Biodegradability and Biodegradation of Polyesters

Tokiwa, Yutaka; Calabia, Buenaventurada P.

doi:10.1007/s10924-007-0066-3

Cited by 251 publications

(157 citation statements)

References 45 publications

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“…Polyhydroxybutyrate (PHB), one type of PHA polymer, is probably the most extensively studied biodegradable thermoplastic polymer. However, practical application of PHB has often been limited by its narrow processing window and brittleness [6][7][8]. Careful control of the fermentation conditions and the feeding of carbon source used has led to the synthesis of a variety of PHA copolymers, including poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), with improved physical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Before their applications can be widespread, comprehensive studies on the biodegradability and degradation mechanisms of these polymers are necessary. Up to now, there has been lots of research on the degradation of PHAs or PHA blended with other materials in a marine environment [11,12], tropical mangrove ecosystem [13], soil environment [14][15][16][17], enzyme solution [18][19][20], and microbial environment [21][22][23]. Different degradation behaviors of PHAs were found in different degradation processes, even for a same polymer.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Properties and Biodegradability Studies of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

et al. 2011

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For investigating the relationship between thermal properties and biodegradability of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), several films of PHBV containing different polyhydroxyvalerate (HV) fractions were subjected to degradation in different conditions for up to 49 days. Differential scanning calorimetry (DSC), thermogravimetry (TG), specimen weight loss and scanning electron microscopy (SEM) were performed to characterize the thermal properties and enzymatic biodegradability of PHBV. The experimental results suggest that the degradation rates of PHBV films increase with decreasing crystallinity; the degradability of PHBV occurring from the surface is very significant under enzymatic hydrolysis; the crystallinity of PHBV decreased with the increase of HV fraction in PHBV; and no decrease in molecular weight was observed in the partially-degraded polymer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Properties and Biodegradability Studies of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

et al. 2011

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“…주요 폴리에스테르로는 폴리 하이드록시부틸산(poly 3-hydroxybutylate, PHB), 폴리 부틸렌 숙신산(poly butylene succinate, PBS), 폴리 L-락타이드(poly L-lactide, PLA), 폴리 에틸 렌 숙식산(poly ethylene succinate, PES) 등이 있다 [6]. 이중에서 폴리 부틸렌 숙식산(poly bu-tylene succinate, PBS)는 유연성 과 가공성이 우수하고 높은 충 격강도와 열 저항성 등 물성이 우수하다 [7,8].…”

Section: 서 론unclassified

A Study on Morphology and Mechanical Properties of Biodegradable Polymer Nanocomposites

Jang¹

2013

Clean Technology

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and PLA/PBS (90/10)/Clay-20 nanocomposites were prepared by injection molding. Thermal, mechanical, morphological and raman spectral properties of two nanocomposites were investigated by differential scanning calorimetry (DSC), tensile tester, scanning electron microscopy (SEM) and raman-microscope spectrophotometer, respectively. In addition, hydrolytic degradation properties of two nanocomposites were investigated by hydrolytic degradation test. It was confirmed that the crystallinity of PLA/Clay-20 and PLA/PBS/Clay-20 nanocomposite was increased with increasing Clay-20 content and the Clay-20 is miscible with PLA and PLA/PBS resin from DSC and SEM results. Tensile strength of two nanocomposites was decreased, but thier elongation, impact strength, tensile modulus and flexural modulus were increased with an increase of Clay-20 content. The impact strength of PLA/Clay-20 and PLA/PBS/Clay-20 nanocomposites with 5 wt% of Clay-20 content was increased above twice than that of pure PLA and PLA/PBS (90/10). The hydrolytic degradation rate of PLA/Clay-20 nanocomposite with 3 wt% of Clay-20 content was accelerated about twice than that of pure PLA. The reason is that degradation may occur in the PLA and Clay-20 interface easily because of hydrophilic property of organic Clay-20. It was confirmed that a proper amount of Clay-20 can improve the mechanical properties of PLA and can control biodegradable property of PLA

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“…The physical and chemical properties, monomer composition and the number and size of the granules are varied according to the microorganism (Anderson et al, 1990;Ha and Cho, 2002). PHA materials have the ability to biodegradation in various environments, including soil, sea water and lake water (Tokiwa and Calabia, 2007).…”

Section: Introductionmentioning

confidence: 99%

Identification, Biodegradation and bio-evaluation of biopolymer produced from Bacillus thuringenesis

2017

J App Pharma Sci

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Poly3-hydroxybutyric acid (PHB) is a promising eco-friendly substance favorable for medical use. PHB was produced from local isolate Bacillus thuringienesis in a conc. 4.1 g/L using 30 g/L Sugar-cane molasses (SCM) at pH 7.5 and incubation temperature 35 o C. PHB biodegradation by soil microorganisms were completed after four weeks. Cell cytotoxicity testing is one of the critical factors affecting the biomedical application of polymers. 50% cell cytotoxic concentration (IC50) = 130 mg/mL while non -toxic concentration was 12.5 mg/mL studying of direct contact application between biopolymer and peripheral blood lymphocytes resulting monomers have no toxic effect on the cells.

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Biodegradability and Biodegradation of Polyesters

Cited by 251 publications

References 45 publications

Thermal Properties and Biodegradability Studies of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Thermal Properties and Biodegradability Studies of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

A Study on Morphology and Mechanical Properties of Biodegradable Polymer Nanocomposites

Identification, Biodegradation and bio-evaluation of biopolymer produced from Bacillus thuringenesis

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