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Studies on the blends of modified epoxy resin and carboxyl-terminated polybutadiene (CTPB)—II: thermal and mechanical characteristics

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Abstract

Blend samples were prepared by physical mixing of resole–epoxy blend with carboxyl-terminated polybutadiene (CTPB) liquid rubber ranging between 0 and 25 wt% in the interval of 5 wt%. Resoles were synthesized with phenol and various alkyl phenols. The blends were cured with 40 wt% polyamide. The structural changes during the curing were investigated by infra-red spectroscopic analysis. The presence of CTPB in resole-epoxy blends did not affected the values of cure times and ΔH whereas the gel time decreased up to 15 wt% addition of CTPB in the blends. The blend systems containing p-cresolic resole, epoxy and CTPB showed minimum gel time amongst all other blend samples. A clear-cut two-step mass loss in thermogravimetric (TG) trace of unmodified and CTPB-modified systems was observed. The mechanical properties of the blend samples were found to be affected by the CTPB addition. The plane strain fracture toughness (K IC) values of CTPB-modified matrix resins were greater that that for the unmodified resole/epoxy blends. This was further verified by scanning electron microscopic (SEM) analysis.

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Acknowledgements

This work was sponsored by All India Council of Technical Education (AICTE), New Delhi under TAPTECH scheme. Also, we thankfully acknowledge the contributions rendered by M/s Emerald Performance Materials, LLC, Hong Kong for providing CTPB as free gift sample.

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  1. Department of Plastic Technology, H. B. Technological Institute, Kanpur, 208 002, U.P., India

    Shailesh Kumar Shukla & Deepak Srivastava

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  1. Shailesh Kumar Shukla
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  2. Deepak Srivastava
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Correspondence to Deepak Srivastava.

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Shukla, S.K., Srivastava, D. Studies on the blends of modified epoxy resin and carboxyl-terminated polybutadiene (CTPB)—II: thermal and mechanical characteristics. J Mater Sci 42, 3215–3222 (2007). https://doi.org/10.1007/s10853-006-1359-y

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  • DOI: https://doi.org/10.1007/s10853-006-1359-y

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