Morphology and molten-state rheology of polylactide and polyhydroxyalkanoate blends

Gérard, Thibaut; Budtova, Tatiana

doi:10.1016/j.eurpolymj.2012.03.015

Cited by 124 publications

(111 citation statements)

References 20 publications

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“…For example, Gerard and Budtova demonstrated that PHA and PLA are immiscible polymers, and nodular and co-continuous morphologies were observed. 29 From the rheology analysis, the thermal stability of PHBV was extremely low, and the PLA/PHBV blends served a significant role in improving this property. Although PLA and PHBV are brittle polymers, blends that contain a small amount of PHBV in a PLA matrix exhibited a significant ductile plastic deformation.…”

Section: Pha Modification Via Blendingmentioning

confidence: 99%

“…Although PLA and PHBV are brittle polymers, blends that contain a small amount of PHBV in a PLA matrix exhibited a significant ductile plastic deformation. 29 PHAs that consist of 3HB and a small amount of MCL-HA units have lower crystallinities and T m s and more ductile properties than short-chain-length PHAs. Noda et al 30 reported that blends of PLA with this type of PHA can form an excellent pair of complementary materials, which can effectively balance the shortcomings of these materials when combined.…”

Section: Pha Modification Via Blendingmentioning

confidence: 99%

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Polyhydroxyalkanoates: opening doors for a sustainable future

2016

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Polyhydroxyalkanoates (PHAs) comprise a group of natural biodegradable polyesters that are synthesized by microorganisms. However, several disadvantages limit their competition with traditional synthetic plastics or their application as ideal biomaterials. These disadvantages include their poor mechanical properties, high production cost, limited functionalities, incompatibility with conventional thermal processing techniques and susceptibility to thermal degradation. To circumvent these drawbacks, PHAs need to be modified to ensure improved performance in specific applications. In this review, well-established modification methods of PHAs are summarized and discussed. The improved properties of PHA that blends with natural raw materials or other biodegradable polymers, including starch, cellulose derivatives, lignin, poly(lactic acid), polycaprolactone and different PHA-type blends, are summarized. The functionalization of PHAs by chemical modification is described with respect to two important synthesis approaches: block copolymerization and graft copolymerization. The expanded utilization of the modified PHAs as engineering materials and the biomedical significance in different areas are also addressed.

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Section: Pha Modification Via Blendingmentioning

confidence: 99%

Section: Pha Modification Via Blendingmentioning

confidence: 99%

Polyhydroxyalkanoates: opening doors for a sustainable future

2016

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“…[19] PHAs containing over 90 types of monomers have been synthesized in various microorganisms. The characteristics of thermoplastic PHAs range from rigid plastics to tough elastomers and depend on their molecular structure.…”

Section: Introductionmentioning

confidence: 99%

Characterization and biodegradation behavior of bio-based poly(lactic acid) and soy protein blends for sustainable horticultural applications

et al. 2015

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Adipic anhydride-plasticized soy protein (SP.A) was blended with poly(lactic acid) (PLA) at two concentrations (50/50 and 33/67) and was evaluated for use as a sustainable replacement for petroleum plastic in horticulture crop containers. Following the discovery that SP.A/PLA blends provide additional functions above that of petroleum plastic for this application, the present study evaluates the biodegradation behavior of these materials in soil and describes the substantial improvements in sustainability that result from the additional functions (intrinsic fertilizer and root improvement of plants) and the end-of-life option of biodegradation. After being buried in soil for designated time intervals, the residual degraded samples were analyzed to determine morphological and thermal properties at sequential stages of biodegradation. Samples were characterized by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The results indicated that there was a compatible system between SP.A and PLA in the melt. Incorporation of SP.A accelerated the biodegradation rate of this binary blend significantly compared with pure PLA. Prior to the degradation process, both the glass transition temperatures and melting temperatures of the blends containing SP.A decreased as the concentration of the soy protein increased. With increasing degradation time of the blended samples in soil, the glass transition temperatures increased in the early stages of biodegradation then decreased, a trend associated with the decrease in the molecular weight of the blends as a result of biodegradation. In addition, the thermal stability of blends increased gradually with increasing degradation time, suggesting faster biodegradation loss of the soy component of the SP.A/PLA blends. These results support the use of soy-based polymer blends for horticulture crop containers and provide data for evaluating their use as sustainable materials for other potential applications. Disciplines ABSTRACTOne of the most significant limitations to widespread industrial implementation of emerging bioplastics such as poly(lactic acid) and poly(hydroxyalkanoate) (PHA) is that they do not match the flexibility and impact resistance of petroleum-based plastics like poly(propylene) or highdensity poly(ethylene). The basic goal of this research is to identify alternative, affordable, sustainable, biodegradable materials that can replace petroleum-based polymers in a wide range of industrial applications, with an emphasis on providing a solution for increasing the flexibility of PHA to a level that makes it a superior material for bioplastic nursery-crop containers. A series of bio-based PHA/poly(amide) (PA) blends with different concentrations were mechanically melt processed using a twin-screw extruder and evaluated for physical characteristics. The effects of blending on viscoelastic properties were investigated using smallamplitude oscillatory shear flow experimen...

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“…At very low HV content, PHBV is similar to conventional petrochemical thermoplastics, such as polypropylene, in terms of melting temperature, crystallinity, and tensile strength [11][12][13][14][15]. Most of literature agrees on immiscibility of PLA and PHBV [16][17][18][19]. Boufarguine et al [17] created multilayered films of PLA/PHBV (90/10 wt%) using multilayer co-extrusion.…”

mentioning

confidence: 99%

Polylactide/poly(hydroxybutyrate-co-hydroxyvalerate) blends: Morphology and mechanical properties

Gérard¹,

Budtova²,

Podshivalov³

et al. 2014

Express Polym. Lett.

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International audienceThe morphology and the mechanical properties of polylactide/poly(hydroxybutyrate-co-hydroxyvalerate) blends of various compositions were studied. The statistical analysis of the scanning electron microscopy images allowed finding two statistical ensembles of the minor-phase particles. The first ensemble involves the dispersed particles, whereas the second one contains the coalesced particles. The mean diameters of both dispersed and coalesced minor-phase particles were calculated and plotted against the blend composition. Young's modulus, tensile strength, elongation at break, and Charpy impact strength of the blends were determined and examined as a function of the blend composition. The Young's modulus values were shown to be in accordance with theoretical predictions

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Morphology and molten-state rheology of polylactide and polyhydroxyalkanoate blends

Cited by 124 publications

References 20 publications

Polyhydroxyalkanoates: opening doors for a sustainable future

Polyhydroxyalkanoates: opening doors for a sustainable future

Characterization and biodegradation behavior of bio-based poly(lactic acid) and soy protein blends for sustainable horticultural applications

Polylactide/poly(hydroxybutyrate-co-hydroxyvalerate) blends: Morphology and mechanical properties

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