Date of Award
Master of Science in Engineering Science- (M.S.)
Chemical Engineering and Chemistry
David S. Kristol
Richard Clyde Parker
George Y. Lei
The objective of this thesis has been divided in two parts.
The first part is subdivided into two areas. First a "Universal" calibration curve for gel permeation chromatography (GPC) was construc-ted using different molecular weight standards of PMMA and MMA-HEMA co-polymers. By measuring the viscosity of the different molecular weight solutions and calculating the Vr, (retention volume), from GPC data, plots of In [ η ] Mw against Vr and In Mw against Vr are obtained. These curves can be used to obtain the molecular weight of any linear (not crosslinked) copolymer by simple measurements of viscosity and GPC data.
The second subdivision is the characterization of the forward polymer of TDI-HEMA blocked by p-cresol prepared using the heterogeneous method. The molecular weight was obtained from Light Scattering, Vapor-Pressure Osmometry and viscosity-GPC data, using the "Universal" calibration curve obtained in the first part. Comparing the molecular weights thus obtained with the molecular weights calculated using the homogeneous preparation method shows that the amount of gel formation has been dramatically reduced.
The second part of this work relates to the characterization of the oligomeric material which resulted from the reaction of dichloroacetylcholride and (C2 H5 )3 N. The reason for characterizing the polymeric substance was the possibility that the resulting material would have the structure --( CCl2- CO )n--, which may be hydrolyzed to obtain a polycarbonyl compound. This could be acomplished if the polymerization took effect through the carbon-carbon double bond.
Montero, Manuel, "Characterization of TDI-HEMA homopolymer prepared via an immiscible solvent system. Synthesis and investigation of oligodichloroketene" (1984). Theses. 2246.