Experimental data on the solubility of CO2 in methyl methacrylate (MMA) and butyl methacrylate (BMA) are reported at temperatures from 308 to 333 K and pressures in the range of 1 to 10 MPa. The corresponding measurements of the volumetric expansion of the liquid phase are also presented. The solubility data are correlated with the Peng-Robinson equation of state using two interaction parameters. Solubilities of CO2 as high as 80 mol% can be attained in both monomers in the range of pressure considered. A near-linear relationship is observed between pressure and liquid-phase composition. The Peng-Robinson equation of state provides a satisfactory correlation of the solubility data. The average absolute relative deviations with respect to the calculated values of pressure are less than 2%. For a given monomer, the expansion isotherms coincide when plotted as a function of the liquid - phase composition. Catalytic chain transfer (CCT) polymerisation of CO2-expanded MMA, BMA and styrene is then described. Experimental values of the chain transfer constant are determined at 323 K and 333 K and in the range of pressure from 0.1 to 6 MPa. A cobaloxime complex is used as the chain transfer catalyst. The effect of small quantities of polymer on the volumetric expansion of the corresponding monomer is considered. The chain transfer constants for the expanded monomers are significantly higher than those obtained in the bulk monomers. It is demonstrated that a linear relationship exists between the chain transfer rate coefficient and the inverse of liquid-phase viscosity. These results provide significant evidence that the rate-determining step in the CCT process is diffusion-controlled. Finally, molecular weight evolution in CCT polymerization of CO2-expanded MMA is reported. Experimental molecular weight and polydispersity index data are presented at 323 K in the range of conversion from 1 to 25%, and at pressures of 5 and 6 MPa. Both molecular weight and polydispersity increase with conversion at conditions below the homogeneous expansion limit. Predici simulations suggest that either irreversible catalyst deactivation or cobalt-carbon bond formation is the most likely mechanism for the increase in molecular weight with conversion.

Thesis (M.A.)--Georgia Southern University, 2007. / "A thesis submitted to the Graduate Faculty of Georgia Southern University in partial fulfillment of the requirements for the degree Master of Art." In English, under the direction of Douglass Thompson. ETD. Electronic version approved: December 2007. Includes bibliographical references (p. 82-85)

Thesis (M.A.)--Villanova University, 2007. / English Dept. Includes bibliographical references.

Thesis (B. Ec.(Hons))--University of Adelaide, 1980. / Cover title. Includes bibliographical references (leaves 81-86).

Issued also as Thesis (Ph. D.)--Columbia University. / "350 copies of this first edition have been printed from type, of which 300 are for sale." This copy not numbered.

Issued also as Thesis (Ph. D.) Columbia University. / "350 copies of this first edition have been printed from type, of which 300 are for sale." This copy not numbered.

Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 121-128).

No description available.

Diss.--Konstanz--Universität Konstanz, 1990. / Bibliogr. p. 208-222.

Orientador: Tamás Szmrecsányi / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Economia / Made available in DSpace on 2018-08-21T14:17:07Z (GMT). No. of bitstreams: 1 Heller_Claudia_D.pdf: 17542809 bytes, checksum: dc3715c9b871c033e6dac0063c8e2950 (MD5) Previous issue date: 1996 / Doutorado / Doutor em Economia