The research work focused on the preparation of biobased eugenol benzoxazine (EUBz) using thiourea as amine resource and their conversion into EUBz‐epoxy (EUBz‐EP) blend matrix and EUBz‐EP blend composites. In the present work, thiourea‐based eugenol‐benzoxazine monomer was synthesized using eugenol as phenolic compound, thiourea as amine resource and paraformaldehyde. The molecular structure of monomer was confirmed by FTIR, NMR, and Maldi mass studies. The thiourea‐based EUBz properties were enhanced by the blending of EP resin and reinforced with varying weight percentages of amine functionalized cashew nut shell carbon (f‐CSC). The thermally cured f‐CSC/EUBz‐EP composites possesses a higher glass transition temperature of 202.9°C when compared to that of the EUBz matrix (104.2°C), which might arise due to the higher crosslinking density resulted from the reinforcement of EP resin with f‐CSC. In addition, the hydrophobic behavior of the prepared composite materials is improved by blending the EUBz with EP resin and reinforcing with f‐CSC. The enhancement of the value of contact angle from 80.3° to 105.9° infers the improvement of hydrophobic behavior of f‐CSC reinforced EUBz‐EP blend composites. The corrosion rate and protection efficiency of 5 wt% f‐CSC/EUBz‐EP composites exhibits 0.814 (mm/year) and 99.97%, respectively. Data obtained from different studies suggested that the f‐CSC reinforced EUBz‐EP blended composites can be used in the form of sealants, encapsulants, adhesives, and coatings for different industrial and engineering applications.

中文翻译：

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腰果壳碳增强硫脲基生物酚基苯并恶嗪-环氧复合材料的开发：高性能生物基涂料

研究工作集中在使用硫脲作为胺资源制备生物基丁香酚苯并恶嗪（EUBz）并将其转化为EUBz-环氧（EUBz-EP）混合基质和EUBz-EP混合复合材料。在目前的工作中，以丁香酚为酚类化合物，以硫脲为胺源和多聚甲醛合成了基于硫脲的丁香酚-苯并恶嗪单体。单体的分子结构已通过FTIR，NMR和Maldi质量研究得到证实。EP树脂的共混提高了硫脲基EUBz的性能，并用不同重量百分比的胺官能化腰果壳碳（f- CSC）增强了硫脲基的EUBz性能。热固化的f-与EUBz基质（104.2°C）相比，CSC / EUBz-EP复合材料的玻璃化转变温度更高，为202.9°C，这可能是由于用f -CSC增强EP树脂而产生的更高的交联密度引起的。此外，通过将EUBz与EP树脂共混并用f- CSC增强，可以改善所制备复合材料的疏水性。接触角的值从80.3°增至105.9°可以改善f ‐CSC增强的EUBz-EP共混物的疏水性能。5 wt％f -CSC / EUBz-EP复合材料的腐蚀速率和防护效率分别为0.814（mm / year）和99.97％。从不同研究获得的数据表明，f CSC增强的EUBz-EP共混复合材料可以以密封剂，密封剂，胶粘剂和涂料的形式用于不同的工业和工程应用。