Effect of blending conditions on mechanical, thermal, and rheological properties of plasticized poly(lactic acid)/maleated thermoplastic starch blends

Wootthikanokkhan, Jatuphorn; Wongta, N.; Sombatsompop, Narongrit; Kositchaiyong, Apisit; Wong-On, J.; Ayutthaya, Siriorn Isarankura Na; Kaabbuathong, Narin

doi:10.1002/app.35142

Cited by 38 publications

(42 citation statements)

References 14 publications

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“…5c), and the peak attributed to the glass transition of the starch-rich phase was not observed. Wootthikanokkhan et al [29] also did not observe the peak related to starch in PLA/Maleated TPS blends when the concentration of starch was 30 %.…”

Section: X-ray Diffractionmentioning

confidence: 91%

Adipate and Citrate Esters as Plasticizers for Poly(Lactic Acid)/Thermoplastic Starch Sheets

et al. 2014

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Poly(lactic acid) (PLA) and thermoplastic starch (TPS) sheets plasticized with different adipate and citrate esters were produced by a calendering-extrusion process. The incorporation of plasticizers significantly reduced the glass transition temperature and increased the PLA chain mobility thus improving the mechanical properties. Among the plasticizers employed, diethyl adipate significantly increased the elongation of the sheets and slightly increased the water vapor permeability. Micrographs revealed the incompatibility between starch and PLA, and there was no plasticizer phase separation, suggesting that the plasticizer concentration was adequate. The incorporation of adipate or citrate esters improves the mechanical properties and processability of PLA/TPS sheets produced by calendering extrusion at a pilot scale.

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Section: X-ray Diffractionmentioning

confidence: 91%

Adipate and Citrate Esters as Plasticizers for Poly(Lactic Acid)/Thermoplastic Starch Sheets

et al. 2014

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“…MTPS was prepared by mixing the cassava starch with glycerol and MA in an internal mixer. More detail concerning the preparation of MTPS can be found elsewhere 17…”

Section: Methodsmentioning

confidence: 99%

Preparation of modified starch‐grafted poly(lactic acid) and a study on compatibilizing efficacy of the copolymers in poly(lactic acid)/thermoplastic starch blends

Wootthikanokkhan

Kasemwananimit

Sombatsompop

et al. 2012

J of Applied Polymer Sci

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This study has concerned preparation of polylactic acid grafted with maleated thermoplastic starch (PLA-g-MTPS) and a study on compatibilizing efficacy of the above copolymers in PLA/thermoplastic starch (TPS) blends. The PLA-g-MTPS copolymers were prepared by two-step reaction. First, maleated thermoplastic starch (MTPS) was prepared by reacting cassava starch with glycerol and maleic anhydride (MA). Second, the MTPS was grafted onto PLA molecules using peroxide as an initiator. Chemical structures of the products were characterized by using Fourier transform infrared spectroscopy and 1 H-NMR techniques, whereas the acid numbers of the copolymers were determined by titration. Thermal characteristic of the copolymer was also characterized by using dynamic mechanical thermal analysis. In total, 5 wt % of the graft copolymer was blended with PLA and TPS in a twin screw extruder. Mechanical, rheological, and morpho-logical properties of the blends were evaluated via tensile test, melt flow index test, and scanning electron microscopy, respectively. It was found that mechanical properties of the blends depended on starch content and type of the PLA-g-MTPS. When the PLA-g-MTPS was prepared at low amount (0.25 pph) of peroxide, the mechanical properties of the blend was improved remarkably as compared to those of the normal blend and/or the blend containing different compatibilizers. Compatibilizing efficacy of the above copolymers became more obvious when the thermoplastic starch (TPS) blending ratio was increased. The above results were ascribed in the light of change in the viscosity and morphology of the blends. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E388-E395, 2012

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“…Unfortunately, the low crystallinity and poor heat resistance of the PLA limit its application . Many efforts have been made to improve the heat resistance of PLA, such as blending, nucleating agents, crosslinking, and nanoparticles …”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] Unfortunately, the low crystallinity and poor heat resistance of the PLA limit its application. [7][8][9] Many efforts have been made to improve the heat resistance of PLA, such as blending, 10 nucleating agents, [11][12][13][14][15] crosslinking, 16 and nanoparticles. 17 This structure can also have an effect on the heat resistance of PLA, for example, the preparation of stereocomplex (SC) PLA.…”

mentioning

confidence: 99%

Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

Xie

Wang

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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The miktoarm star‐shaped poly(lactic acid) (PLA) copolymer, (PLLA)2‐core‐(PDLA)2, was synthesized via stepwise ring‐opening polymerization of lactide with dibromoneopentyl glycol as the starting material. 1H NMR and FTIR spectroscopy proved the feasibility of synthetic route and the successful preparation of star‐shaped PLA copolymers. The results of FTIR spectroscopy and XRD showed that the stereocomplex structure of the copolymer could be more perfect after solvent dissolution treatment. Effect of chain architectures on crystallization was investigated by studying the nonisothermal and isothermal crystallization of the miktoarm star‐shaped PLA copolymer and other stereocomplexes. Nonisothermal differential scanning calorimetry and polarizing optical microscopy tests indicated that (PLLA)2‐core‐(PDLA)2 exhibited the fastest formation of a stereocomplex in a dynamic test due to its special structure. In isothermal crystallization tests, the copolymer exhibited the fast crystal growth rate and the most perfect crystal morphology. The results reveal that the unique molecular structure has an important influence on the crystallization of the miktoarm star‐shaped PLA copolymer. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 814–826

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Effect of blending conditions on mechanical, thermal, and rheological properties of plasticized poly(lactic acid)/maleated thermoplastic starch blends

Cited by 38 publications

References 14 publications

Adipate and Citrate Esters as Plasticizers for Poly(Lactic Acid)/Thermoplastic Starch Sheets

Adipate and Citrate Esters as Plasticizers for Poly(Lactic Acid)/Thermoplastic Starch Sheets

Preparation of modified starch‐grafted poly(lactic acid) and a study on compatibilizing efficacy of the copolymers in poly(lactic acid)/thermoplastic starch blends

Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

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