Physical chemistry of equilibrium polymerization
Article Abstract:
The equilibrium polymerization of three different systems, namely, actin, sulfur and alpha-methylystyrene is analyzed. The thermodynamic states at which monomer-to-polymer reactions are realized can be observed as second-phase transitions and can be determined by the statistical mechanics of phase transitions. It was observed in all three cases of equilibrium polymerization, that the polymer, once formed, do not return immediately to monomer on retraversing the polymerization line. This tendency, which is known as 'frozen-in polymer state,' may be explained by understanding the microscopic structure of the three systems.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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An investigation of the effect of pyridine derivatives on the oxidative polymerization process of 2,5-dimercapto-1,3,4-thiadiazole and its disulfide dimer
Article Abstract:
The effects of pyridine derivatives 3-chloropyridine and lutidine on the reduction-oxidation reactions of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) and its disulfide dimer were investigated using cyclic voltammetry and ultraviolet-vis spectroscopy. Experimental results showed that the oxidative coupling reactions of DMcT and its disulfide dimer to produce a disulfide-containing polymer are stimulated in the presence of the bases. The importance of these results to the potential application of DMcT/polyaniline composites as a cathode material in secondary lithium batteries was discussed.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Frontal dispersion polymerization
Article Abstract:
The frontal dispersion polymerization was investigated using a saltwater dispersion. Results showed that frontal polymerization through a dispersion that allows preparation of polymers from monacrylates is possible when the density of the polymer is lesser than the density of the aqueous phase. However, hydrolysis followed by intermolecular anhydride formation can occur in the front and produce a cross-linked copolymer in the monomer is an ester.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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