Studies on the thermal stability and degradation kinetics of Pd/PC nanocomposites

Abstract

Effect of heating rate, Pd content, and synthesis method on the thermal stability of the ex situ and in situ Palladium/polycarbonate (Pd/PC) nanocomposites was investigated. TEM images revealed discrete Pd nanoclusters of about 5 and 15 nm sizes for 1 and 2 vol % ex situ nanocomposites, respectively. However, agglomerated Pd nanoclusters were noticed in the in situ samples, irrespective of the Pd content. The ex situ Pd/PC nanocomposites showed high onset temperature (Ti) for thermal degradation of PC than the in situ and pure PC samples. Pd content and heating rates were found to have a positive influence on the Ti and Tm (temperature at the maximum degradation rate occurs) of the Pd/PC nanocomposites. Thermal degradation of the PC was found to follow the first-order kinetics in the Pd/PC nanocomposites. The activation energies associated with the degradation were determined by using the Kissinger method. These activation energies are used to construct the Master decomposition curve (MDC) and weight-time-temperature (a-t-T) plots that describe the time-temperature dependence of the PC pyrolysis in the Pd/ PC nanocomposites. These constructed a-t-T plots were validated with the data from isothermal measurements.

Improving properties of ceramic silicone rubber composites using high vinyl silicone oil

“…% of the initial weight as shown in Table , which mainly be composed of MgO, ZrO 2 , SiO 2 , and siliconoxycarbide (SiOxCy, x < 2, y > 0). It can be seen that the silicone rubbers decomposed with the increase in temperature, while the initial degradation temperature was improved by the addition of HVSO …”

“…It can be seen that the silicone rubbers decomposed with the increase in temperature, while the initial degradation temperature was improved by the addition of HVSO. 30 The DTG results of the silicone rubber composites from 350 C to 650 C in nitrogen are shown in Figure 6b. In the temperature range between 400 C and 600 C, the decomposition of silicone rubber took place quickly.…”

Influences of Injection Conditions on Strength Properties of Recycled and Virgin PBT/PC/ABS

“…4. The temperature at which the maximum rate of weight loss appeared via DTG figures [20]. In Experiment 3, the maximum rate of weight loss temperature for virgin and recycled blends was 423.3 C. In Experiment 6, these temperatures were 422.7 and 419.3 C for virgin and recycled samples, respectively.…”

Pyrolysis Kinetics of PA66/CB

“…Where α is the extent of conversion which can be represented mathematically by Eq.2 [6,7,8]. K(T) is the rate constant and f(α) is the reaction model which is an algebraic expression of the kinetic model as function of α [9].…”

“…Where W 0 is the initial mass of the specimen, W t is the weight of the sample at a particular time or temperature while W f is the final mass of the specimen [7,8].…”