Synthesis, characterisation and non-isothermal degradation kinetics of novel poly(mono ethylene glycol dimethacrylate-co-4-aminobenzoate)

Abstract

Synthesis of a novel co-polymer made by the addition polymerisation between MEGDMA and 4-AB by aza-Michael addition (AMA) polymerisation method is a fascinating field of research. The present investigation yielded a hazardous metal catalyst-free and toxic solvent-free methodology. The AMA polymerisation was carried out at five different [M 1 /M 2 ] values under N 2 atmosphere at 100 • C for 2 h. Thus, obtained co-polymer was characterized by Fourier transform infrared spectroscopy, UV-visible reflectance spectroscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis and scanning electron microscopy (SEM). The SEM image confirmed the formation of polymer nanoparticles. The non-isothermal degradation kinetics was followed with four different models, such as Flynn-Wall-Ozawa, Auggis-Bennet, Kissinger and Friedman method. Among the models used, the Kissinger method yielded the lowest degradation kinetics. The degradation kinetics of the co-polymer was followed with the help of model-free methods. Moreover, it was critically compared with the literature.

Micro structural and non‐isothermal crystallization and degradation kinetics studies on manganese thioglycolate end capped poly(ε‐caprolactone)

“…The decomposition temperature ( T d ) of PCL was found to be increased while increasing the heating rate from 10 to 30°C/min. The similar trend was observed for initial and final decomposition temperatures of PCL with the rising heating rate . The major weight loss accompanied with the breaking of PCL backbone started around 270°C for the heating rate of 10°C/min.…”

“…Hence, it was concluded that T d is increased proportionally with the increasing heating rates. The E a for the thermal degradation of PCL was calculated by the well‐known non‐isothermal kinetics models . In FWO model, the E a value was estimated as135.8 kJ mol −1 from the plot of lnβ versus 1,000/ T d as shown in Fig.…”

Optical, thermal, mechanical properties, and non‐isothermal degradation kinetic studies on PVA/CuO nanocomposites

“…All the thermograms showed three‐step degradation processes. It was found that the degradation steps interestingly shift toward higher temperature with the increasing heating rates . It was further confirmed by DTG thermograms as shown in Fig.…”

“…where, W o refers to the initial weight of the sample, W t is the weight at any specified temperature, and W f is the weight of the sample at the end of the process. In FWO method , the measurement of temperature is based on the fixed value, α at different heating rates. The E a is measured without knowing the reaction mechanism and order.…”

“…This method gives more accurate E a value as compared with other models. It proposes the following equation : …”