Study of the thermal degradation of poly(furfuryl methacrylate) by thermogravimetry

Influence of chain microstructure on thermodegradative behavior of furfuryl methacrylate‐N‐vinylpyrrolidone random copolymers by thermogravimetry

“…In fact, we have reported that the analysis of products of poly-F partially degraded indicate the formation of cyclic structures of 2,4-dimethylglutaric anhydride along the polymeric chains as indicated in Scheme I. 3 This means that if this mechanism holds in the case of copolymers, the presence of two consecutive units ( a diad FF) is necessary for the formation of one cycle of 2,4-dimethyl glutaric anhydride in the main chain. The probability that sequences of F participate in the formation of such anhydride structures increases with increased av- erage molar fraction of F in the copolymer chains, which in turn is favoured according to the values of the reactivity ratios mentioned for this copolymerization system.…”

“…The value of E, obtained for the homopolymer poly-F agrees reasonably well with the results obtained by the application of the method suggested by Ozawa, l4 which gave a value of E, = 163 kJ/mol for the first step of the thermal degradation process of poly-F in the same experimental conditions used in this work. 3 The data quoted in the second column of Table 11, makes clear that E, decreases with increasing mF. Moreover, Figure 3 shows the diagram of the variation of E, with the molar fraction of diad sequences of F m F F , giving a straight line that demonstrates that there is a direct influence not only of the average composition of copolymer samples, but also of the distribution of monomeric units along the copolymer chains, reflecting the importance of the microstructure in determining the response of a copolymer system when subjected to a thermodegradative process.…”

Drug permeability and mucoadhesion properties of thiolated trimethyl chitosan nanoparticles in oral insulin delivery

“…S3), the first stage of weight loss from 10 to 100 C was attributed to the loss of adsorbed and bound water and the second stage from 180 to 360 C was assigned to dehydration of the saccharide rings, depolymerization and decomposition of the acetylated and deacetylated units of the polymer [19]. Within the second stage, the sequence of decomposition temperature was chitosan>TMC>TMC-Cys, and the sequence of weight loss velocity was TMC-Cys>TMC>chitosan.…”

Kinetic of thermal degradation of poly(isobornyl methacrylate)

“…Thermogravimetry is widely used as a method to investigate the thermal degradation of polymers and to determine the kinetic parameters such as activation energy, pre-exponential factor, and reaction order. Many studies have been carried out on thermal stability of methacrylate polymers containing various ester residues [1][2][3][4][5]. The thermal stability and degradation depend on the composition [6][7][8].…”