Abstract
The thermal stability and the kinetics of thermal decomposition of statistical copolymers of N-vinylpyrrolidone (NVP) with the alkyl methacrylates, hexyl methacrylate (HMA) and stearyl methacrylate (SMA), were studied by Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG). Statistical copolymers of different compositions were studied, and their thermal decomposition behavior was compared to the corresponding homopolymers. The activation energies of the thermal decomposition were calculated using the Ozawa-Flynn-Wall, the Kissinger, and the Kissinger-Akahira-Sunose methodologies. The effects of the nature of the methacrylate monomer, the copolymer composition, and the rate of heating are discussed.
Highlights
E reactivity ratios were calculated using several methodologies along with structural characteristics of the copolymer chain. e thermal properties of the copolymers were studied by Differential Scanning Calorimetry (DSC), ermogravimetric Analysis (TGA), and Differential ermogravimetry (DTG) and were compared to those obtained from the corresponding homopolymers
Statistical Copolymers of NVP and hexyl methacrylate (HMA) or stearyl methacrylate (SMA) via Reversible Addition-Fragmentation chain Transfer (RAFT). e RAFT copolymerization of NVP and HMA was conducted in bulk, for 35 min, at 60°C and with SMA in THF, for 3 hours, using AIBN as initiator and [1-(O-ethylxanthyl)ethyl]benzene as the chain transfer agent (CTA) (Scheme 1)
Several copolymers with different feed compositions were prepared. eir molecular characteristics are given in Table 1. e molecular weights and polydispersity were measured by size exclusion chromatography (SEC) in CHCl3 as the carrier solvent, while the copolymer composition was measured by 1H-NMR
Summary
Statistical copolymers of N-vinylpyrrolidone (NVP) with the alkyl methacrylates, hexyl methacrylate (HMA) and stearyl methacrylate (SMA), were used. Erefore, it can find applications in several industrial sectors, such as cosmetics and pharmaceuticals It is a nonionic, amorphous polymer, with the characteristic feature that it does not show a lower critical solution temperature behavior in aqueous solutions. Erefore, it is imperative to study their thermal properties to find the suitable range of temperatures for possible applications [48, 49] Towards this direction, thermal analysis methods are extremely valuable tools to provide information regarding the thermal transitions, the thermal stability, and the thermal decomposition of novel polymeric materials. E present study is focused on the thermal stability and the kinetics of the thermal decomposition of statistical copolymers of NVP with HMA and SMA. E thermal stability of the copolymers was studied by ermogravimetric Analysis (TGA) employing a Q50 TGA model from TA Instruments. e samples were placed in a platinum pan and heated from ambient temperatures to 600°C in a 60 mL/min flow of nitrogen at heating rates of 3, 5, 7, 10, 15, and 20°C/min
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