Adenopus breviflorus benth oil (ADBO) monomer bearing azide moiety was prepared by nucleophillic addition of sodium azide to the epoxidised ADBO to yield azidated ADBO and the oil monomer bearing alkyne moiety was prepared by reacting epoxidised ADBO with propargyl alcohol in the presence of Zinc Chloride catalyst. Polymers series were then prepared by reacting the alkynylated ADBO as well as other suitable aliphatic and aromatic diynes with the azidated ADBO by thermal ‘Click’ reactions under solvent and catalyst free conditions to yield cross-linked biopolymers. Characterization of the biopolymers was by FTIR, 1HNMR, DSC, TGA, GPC and DMA. Addition of a terminal triple bonds or azide group to the fatty acid chain of ADBO by ring opening nucleophillic addition was facile. Monomers of azidated ADBO and alkynylated ADBO readily underwent polymerization with each other and with suitable cross-linkers by simply heating at 1000C. While curing of azidated ADBO with either aliphatic or aromatic diyne happened in six hours, that of azidated ADBO with alkynylated ADBO took eighteen hours. Polymers prepared using aromatic diyne showed higher glass transition, cross-link density and stiffness compared to that prepared using aliphatic diyne. Polymer prepared from azidated and alkynylated ADBO though possessed shorter network chains and thereby lower tensile strength; however displayed better damping characteristics compared to those prepared from azidated ADBO and organic diynes cross-linkers. There is a strong correlation between crosslinking density and thermal and surface properties of the biopolymers.

Studies into the preparation of Adenopus breviflorus benth oil cast resin via catalyst and solvent free thermal click chemistry

256th National Meeting (2018)

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