Polyurethane/Soya Protein Isolate Green Composites: Spectral, Microstructural, Thermal, Swelling, and Biodegradation Behaviors. Issue 2 (22nd February 2016)

• Record Type: Journal Article
• Authors: Madhukar, B. S.; Bhadre Gowda, D. G.; Hemalatha, K.; Somashekar, R.; Siddaramaiah,
• Is Part Of: Advances in polymer technology. Volume 37:Issue 2(2018)
• Page Start: 399
• Page End: 410
• Publication Date: 2016-02-22
• Subjects: Biodegradation -- Green composites -- Microstructural parameters -- Structure–property relationship -- Thermal behaviors; Plastics -- Periodicals; Polymers -- Periodicals; 668.9
• DOI: 10.1002/adv.21679
• Languages: English
• ISSNs: 0730-6679

Abstract

ABSTRACT: A series of polyurethane (PU) green composites were synthesized with varying amounts, viz. 0, 2, 4, 8, and 12 wt% of soya protein isolate (SPI). Formation of the urethane linkage in the prepared green composites is revealed by infrared spectroscopy. The glass transition temperature ( T g ) of the fabricated PU/SPI composites has been evaluated by differential scanning calorimeter. Thermal stability and degradation analysis of the PU/SPI composites have been performed using a thermogravimetric analyzer (TGA). TGA thermograms clearly revealed that the fabricated composites were thermally stable upto 181°C and show a three‐step of thermal degradation. The water uptake behaviors of PU/SPI systems have been studied at different chemical environments such as distilled water, salt solution, acidic and alkaline solutions. The microcrystalline parameters such as crystallite size (〈 N 〉) and surface weighted crystal size ( Ds ) have been evaluated from wide‐angle X‐ray scattering profiles using two different asymmetric distribution functions. PU/SPI green composites were subjected to biodegradation in the presence of Aspergillus niger . The structure–property response of the PU/SPI green composites has been established on the basis of these parameters.