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

This research aims to determine the influences of radiation-induced crosslinking on the mechanical properties of polymer blends between poly (lactic acid) (PLA) and thermoplastic starch (TPS). PLA and TPS were mixed at different ratios (90:10, 80:20, 70:30, 60:40) in the presence of a crosslinking agent using a twin screw extruder. The blends were compression molded into films. The film samples were irradiated by gamma radiation at different doses. Gel fraction was used to determine crosslinking efficiency. Results showed that gamma radiation was able to induce crosslinking for PLA/TPS blends. The gel fraction and mechanical properties decreased with increasing TPS content. The optimum ratio of PLA:TPS with the maximum gel fraction and mechanical properties was 90:10 and the optimum dose was 40 kGy by gamma radiation.

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Mechanical, Morphological and Thermal Characterization of Compatibilized Poly(lactic acid)/Thermoplastic Starch Blends

Acta Technica Jaurinensis ◽

10.14513/actatechjaur.v13.n1.532 ◽

2020 ◽

Vol 13 (1) ◽

pp. 1-13

Author(s):

László Lendvai ◽

Dávid Brenn

Keyword(s):

Lactic Acid ◽

Interfacial Adhesion ◽

Thermal Characterization ◽

Thermoplastic Starch ◽

Chain Extender ◽

Coupling Agents ◽

Poly Lactic Acid ◽

Binary Blends ◽

Starch Blends

A two-step compounding procedure was used to produce binary blends composed of poly(lactic acid) (PLA) and thermoplastic starch (TPS) with varying component ratios. Subsequently, three different chemical connectors were introduced in order to enhance the interfacial adhesion between the PLA and the TPS. Maleic anhydride, blocked isocyanate, and chain extender were used as coupling agents. Mechanical, morphological and thermal properties of PLA/TPS blends were determined. It was revealed that the initial interfacial adhesion between the components is weak. Out of the three coupling agents introduced, the chain extender proved to be the most effective, however, the improvement achieved in the mechanical properties was still marginal. According to the thermogravimetric analysis thermal stability was not significantly affected by any of the coupling agents.

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The impact of morphology on thermal properties and aerobic biodegradation of physically compatibilized poly (lactic acid)/co-plasticized thermoplastic starch blends

Polymers for Advanced Technologies ◽

10.1002/pat.4407 ◽

2018 ◽

Vol 29 (12) ◽

pp. 2880-2889 ◽

Cited By ~ 5

Author(s):

Mohsen Esmaeili ◽

Gholamreza Pircheraghi ◽

Reza Bagheri ◽

Volker Altstädt

Keyword(s):

Lactic Acid ◽

Thermal Properties ◽

Thermoplastic Starch ◽

Aerobic Biodegradation ◽

Poly Lactic Acid ◽

Starch Blends ◽

The Impact

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Studies on electrospun poly (lactic acid) fibers and low density poly (ethylene) / thermoplastic starch blends as food packaging materials

10.32657/10356/74018 ◽

2018 ◽

Author(s):

◽

Lakshmi Natarajan

Keyword(s):

Lactic Acid ◽

Food Packaging ◽

Thermoplastic Starch ◽

Poly Lactic Acid ◽

Packaging Materials ◽

Low Density ◽

Food Packaging Materials ◽

Starch Blends ◽

Poly Ethylene

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Mechanical, Thermal, and Morphological Properties of Thermoplastic Starch/Poly(lactic acid/Poly(butylene adipate-co-terephthalate) Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.970.312 ◽

2014 ◽

Vol 970 ◽

pp. 312-316

Author(s):

Sujaree Tachaphiboonsap ◽

Kasama Jarukumjorn

Keyword(s):

Lactic Acid ◽

Impact Strength ◽

Interfacial Adhesion ◽

Tensile Modulus ◽

Thermoplastic Starch ◽

Morphological Properties ◽

Poly Lactic Acid ◽

Melt Blending ◽

Elongation At Break ◽

Blending Method

Thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend and thermoplastic starch (TPS)/poly (lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend were prepared by melt blending method. PLA grafted with maleic anhydride (PLA-g-MA) was used as a compatibilizer to improve the compatibility of the blends. As TPS was incorporated into PLA, elongation at break was increased while tensile strength, tensile modulus, and impact strength were decreased. Tensile properties and impact properties of TPS/PLA blend were improved with adding PLA-g-MA indicating the enhancement of interfacial adhesion between PLA and TPS. With increasing PBAT content, elongation at break and impact strength of TPS/PLA blends were improved. The addition of TPS decreased glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) of PLA. Tgand Tcof TPS/PLA blend were decreased by incorporating PLA-g-MA. However, the presence of PBAT reduced Tcof TPS/PLA blend. Thermal properties of TPS/PLA/PBAT blends did not change with increasing PBAT content. SEM micrographs revealed that the compatibilized TPS/PLA blends exhibited finer morphology when compared to the uncompatibilized TPS/PLA blend.

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