Correlation between degree of crystallinity, morphology, glass temperature, mechanical properties and biodegradation of poly (3-hydroxyalkanoate) PHAs and their blends

El-Hadi, Ahmed Mohamed; Schnabel, Rainer; Straube, E.; Müller, G.; Henning, Sven

doi:10.1016/s0142-9418(01)00142-8

Cited by 409 publications

(296 citation statements)

References 46 publications

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“…Polyhydroxybutyrate (PHB) is an alternative because it has similar biodegradability characteristics to those of conventional thermoplastics (Baltieri et al, 2003). However, use of PHB is limited because of its thermal instability, excessive brittleness, and high production cost compared with synthetic plastics (El-Hadi et al, 2002). Blending of PHB with other bio-degradable polymers appears a promising solution to these problems.…”

Section: Discussionmentioning

confidence: 99%

Production and characterization of poly-3-hydroxybutyrate from crude glycerol by Bacillus sphaericus NII 0838 and improving its thermal properties by blending with other polymers

Sindhu

Ammu

Binod

et al. 2011

Braz. arch. biol. technol.

112

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Section: Discussionmentioning

confidence: 99%

Production and characterization of poly-3-hydroxybutyrate from crude glycerol by Bacillus sphaericus NII 0838 and improving its thermal properties by blending with other polymers

Sindhu

Ammu

Binod

et al. 2011

Braz. arch. biol. technol.

112

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“…PHB is obtained from renewable resources (mainly sugar cane) by biotechnological processes of low environmental impact. Ongoing research, intended on establishing its properties, extending its applications, and optimizing its processing conditions is reported in the literature [1][2][3][4][5][6] . During their lifetime, polymer products may be subjected to aggressive environments, like high temperature, ultraviolet radiation and certain chemicals, with consequences like the deterioration of mechanical properties and/or poor surface appearance.…”

Section: Introductionmentioning

confidence: 99%

Environmental Stress Cracking of Poly(3-hydroxibutyrate) Under Contact with Sodium Hydroxide

et al. 2015

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Environmental stress cracking (ESC) is one of the most important causes of polymer premature failure, occurring when a combination of mechanical load and an aggressive fluid is applied. The phenomenon is well know by polymer producers and product designers but its mechanisms are not very well understood. Although the ESC effects of many commercial polymers are well known, this type of failure in biopolymers were not studied yet. In the current work, the stress cracking behaviour of poly(3-hydroxybutyrate) (PHB) with 4,0 and 6,2% of hydroxyvalerate (HV) was investigated in injection-moulded bars under contact with sodium hydroxide (NaOH) solutions. The experiments were conducted using two different types of stress arrangements: (i) an ordinary tensile testing and (ii) a relaxation experiment. In both situations the injection-moulded bars were exposed to the NaOH solution and some testing conditions where varied, like the cross-head speed of the tensile test and the maximum load of the relaxation arrangement. The results showed that NaOH acted as a strong stress cracking agent for PHB, causing surface cracking and reducing significantly the mechanical properties. Catastrophic failure with an extensive surface damage was also observed by photographed and scanning electron microscopy (SEM) images. The magnitude of the effects increased with decreasing crosshead speed and increasing loading level.

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“…Considering that the plastic-made products are in the center of many debates related to environmental issues, a current trend of the polymer community is the study of ways to reduce the environmental impact of these products [1][2][3][4][5] . Besides the development of materials with a better recyclability, the use of biodegradable polymers and plastics obtained from renewable sources are some of the main objectives to achieve this goal.…”

Section: Introductionmentioning

confidence: 99%

“…The general uses of PHB in replacement of ordinary plastics are growing, including applications like packing and other short life products like cups and cutleries for fast food restaurants. Due to its biodegradability, when discarded PHB can be attacked by microorganisms such as bacteria, and fungus which might be able to destroy its macromolecular chains producing CO 2 , CH 4 , H 2 O and microcellular organisms.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)

et al. 2016

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The present work is concerned with the photodegradation and photostabilization of poly(3-hydroxybutyrate) (PHB) biopolymer. Two commercial grades of PHB were investigated, containing of 4.0% and 6.2% of hydroxyvalerate (HV) comonomer, named PHB 1 and PHB 2 , respectively. Injection moulded specimens were exposed to ultraviolet radiation (UV-A) in the laboratory for periods of up to 12 weeks and then characterized by tensile testing, surface appearance, size exclusion chromatography (SEC), and scanning electron microscopy (SEM). The exposure to UV radiation caused great damaged on the surface color, reduction of molecular size and mechanical properties. The effects were more pronounced on PHB 2 , probably due a lighter surface color and less packed macromolecular structure which facilitates the transmission of light throughout the samples. Specimens of PHB 1 were also injected with the addition of a UV absorber and antioxidant, resulting in a higher UV stability of PHB, as shown by a low reduction in molar mass and better mechanical properties.

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Correlation between degree of crystallinity, morphology, glass temperature, mechanical properties and biodegradation of poly (3-hydroxyalkanoate) PHAs and their blends

Cited by 409 publications

References 46 publications

Production and characterization of poly-3-hydroxybutyrate from crude glycerol by Bacillus sphaericus NII 0838 and improving its thermal properties by blending with other polymers

Production and characterization of poly-3-hydroxybutyrate from crude glycerol by Bacillus sphaericus NII 0838 and improving its thermal properties by blending with other polymers

Environmental Stress Cracking of Poly(3-hydroxibutyrate) Under Contact with Sodium Hydroxide

Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)

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