INVESTIGADORES
SARMORIA Claudia
artículos
Título:
Model polydimethylsiloxanes subjected to thermal weathering: effect on molecular weight distributions
Autor/es:
VALLÉS, E M; SARMORIA, C; VILLAR, M; LAZZARI, M; CHIANTORE, O
Revista:
POLYMER DEGRADATION AND STABILITY
Editorial:
Elsevier
Referencias:
Año: 2000 vol. 69 p. 67 - 71
ISSN:
0141-3910
Resumen:
circulating oven. Samples remained for up to 1760 h at 200C under a standard atmosphere. Loss of average molecular weight and broadening of molecular weight distributions was observed. We have modeled the process assuming that both crosslinking and scission are present simultaneously. We have tried to interpret the experimental data in two different ways: either assuming that the ratio of crosslinking to scission was not constant, or that there is an induction period with no reaction before the polymer shows measurable effects of the attack. We discuss the relative merits of both interpretations. C under a standard atmosphere. Loss of average molecular weight and broadening of molecular weight distributions was observed. We have modeled the process assuming that both crosslinking and scission are present simultaneously. We have tried to interpret the experimental data in two different ways: either assuming that the ratio of crosslinking to scission was not constant, or that there is an induction period with no reaction before the polymer shows measurable effects of the attack. We discuss the relative merits of both interpretations.