Changes in diad sequence distribution by preferential chain scission during the thermal hydrolysis of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

Rajaratanam, Dhurga Devi; Ariffin, Hidayah; Hassan, Mohd Ali; Nishida, Haruo

doi:10.1038/pj.2016.28

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Above 160 °C (i.e., above the melting point), the molecular weight decreased significantly. Kabe et al reported that a significant P(3HB) molecular weight reduction occurred during the thermoforming process, and Dhurga et al reported a similar tendency in the thermal hydrolysis of P(3HB- co -5.5 mol %-3HHx). Therefore, the fact that this material can be melt-spun below the melting point is crucial for PHA, which has low thermal stability during the melting process.…”

Section: Resultsmentioning

confidence: 99%

“…48 The reaction rate constant k was calculated using Nishida's method, 47 and the Arrhenius plot was obtained considering lnk and 1/T (Figure S4). The activation energy E a was calculated as 100.5 kJ/mol, which is close to the reported E a values for P(3HB) (122.5 kJ/ mol) 48 , P(3HB-co-5.5 mol %-3HHx) (90.6 kJ/mol) 47 and P(3HB-co-16 mol %-4HB) (127.0 kJ/mol). 49 Therefore, the thermal stability of P(3HB-co-16 mol %-4HB) was nearly identical to that of the P(3HB) homopolymer and P(3HB-co-5.5 mol %-3HHx).…”

Section: In Situ Waxd Experiments With Dscmentioning

confidence: 92%

“…The linear relationship between lnM w and the melting time (Figure 4b) suggests that the thermal decomposition proceeds via autocatalytic random decomposition. 48 The reaction rate constant k was calculated using Nishida's method, 47 and the Arrhenius plot was obtained considering lnk and 1/T (Figure S4). The activation energy E a was calculated as 100.5 kJ/mol, which is close to the reported E a values for P(3HB) (122.5 kJ/ mol) 48 , P(3HB-co-5.5 mol %-3HHx) (90.6 kJ/mol) 47 and P(3HB-co-16 mol %-4HB) (127.0 kJ/mol).…”

Section: In Situ Waxd Experiments With Dscmentioning

confidence: 99%

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Elastic Marine Biodegradable Fibers Produced from Poly[(R)-3-hydroxybutylate-co-4-hydroxybutylate] and Evaluation of Their Biodegradability

Omura

Komiyama

Maehara

et al. 2021

ACS Appl. Polym. Mater.

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Marine biodegradable fibers with high strength and elasticity were successfully fabricated from microbial polyesters using a melt-spinning method. Polymers were melted at temperatures lower than the constituent melting temperatures, and the obtained fibers were stretched at room temperature. The molecular weights of the fibers processed by this melt-spinning method remained unchanged, suggesting that the developed approach is very effective for polyhydroxyalkanoates, which typically exhibit low thermal stability during the melting process. The obtained fibers had tensile strengths >200 MPa and elongation at break of ∼200%, making them comparable to nonbiodegradable elastic fibers processed from polyethylene and polypropylene. It was confirmed that these fibers were completely degraded by both seawater from Tokyo Bay and freshwater from Sanshiro Pond after less than 1 month. Interestingly, periodically stacked lamellar structures of 200 nm that comprised at least 30 lamellae were generated following the biodegradation of the amorphous region of the fiber surface.

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Section: Resultsmentioning

confidence: 99%

Section: In Situ Waxd Experiments With Dscmentioning

confidence: 92%

Section: In Situ Waxd Experiments With Dscmentioning

confidence: 99%

See 1 more Smart Citation

Elastic Marine Biodegradable Fibers Produced from Poly[(R)-3-hydroxybutylate-co-4-hydroxybutylate] and Evaluation of Their Biodegradability

Omura

Komiyama

Maehara

et al. 2021

ACS Appl. Polym. Mater.

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Modification of cellulose degree of polymerization by superheated steam treatment for versatile properties of cellulose nanofibril film

et al. 2020

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Cellulose from oil palm empty fruit bunch (OPEFB) was subjected to superheated steam (SHS) treatment at 150 °C for 1 and 2 h to produce cellulose with different degree of polymerization (DP). The treated OPEFB cellulose was subjected to a wet disc milling process to produce cellulose nanofibrils (CNFs), followed by nanocellulose film production using castingevaporation technique. Reduction of DP by 23 and 40% were recorded after SHS treatment of OPEFB cellulose for 1 h (SHS1) and 2 h (SHS2), respectively, as compared to the untreated OPEFB cellulose. CNFs produced from treated cellulose (CNF-SHS1 and CNF-SHS2) exhibited smaller diameter and were less entangled compared to CNF from untreated cellulose (CNF-UT). These contributed to smoother CNF-SHS films. The highest light transmittance was recorded for CNF-SHS2 film, followed by CNF-SHS1 and CNF-UT films. The increment in transmittance value is in accordance with the reduction in cellulose DP. Lower DP also caused CNF-SHS films to have less wetting property as a result of smoother film surface. Mechanical properties were affected by DP values suggesting the possibility to control mechanical properties of CNF films in relation to DP. Overall, SHS is an efficient treatment method to reduce cellulose DP with the advantage of controlling CNF film properties towards the production of a versatile CNF film.

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Studies on the alcoholysis of poly(3-hydroxybutyrate) and the synthesis of PHB-b-PLA block copolymer for the preparation of PLA/PHB-b-PLA blends

Don

Liao

2018

J Polym Res

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Changes in diad sequence distribution by preferential chain scission during the thermal hydrolysis of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

Cited by 4 publications

References 17 publications

Elastic Marine Biodegradable Fibers Produced from Poly[(R)-3-hydroxybutylate-co-4-hydroxybutylate] and Evaluation of Their Biodegradability

Elastic Marine Biodegradable Fibers Produced from Poly[(R)-3-hydroxybutylate-co-4-hydroxybutylate] and Evaluation of Their Biodegradability

Modification of cellulose degree of polymerization by superheated steam treatment for versatile properties of cellulose nanofibril film

Studies on the alcoholysis of poly(3-hydroxybutyrate) and the synthesis of PHB-b-PLA block copolymer for the preparation of PLA/PHB-b-PLA blends

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