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.
Congo red (CR) dye functionalized magnetic nanoparticle was synthesized and characterized by Fourier Transform Infra Red, UV-visible, fluorescence emission spectra, field emission scanning electron microscopy and vibrating sample magnetometry like analytical techniques. The prepared nanohybrid was chemically tagged with poly(ε-caprolactone) (PCL) via ring opening polymerization of ε-caprolactone. The PCL/Fe 3 O 4-CR nanocomposites were characterized by the same techniques and differential scanning calorimetry and thermogravimetric analysis methods. The magnetic moment values of the Fe 3 O 4 after the formation of the nanohybrid and nanocomposite were found to be reduced due to the encapsulation and surface functionalization effects. The magnetic moment value of Fe 3 O 4 was decreased for the nanohybrid and nanohyrbid tagged PCL. The non-isothermal degradation kinetics was characterized in order to find out the energy of activation (E a) for the thermal degradation of the PCL. For the sake of comparison, the non-isothermal degradation kinetics of the methylorange functionalized Fe 3 O 4 end capped PCL was carried out and the results were critically compared.
Poly(ethylene terephthalate) (PET) was synthesized by two steps, namely (a) transesterification and (b) polycondensation. Various analytical instruments were used for the characterization of neat PET. The sodium salt of nucleating agents added with PET was synthesized by the in‐situ method under the same experimental conditions. The influence of CO2Na, ONa, SO3Na, PO3Na on the crystallization properties of PET was tested. The aromatic SO3Na nucleated PET exhibited the highest crystallization temperature (Tc) value of 211.4°C with the degradation temperature (Td) value of 446.9°C. The energy of activation (Ea) for the degradation and crystallization of PET was determined using various kinetic models. The modified Avrami equation showed the 3D crystal growth of PET, which was further evidenced by polarized optical microscopy (POM). The second stage of degradation consumed a higher amount of thermal energy. The experimental results were compared with the literature values.
In situ chemical polymerization of acid fuchsin (AF) dye in the presence of Fe3+ as a complexing and oxidizing agent in the presence of two different textile fibers such as silk and rayon were carried out by varying the experimental conditions in the N2 ambiance. The synthesized polymer systems were subjected to various analytical measurements such as FT‐IR, FES, SEM, TEM, GPC, UV‐visible spectroscopy, cyclic voltammetry, and water contact angle to assess their structure‐property relation. The electrical conductivity values of the AF grafted natural fibers were measured. The rate of grafting (RG) was calculated by using the absorption and emission spectra. The SO2 stretching of AF is seen at 1230 cm−1 in the FT‐IR spectrum. The order of grafting reaction was calculated as 0.99 based on absorbance spectrum, which proved the first‐order reaction with respect to Fe3+ concentration. The binding site and binding constant values were determined. The energy of activation (Ea) for the AF grafted rayon fiber was estimated as 30.72 kJ/mole. A plausible reaction mechanism was proposed based on the obtained experimental results.
A metal and metal oxide quantum dot (QD) was synthesized by a simultaneous oxidative reduction method. Aniline was polymerized both in the presence and absence of o-toluidine (OT) as a co-monomer and in the presence of peroxomonosulfate (PMS) as a free radical initiator in N-methyl pyrrolidone (NMP) medium at 0–5∘C for 3[Formula: see text]h under vigorous stirring condition. The metal or metal oxide bulk powder was used as source material for the generation of QD. At the end of the reaction a dark green colored polymer was formed, filtered and dried at 110∘C for overnight. The dried polymer was subjected to HR-TEM analysis. The size and shape of the crystals formed were noted and compared with the literature reports.
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