Membranes en PHB, P(HB-co-9% HV), P(HB-co-22% HV) pour la microfiltration ou la pervaporation proprietes filtrantes et etat de surface

Mas, André; Jaaba, H.; Sledz, J.; Schué, François

doi:10.1016/0014-3057(96)80013-9

Cited by 14 publications

(7 citation statements)

References 10 publications

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“…Table III also shows that all previous water contact‐angle data12, 13, 33, 34 on PHB n HV are higher than our values and were obtained on solution‐cast samples, which is consistent with the trend described previously for PLA and PCL. The data in Table III also show that increasing the composition of HV in PHB n HV results in increasing the contact angle of water, an indication of increased hydrophobicity of the surface due to the increased concentration of HV segments on the surface.…”

Section: Resultssupporting

confidence: 92%

“…A literature search produced several reports of water contact angles on PLA,2, 7, 27–29 PCL,9, 11, 30–32 and PHBHV12, 13, 33, 34 of various hydroxyvalerate (HV) contents; one report each for the CH 2 I 2 contact angle on PLA7 and PCL11; and no contact‐angle reports for PHEE and Copolyester 14766. The reported contact‐angle values along with the quoted standard deviations are summarized and compared with the results from this work in Table III.…”

Section: Resultsmentioning

confidence: 99%

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Correlation between mechanical adhesion and interfacial properties of starch/biodegradable polyester blends

Biresaw

Carriere

2001

J Polym Sci B Polym Phys

102

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Biopolymers are preferred ingredients for the manufacture of materials because they are based on abundantly available and renewable raw materials that have benign environmental problems associated with their production, fabrication, use, and disposal; however, the wide use of biopolymers in engineering applications has not been achieved, mainly because of the inferior quality of many biopolymer‐based products. To overcome this limitation, studies have been initiated on blends of biopolymers and biodegradable synthetic polymers. We used the contact angle of probe liquids to measure the surface energy of polystyrene, the biodegradable polyesters polycaprolactone, poly(hydroxybutyrate‐co‐hydroxyvalerate), polylactic acid, polybutylene adipate terephthalate, and adipic poly(hydroxy ester ether), and normal starch. The surface energies were used to estimate the starch/polymer interfacial energy and work of adhesion. The calculated starch/polyester work of adhesion showed mixed correlation with published starch/polyester mechanical properties, indicating that factors other than interfacial properties might be dominant in determining the mechanical properties of some starch/polyester blends. © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 920–930, 2001

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Correlation between mechanical adhesion and interfacial properties of starch/biodegradable polyester blends

Biresaw

Carriere

2001

J Polym Sci B Polym Phys

102

View full text Add to dashboard Cite

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“…The enthalpy of fusion was obtained from the area of the endothermic peak as described in literature [17] . (Figure 3a) exhibits a rough structure with defects and voids, typical of cast prepared films, also observed in previous works [18,19] . In the lateral surface (Figure 3b) no pore were observed, characterizing the membranes as dense and validating the theoretical development used for determining membrane permeability.…”

Section: Resultssupporting

confidence: 61%

Water and vapor permeability at different temperatures of poly (3-Hydroxybutyrate) dense membranes

Poley¹,

Silva²,

Vargas³

et al. 2005

Polímeros

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Polyhydroxyalkanoates (PHAs) are polymers produced from renewable resources with biodegradability and biocompatibility, being therefore attractive for medical and pharmaceutical purposes. Poly (3-hydroxybutyrate) (PHB) is the most important polymer of this family by considering the biotechnology process of its synthesis. In the present study, dense films of PHB were prepared by casting from chloroform solutions (1% m/m). Permeability studies with water, methanol, ethanol and n-propanol were performed using the gravimetric method at different temperatures (from 50 °C to 65 °C). Results provide new data on permeability coefficients of PHB membranes.

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“…A rough surface with topographic highs and reliefs can be identified, which is similar to the morphology described in literature for membranes prepared by spin coating using scanning electron microscopy (SEM). 18,24 From Figure 6, it can also be observed that as hydroxyvalerate concentration increases, so does the size of depressions, and their number decrease. To analyze these differences in a quantitative way, the following roughness parameters of the images were calculated using the AFM software program:…”

Section: Figurementioning

confidence: 81%

“…This theme was contemplated in some works in the literature such as the study of water, carbon dioxide, and vapor permeation using gravimetric techniques, 15,16 effect of membrane preparation on its transport properties, 17 and synthesis of membranes for ultrafiltration. 18 The present work intends to offer new knowledge about short-chain polyhydroxyalkanoate dense membranes, studying its diffusion coefficients to oxygen and carbon dioxide and their thermal properties using photoacoustic techniques. The results are correlated with topographic AFM images and surface analysis data.…”

Section: Introductionmentioning

confidence: 99%

Photothermal methods and atomic force microscopy images applied to the study of poly(3‐hydroxybutyrate) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) dense membranes

Poley

Legey

Silva

et al. 2005

J of Applied Polymer Sci

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Thermal and transport properties of some polyhydroxyalkanoates (PHAs), poly-3-hydroxybutyrate and poly-3-hydroxybutyrate-co-3-hydroxyvalerate copolymers at different concentrations (8, 14, and 22%), were studied by using photoacoustic and photothermal techniques. Mass diffusion coefficients were obtained for carbon dioxide and oxygen by using a gas analyzer. Specific heat capacity measurements were performed by monitoring temperature of the samples under white light illumination against time. Thermal diffusivities were determined by using the open photoacoustic cell configuration. The results were discussed considering the incorporation of hydroxyvalerate units in the poly(3-hydroxybutyrate) unit cell and were correlated with atomic force microscopy images of the upper surface of membranes. New information on transport properties of PHAs is provided.

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Membranes en PHB, P(HB-co-9% HV), P(HB-co-22% HV) pour la microfiltration ou la pervaporation proprietes filtrantes et etat de surface

Cited by 14 publications

References 10 publications

Correlation between mechanical adhesion and interfacial properties of starch/biodegradable polyester blends

Correlation between mechanical adhesion and interfacial properties of starch/biodegradable polyester blends

Water and vapor permeability at different temperatures of poly (3-Hydroxybutyrate) dense membranes

Photothermal methods and atomic force microscopy images applied to the study of poly(3‐hydroxybutyrate) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) dense membranes

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