Biodegradable Poly(lactic acid) Blends with Chemically Modified Polyhydroxyoctanoate Through Chain Extension

Lee, Jinkoo; McCarthy, Stephen P.

doi:10.1007/s10924-009-0144-9

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…One strategy involves mixing PLA with traditional synthetic polymers or with other biodegradable polymers. At present, PLA has been mixed with many kinds of polymers with very distinct features, biodegradable or nonbiodegradable, amorphous or semicrystalline, such as poly(ethylene glycol) (PEG) [2], poly(ethylene-co-vinyl acetate) (EVA) [1,5], poly(hydroxy ester ether) (PHEE) [6], starch [7], poly(vinyl alcohol) (PVA) [8], poly(butylene terephthalate) (PBT) [9], poly(β-hydroxybutyrate) (PHB) [10] and chemically modified polyhydroxyoctanoate (mPHO) [11]. Poly(3-hydroxyalkanoates) (PHAs) are microbially derived and renewable biodegradable polymers [12].…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal Cold Crystallization Kinetics of Poly(lactic acid)/Bacterial Poly(hydroxyoctanoate) (PHO)/Talc

2019

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The effects of bacterial poly(hydroxyoctanoate) (PHO) and talc on the nonisothermal cold crystallization behaviours of poly(lactic acid) (PLA) were analysed with differential scanning calorimetry (DSC), and the thermal stability of the samples was observed with thermal gravimetric analysis (TGA). The modified Avrami’s model was used to describe the nonisothermal cold crystallization kinetics of neat PLA and its blends. The activation energies E for nonisothermal cold crystallization were calculated by the isoconversional method of Kissinger-Akahira-Sunose (KAS). The DSC results showed that the PLA/PHO blends were immiscible in the whole studied range, and as the PHO and talc content increased, the crystallization rate of PLA accelerated, and the crystallinity of PLA in the PLA samples increased. The values of the Avrami exponent indicated that the nonisothermal cold crystallization of the neat PLA and its blends exhibited heterogeneous, three-dimensional spherulitic growth. The E values were strongly dependent on PHO and talc. The TGA results showed that the presence of PHO and talc slightly influenced the thermal stability of PLA.

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Section: Introductionmentioning

confidence: 99%

Nonisothermal Cold Crystallization Kinetics of Poly(lactic acid)/Bacterial Poly(hydroxyoctanoate) (PHO)/Talc

2019

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“…Therefore, blending PLA with such synthetic biodegradable polymers could provide one way of achieving adequate ductility and processability without compromising biodegradability. Along these lines, Lee and McCarthy2 prepared blends of PLA with chemically modified polyhydroxyoctanoate (mPHO) by direct melt mixing. To improve the compatibility of PLA and PHO, they used hexamethylene diisocyanate as a chain extender for PHO.…”

Section: Introductionmentioning

confidence: 99%

Elongational rheology of biodegradable poly(lactic acid)/poly[(butylene succinate)‐co‐adipate] binary blends and poly(lactic acid)/poly[(butylene succinate)‐co‐adipate]/clay ternary nanocomposites

Eslami

Kamal

2012

J of Applied Polymer Sci

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A series of blends based on poly(lactic acid) (PLA) and poly[(butylene succinate)-co-adipate] (PBSA) as well as their nanocomposites with nanoclay (PLA/PBSA/Clay ternary nanocomposites) were prepared using the twin-screw extruder. The blends were prepared for PBSA contents ranging from 25 to 75 wt % and their corresponding nanocomposites were prepared at a single-clay concentration. The morphology and structure of the blends and the nanocomposites were examined using field emission scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Rheological properties (dynamic oscillatory shear measurements and elongational viscosities) of the blends, nanocomposites, and pure components were studied in detail. The strain hardening intensity of different blends and nanocomposites was compared with the behavior of the pure components. Strong strain hardening behavior was observed for blends composed of 50 wt % and higher PBSA content. However, the effect of PBSA content on the elongational viscosity was less pronounced in PLA/PBSA/Clay ternary nanocomposites.

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“…When exposed to air at room temperature for 40 days, the unsaturated copolyester formed a highly flexible and biocompatible elastomer [45]. The double bonds of the unsaturated PHAs can be homo-/copolymerized via free radical mechanisms to graft poly(methyl methacrylate) or by UV irradiating to graft PEG in the presence of benzoyl peroxide [46] and benzoyl peroxide [24], respectively. The halogenated PHU could be transformed to macro reversible addition-fragmentation chain transfer agents via the substitution reaction with potassium ethyl xanthate, which further initiated polymerization of N-isopropylacryl amide to obtain thermo-responsive and amphiphilic brush copolymers [47,48].…”

Section: Phas With Unsaturated Side Chains and Their Derivativesmentioning

confidence: 99%

“…Several inherent deficiencies of PHB have limited its medical applications, including the brittleness due to the high crystallinity and the narrow thermal processing window because of the thermal instability. PHA copolyesters containing, besides 3-hydroxybutyrate (3HB, Figure 1a), 4-hydroxybutyrate (4HB, Figure 1b) [9][10][11] Figure 1d) [17][18], hydroxypropionate (HP, Figure 1e) [19][20], hydroxyhexanoate (HHx, Figure 1f) [21][22][23], and hydroxyoctanoate (HO, Figure 1g) [24] units can be produced by different microorganisms. Varying the copolymer composition affords obtaining copolyesters with adjustable mechanical and processing properties exceeding those of the P3HB homopolymer.…”

Section: Introductionmentioning

confidence: 99%

Synthetic routes to degradable copolymers deriving from the biosynthesized polyhydroxyalkanoates: A mini review

Ke¹,

Zhang²,

Ramakrishna³

et al. 2016

Express Polym. Lett.

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Abstract.Polyhydroxyalkanoates are a family of natural polyesters being produced as intracellular carbon and energy reserves by a wide variety of microorganisms. They have developed rapidly in both research and development efforts globally in the last 15 years. Till now, over 100 different types of PHAs have been successfully biosynthesized using both genetic engineering and fermentation techniques. Their unique biodegradable, biocompatible and thermoplastic characteristics make PHAs promising candidates for the commodity and biomedical applications. This review focused on the chemical synthesis of the derivatives of the biosynthesized PHAs.

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Biodegradable Poly(lactic acid) Blends with Chemically Modified Polyhydroxyoctanoate Through Chain Extension

Cited by 16 publications

References 26 publications

Nonisothermal Cold Crystallization Kinetics of Poly(lactic acid)/Bacterial Poly(hydroxyoctanoate) (PHO)/Talc

Nonisothermal Cold Crystallization Kinetics of Poly(lactic acid)/Bacterial Poly(hydroxyoctanoate) (PHO)/Talc

Elongational rheology of biodegradable poly(lactic acid)/poly[(butylene succinate)‐co‐adipate] binary blends and poly(lactic acid)/poly[(butylene succinate)‐co‐adipate]/clay ternary nanocomposites

Synthetic routes to degradable copolymers deriving from the biosynthesized polyhydroxyalkanoates: A mini review

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