Effect of macromolecular conformation on the auto-acceleration of oxidation in oriented polypropylene

Autor:	N.Ya. Rapoport, V.B. Miller
Rok vydání:	1976
Předmět:	chemistry.chemical_classification Polypropylene Chemistry Induction period Kinetics General Engineering chemistry.chemical_element Polymer Photochemistry Branching (polymer chemistry) Oxygen chemistry.chemical_compound Polymer chemistry Stress relaxation Macromolecule
Zdroj:	Polymer Science U.S.S.R.. 18:2678-2683
ISSN:	0032-3950
DOI:	10.1016/0032-3950(76)90200-8
Popis:	Transition from equilibrium compact conformations of macromolecular segments in the amorphous phase of isotropic polymers to elongated conformations in oriented samples markedly reduces the yield of hydroperoxide per mole absorbed oxygen in oxidation. Since hydroperoxide is an agent branching kinetics chains of oxidation, a reduction of yield per mole absorbed oxygen reduces auto-acceleration and produces a considerable increase in the induction period of oxidation in the experiment. Chemical stress relaxation in oriented samples during oxidation, which is related to rupture of stressed macromolecules, increases the yield of hydroperoxide to values typical of isotropic samples.
Databáze:	OpenAIRE
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