H2O outgassing from silica-filled polysiloxane TR55

Dinh, L. N.; Schildbach, M. A.; Maxwell, Robert S.; Siekhaus, Wigbert J.; Balazs, B; McLean, W.

doi:10.1016/j.jcis.2003.12.052

Cited by 14 publications

(27 citation statements)

References 10 publications

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“…This value compares well with that obtained for water in silica at around −31 kJ/mol [30]. The activation energy for desorption is calculated at 62 kJ/mol which is a value between the energy of desorption for physisorbed water in fumed silica obtained by Feng et al [30] (69 kJ/mol) and Dinh et al [36] (58 kJ/mol). Additionally, the value obtained in this investigation is slightly less than the range 69-81 kJ/mol proposed in a review article by Zhuralev [19].…”

Section: Application Of the Model To Water Adsorption In Diatomaceoussupporting

confidence: 86%

Water sorption in silicone foam containing diatomaceous earth

Rutherford

Coons

2007

Journal of Colloid and Interface Science

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Section: Application Of the Model To Water Adsorption In Diatomaceoussupporting

confidence: 86%

Water sorption in silicone foam containing diatomaceous earth

Rutherford

Coons

2007

Journal of Colloid and Interface Science

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“…In addition, moisture outgassing may result in degradation of interfacial polymer structures, lead to material incompatibility in the system, and compromise the mechanical properties of composite materials. 1,16,17 Prior work has shown that the interaction of a silica filler surface and water dominate the sorption and outgassing processes 1,18 wherein the thermal and chemical history of the filler is directly associated with the activation energy barrier of water release. 1 We have recently developed a suite of 3D-printed siloxanes (LL50) wherein the reinforcing filler is a hydrophobically treated fumed silica, which can significantly lower the moisture content and subsequent outgassing from elastomers after compounding and cure in comparison with traditional siloxane rubbers.…”

Section: Introductionmentioning

confidence: 99%

“…Comparison among these siloxanes confirms that a functionalized fumed silica surface mitigates moisture uptake and subsequent outgassing in dry/vacuum applications, when compared with previously reported siloxane rubbers. 1,16,18,22 RESULTS AND DISCUSSION Moisture outgassing from compression molded LL50 Compression molded non-porous siloxane rubber (LL50) samples were subjected to TPD experiments and signals were analyzed to extract kinetic parameters. Long term outgassing projections were then performed.…”

Section: Introductionmentioning

confidence: 99%

Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers

et al. 2019

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The outgassing kinetics from siloxane elastomers is dominated by moisture desorption from the reinforcing silica filler and can be detrimental in moisture-sensitive applications. In this study, a custom 3D printable siloxane rubber (LL50) was analyzed in three different states: after a high temperature vacuum heat treatment, limited re-exposure to moisture after vacuum heat treatment, and in the as-received condition. The outgassing kinetics were extracted using isoconversional and iterative regression analyses. Moisture release by physisorbed and chemisorbed water from the samples have activation energies in the range of 50 kJ/mol (physisorbed type) to 220 kJ/mol (chemisorbed type). Overall, moisture outgassing from LL50 was 10 times lower than that from traditionally prepared siloxane rubbers. The vastly diminished moisture content in LL50 is attributed to the existence of a finite low level of silanol groups that remain on the fumed silica surface even after hydrophobic treatment.

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“…Dinh et al have used temperature programmed desorption to develop models of water outgassing from the surface of silica fillers through a silicone matrix [12]. This showed that such materials exhibit long-term moisture outgassing even in mild thermal ageing conditions (as low as 40 C).…”

Section: Force Decay Profilesmentioning

confidence: 99%