Rathika, G and Praveen Kanth, J (2022) Fully Bio‑based Polybenzoxazines Derived from Thymol: Thermal Stability, Hydrophobicity and Corrosion Resistant Properties. Journal of Polymers and the Environment. pp. 5301-5312.

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Abstract

In the present work, three types of bio-benzoxazines were synthesized from thymol using three structurally diferent amines
viz. octadecylamine, dodecylamine and furfurylamine through Mannich condensation. The molecular structure of bio-based
benzoxazines namely, TH-dda (thymol, dodecylamine), TH-oda (thymol, octadecylamine) and TH-fa (thymol, furfurylamine)
were characterized by Fourier transform infrared (FTIR) and 1
H-NMR spectroscopic techniques. The curing behaviour of
synthesized benzoxazines was studied using diferential scanning calorimetry (DSC). The occurrence of ring-opening and
cross-linking polymerization of TH-dda, TH-oda and TH-fa bio-based benzoxazines were studied by FTIR spectroscopy.
The thermal stability of thermally cross-linked polybenzoxazines, poly(TH-dda), poly(TH-oda) and poly(TH-fa) were
studied by thermogravimetric analysis (TGA). The results obtained from TGA indicate that among the polybenzoxazines
studied, poly(TH-oda) possesses the higher thermal stability than that of other polybenzoxazine samples viz., [poly(TH-dda)
and poly(TH-fa)]. The value of limiting oxygen index (LOI) for polybenzoxazine samples was calculated using char yield
obtained from TGA indicate that these benzoxazines exhibit good fame retardant characteristics. Data from water contact
angle studies infer that these samples possess good hydrophobic properties in the range of 134–139°. Results from corrosion studies infer that mild steel specimens coated with these benzoxazines were found to be more stable towards corrosion

Item Type: Article
Uncontrolled Keywords: Bio-benzoxazine · Thymol · Thermal stability · Flame retardance · Hydrophobicity · Corrosion resistance
Divisions: PSG College of Arts and Science > Department of Chemistry
Depositing User: Mr Team Mosys
Date Deposited: 23 Mar 2023 06:25
Last Modified: 23 Mar 2023 06:25
URI: http://ir.psgcas.ac.in/id/eprint/1814

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