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Studies on the structural changes during curing of epoxy and its blend with CTBN
Kavita Srivastava1, Ashwani Kumar Rathore2, Deepak Srivastava3
1Department of Chemistry, V.S.S.D. College, Nawab Ganj, Kanpur 208 002, U.P., India.
Summary
Cardanol-based epoxy resins, derived from renewable cashew nut shell liquid, show altered curing and decomposition behaviors when blended with carboxyl terminated poly (butadiene-co-acrylonitrile) (CTBN) liquid rubber.
Area of Science:
- Materials Science
- Polymer Chemistry
- Sustainable Chemistry
Background:
- Cashew nut shell liquid (CNSL) is a renewable resource yielding cardanol.
- Cardanol can be polymerized into phenolic resins and modified into epoxidized novolacs.
- These bio-based epoxies offer sustainable alternatives in polymer applications.
Purpose of the Study:
- To investigate the curing and structural changes of cardanol-based epoxidized novolac (CEN) resins.
- To evaluate the effect of incorporating carboxyl terminated poly (butadiene-co-acrylonitrile) (CTBN) on CEN resin properties.
- To analyze the thermal decomposition behavior of the modified epoxy blends.
Main Methods:
- Synthesis of cardanol-based epoxidized novolac (CEN) resin.
- Preparation of CEN/CTBN blends with varying CTBN content (0-20 wt%).
- Analysis of structural changes during curing using Fourier-transform infrared (FTIR) spectroscopy.
- Thermal decomposition analysis using thermogravimetric analyzer (TGA).
Main Results:
- FTIR spectra confirmed the presence of phenolic hydroxyl and opened epoxide groups.
- Incorporation of CTBN decreased the cure temperature of the CEN resin.
- TGA revealed a two-step decomposition behavior for both pure CEN resin and its CTBN blends.
Conclusions:
- Cardanol-derived epoxidized novolac resins can be effectively modified with CTBN.
- CTBN acts as a reactive diluent, influencing curing kinetics and thermal properties.
- These bio-based epoxy systems demonstrate potential for advanced material applications.
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