Thermal Degradation Kinetics of ZnO/polyester Nanocomposites

Abstract

ZnO particles were synthetized by the sol–gel method and subsequent heat treatment of 400, 500 and 600 °C was applied. The nano ZnO particles were incorporated to the unsaturated polyester resin by solution blending at 0.05 wt % concentration. X-ray diffraction detected the formation of a wurtzite-like structure. Viscoelastic behavior of neat polyester and nanocomposites revealed the nano ZnO particles does not promote better mechanical properties because of a weak interaction and the glass transition temperature of the polyester was favored by the presence of a higher quantity of nano-size ZnO particles. Thermogravimetric analysis at 5, 10 and 20 °C/min allowed determining the degradation kinetic parameters based on the Friedman and Kissinger models for neat polyester and nanocomposites. Heating rates promoted an increase in the temperature degradation and the addition of ZnO particles promoted a catalyst effect that reduce the amount of thermal energy needed to start the thermal degradation.

Investigating the hydrolytic degradation of PLA/PCL/ZnO nanocomposites by using viscoelastic models

“…This can be attributed to the elasticity reduction of PLA chains due to chain degradation induced by ZnO nanoparticles localized within the PLA phase in accordance with equilibrium thermodynamic prediction. [60] 3.2 | Rheological behavior and modeling of PLA/PCL/ZnO nanocomposites…”

Modification of Glass/Polyester Laminates with Flame Retardants

“…Despite this, compounds containing only tin atoms such as tin oxide SnO 2 are less effective flame retardants than tin-zinc compounds [91]. On the other hand, the addition of zinc oxide ZnO to UPR reduces the activation energy required to start the degradation of material [92]. Between ZnO and ATH, there is a synergism effect.…”

Kinetics and thermodynamics studies on thermal degradation of differently treated starch nanoparticles and estimation of the OH groups and H2O content on particle surface

“…The transition from the micro to nanoscale depends on the characteristics such as the crystal structure, size, which leads to a change in mechanical and thermal properties. 7 Thermal properties of StNPs, mainly the degradation and stability processes are important criteria used in starch nanoparticles-based food industry such as extrusion cooking at high temperature, 8 fat replacers and emulsion stabilizers 9 to know their suitability to process at different high temperatures, and during processing to judge their desirability. 8 Thermogravimetric analysis (TGA) analysis is helpful in order to explain kinetics of thermal decomposition as qualitative information.…”

“…8 Thermogravimetric analysis (TGA) analysis is helpful in order to explain kinetics of thermal decomposition as qualitative information. 7 There are several methods for evaluating kinetic parameters, and model free methods is the most common one. 7 In recent years, several researchers have studied the thermal behavior and decomposition kinetics of starch from rice, wheat, corn, and potato, 10 sugarcane straw, 11 sweet potato starch, 1 corn starch, 12 natural extract of chitosan-starch 13 and ultrasonicated purple taro starch.…”