Thermodynamic functions of linear high polymers: Part I—polyoxymethylene

The effect of alkyl substitution on the thermodynamic stability and kinetic reactivity of α-anions of metal—carbene complexes

Owing to the fact that sulfur can exist in different oxidation states and that in each oxidation state it can form different functions, there exist many different sulfur-containing chemical functions with a widespread array of chemical and physical properties. Consequently, sulfur-containing polymers vary from highly reactive to chemically inert substances; they can have high softening points or be viscous oils, be thermally stable or not. Some of these polymers have found commercial applications, others are of academic interest.

Sulfur-containing polymers

Studies in surface chemistry of carbon blacks part III. Interaction of carbon blacks and aqueous bromine

We synthesized the thermally stable alternating copolymers from various acyclic and cyclic alkyl-substituted 1,3-diene monomers with sulfur dioxide (SO2) as the starting comonomers by radical copolymerization and subsequent hydrogenation. It was revealed based on the DFT calculation results using model reactions as well as the thermodynamic analysis of polymerization that some propagation steps were reversible and the highly 1,4-regiospecific sequences of the poly(diene sulfone)s (PDSs) were consequently produced via a free radical propagation mechanism. The stereochemical structures of the PDSs obtained from cyclic 1,3-diene monomers, such as 1,3-cyclopentadiene and 1,3-cyclohexadiene, were also estimated based on the DFT calculations. Transparent films with a refractive index of 1.53–1.55 were readily obtained by casting the PDS solutions, being confirmed to be amorphous by wide-angle X-ray diffraction measurements. The decomposition of the PDSs started below 150 °C, but hydrogenation produced thermally...

Thermally Stable Polysulfones Obtained by Regiospecific Radical Copolymerization of Various Acyclic and Cyclic 1,3-Diene Monomers with Sulfur Dioxide and Subsequent Hydrogenation

A 26·9° C isothermal calorimeter and its application to the measurement of some heats of copolymerization of sulphur dioxide with olefines, and the reassessement of the kinetic data on the butene-2 systems

F. S. Dainton

Papers

A 26·9° C isothermal calorimeter and its application to the measurement of some heats of copolymerization of sulphur dioxide with olefines, and the reassessement of the kinetic data on the butene-2 systems

The copolymerization of sulphur dioxide and 1-hexadecene in chloroform solution