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Development of functionalized SiO2–TiO2 reinforced cardanol and caprolactam modified diamine based polybenzoxazine nanocomposites for high performance applications

  • T. Lakshmikandhan
  • Arumugam Hariharan
  • K. Sethuraman
  • Muthukaruppan AlagarEmail author
Article
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Abstract

In the present work, three types of polybenzoxazines were synthesized using caprolactam-based diamine (CPA-NH2) and formaldehyde with different phenols, namely 4-fluorophenol, cardanol, and phenol, under appropriate experimental conditions. The molecular structure of the benzoxazine monomers was confirmed by FTIR, 1H, and 13C NMR spectroscopic techniques. Polybenzoxazines were obtained through ring-opening polymerization of benzoxazine monomers, and their formation was confirmed by FTIR spectroscopy. The elemental composition and morphological behavior of polybenzoxazines were characterized by SEM-EDAX and AFM techniques. The naturally occurring cardanol- and caprolactam-based diamine (CPA-NH2)-based benzoxazine was selected for detailed studies. The synthesized SiO2–TiO2 nanohybrid reinforcement was functionalized with 3-aminopropyltrimethoxysilane (3-APS) and reinforced with cardanol-based benzoxazine (CPBz) monomer. The resulted nanocomposites were studied for their corrosion protection behavior against mild steel surface along with thermomechanical (TGA and DMA) and morphological (SEM, XRD, and TEM) properties. The results obtained from electrochemical impedance analysis indicate that the 5 wt% of F–SiO2–TiO2 of reinforced CPBz exhibits an effective corrosion-resistant behavior toward surface of steel specimen than that of other samples.

Keywords

Cardanol-based benzoxazine Functionalized SiO2–TiO2 Thermomechanical properties Nanocomposites Storage modulus Glass transition temperature Anticorrosion properties 

Notes

Supplementary material

11998_2019_263_MOESM1_ESM.docx (1.3 mb)
Supplementary material 1 (DOCX 1306 kb)

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Copyright information

© American Coatings Association 2019

Authors and Affiliations

  1. 1.Department of ChemistryBharath Institute of Higher Education and ResearchSelaiyur, ChennaiIndia
  2. 2.Polymer Engineering LaboratoryPSG Institute of Technology and Applied ResearchNeelambur, CoimbatoreIndia
  3. 3.Polymer Composite Laboratory, Department of Chemical EngineeringAnna UniversityChennaiIndia

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