Thermal degradation of poly(vinyl butyral) in alumina, mullite and silica composites

Abstract

Thermal degradation of poly(vinyl butyral) (PVB) and its mixtures with alumina, mullite and silica was investigated by non-isothermal thermogravimetry in the temperature range of 323 to 1273 K. The analysis of the data was carried out using a three-dimensional diffusion model. Resuits showed that the kinetic parameters (activation energy and pre-exponentiat factor) of the PVB degradation are different for polymer alone, and ceramic/polymer composites. The overall weighted mean apparent activation energy showed an increasing reactivity in the order of PVB<alumina + PVB<mullite+ PVB<silica + PVB. This shows that the acidic and basic surface charaeteristies of the ceramics promote the thermal degradation of PVB and, the more acidic silica affects the degradation more than mullite and alumina. The effect of pellet compression pressure in the range of 4000 to 8000 psig is also investigated.

Tape Casting Thin, Continuous, Homogenous, and Flexible Tapes of ZrB2

“…Two distinct temperature ranges were observed, where mass loss occurred between 200°C–325°C and 350°C–450°C, after which no further mass loss was observed up to 1000°C. These temperature ranges correspond with reported binder burnout in tapes, PVB, 270°C–340°C and 340°C–400°C. The expected boiling point for plasticizers, DBP and PEG, are 200°C and 250°C, respectively .…”

Determination of Binder Decomposition Kinetics for Specifying Heating Parameters in Binder Burnout Cycles

“…The analysis of TGA weight loss data to extract kinetic parameters has been the subject of several studies and has been examined in detail elsewhere. [21][22][23][24] In this work, we will analyze the TGA data by a number of methods to assess their accuracy in representing the experimental results. One analysis approach to determine the activation energy, E, and pre-exponential factor, A, from TGA data is to assume or establish a model for the decomposition mechanism as a function of conversion and then to use the model with an integral form of the kinetic expression.…”

Synthesis of poly(vinyl butyral)s in homogeneous phase and their thermal properties

“…PVB contains groups which are affected by thermal process, and consequently its physical properties are affected. The thermal degradation of PVB has been studied to analyze its products of decomposition and to obtain kinetic information 11–15. However, little has been reported in the literature concerning the influence of the degree of substitution of alcohol groups by butyral groups on the thermal degradation of PVB.…”