Authors: Niangui Wang; Lina Zhang

Source: Polymer International, Volume 54, Number 1, January 2005 , pp. 233-239(7)

Publisher: John Wiley & Sons, Ltd.

Abstract:

Utilizing anionic waterborne polyurethane (WPU) as a plasticizer, for the first time, we prepared new soy protein isolate (SPI) plastics. The WPU was prepared by using the emulsion-extending-chain method, and mixed with soy protein in aqueous dispersion. The mixture was cast, cured, pickled and hot-pressed to form SPI plastics plasticized with WPU. The plastics sheets were characterized by infrared spectroscopy, scanning electron microscopy, ultraviolet spectrophotometry and wide-angle X-ray diffraction, and their properties were measured by using dynamic mechanical analysis, differential scanning calorimetry and tensile testing. The results revealed that SPI plastics plasticized with WPU possess good mechanical properties, such as a tensile strength (_b) of 7–19 MPa, water resistance (_b(wet)/_b(dry) = 0.4–0.5), optical transmittance and thermal stability, because of the good miscibility and strong interaction between WPU and SPI. With an increase of WPU content from 20 to 50 wt%, the elongation at break (_b) value of the sheets increased from 50 up to 150 %, and is much higher than that of the pure SPI sheet. WPU as a plasticizer can play an important role in improving the properties of SPI plastics. Copyright © 2004 Society of Chemical Industry

Keywords: waterborne polyurethane; soy protein plastics; miscibility; plasticization behavior

Document Type: Research article

DOI: http://dx.doi.org/10.1002/pi.1696

Affiliations: 1: Department of Chemistry, Wuhan University, Wuhan 430072, China

Publication date: 2005-01-01

More about this publication?

• As of January 2010, this journal will no longer be available on IngentaConnect, please visit Wiley InterScience to arrange continued access to this content
• Access this journal at Wiley InterScience
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Chemical Engineering
• By this author: Niangui Wang ;  Lina Zhang

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers