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Thangamani Rajkumar,Venugopalan Rajasudha,Arunjunai Raj Mahendran,Chinnaswamy Thangavel Vijayaku 한국고분자학회 2021 폴리머 Vol.45 No.4
Polyurethanes (PUs) were prepared from solvent and catalyst free reaction mixture containing polyethylene glycol (PEG), 4,4’-methylene diphenyl diisocyanate (MDI) and 1,3-bis(2-hydroxyethoxy) benzene (HER) and/or castor oil (CAO). PUs were characterized using the Fourier-transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (¹H NMR) spectroscopic methods. Thermal studies on PUs using differential scanning calorimetric (DSC) and thermogravimetric analysis coupled with FTIR (TG/FTIR) proved that CAO-extended PUs were thermally more stable than HER extended PUs. The partial and complete replacement of HER content in PUs using CAO enhanced the thermal stability by shifting degradation temperature to higher temperature (5-15 ℃) and enhancing the char residue. The parameters derived from DSC traces, thermogram and differential thermogram confirmed that PUs synthesized using PEG 1500 are thermally more stable than the PUs prepared using PEG 4000. The probable degradation mechanism to study the role of β-hydrogen on the thermal stability was proposed and discussed based on the results of TG/FTIR.
Siva Kaylasa Sundari Saravanamuthu,Shamim Rishwana Syed Mohammed,Ramani Ramasubbu,Arunjunai Raj Mahendran,Vijayakumar Chinnaswamy Thangavel 한국고분자학회 2022 폴리머 Vol.46 No.4
In this work, the synthesized nanoporous aluminum fumarate (Al_FA_A) metal organic framework (MOF) hasbeen used as reactive filler for the bisphenol-A dicyanate (BADCy) resin system. The use of Al_FA_A is interesting dueto the involvement of double bonds (fumarate) in triazine during polymerization. The thermal properties of the polymersformed with and without reactive filler were evaluated under different curing temperatures, prepolymerizations and postpolymerizations conditions. All the samples were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction analysis (XRD) andEvolved gas analysis. On the contrary, the cure chemistry was determined by non-isothermal model free kinetic methods. This study provides a new path to utilize the MOFs as reactive nanoparticle fillers to obtain multifunctional materials.