Kinetic studies of the degradation of poly(vinyl alcohol)-based proton-conducting membranes at low temperatures

High Shear Homogenization of Lignin to Nanolignin and Thermal Stability of Nanolignin‐Polyvinyl Alcohol Blends

“…The weight loss also increased from 390 to 470 8C, a temperature range in which PVA forms polyene structures and further degradation continues by chain scission and formation of compounds of low molecular weight. [33] The total weight loss at 470 8C was 88 % for PVA, whereas that of KL0h and KL4h were 54 % and 46 %, respectively. Figure 9 shows the thermal stability of a nanolignin (KL4h)/PVA blend compared to mechanically untreated kraft lignin (KL0h)/PVA composites.…”

Investigation of Thermal Behaviors of Poly(3-Chloro-2-Hydroxypropyl Methacrylate) modified with Amine-Rich Groups

“…The Ozawa method is used to calculate the nonisothermal data [11,21,30]. The plot of log β against 1 T -1 under given value E a is: Using the Friedman method, the activation energy (E a ) constant heating rate for each α, in the plot of ln [β (T max 2 ) -1 ] versus 1 T max -1 the slope gives -E R -1 [19,22,27,34,35]…”

“…S olid-state phase chemistry attracted a great deal attention in the fields of chemistry, pharmacology, environmental and mining sciences in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13]. Solid-state kinetic reactions have always drawn great attention and are seen as challenging issues in chemical researches [1][2][3][4][5][6]14,15].…”

“…Solid-state kinetic reactions have always drawn great attention and are seen as challenging issues in chemical researches [1][2][3][4][5][6]14,15]. These reactions can mechanistically be classified according to the diffusion [7,8,16], geometrical contraction [8,16], nucleation and reaction order models [1][2][3]10,11,17]. Empirically, on the other hand, these reactions are verified either isothermally or non-isothermally.…”

“…A lot of kinetics-related data can be obtained from the thermogravimetric data, like the activation energy and exponential factor. In the course of the kinetic analysis, the kinetic parameters could be determined by some mathematical approaches, like the Kissinger-Akahira Sunose (KAS) [15], Flynn-Wall-Ozawa (FWO) [12], Coats-Redfern [6,12], Ozawa [11,19] and Friedman [11] methods. Coats-Redfern kinetic method uses the integral form of the non-isothermal rate law.…”