Neutron reflection studies of swelling of chemically end-grafted polymer chains
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
- Exxon Research and Engineering Co., Annandale, NJ (United States)
Neutron reflection is used to compare the swelling of two chemically end-grafted polystyrene brushes having different grafting densities exposed to a theta solvent cyclohexane and to a good solvent toluene. The relative swelling of the brushes with a variation of solvent quality becomes smaller and the temperature dependence becomes weaker with an increase of grafting density. This type of swelling is very similar to polymer networks where an increase of cross-linking density leads to a decreased range of swelling and diminished dependence of the swelling. The model density profile fits to the body of both brushes is parabolic in a good solvent so that some fluctuation effects, as found generally in lower density brushes, are obtained as the brush expands.
- OSTI ID:
- 225263
- Report Number(s):
- CONF-941144--; ISBN 1-55899-278-2
- Country of Publication:
- United States
- Language:
- English
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