Thermal and rheological properties of modified polyhydroxybutyrate (PHB)

Weinmann, Sandra; Bonten, Christian

doi:10.1002/pen.25075

Cited by 20 publications

(14 citation statements)

References 19 publications

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“…For confirmation, an isothermal dynamic time sweep test of PHBV is available in the supplementary information S3. PHBV is known to degrade quickly above its melting temperature 19 . The storage modulus ( G' ) of PHBV/PBSA blends was situated between the PHBV and PBSA values.…”

Section: Resultsmentioning

confidence: 99%

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Characterization of a new bio‐based and biodegradable blends of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) and poly(butylene‐co‐succinate‐co‐adipate)

Delliou

Vitrac

Castro

et al. 2022

J of Applied Polymer Sci

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Melt blending of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(butylene-co-succinate-co-adipate) (PBSA) was investigated by means of batch mixing at different weight ratios (100:0, 70:30, 50:50, 30:70, and 0:100).PHBV and PBSA were immiscible. PBSA formed small nodules in PHBV, while PHBV formed large inclusions in PBSA. In 50/50 wt% blends, a cocontinuous structure was obtained. The crystallization rate of PHBV and PBSA increased in the blends, most probably due to mutual nucleation, except at the later stages, where PHBV crystallization rates slowed down inside the nodules and in the co-continuous structure. The mechanical properties were successfully modeled with the EBM model, including parallel and serial resistances and show that the rigidity of the material can be modulated using PBSA. The elongation at break is however governed by PHBV. The blends featured brittle fracture even if PBSA was the continuous phase. The analysis of the stress at break showed that the fracture could be ascribed to debonding at the interfaces and the fracture behavior of PHBV.

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Section: Resultsmentioning

confidence: 99%

“…PHBV is known to degrade quickly above its melting temperature. 19 The storage modulus (G') of PHBV/PBSA blends was situated between the PHBV and PBSA values. It increased with rising PBSA content.…”

Section: Rheological Propertiesmentioning

confidence: 98%

Characterization of a new bio‐based and biodegradable blends of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) and poly(butylene‐co‐succinate‐co‐adipate)

Delliou

Vitrac

Castro

et al. 2022

J of Applied Polymer Sci

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“…A similar behavior was observed in the case of the temperature of the maximum decomposition rate (Td), which decreased by less than 10 °C for up to 15 wt% PHO and by around 26 °C at maximum PHO concentration (Table 1). This major degradation step may be ascribed to the random chain scission of PHB ester bonds by intramolecular cis-elimination, where degradation products like crotonic acid, linear oligomers with a crotonate end-group, and dimers and trimers of crotonic acid were formed [17,28]. A similar behavior was observed in the case of the temperature of the maximum decomposition rate (T d ), which decreased by less than 10 • C for up to 15 wt% PHO and by around 26 • C at maximum PHO concentration (Table 1).…”

Section: Thermal Stability Of Phb Blendsmentioning

confidence: 99%

Low Molecular Weight and Polymeric Modifiers as Toughening Agents in Poly(3-Hydroxybutyrate) Films

et al. 2020

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The inherent brittleness of poly(3-hydroxybutyrate) (PHB) prevents its use as a substitute of petroleum-based polymers. Low molecular weight plasticizers, such as tributyl 2-acetyl citrate (TAC), cannot properly solve this issue. Herein, PHB films were obtained using a biosynthesized poly(3-hydroxyoctanoate) (PHO) and a commercially available TAC as toughening agents. The use of TAC strongly decreased the PHB thermal stability up to 200 °C due to the loss of low boiling point plasticizer, while minor weight loss was noticed at this temperature for the PHB-PHO blend. Both agents shifted the glass transition temperature of PHB to a lower temperature, the effect being more pronounced for TAC. The elongation at break of PHB increased by 700% after PHO addition and by only 185% in the case of TAC; this demonstrates an important toughening effect of the polymeric modifier. Migration of TAC to the upper surface of the films and no sign of migration in the case of PHO were highlighted by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) results. In vitro biocompatibility tests showed that all the PHB films are non-toxic towards L929 cells and have no proinflammatory immune response. The use of PHO as a toughening agent in PHB represents an attractive solution to its brittleness in the case of packaging and biomedical applications while conserving its biodegradability and biocompatibility.

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“…Plasticizers are polymeric additives to improve flexibility, chemical permeability, and mechanical properties as tensile resistance (Weinmann & Bonten, 2019; Yu et al., 2017). Previous researches using glycerol as a plasticizer have revealed its efficiency to increase mechanical and permeability properties in the films (Dias et al., 2014; Dima et al., 2016; Ma et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of glutaraldehyde/glycerol ratios on the properties of chitosan films

Oliveira

Ugucioni

Borges

2020

J Food Process Preserv

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Chitosan is a biodegradable polymer and could be applied as packaging. To make chitosan more competitive, plasticizers and cross‐linking agents are added in films. The aim of this paper was to obtain and characterize films of chitosan without or with glutaraldehyde (0; 0.99 mg/150 ml) in different concentrations of glycerol (0, 10, 20, and 30%w/w), for improving the properties like tensile resistance and the water vapor permeability. The films were homogeneous, without phase separation, and with a similar chemical structure. The glutaraldehyde makes the chitosan partly hydrophobic, leading to glycerol saturation in samples with glutaraldehyde and 20 or 30% of glycerol. The Principal Component Analysis for the film with glutaraldehyde and 10% of glycerol presented 3.60 g.mm/kPa.day.m2 of water vapor permeability and 36.96 MPa of tensile resistance. The use of plasticizer and cross‐linking in combination is promising to make chitosan film more competitive on the market of packaging. Practical Applications The addition of glutaraldehyde and glycerol was efficient to improve film properties like water vapor permeability and mechanical properties. The chitosan films with glycerol and glutaraldehyde exhibited similar physical and chemical properties to non‐biodegradable polymers from the petrochemical origin and non‐renewable sources. Furthermore, chitosan films with these additives can be applied as packaging, improving the competitiveness of this biopolymer to the market. The technology described in the paper is important for application as secondary or tertiary packaging in the food industry.

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Thermal and rheological properties of modified polyhydroxybutyrate (PHB)

Cited by 20 publications

References 19 publications

Characterization of a new bio‐based and biodegradable blends of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) and poly(butylene‐co‐succinate‐co‐adipate)

Characterization of a new bio‐based and biodegradable blends of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) and poly(butylene‐co‐succinate‐co‐adipate)

Low Molecular Weight and Polymeric Modifiers as Toughening Agents in Poly(3-Hydroxybutyrate) Films

Effect of glutaraldehyde/glycerol ratios on the properties of chitosan films

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