Influence of Carboxylic Acids on Poly(lactic acid)/Thermoplastic Starch Biodegradable Sheets Produced by Calendering-Extrusion

2016 ◽  
Vol 37 (2) ◽  
pp. 332-338 ◽  
Author(s):  
Marianne Ayumi Shirai ◽  
Juliano Zanela ◽  
Marcos Hiroiuqui Kunita ◽  
Guilherme Miranda Pereira ◽  
Adley Forti Rubira ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Carboxylic Acids ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid

scholarly journals Mechanical Properties of Starch and Poly(lactic acid) Biodegradable Sheets Added of Carboxylic Acids

2014 ◽  
Vol 5 (2) ◽  
pp. 26
Author(s):  
Marianne Ayumi Shirai ◽  
Juliano Zanela ◽  
Fabio Yamashita
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Citric Acid ◽  
Relative Humidity ◽  
Carboxylic Acids ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid ◽  
Elongation At Break ◽  
Biodegradable Packaging ◽  
Hydrophobic Nature

<p><em>Thermoplastic starch and poly(lactic acid) (PLA) blends have been studied as potential materials for the production of biodegradable packaging. However due to the hydrophilic characteristic of starch and hydrophobic nature of PLA, these polymers are incompatible at microscopic level and this fact interfere significantly in the mechanical properties of the obtained materials. Several compatibilizer have been investigated to improve the compatibility between these polymers, including carboxylic acids. Thus, this study evaluated the mechanical properties of thermoplastic starch and PLA sheets added of citric and adipic acids produced by flat extrusion (calendaring-extrusion) and stored at different relative humidity. The sheets containing citric acid were thinner, more resistant and showed higher values of elongation at break. The relative humidity of storage interfered significantly in the mechanical properties, possibly due to the plasticizing effect of water. Citric acid was an additive which improved the mechanical properties of the starch and PLA sheets produced by flat extrusion. Furthermore, it is important to control the relative humidity of storage to not alter the mechanical properties of the starch based blends.</em></p><p>DOI: 10.14685/rebrapa.v5i2.164</p><p><em><br /></em></p>

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

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.

Biological Oxidative Mechanisms for Degradation of Poly(lactic acid) Blended with Thermoplastic Starch

2015 ◽  
Vol 3 (11) ◽  
pp. 2756-2766 ◽  
Author(s):  
Carlos A. Rodrigues ◽  
Aryane Tofanello ◽  
Iseli L. Nantes ◽  
Derval S. Rosa
Keyword(s):  
Lactic Acid ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid

Enhancing compatibility between poly(lactic acid) and thermoplastic starch using admicellar polymerization

2016 ◽  
Vol 133 (31) ◽  
Author(s):  
Kasinee Hemvichian ◽  
Phiriyatorn Suwanmala ◽  
Wararat Kangsumrith ◽  
Prapanee Sudcha ◽  
Kamonnit Inchoto ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid ◽  
Admicellar Polymerization

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

2014 ◽  
Vol 23 (1) ◽  
pp. 54-61 ◽  
Author(s):  
Marianne Ayumi Shirai ◽  
Carmen Maria Olivera Müller ◽  
Maria Victória Eiras Grossmann ◽  
Fabio Yamashita
Keyword(s):  
Lactic Acid ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid

Properties and Biodegradation of Thermoplastic Starch Obtained from Grafted Starches with Poly(lactic acid)

2019 ◽  
Vol 27 (11) ◽  
pp. 2607-2617 ◽  
Author(s):  
Z. B. Cuevas-Carballo ◽  
S. Duarte-Aranda ◽  
G. Canché-Escamilla
Keyword(s):  
Lactic Acid ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid
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