Molecular weight dependence of domain structure in silica-siloxane molecular composites
A detailed investigation of the molecular weight dependence of silica growth in in situ filled polydimethylsiloxane/tetraethylorthosilicate (PDMS/TEOS) materials was conducted using small angle neutron scattering (SANS). Composite materials were produced by using TEOS to simultaneously produce the glassy filler phase and to crosslink linear, hydroxyl terminated PDMS of variable molecular weight, M. Correlated domains of glassy filler were produced. The morphology of the in situ filled material showed a definite dependence on the molecular weight of the precursor polymer. The scale, R, of the glassy domains follows de Gennes' description of phase separation in a crosslinked system (R {alpha} M{sup 1/2}).
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5330100
- Report Number(s):
- SAND-91-2539C; CONF-920402--20; ON: DE92015046
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPOSITE MATERIALS
CROSS-LINKING
DIFFRACTION
MATERIALS
MOLECULAR WEIGHT
NEUTRON DIFFRACTION
NMR SPECTRA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
POLYMERIZATION
SCATTERING
SILICA
SILOXANES
SMALL ANGLE SCATTERING
SPECTRA
SYNTHESIS