Measurement of brittleness temperature of neoprene by proton magnetic resonance: Effect of plasticizers

摘要

AbstractProton magnetic resonance (PMR) line widths, δH, have been determined as a function of temperature for a number of neoprene (polychloroprene) samples. The measurements were made on raw neoprenes (type W, WRT, and GNA) and on neoprenes with plasticizers in both the unvulcanized and vulcanized states. An excellent correlation of the temperature of line narrowing with brittleness temperature found by mechanical tests is reported. The results indicate that PMR may be of value in studying plasticizer properties and in measuring glass temperatures in a manner dependent only on molecular motions rather than on the nature of a mechanical test or on sample statistics