Synthesis of macromolecular brush and its thermal degradation studies S. Siva Kaylasa Sundari, S. Shamim Rishwana, S. Poornimadevi, C. T. Vijayakumar International Journal of Polymer Analysis and Characterization, 2022 The di-1,2-propanediol ester of fumaric acid (Diol) is synthesized and polymerized to yield the macromolecular brush (PDiol). The structure of monomers and their polymer is confirmed by Fourier transform infrared spectroscopy (FTIR) studies. The PDiol material shows the number average molecular weight (Mn) as 951 g/mol, weight average molecular weight (Mw) as 4,378 g/mol, and a polydispersity index (PDI) of 4.6. The hydroxyl value for PDiol is 471 (mg KOH/g). The thermal degradation property of the brush is investigated using thermogravimetric analysis (TGA). The cyclic intra and inter loops are formed while annealing at a temperature of around 200 °C. Using the TG curves recorded at different heating rates and by applying advanced isoconversional methods by model-free kinetics, the apparent activation energy for the thermal degradation (Ea-D) at different reaction extents (α) are calculated and discussed. Advanced methods are also used to refine the apparent activation energy data. The Ea-D values for PDiol range from 100 to 155 kJ/mol. For a lifetime of 20,000 h, the 20% degraded PDiol can withstand a temperature of 39 °C.
Thermal curing characteristics of bisbenzoxazines based on 4,4'- diaminodiphenyl sulfone and 4,4'- dihydroxy diphenyl sulfone and thermal degradation of thermosets derived from these monomers A Comprehensive Guide to Formaldehyde, 2021
Nanoporous metal organic frameworks: Effect of thermal history on crystallinity and thermal stability Multidisciplinary Science and Advanced Technologies, 2021
Synthesis and thermal studies of bis(isomaleimide)/bisphenol A and ortho novalac blends Vijayakumar Sarannya, S Shamim Rishwana, Rajaram Mahalakshmy, Arunjunai Raj Mahendran, R Surender, Chinnaswamy Thangavel Vijayakumar Journal of Elastomers and Plastics, 2020 Phenol formaldehyde ortho novalac (ON) resin and 4,4′-bisisomaleimidodiphenyl methane (VS) were prepared. Bisphenol A (BPA) and ON were blended with VS in different ratios and thermally cured. The structural characterization of the synthesized and polymerized materials was done using Fourier transform infrared (FTIR) spectroscopy. The thermal curing properties of VS and its blends were investigated using differential scanning calorimetry. The temperature at which the rate of curing was maximum ( T max) was found to be varying from 210°C to 220°C. The degradation properties of the polymerized VS and its blends were studied using thermogravimetric analysis. The Friedman, corrected Flynn–Wall–Ozawa, corrected Kissinger–Akahira–Sunose, and advanced Vyazovkin methods are used to calculate the Ea-D for various reaction extents ( α). The variation of ln A with the α and thermal lifetime for these materials were predicted. The volatile products obtained during the thermal degradation of these polymers are analyzed using thermogravimetric-FTIR.
Bis(isomaleimide) and diphenol blends: Non-isothermal degradation kinetics and TG-FTIR studies V Sarannya, S Shamim Rishwana, R Mahalakshmy, A Mahendran, CT Vijayakumar Journal of Elastomers and Plastics, 2019 Blends of 4,4′-bisisomaleimidodiphenyl methane (VS) with structurally different diphenols are made in 1:1 molar ratio and thermally polymerized. Thermogravimetric studies of the cured materials show that the thermal stability, the degradation pattern and the char yield are much dependent on the structure of the diphenol that is used for blending. The decreased thermal stability of materials from the blends is attributed to decreased cross links owing to the opening of the isomaleimide rings by diphenols during thermal polymerization. The materials with trimethylphenylindane and tetramethylspirobiindane units exhibit char residue of 21% at 800°C. This is due to the thermal stability of the indane and spirobiindane moieties present in the diphenol molecules. The apparent activation energy for thermal degradation ( Ea-D) and pre-exponential factor (ln A) are derived. The Friedman, corrected Flynn–Wall–Ozawa, corrected Kissinger–Akahira–Sunose and advanced Vyazovkin methods are used to calculate the Ea-D values for various reaction extents ( αs). The Ea-D values of poly(4,4′-bisisomaleimido-diphenyl methane) vary from 168 to 226 kJ mol−1. A slight decrease in Ea-D is noted for the initial α levels and increases constantly up to α = 0.3–0.75 and then the Ea-D values decrease with increasing α values. The highest values of Ea-D and ln A are observed for the polymer derived from the blend of VS with tetramethylspirobiindane diphenol. The volatile products obtained during the thermal degradation of these polymers are analysed using thermogravimetry–Fourier transform infrared (TG-FTIR) spectroscopy. The TG-FTIR studies showed the compounds carbon monoxide, carbon dioxide and aromatic amines are the major degradation products from the polymerized blends.
