mass belonging to hemicellulose and pectin in treated fibres results in a shift of the main degradation temperature to higher temperature.
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Chaishome, Jedsada

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