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Your search keyword '"Doina Dimonie"' showing total 2 results
Start Over Author "Doina Dimonie" Journal polymer degradation and stability
2 results on '"Doina Dimonie"'

1. Nature of the first exothermic peak on the DSC curve of linear polydicyclopentadiene obtained with a special catalytic system

Author

Doina Dimonie, M.J. Abadie, Valentin Munteanu, Mihai Dimonie, J. Couve, and H. Iovu

Subjects
Exothermic reaction, chemistry.chemical_classification, Materials science, Polymers and Plastics, Exothermic process, Thermodynamics, Polymer, Condensed Matter Physics, Endothermic process, Ring-opening polymerization, chemistry, Polymerization, Mechanics of Materials, Polymer chemistry, Materials Chemistry, Polydicyclopentadiene, Glass transition
Abstract

A DSC and TGA study of linear polydicyclopentadiene (L-PDCPD) shows that the thermal behaviour of this polymer is characterized by an endothermic and two exothermic processes. In previous work it was demonstrated that the endothermic process is a glass transition and the second exotherm represents the thermo-oxidation of the polymer. In this work the first exothermic process is shown to be a possible thermal polymerization of the double bonds in the polymer chains.

Published
2000
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2. Some aspects of the thermal stability of linear polydicyclopentadiene (L-PDCPD)

Author

Mihai Dimonie, Stela Stoica, Valentin Munteanu, Doina Dimonie, and M.J. Abadie

Subjects
chemistry.chemical_classification, Polymers and Plastics, chemistry.chemical_element, Polymer, Tungsten, Condensed Matter Physics, Branching (polymer chemistry), chemistry, Chemical engineering, Polymerization, Mechanics of Materials, Thermal, Polymer chemistry, Materials Chemistry, Thermal stability, Irradiation, Polydicyclopentadiene
Abstract

L-PDCPD, obtained with catalysts based on a tungsten complex and allylsilanes has good thermal stability. TGA measurements, in air, show that the first weight losses begin around 350°C. The influence of cocatalyst, macromolecular chain defects, and fast electrons irradiation on the thermal stability of L-PDCPD is presented. The thermal stability of L-PDCPD depends to a certain extent on the type of cocatalysts used in polymerization. Branching of L-PDCPD significantly decreases the thermal stability of polymer. Irradiation with small doses of fast electrons does not essentially affect the thermal behaviour of L-PDCPD.

Published
2000
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