The properties of materials made from the composite of potato starch and ethylene-co-acrylic acid with polyethylene

The properties of materials made from the composite of potato starch and ethylene-co-acrylic acid with polyethylene or glycerine added in different amounts were studied. As it has been found, the increasing proportion of easily degradable starch composite increased its solubility in water, methanol and chloroform. Besides, water absorption and resistance to break also increased, but elongation at break and flow coefficient were reduced. The decreasing proportion of polyethylene reduced suitability of the material for commercial use, but in the majority of samples, the reduction was not linear. When polyethylene addition was reduced to 40-50%, the properties of the material obtained were still acceptable. Les proprietes des materiaux composes des melanges d'amidon de pomme de terre, de copolymere d'ethylene et d'acide acrylique, et de polyethylene ou de glycerine ajoutee en quantite variable ont ete etudiees. Quand la proportion d'amidon augmente, la solubilite du materiau dans l'eau, le methanol ou le chloroforme augmente, l'absorption d'eau, la resistance mecanique augmentent egalement, mais l'elongation a la dechirure diminue. Quand le polyethylene est reduit de 40 a 50%, les proprietes du materiau sont toujours acceptables.