Synthesis and molecular characterization of chitosan/starch blends based polyurethanes

• Published in: International journal of biological macromolecules 2020-03, Vol.146, p.243-252
• Main Authors: Javaid, Muhammad Asif, Zia, Khalid Mahmood, Zafar, Kashif, Khosa, Muhammad Kaleem, Akram, Nadia, Ajmal, Muhammad, Imran, Muhammad, Iqbal, Muhammad Naeem
• Format: Article
• Language: English
• Subjects: Chitosan; Modified polyurethanes; Starch
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2019.12.234

Starch/chitosan modified polyurethanes (PUs) were synthesized by step growth polymerization reaction between −NCO terminated prepolymer and chain extenders (1,4-Butanediol/starch/chitosan). Isophorone diisocyanate (IPDI) was reacted with hydroxyl-terminated polybutadiene (HTPB) to synthesize prepolymer and was further reacted with different moles ratio of starch/chitosan to produced five samples of polyurethane (PU). These samples were characterized by Fourier transformed infrared (FTIR) and Proton nuclear magnetic resonance (1H NMR) spectroscopy. The surface characterizations of PUs were done by scanning electron microscope (SEM). Thermogravimetric analysis showed that the thermal stability of PUs was higher when the mixture of both natural materials was used at equal amounts. It is concluded that combination of both starch and chitosan are efficient for the synthesis of PUs. [Display omitted] •Chitosan and starch based PUs has been prepared by using different moles ratio.•Reaction of chitosan and starch in the PU was monitored by FTIR and 1HNMR spectroscopy.•Surface characterization was done by using scanning electron microscopy.•GPC was used to confirm the role of chitosan and starch as chain extenders.•Thermal degradation behavior of PUs was influenced by using chitosan and starch.