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Citation: WANG Shu-Sheng, DENG Peng-Yang, RAN Xiang-Hai, HAN Chang-Yu, BIAN Jun-Jia, DONG Li-Song. Structure and Properties of Starch Extruded Foams with Water as Blowing Agent[J]. Chinese Journal of Applied Chemistry, ;2010, 27(7): 759-763. doi: 10.3724/SP.J.1095.2010.90705 shu

Structure and Properties of Starch Extruded Foams with Water as Blowing Agent

a. Changchun Institute of Applied Chemistry, Changchun 130022;
b. Jilin Agricultural University, Changchun 130022;
c. Graduate University of Chinese Academy of Science, Beijing

Received Date: 28 October 2009
Revised Date: 4 January 2010

Starch foams were prepared with a twin-screw extruder from normal corn starch as raw material and water as blowing agent. The effects of blowing agent content and blend of poly(vinyl ethanol) on the structure and properties of the extruded foams were studied. The structure and mechanical properties of starch foams were characterized by means of a scanning electron microscope and a universal material testing machine respectively. The results indicate that the starch foams extruded with 8% (mass fraction) water reached the greatest radial expansion ratio and volume expansion ratio,which were 22 and 17.6 respectively,and the greatest compressive modulus(4.07 MPa). The extruded starch foams blended with 10% (mass fraction) PVA reached greater cell size(1.29 mm),cell thickness(82.43 μm),and compressive modulus(9.70 MPa).
- water as blowing agent,
- extruded starch foam,
- structure,
- property
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