Properties of extruded starch-based plastic foam

Starch Protective Loose-Fill Foams

“…Extrusion process parameters, such temperature, screw speed, feed rate and moisture have direct influence on density, expansion ratio and other physical properties of extruded foams. Extrusion temperature depends on processed blend composition and ranged from 100°C to 180°C (Bhatnagar & Hanna, 1995;Cha et al, 2001;Shogren et al, 2002).…”

“…This differs from patents that claim hydroxypropylated high amylose foams as having a closed-cell structure, but the method used to make this assessment was not disclosed. Bhatnagar and Hanna (1995) tested commercial polystyrene (PS) loose-fills, commercial starch-based loose-fills and starch-based plastic loose-fills with addition of polystyrene and poly(methyl methacrylate) (PMMA). Tests showed that the PS loose-fills and the starchbased loose-fills had uniform cell size.…”

“…Several patents on the extruded foams based on starch and blends of starch with various additives have been filed (Bastioli et al, 1998a(Bastioli et al, , 1998bBellotti et al, 2000;Xu & Doane, 1998) and the material is commercially available. Considerable effort has been made to study the influence of extrusion conditions, moisture content and composition on the physical properties of starch-based foams (Bhatnagar & Hanna, 1995;Tatarka & Cunningham, 1998).…”

Physico-chemical and Mechanical Properties of Cornstarch-poly(Lactic Acid) Extrudates as Affected by Ceric Ammonium Nitrate

“…The bulk densities of the extrudates with 0.25% CAN, however, were still higher than that of commercial polystyrene foam (8.9 kg m 3 ). 1) In this study, we used talc as a nucleate agent. If the talc could be replaced with a gas, bulk density of the extrudate would be further decreased.…”

“…Their physical properties and water resistance, however, are inferior to those of petrochemical ones. 1) For the improvement of these properties, blending petrochemical materials with starch has been done. Anxiety, however, still remains because the fractions of petro chemical materials are not degradable.…”