Viscoelastic properties of regenerated cellulose sheet

✍ Scribed by Eric Wellisch; Leon Marker; Orville J. Sweeting

• Publisher: John Wiley and Sons
• Year: 1961
• Tongue: English
• Weight: 631 KB
• Volume: 5
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1961.070051806

✦ Synopsis

Abstract

The viscoelastic properties of regenerated cellulose containing several different softeners or water only were investigated. Measurements of creep and Young's modulus were made on the Instron tensile tester, and the creep curves were fitted to a mechanical model consisting of Voigt and Maxwell elements of springs and dashpots in series. The elastic and viscous parameters were determined for the various softened films and compared with each other and with measurements of Young's modulus. It was found that the elastic modulus is a function of the effective molar concentration of the softener in the film which is related to its ability to break hydrogen bonds. The inelastic deformation was found to be a linear function of the heat of vaporization of softener (including water) in the film which is related to hydrogen‐bonding energy. Thus, inelastic deformation requires breaking of interchain hydrogen bonds in contrast to pure elastic deformation which involves stretching of hydrogen bonds. A relationship of the Voigt unit and of the Maxwell unit on the composition of the cellulose‐softener system and on cellulose‐softener interaction has been demonstrated.