Novel technique for following the rigidity changes accompanying the curing of polymers

✍ Scribed by Armand F. Lewis; John K. Gillham

• Book ID: 101581074
• Publisher: John Wiley and Sons
• Year: 1962
• Tongue: English
• Weight: 266 KB
• Volume: 6
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1962.070062205

✦ Synopsis

Abstract

A method is described for measuring the rigidity of a curing polymer system throughout its complete course of reaction (liquid to solid). In this technique, a braided fiber (nylon), impregnated with the polymer system to be studied, is used as the supporting member for a free, torsionally vibrating mass. From the frequency of the vibration, the apparent rigidity modulus Ḡ of the impregnated braid is calculated. The rigidity of the reacting polymer is thus followed nondestructively during the curing period. In a further development, the term relative rigidity Ḡ/Ḡ~0~ is introduced to normalize the rigidity parameter to a more experimentally adaptable quantity. The curing behavior of several types of polymer is presented to illustrate the general utility of the method.