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- W2113162832 abstract "A series of clean, well-defined polyurethane networks was synthesized from polyester glycols, 2,4-tolylene diisocyanate, and 1,1′,1″-trimethylolpropane by means that afforded precise control over the content of urethane groups per network chain. The thermal cleavage of these networks was studied using the technique of stress relaxation. Analysis of the stress-relaxation data on each network structure revealed two exponential decay processes differing in rate by about an order of magnitude. The rate of the slower process, which dominates the overall stress decay, was shown to be directly dependent on the content of urethane groups per network chain. Positive identification of this process with urethane cleavage was thereby established. The kinetic and thermodynamic constants associated with urethane cleavage were then calculated from data on this process at different temperatures. The more transient stress-decay process was not uniquely definable, but probably originated from the cleavage of one or more types of weak linkages found in small but variable proportions in the different polyurethane networks. The nature and origin of these weak linkages was discussed." @default.
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- W2113162832 date "1966-10-01" @default.
- W2113162832 modified "2023-09-27" @default.
- W2113162832 title "Kinetics of urethane cleavage in crosslinked polyurethanes" @default.
- W2113162832 doi "https://doi.org/10.1002/pol.1966.150041019" @default.
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