INQUISUR 21779
INSTITUTO DE QUIMICA DEL SUR
Unidad Ejecutora - UE
artículos
Título:
Molecular weight changes induced in an anionic polydimethylsiloxane by
Autor/es:
ANGEL J.SATTI; NOEMÍ A. ANDREUCETTI; ANDRÉS E.CIOLINO; CRISTIANVITALE; CLAUDIA SARMORIA; ENRIQUEM.VALLÉS
Revista:
RADIATION PHYSICS AND CHEMISTRY (OXFORD)
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: OXFORD; Año: 2010 vol. 79 p. 1137 - 1143
ISSN:
0969-806X
Resumen:
An anionic almost monodisperse linear polydimethylsiloxane(PDMS) was subjected to gamma irradiation under vacuum at room temperature.The molecular weight changes induced by the radiation process have been investigated using size exclusion chromatography (SEC) with refractionindex (RI) and multiangle laser light scattering (MALLS) detectors,to obtain the number and weight average molecular weight so ftheirradiatedsamples. The analysisofthedataindicatesthatcrosslinkingreactionspredominatedoverscissionreactions. The resultsobtainedbyanSEC-RIhaveconfirmedthepresenceofsmall,butmeasurableamountsof scission. A previouslydevelopedmathematicalmodeloftheirradiationprocessthataccountsfor simultaneousscissionandcrosslinkingandallowsforboth H- and Y-crosslinks,fittedwellthe measuredmolecularweightdata.Thispredictionisinaccordancewiththeexperimentaldataobtained by 29Si-NuclearMagneticResonancespectroscopy(NMR)andpreviouslyreporteddataforcommercial linear PDMS(Satti etal.,2008). H- and Y-crosslinks,fittedwellthe measuredmolecularweightdata.Thispredictionisinaccordancewiththeexperimentaldataobtained by 29Si-NuclearMagneticResonancespectroscopy(NMR)andpreviouslyreporteddataforcommercial linear PDMS(Satti etal.,2008).
