Effect of clay organomodifiers on degradation of polyhydroxyalkanoates

Bordes, Perrine; Hablot, Elodie; Pollet, Éric; Avérous, Luc

doi:10.1016/j.polymdegradstab.2009.01.027

Cited by 107 publications

(88 citation statements)

References 21 publications

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“…It was proposed that the surfactant starts to decompose according to the Hofmann elimination reaction or a nucleophilic attack of the ammonium counter-ion on the ammonium. The decomposition products, amines or acidic protons, could then enhance the random chain scission reaction of PHBV 16 .…”

Section: Resultsmentioning

confidence: 99%

Morphology and thermal properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/attapulgite nanocomposites

2011

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Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) -PHBV is a biodegradable polyester which has been studied as an option for the production of disposable goods. Attapulgite is a fibrous clay mineral. The aim of this work was to produce and characterize renewable resource derived-nanocomposites based on PHBV and organophilic attapulgite (MAT). The nanocomposites were characterized by XRD, SEM and thermal analysis. It was observed reduction in degree of crystallinity, in melting and glass transition temperatures and in thermal stability of polymer due to the addition of clay to PHBV matrix. The best results were obtained for PHBV films containing 3 and 5% MAT. These films presented a slight increase in processing window and decrease in crystalline temperature and in degree of crystallinity as compared to pure PHBV.

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Section: Resultsmentioning

confidence: 99%

Morphology and thermal properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/attapulgite nanocomposites

2011

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“…Although the incorporation of nanoclay could be interesting in order to improve the properties of PHB and blends, their effect on the processing, degradation and, as such, final molecular weight has to be taken into account. As reported in [69], the thermal-and thermo-mechanical degradation of the PHB and PHBV, in the presence of ammonium surfactants, commonly used as clay organo-modifiers. TGA degradation data of PHBV demonstrated that all surfactants have an effect on the polymer degradation and that this effect was more pronounced when the initial molecular weight of the polymer was low; indicating that the degradation mechanisms of both PHBV and the surfactant in the blend are interdependent and that the influence depends on the specific surfactant.…”

Section: Processing Techniques and Conditionsmentioning

confidence: 96%

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Bugnicourt¹,

Cinelli²,

Lazzeri³

et al. 2014

Express Polym. Lett.

768

463

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Abstract. Polyhydroxyalkanoates (PHAs) are gaining increasing attention in the biodegradable polymer market due to their promising properties such as high biodegradability in different environments, not just in composting plants, and processing versatility. Indeed among biopolymers, these biogenic polyesters represent a potential sustainable replacement for fossil fuel-based thermoplastics. Most commercially available PHAs are obtained with pure microbial cultures grown on renewable feedstocks (i.e. glucose) under sterile conditions but recent research studies focus on the use of wastes as growth media. PHA can be extracted from the bacteria cell and then formulated and processed by extrusion for production of rigid and flexible plastic suitable not just for the most assessed medical applications but also considered for applications including packaging, moulded goods, paper coatings, non-woven fabrics, adhesives, films and performance additives. The present paper reviews the different classes of PHAs, their main properties, processing aspects, commercially available ones, as well as limitations and related improvements being researched, with specific focus on potential applications of PHAs in packaging.

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“…Results suggest that the addition of OMMT further decreased the thermal stability of PLA during mixing. The thermal decomposition products of the surfactant in organomodified clay act as catalyst, which significantly decreases the thermal stability of polyesters at high temperatures [60,70].…”

Section: Acronymmentioning

confidence: 99%