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

Thiré, Rossana Mara da Silva Moreira; Arruda, Liliane Cardoso; Barreto, Ledjane Silva

doi:10.1590/s1516-14392011005000046

Cited by 74 publications

(33 citation statements)

References 16 publications

(25 reference statements)

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“…This small increase on the thermal stability occurred despite cork presented the lowest Tonset (246.3°C) as compared with the used polyester matrices (see Table 3). Some recent studies evidenced that the addition of nano-clay and natural fibres reduced or maintain, respectively, the thermal stability of PHBV [33,34]. However in the present study cork promoted a slight increase in 5.5% of the initial degradation temperature.…”

Section: Thermogravimetric Analysis (Tga)contrasting

confidence: 74%

Cork–polymer biocomposites: Mechanical, structural and thermal properties

et al. 2015

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a b s t r a c tThis work addresses to the preparation of biocomposites resulting from the combination of different biodegradable aliphatic polyesters with cork (30 wt.%). The lignocellulosic biomass with closed cellular structure was compounded with poly(L-lactic acid) (PLLA), polyhydroxybutyrate-co-hydroxyvalerate (PHBV), poly-e-caprolactone (PCL) and starch-poly-e-caprolactone (SPCL) blend using a twin-screw extruder prior to injection moulding into tensile samples. The physico-mechanical and thermal properties of the matrices and the bio-based cork composites were investigated. This study shows that the addition of cork contributes to produce lightweight materials using PLLA and PHBV matrices and promotes an increase on the stiffness of PCL. The fracture morphology observations showed good physical cork-matrix bonding with absence of voids or cavities between cork and the bio-based polyesters. Cork increases the crystallinity degree of the biocomposites. These findings suggest that the cork-polymer biocomposites are a viable alternative to develop more sustainable composite materials, such as automotive interior parts and bio-based caps for wine bottles as it has been shown as proof-of-concept.

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Section: Thermogravimetric Analysis (Tga)contrasting

confidence: 74%

Cork–polymer biocomposites: Mechanical, structural and thermal properties

et al. 2015

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“…60,61 These two peaks were used to estimate the average size of the crystalline domains responsible for coherent scattering perpendicularly to each crystallographic plane. The values obtained by Scherrer's equation 43 are reported in Table 1 along with the degrees of crystallinity assessed by fitting WAXD patterns (X C WAXD ).…”

Section: Articlementioning

confidence: 99%

From a Three-Phase Model to a Continuous Description of Molecular Mobility in Semicrystalline Poly(hydroxybutyrate-co-hydroxyvalerate)

et al. 2016

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In most cases, a three-phase model consisting of crystalline domains surrounded by rigid amorphous areas dispersed in the mobile amorphous phase is required and eventually sufficient to accurately describe the microstructure of semicrystalline polymers. This work shows that the microstructure developed by poly(hydroxybutyrate-co-hydroxyvalerate) by cold crystallization is better described by a complex two-phase model in which the boundaries of the crystalline domains and the surrounding amorphous environment form a “continuum of mobility”. This concept can be extended to a wide range of semicrystalline polymers. When the crystalline and the amorphous phases are strongly coupled, the rigid and mobile amorphous fractions are hardly fractionated, and the whole noncrystalline phase should be rather depicted as continuum with a broad distribution of the relaxation times associated with the glass transition. Such a depiction of the amorphous phase allows taking into account any modification of the mobility landscape with time, which can be evidenced as the progressive spreading of the relaxation functions. From a practical point of view, the rigidification of the “continuum of mobility” upon storage in conditions of cold crystallization could be considered as a cause of the progressive embrittlement sometimes observed in semicrystalline materials during physical aging and would be explained by a redistribution of the relaxation times translated in terms of relaxation temperatures

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“…From the analysis of DSC was obtained the melting temperature (Tm) of the composites. The degree of crystallinity (Xc) of the PHB composites was estimated using the enthalpy of fusion of the sample, as reported in Thiré et al 27 . Scanning electron microscopy (SEM) with secondary electron (SE) detector, operated at 20 kV accelerating voltage, was used to visualize the fractured surfaces of the neat PHB and composites after the tensile text.…”

Section: Composite Characterizationmentioning

confidence: 99%

Particles of Coffee Wastes as Reinforcement in Polyhydroxybutyrate (PHB) Based Composites

et al. 2015

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The objective of the present study was to evaluate lignocellulosic particles from sub-products of the coffee industry (coffee parchment -CP and husk -CH) into polyhydroxybutyrate (PHB) as a promising reinforcing filler in the biocomposites. The effects of type (CP or CH) and content (neat, 10% and 20%) of coffee wastes on the thermal, mechanical, microstructural and physical properties of the ensuing composites were evaluated. Thermal stability of the composites was improved by the coffee residues at different contents, while degree of crystallinity was decreased with the inclusion of CP. The addition of 10% of CP has not influenced significantly the tensile strength (TS) and Izod strength (IS), in relation to the neat PHB. Tensile strength (TS), MOE and Izod strength (IS) of the composites have increased significantly with the inclusion of 20% of CP. The increase in the content of coffee waste particles increased the water absorption of the composites.

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

Cited by 74 publications

References 16 publications

Cork–polymer biocomposites: Mechanical, structural and thermal properties

Cork–polymer biocomposites: Mechanical, structural and thermal properties

From a Three-Phase Model to a Continuous Description of Molecular Mobility in Semicrystalline Poly(hydroxybutyrate-co-hydroxyvalerate)

Particles of Coffee Wastes as Reinforcement in Polyhydroxybutyrate (PHB) Based Composites

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