title: H2O outgassing from silica-filled polysiloxane TR55.
abstract: Temperature-programmed desorption/decomposition (TPD) was employed to obtain the moisture content and outgassing kinetics of TR55, a silica-filled cross-linked polysiloxane. The total moisture content of TR55 in the as-received state and after 20-30 min of vacuum pumping in the load-lock prior to TPD was measured to be on the order of 0.35 wt%. Physisorbed H(2)O and chemisorbed H(2)O account for about 13.2 and 86.8%, respectively, of the 0.35 wt% measured moisture content. H(2)O outgassing models based on the kinetics measured from TPD experiments suggest that loosely bound chemisorbed water outgasses in a dry environment slowly but continuously over many decades at or a little above room temperature. However, physisorbed water can be easily pumped out in a matter of hours at around 400 K.
authors.affiliation: Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA. dihn1@llnl.gov
authors.forename: L N
authors.initials: LN
authors.lastname: Dinh
authors.forename: M A
authors.initials: MA
authors.lastname: Schildbach
authors.forename: R S
authors.initials: RS
authors.lastname: Maxwell
authors.forename: W J
authors.initials: WJ
authors.lastname: Siekhaus
authors.forename: B
authors.initials: B
authors.lastname: Balazs
authors.forename: W
authors.initials: W
authors.lastname: McLean