Anionic polymerization of a series of cyclocarbosiloxanes

<p>"A study has been made on the anionic polymerization of a series of cyclocarbosiloxanes of the type: [IMAGE] where n was varied from 2 to 8. The polymerization reaction in benzene, was initiated using cesium trihexyl silanolate, a unique organic soluble liquid catalysts. Benzene served as both a solvent and to shift the position of the NMR SiCH₃ polymer peak away from the monomer peak making it feasible to follow the kinetics on a Varian EM-360 Nuclear Magnetic Resonance Spectrometer. Hexamethylphosphoramide (HMPA) was used as a promoter to solvate the initiator ions and thus increasing the polymerization rate. It was found that water present in the system decreased the polymerization rate and brought about a decrease in the molecular weight of the polymer. The polymerization rate was found to vary with the one-half power of initiator concentration, while molecular weight dropped with increasing initiator concentration. The effect of temperature was to increase the rate of polymerization. The activation energies were found to be approximately 10 kcal/mole for all of the systems studied "--Abstract, pages ii-iii.</p>

Name thesis:degree_name

Ph. D. in Chemical Engineering

Grantor

University of Missouri--Rolla

Year dc:date.available

2016

Author dc:creator

• Knickmeyer, William W.

• Chemical Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/283

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-1285