Abstract
AbstractStarch processed by injection molding is a good candidate to substitute inorganic polymers because of its renewable and environmental friendly characteristics. However, starch usable products show an ageing process that affects structural and mechanical properties. In this work mechanical and structural properties of extruded‐injection molded samples of corn starch prepared with 25% moisture content were characterized in “as molded”, and after ageing conditions. The microstructure and morphology of the samples were analyzed using X‐ray diffraction (XRD) and scanning electronic microscopy (SEM). Standard indentation tests as well as creep ones were performed to obtain the static elastic modulus, creep rate and hardness of the samples. Results showed that after the period of ageing the CR of the materials increased due to a crystalline reordering in the aged material. Moreover, elastic modulus and creep behavior showed a close correlation to the ageing process in the molded starch sample leading to a material with homogeneous elastic properties with the penetration depth. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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