Synthesis of CdTe quantum dots using Glutathione promoted in Vitro Interaction between Lysozyme and Flavanoids: An investigation through spectroscopic methods E Vaishnavi, K Balasubramaniam, K Nagaraj, MA Wadaan, P Maity, ... Journal of Molecular Structure 1306, 137818 , 2024 2024.0 Citations: 11
Application of Metal-Organic Framework as Reactive Filler in Bisphenol-A-Based High-Temperature Thermosets VC Thangavel, SKS Saravanamuthu, AR Mahendran, SRS Mohammed Recent Developments in Nanofibers Research , 2022 2022.0 Citations: 1
Application of Metal-Organic Framework as Reactive Filler in Bisphenol-A-Based High-Temperature Thermosets CT Vijayakumar, SSK Sundari, MA Raj, SMS Rishwana IntechOpen , 2022 2022.0
Effect of Structure of Diphenol on Polymerization of Bis (isoimide) V Sarannya, R Surender, SS Rishwana, R Mahalakshmy, CT Vijayakumar Advanced Polymeric Materials, 143-170 , 2022 2022.0
Particulate reinforcements in dicyanate composites with nanoporous aluminum fumarate as reactive filler: Thermal properties SKS Saravanamuthu, SRS Mohammed, R Ramasubbu, AR Mahendran, ... 폴리머 46 (4), 426-435 , 2022 2022.0 Citations: 2
Synthesis of macromolecular brush and its thermal degradation studies S Siva Kaylasa Sundari, S Shamim Rishwana, S Poornimadevi, ... International Journal of Polymer Analysis and Characterization 27 (3), 147-157 , 2022 2022.0 Citations: 2
Improvement in electrical and mechanical properties of di/trifunctional epoxies-based hybrid composites having metal organic frameworks (MOFs) as nanoparticulate filler S Siva Kaylasa Sundari, S Shamim Rishwana, R Ramani, ... MRS Communications 12 (2), 250-256 , 2022 2022.0 Citations: 6
Effect of structural variation on the thermal degradation of nanoporous aluminum fumarate metal organic framework (MOF) SSK Sundari, SS Rishwana, TM Kotresh, R Ramani, RI Shekar, ... Journal of Thermal Analysis and Calorimetry 147 (8), 5067-5085 , 2022 2022.0 Citations: 21
Synthesis and thermal studies of bis (isomaleimide)/bisphenol A and ortho novalac blends V Sarannya, SS Rishwana, R Mahalakshmy, AR Mahendran, R Surender, ... Journal of Elastomers & Plastics 52 (6), 495-520 , 2020 2020.0 Citations: 3
Bis (isomaleimide) and diphenol blends: Non-isothermal degradation kinetics and TG-FTIR studies V Sarannya, SS Rishwana, R Mahalakshmy, A Mahendran, ... Journal of Elastomers & Plastics 51 (7-8), 644-668 , 2019 2019.0 Citations: 1
Bis (isomaleimide) and diphenol blends: Part 1 Studies on thermal curing and thermal degradation V Sarannya, S Shamim Rishwana, R Surender Sci Lett J 5, 240 , 2017 2017.0 Citations: 2
Bis(isomaleimide) and diphenol blends: part 1 Studies on thermal curing and thermal degradation RMCTV V. Sarannya, S. Shamimn Rishwana Science letters journals , 2017 2017.0
Studies on structurally different diamines and bisphenol benzoxazines: synthesis and curing kinetics SS Rishwana, G Pitchaimari, CT Vijayakumar High Performance Polymers 28 (4), 466-478 , 2016 2016.0 Citations: 18
Studies on structurally different benzoxazines: Curing characteristics and thermal degradation aspects SS Rishwana, A Mahendran, CT Vijayakumar High Performance Polymers 27 (7), 802-812 , 2015 2015.0 Citations: 16
Studies on structurally different benzoxazines based on diphenols and diamines: Kinetics of thermal degradation and TG-FTIR studies SS Rishwana, A Mahendran, CT Vijayakumar Thermochimica Acta 618, 74-87 , 2015 2015.0 Citations: 29
Structurally diverse benzoxazines: synthesis, polymerization, and thermal stability CT Vijayakumar, S Shamim Rishwana, R Surender, N David Mathan, ... Designed Monomers and Polymers 17 (1), 47-57 , 2014 2014.0 Citations: 34
Siva Kaylasa Sundari S, Arunjunai Raj M, Shamim Rishwana S (2023) Application of metal-organic framework as reactive filler in bisphenol-a-based high-temperature thermosets … CT Vijayakumar Recent Developments in Nanofibers Research. doi 10 , 0
Synthesis and characterization of polybenzoxazine CT Vijayakumar Chennai , 0
