AI Article Synopsis
- Cardanol, derived from cashew nut shell liquid, is a renewable resource that can be chemically modified to create side-chain epoxidized cardanol glycidyl ether (SCECGE), which has an epoxy functionality averaging 2.45.
- SCECGE was cured with various hardeners, compared to other resins like NC514 and DGEBA, showing that the secondary epoxides in SCECGE caused incomplete curing and therefore lower thermal stability and tensile properties.
- Despite the challenges of incomplete curing, the high functionality of SCECGE allows for similar performance to NC514, making it a promising candidate for eco-friendly epoxy formulations.
Article Abstract
Cardanol is a renewable resource based on cashew nut shell liquid (CNSL), which consists of a phenol ring with a C15 long aliphatic side chain in the meta position with varying degrees of unsaturation. Cardanol glycidyl ether was chemically modified to form side-chain epoxidized cardanol glycidyl ether (SCECGE) with an average epoxy functionality of 2.45 per molecule and was cured with petroleum-based epoxy hardeners, 4-4'-methylenebis(cyclohexanamine) and diethylenetriamine, and a cardanol-based amine hardener. For comparison, cardanol-based diphenol diepoxy resin, NC514 (Cardolite), and a petroleum-based epoxy resin, diglycidyl ether of bisphenol-A (DGEBA) were also evaluated. Chemical and thermomechanical analyses showed that for SCECGE resins, incomplete cure of the secondary epoxides led to reduced cross-link density, reduced thermal stability, and reduced elongation at break when compared with difunctional resins containing only primary epoxides. However, because of functionality greater than two, amine-cured SCECGE produced a very similar to that of NC514 and thus could be useful in formulating epoxy with renewable cardanol content.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7563135 | PMC |
| http://dx.doi.org/10.3390/polym12091956 | DOI Listing |
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