Types of Biodegradable Polymers

Ashter, Syed Ali

doi:10.1016/b978-0-323-39396-6.00005-1

Cited by 25 publications

(13 citation statements)

References 72 publications

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“…TPS is similar to other synthetic polymers (in terms of structure, molar mass, glass transition temperature, crystallinity, melting temperature, etc.). However, it melts and fluidizes in the presence of a low molecular plasticizer such as water or glycerol, high temperatures and shearing, being suitable for injection moulding, extrusion and blowing facilities, in the same way as synthetic plastics [ 6 ]. Similar to starches, proteins are macromolecules with continuous and cohesive matrices, receiving enormous attention for the production of biodegradable plastic, edible films and sheets [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Mould Temperature on Rice Bran-Based Bioplastics Obtained by Injection Moulding

et al. 2021

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The high production rate of conventional plastics and their low degradability result in severe environmental problems, such as plastic accumulation and some other related consequences. One alternative to these materials is the production of oil-free bioplastics, based on wastes from the agro-food industry, which are biodegradable. Not only is rice bran an abundant and non-expensive waste, but it is also attractive due to its high protein and starch content, which can be used as macromolecules for bioplastic production. The objective of this work was to develop rice-bran-based bioplastics by injection moulding. For this purpose, this raw material was mixed with a plasticizer (glycerol), analysing the effect of three mould temperatures (100, 130 and 150 °C) on the mechanical and microstructural properties and water absorption capacity of the final matrices. The obtained results show that rice bran is a suitable raw material for the development of bioplastics whose properties are strongly influenced by the processing conditions. Thus, higher temperatures produce stiffer and more resistant materials (Young’s modulus improves from 12 ± 7 MPa to 23 ± 6 and 33 ± 6 MPa when the temperature increases from 100 to 130 and 150 °C, respectively); however, these materials are highly compact and, consequently, their water absorption capacity diminishes. On the other hand, although lower mould temperatures lead to materials with lower mechanical properties, they exhibit a less compact structure, resulting in enhanced water absorption capacity.

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Section: Introductionmentioning

confidence: 99%

Effects of Mould Temperature on Rice Bran-Based Bioplastics Obtained by Injection Moulding

et al. 2021

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“…PHBs are produced under physiologic stress. The polymer is a product of carbon assimilation and is used as a source of energy in the absence of conventional energy sources [39]. The synthesis of PHB in a bacterium begins with the condensation of two acetyl CoA into acetoacetyl CoA.…”

Section: Polyhydroxyalkanoates (Pha Phb Phbv)mentioning

confidence: 99%

“…The poor and limiting mechanical properties can be resolved by incorporating monomeric units of hydroxyvalerate into PHB to produce polyhydroxybutyrate-covalerate (PHBV) [39]. PHBV is a natural thermoplastic linear aliphatic polyester that is provided under the growth limiting conditions by actions of bacteria [43].…”

Section: Polyhydroxyalkanoates (Pha Phb Phbv)mentioning

confidence: 99%

Development of Bio-Based and Biodegradable Plastics

Adrah¹,

Ananey-Obiri²,

Tahergorabi³

2020

Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications

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“…in biomedical products, textiles, agriculture and household use, etc. [4]). Among these applications, food packaging is gaining increasing popularity, together with construction and consumer products [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Composition on Processability and Water Absorption of Wheat Gluten-Based Bioplastics

et al. 2020

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The nature of the plasticizer fraction within a bioplastic matrix is of extreme importance. Thus, brittleness has sometimes been observed when water has been used. The goal of the present manuscript has been to assess the effects of the addition of sucrose and trehalose in gluten-based bioplastics either in presence or absence of water. It was found that the role of the disaccharides in the samples studied depended on whether water was present or not in the formulation. Therefore, when water was included in the formulation together with glycerol, sugars were solubilized within the aqueous fraction, and then played a plasticizer role in the bioplastics. In that case, lower torque and temperatures during mixing, as well as lower viscoelastic properties and greater water absorption ability were generally observed in the presence of sugars. On the other hand, when no water was added, sugars acted as fillers, especially sucrose, which reinforced the blends as denoted by lower loss tangents and higher viscoelastic moduli. In this case, a microporous structure is formed after water immersion, observing smaller pore sizes in the positions previously taken by those sugars. The present manuscript highlights the importance of the procedure followed when introducing sugars in the formulation on the eventual properties of the bioplastics.

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Types of Biodegradable Polymers

Cited by 25 publications

References 72 publications

Effects of Mould Temperature on Rice Bran-Based Bioplastics Obtained by Injection Moulding

Effects of Mould Temperature on Rice Bran-Based Bioplastics Obtained by Injection Moulding

Development of Bio-Based and Biodegradable Plastics

Evaluation of Composition on Processability and Water Absorption of Wheat Gluten-Based Bioplastics

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