MOST CITED SCHOLAR PUBLICATIONS
Structurally diverse benzoxazines: synthesis, polymerization, and thermal stability CT Vijayakumar, S Shamim Rishwana, R Surender, N David Mathan, ... Designed Monomers and Polymers 17 (1), 47-57 , 2014 2014.0 Citations: 34
Studies on structurally different benzoxazines based on diphenols and diamines: Kinetics of thermal degradation and TG-FTIR studies SS Rishwana, A Mahendran, CT Vijayakumar Thermochimica Acta 618, 74-87 , 2015 2015.0 Citations: 29
Effect of structural variation on the thermal degradation of nanoporous aluminum fumarate metal organic framework (MOF) SSK Sundari, SS Rishwana, TM Kotresh, R Ramani, RI Shekar, ... Journal of Thermal Analysis and Calorimetry 147 (8), 5067-5085 , 2022 2022.0 Citations: 21
Studies on structurally different diamines and bisphenol benzoxazines: synthesis and curing kinetics SS Rishwana, G Pitchaimari, CT Vijayakumar High Performance Polymers 28 (4), 466-478 , 2016 2016.0 Citations: 18
Studies on structurally different benzoxazines: Curing characteristics and thermal degradation aspects SS Rishwana, A Mahendran, CT Vijayakumar High Performance Polymers 27 (7), 802-812 , 2015 2015.0 Citations: 16
Synthesis of CdTe quantum dots using Glutathione promoted in Vitro Interaction between Lysozyme and Flavanoids: An investigation through spectroscopic methods E Vaishnavi, K Balasubramaniam, K Nagaraj, MA Wadaan, P Maity, ... Journal of Molecular Structure 1306, 137818 , 2024 2024.0 Citations: 11
Improvement in electrical and mechanical properties of di/trifunctional epoxies-based hybrid composites having metal organic frameworks (MOFs) as nanoparticulate filler S Siva Kaylasa Sundari, S Shamim Rishwana, R Ramani, ... MRS Communications 12 (2), 250-256 , 2022 2022.0 Citations: 6
Synthesis and thermal studies of bis (isomaleimide)/bisphenol A and ortho novalac blends V Sarannya, SS Rishwana, R Mahalakshmy, AR Mahendran, R Surender, ... Journal of Elastomers & Plastics 52 (6), 495-520 , 2020 2020.0 Citations: 3
Particulate reinforcements in dicyanate composites with nanoporous aluminum fumarate as reactive filler: Thermal properties SKS Saravanamuthu, SRS Mohammed, R Ramasubbu, AR Mahendran, ... 폴리머 46 (4), 426-435 , 2022 2022.0 Citations: 2
Synthesis of macromolecular brush and its thermal degradation studies S Siva Kaylasa Sundari, S Shamim Rishwana, S Poornimadevi, ... International Journal of Polymer Analysis and Characterization 27 (3), 147-157 , 2022 2022.0 Citations: 2
Bis (isomaleimide) and diphenol blends: Part 1 Studies on thermal curing and thermal degradation V Sarannya, S Shamim Rishwana, R Surender Sci Lett J 5, 240 , 2017 2017.0 Citations: 2
Application of Metal-Organic Framework as Reactive Filler in Bisphenol-A-Based High-Temperature Thermosets VC Thangavel, SKS Saravanamuthu, AR Mahendran, SRS Mohammed Recent Developments in Nanofibers Research , 2022 2022.0 Citations: 1
Bis (isomaleimide) and diphenol blends: Non-isothermal degradation kinetics and TG-FTIR studies V Sarannya, SS Rishwana, R Mahalakshmy, A Mahendran, ... Journal of Elastomers & Plastics 51 (7-8), 644-668 , 2019 2019.0 Citations: 1
Application of Metal-Organic Framework as Reactive Filler in Bisphenol-A-Based High-Temperature Thermosets CT Vijayakumar, SSK Sundari, MA Raj, SMS Rishwana IntechOpen , 2022 2022.0
Effect of Structure of Diphenol on Polymerization of Bis (isoimide) V Sarannya, R Surender, SS Rishwana, R Mahalakshmy, CT Vijayakumar Advanced Polymeric Materials, 143-170 , 2022 2022.0
Bis(isomaleimide) and diphenol blends: part 1 Studies on thermal curing and thermal degradation RMCTV V. Sarannya, S. Shamimn Rishwana Science letters journals , 2017 2017.0
Siva Kaylasa Sundari S, Arunjunai Raj M, Shamim Rishwana S (2023) Application of metal-organic framework as reactive filler in bisphenol-a-based high-temperature thermosets … CT Vijayakumar Recent Developments in Nanofibers Research. doi 10 , 0
Synthesis and characterization of polybenzoxazine CT Vijayakumar Chennai , 0