Radiation effect on polyesters

Mitomo, Hiroshi; Watanabe, Yuhei; Yoshii, Fumio; Makuuchi, Keizo

doi:10.1016/0969-806x(95)00018-s

Cited by 42 publications

(20 citation statements)

References 12 publications

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“…However, Collett et al 169 have reported a method of minimizing the e †ects by careful reduction of the oxygen pressure during c-irradiation. Mitomo et al 170 have reported more recently on the e †ects of c-radiation on PHB and PHBV in air or a vacuum. They found that polymer scission and crosslinking occurred.…”

Section: Degradation Processesmentioning

confidence: 98%

A review of biodegradable polymers: uses, current developments in the synthesis and characterization of biodegradable polyesters, blends of biodegradable polymers and recent advances in biodegradation studies

Amass¹,

Amass²,

Tighe³

1998

Polym. Int.

920

488

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Section: Degradation Processesmentioning

confidence: 98%

A review of biodegradable polymers: uses, current developments in the synthesis and characterization of biodegradable polyesters, blends of biodegradable polymers and recent advances in biodegradation studies

Amass¹,

Amass²,

Tighe³

1998

Polym. Int.

920

488

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“…In this study, the crystalline regions of PHB remained almost unchanged after grafting, whereas the crystalline regions of PHBV in the PHBV-g-PMMA samples were partially destroyed by the introduction of grafting. 44 In addition, the irradiation method was also employed to prepare PHBV-g-poly(acrylic acid) (PAA) copolymers. 45 The glucosamine was covalently linked to the functionalized PHBV-g-PAA surface by carbodiimide chemistry, which reveals that the modified substrates are suitable for the additional conjugation of bioactive molecules.…”

Section: Modified Phas As Engineering Materials Z LI Et Almentioning

confidence: 99%

“…43 However, both PHB-g-PMMA and PMMA homopolymer were detected under this grafting mechanism. In another study, PHA-g-PMMA grafting copolymers were prepared by irradiation-induced radical polymerization 44 to determine the irradiation-dose-dependent grafting efficiency of MMA onto both PHB and PHBV. However, the higher crystallinity of the PHB compared with PHBV caused a lower degree of grafting for PHB-g-PMMA than PHBV-g-PMMA.…”

Section: Modified Phas As Engineering Materials Z LI Et Almentioning

confidence: 99%

Polyhydroxyalkanoates: opening doors for a sustainable future

2016

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Polyhydroxyalkanoates (PHAs) comprise a group of natural biodegradable polyesters that are synthesized by microorganisms. However, several disadvantages limit their competition with traditional synthetic plastics or their application as ideal biomaterials. These disadvantages include their poor mechanical properties, high production cost, limited functionalities, incompatibility with conventional thermal processing techniques and susceptibility to thermal degradation. To circumvent these drawbacks, PHAs need to be modified to ensure improved performance in specific applications. In this review, well-established modification methods of PHAs are summarized and discussed. The improved properties of PHA that blends with natural raw materials or other biodegradable polymers, including starch, cellulose derivatives, lignin, poly(lactic acid), polycaprolactone and different PHA-type blends, are summarized. The functionalization of PHAs by chemical modification is described with respect to two important synthesis approaches: block copolymerization and graft copolymerization. The expanded utilization of the modified PHAs as engineering materials and the biomedical significance in different areas are also addressed.

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“…Effective chemical modifications include changes in chemical group functionality, surface charge, hydrophilicity, and wettability. Investigation of surface modification can be achieved by means of various chemical or physical processes, including graft polymerization using oxygen plasma treatment , UV-induced photografting (Ma et al 2002), g-irradiation (Grondahl et al 2005;Mitomo et al 1995), and ozone treatment (Hu 2003;Yu et al 2006).…”

Section: Wettability Of Surfacesmentioning

confidence: 99%

Degradation of Natural and Artificial Poly[(R)-3-hydroxyalkanoate]s: From Biodegradation to Hydrolysis

Guérin

Renard

Langlois

2009

Microbiology Monographs

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Biodegradability of polymers has drawn much attention as a solution to problems concerning the global environment and biomedical technologies. Poly[(R)-3-hydroxybutyrate] and its copolymers are representative biodegradable polyesters which can be degraded in natural environments such as soil, sludge, freshwater, and seawater where many microorganisms utilize the degraded products as a carbon source. The ability to degrade poly[(R)-3-hydroxyalkanoate]s (PHAs) is widely distributed among fungi and bacteria and depends on the extracellular PHA depolymerases, which are carboxyesterases, and on the physical state of the polymer (amorphous or crystalline). Intracellular depolymerase systems lead to CO 2 and H 2 O when bacteria need energy or carbon sources. All polyesters are susceptible degradation by simple hydrolysis to some extent. The degradation rate is very dependent on the chemical structure and the crystallinity of the materials.

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Radiation effect on polyesters

Cited by 42 publications

References 12 publications

A review of biodegradable polymers: uses, current developments in the synthesis and characterization of biodegradable polyesters, blends of biodegradable polymers and recent advances in biodegradation studies

A review of biodegradable polymers: uses, current developments in the synthesis and characterization of biodegradable polyesters, blends of biodegradable polymers and recent advances in biodegradation studies

Polyhydroxyalkanoates: opening doors for a sustainable future

Degradation of Natural and Artificial Poly[(R)-3-hydroxyalkanoate]s: From Biodegradation to Hydrolysis

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