Authors:Endang W. Bachtiar, Lisa Rinanda Amir, Pradono Suhardi, and Basril Abas
natural polymer from renewable resources, obtained from shell of shellfish, and a waste product of the seafood industry. It has a good biocompatibility property and degradable by enzymes to become oligosaccharide that can be easily absorbed. It forms an
detected active ingredient. EAVPT Congress, Budapest, Abstracts, p. 291.
Somlyay, I., Hidasi, Gy. and Várnagy, L. (1989): Degradation of Nevifosz 50 EC in pheasant embryos (in Hungarian). IVth Vet. Tox. Conf., Kaposvár. Summaries
Iron polymethacrylate was synthesized by free radical solution polymerization of methacrylic acid, followed by replacement of the carboxylic proton with iron. Thermal volatilization analysis and thermogravimetry were used to study its thermal stability from ambient temperature up to 500oC. The results reveal that ferric oxide is left as residue at the end of the thermal degradation experiments.
The process of thermal degradation of poly(vinyl chloride)/poly(methyl methacrylate-butadiene-styrene) (PVC/MBS) blends was
investigated by means of isothermal thermogravimetry in nitrogen. The total mass loss was determined after 120 min. The kinetic
parameters of the degradation process were determined by applying two kinetic models: the model which assumes autocatalytic
degradation (Prout-Tompkins) and the model of two-dimensional diffusion. It was established that the thermal degradation at
lower degrees of conversion (α<0.20) was well described by the former model, but the latter model was applicable at higher
degrees of conversion. The thermal stability of blends at a certain temperature of isothermal degradation depends on the blend
composition and the shell/core ratio in MBS, and on the adhesion in the boundary layer in PVC/MBS blends.
of conducting polymers based on m-nitroaniline, m-chloroaniline and m-aminophenol
by aniline initiated ammonium peroxydisulfate oxidation, has been attempted.
The IR spectra of the polymers have been studied. Thermogravimetric analysis
of the conducting polymers has been followed using a computer analysis method
LOTUS PACKAGE, developed by us for assigning the degradation mechanism. A
number of equations have been used to evaluate the kinetic parameters. The
mechanism of degradation of the conducting polymers has been explained on
the basis of their kinetic parameters.
Authors:C. Tian, Z. Shi, H. Zhang, J. Xu, J. Shi, and H. Guo
The thermal degradation of cotton cellulose treated with chemical mixtures containing P and N was studied by thermal analysis,
infrared spectroscopy, Char yield and limiting-oxygen-index (LOI). Our experiments demonstrated the following facts. The temperatures
and activation energies of pyrolysis were lower for cotton cellulose treated with flame retardants than those for untreated
samples and the values of Char yield and LOI were greater for treated cotton than those for untreated one.
A novel PMR polyimides (TMBZ-15) based on substituted benzidines is examined and compared to state-of-the-art PMR-15. The
mechanism for the thermal decomposition of two specific PMR polyimides is obtained using TG/FTIR/MS techniques. In order to
verify the pathway of polyimide degradation, a pyrolysis/GC-MS technique was employed to evaluate the organic degradation
products, particularly the larger components that are destroyed in traditional TG/MS. A proposed degradation mechanism involves
two main stages of decomposition, each of which produce a variety of products. The first group includes aromatic hydrocarbons,
aromatic amines and nitriles, which correspond to partial fragments of polymer chains. The second group consists largely of
fluorene, naphthalene and phenanthrene, which are attributed to the isomerization, rearrangements and cyclizations of the
aforementioned pyrolyzates at high temperature.
Authors:A. Jiménez, A. Iannoni, L. Torre, and J. Kenny
Thermogravimetric analysis (TG) was used in this work to study the degradation kinetics of industrial PVC plastisols. In order
to model the pyrolitic degradation of plastisols in nitrogen, a kinetic model based on phenomenological considerations was
developed. Two different processes were observed during the first degradation stage. The model parameters, such as activation
energies and pseudo orders of reaction, were calculated using a non-linear regression analysis. The model developed was able
to describe the degradation behaviour both in isothermal and in dynamic modes. The results of such analysis were applied to
obtain long-term data from short-term experiments as an engineering approach to evaluate the thermal resistance of plastisols.