Compression molding and tensile properties of thermoplastic potato starch materials

Biomacromolecules
Mats ThunwallMikael Rigdahl

Abstract

The mechanical and melt flow properties of two thermoplastic potato starch materials with different amylose contents were evaluated. The materials were prepared by mixing starch, glycerol, and water, mainly in the weight proportions of 10:3:4.5. Compression molding was used to produce sheets/films with a thickness in the range of 0.3-1 mm. After conditioning at 53% relative humidity (RH) and 23 C, the glycerol-plasticized sheets with a higher amylose content (HAP) were stronger and stiffer than the normal thermoplastic starch (NPS) with an amylose content typical for common potato starch. The tensile modulus at 53% RH was about 160 MPa for the high-amylose material and about 120 MPa for the plasticized NPS. The strain at break was about 50% for both materials. The stress at break was substantially higher for the HAP materials than for the NPS materials, 9.8 and 4.7 MPa, respectively. Capillary viscometry at 140 C showed that the high-amylose material had a higher melt viscosity and was more shear-thinning than the NPS. Dynamic mechanical measurements indicated a broad transition temperature range for both types of starch material. The main transition peaks for glycerol-plasticized starch were located at about room temperature w...Continue Reading

References

Sep 8, 1998·International Journal of Biological Macromolecules·A BuléonS Ball

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Citations

May 8, 2013·Carbohydrate Polymers·Luciana CastilloMarcelo Villar
May 4, 2011·Journal of Food Science·Kuorwel K KuorwelStephen W Bigger
May 22, 2013·Carbohydrate Polymers·Yu-Rong ZhangYu-Zhong Wang
Feb 26, 2014·Critical Reviews in Food Science and Nutrition·Yachuan ZhangQiang Liu
Nov 13, 2015·Journal of the Science of Food and Agriculture·Diana Gómez-HeinckeCríspulo Gallegos
May 27, 2020·The Analyst·Rajamanickam Sivakumar, Nae Yoon Lee
May 28, 2021·Biomacromolecules·Hongchen LiuHaisong Qi
Jan 27, 2015·ACS Applied Materials & Interfaces·Luca CeseracciuIlker S Bayer

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