4.2 Article

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

Journal

JOURNAL OF RENEWABLE MATERIALS
Volume 7, Issue 3, Pages 245-252

Publisher

TECH SCIENCE PRESS
DOI: 10.32604/jrm.2019.00833

Keywords

Thermoplastic starch; EVOH; polymer blends; thermal properties of polymers; mechanical properties of polymers

Funding

  1. National Counsel of Technological and Scientific Development (CNPq) [476709/2013-0, 307124/2015-0]
  2. Sao Paulo Research Foundation (FAPESP) [2015/07744-0]
  3. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]

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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.

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