Thermal and Mechanical Properties of Thermoplastic Starch and Poly(Vinyl Alcohol-Co-Ethylene) Blends

• Published in: Journal of renewable materials Vol. 7; no. 3; pp. 245 - 252
• Main Authors: Alves, Ana Clara Lancarovici, Grande, Rafael, Carvalho, Antonio José Felix
• Format: Journal Article
• Language: English
• Published: Henderson Tech Science Press 01.01.2019
• Subjects: Absorption; Biodegradability; Biodegradation; Calorimetry; Copolymers; Differential scanning calorimetry; Ethylene; Evoh; Extrusion; Materials substitution; Mechanical properties; Mechanical Properties Of Polymers; Miscibility; Moisture; Moisture absorption; Morphology; Polymer Blends; Scanning electron microscopy; Starch; Tensile strength; Thermal Properties Of Polymers; Thermal stability; Thermodynamic properties; Thermogravimetric analysis; Thermoplastic resins; Thermoplastic Starch
• ISSN: 2164-6325; 2164-6341; 2164-6341
• DOI: 10.32604/jrm.2019.00833

The interest in thermoplastic starch (TPS) as a substitute material to replace conventional thermoplastics continues especially due its biodegradability, availability, low cost and because it is obtained from renewable sources. However, its poor mechanical properties and its high sensitivity to humidity have limited its use in several applications. Here, the copolymer poly (ethylene-co-vinyl alcohol) (EVOH), with two different ethylene contents, 27 and 44 mol% were blended with TPS by extrusion in order to overcome these limitations. The obtained blends were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), mechanical tensile testing, Scanning Electron Microscopy (SEM) and moisture absorption test. The addition of EVOH copolymer did not significantly changed the thermal stability of TPS, however it increased the tensile strength in 65% when compared to TPS. The morphology of the blends did not showed two distinct phases, an indication of miscibility or partial miscibility of the components. A decrease of moisture absorption was obtained by the addition of EVOH and is more pronounced for the EVOH with 44% of ethylene.