Development of agar based bioplastics by cross-linking with diisocyanates

Non-Confidential description of the invention

A cost effective biopolymer, agar extracted from seaweeds for its application as bioplastic. The moderate strength and high water absorption property of agar restricted its applicability as bioplastic material. We cross-linked agar by diisocyanates for the first time to limit the water absorption and improved the mechanical properties. There were three kinds of diisocyanates, two aromatic [1, 4 Phenyl Diisocyanate (PDI) and 4, 4 Diphenyl Diisocyanate (DDI)] and one aliphatic [1, 6 Hexamethylene Diisocyanate (HDI)] used for cross-linking agar. Aromatic diisocyanate cross-linked agar more efficiently than the aliphatic diisocyanate due to higher reactivity. It was confirmed from the FTIR spectra that carbamate cross-link network was formed in the cross-linked agar. Cross-linking with diisocyanates improved the mechanical and thermal properties of agar with a noticeable reduction in the water uptake. Moreover, the role of cross-linker shape is observed on cross-linked agar properties. Agar cross-linked with PDI and DDI has higher strength and thermal resistance than the HDI cross-linked agar. It showed that PDI, DDI cross-linked agar efficiently than HDI due to higher reactivity.

Inventors

Dr.Vivek Verma (MSE), Dr.Ramanathan Gurunath (Chem), Mr. Amit Kumar Sonker(Research Scholar,MSE),Mr.Mezigebu Belay(Research Scholar,MSE), Mr.KousarJahan(Research Scholar,MSE)

IPA

201811002306

Date of Filing

19/01/2018

Status

Complete

Date Of Grant

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