Examination of injection moulded thermoplastic maize starch

This paper focuses on the effect of the different injection moulding parameters and storing methods on injection moulded thermoplastic maize starch (TPS). The glycerol and water plasticized starch was processed in a twin screw extruder and then with an injection moulding machine to produce TPS dumbbell specimens. Different injection moulding set-ups and storing conditions were used to analyse the effects on the properties of thermoplastic starch. Investigated parameters were injection moulding pressure, holding pressure, and for the storage: storage at 50% relative humidity, and under ambient conditions. After processing the mechanical and shrinkage properties of the manufactured TPS were deter- mined as a function of the ageing time. While conditioning, the characteristics of the TPS changed from a soft material to a rigid material. Although this main behaviour remained, the different injection moulding parameters changed the character- istics of TPS. Scanning electron microscope observations revealed the changes in the material on ageing.

[1]  Xiaofei Ma,et al.  High performance biodegradable thermoplastic starch—EMMT nanoplastics , 2005 .

[2]  S. Hulleman,et al.  Changes in the mechanical properties of thermoplastic potato starch in relation with changes in B-type crystallinity , 1996 .

[3]  R. Stepto.  The processing of starch as a thermoplastic , 2003 .

[4]  L. Averousa,et al.  Properties of thermoplastic blends : starch – polycaprolactone , 2000 .

[5]  M. C. Silva,et al.  Reactive processing and mechanical properties of cross-linked maize starch , 2006 .

[6]  H. Bader,et al.  Influence of natural fibres on the mechanical properties of biodegradable polymers. , 1998 .

[7]  Jiu-gao Yu,et al.  High mechanical performance MMT-urea and formamide-plasticized thermoplastic cornstarch biodegradable nanocomposites , 2006 .

[8]  I. Tomka.  Thermoplastic starch. , 1991, Advances in experimental medicine and biology.

[9]  L. Avérous,et al.  Poly(lactic acid): plasticization and properties of biodegradable multiphase systems , 2001 .

[10]  J. Kennedy,et al.  Studies on the properties of natural fibers-reinforced thermoplastic starch composites , 2005 .

[11]  M. Huneault,et al.  Morphology and properties of compatibilized polylactide/thermoplastic starch blends , 2007 .

[12]  L. Avérous,et al.  Starch-based biodegradable blends: morphology and interface properties , 2004 .

[13]  D. Bhattacharya,et al.  Engineering Biopolymers : Homopolymers , Blends , and Composites , 2007 .

[14]  L. Avérous,et al.  Biocomposites based on plasticized starch: thermal and mechanical behaviours , 2004 .

[15]  Edwin Bodros,et al.  Could biopolymers reinforced by randomly scattered flax fibre be used in structural applications , 2007 .

[16]  L. Avérous,et al.  Plasticized starch–cellulose interactions in polysaccharide composites , 2001 .

[17]  Maolin Zhai,et al.  Radiation modification of starch-based plastic sheets , 2003 .

[18]  Xiaofei Ma,et al.  Studies on the properties of Montmorillonite-reinforced thermoplastic starch composites , 2004 .

[19]  L. Avérous,et al.  Blends of thermoplastic starch and polyesteramide: Processing and properties , 2000 .

[20]  M. Q. Zhang.  Polymeric materials from natural resources - emerging as the times require , 2007 .

[21]  L. Avérous.  Biodegradable Multiphase Systems Based on Plasticized Starch: A Review , 2004 .

[22]  K. Réczey,et al.  Reducing water absorption in compostable starch-based plastics , 2005 .

[23]  Luc Avérous,et al.  Association between plasticized starch and polyesters: Processing and performances of injected biodegradable systems , 2001 .

[24]  S. Hulleman,et al.  Crystallinity in starch bioplastics , 1996 .

[25]  J F Vliegenthart,et al.  Crystallinity in starch plastics: consequences for material properties. , 1997, Trends in biotechnology.

[26]  P. Forssell,et al.  AFM in studies of thermoplastic starches during ageing , 1998 .

[27]  L. Avérous,et al.  Properties of thermoplastic blends: starch-polycaprolactone , 2000 .

[28]  P. Dole,et al.  Influence of photocrosslinking on the retrogradation of wheat starch based films , 2003 .