Mechanosorptive effects in cellophane, polyamide 6 and some other polymers studied by dynamic mechanical analysis

• Published in: Journal of materials science Vol. 32; no. 16; pp. 4227 - 4235
• Main Authors: EBRAHIMZADEH, P. R, KUBAT, J
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 15.08.1997; Springer Nature B.V
• Subjects: Applied sciences; Cellophane; Dynamic mechanical analysis; Exact sciences and technology; Humidity; Materials science; Organic polymers; Physicochemistry of polymers; Polyamide resins; Polyvinyl acetates; Prestressing; Properties and characterization; Relative humidity; Rheology and viscoelasticity; Static loads; Ethylene oxide polymer; Amide 6 polymer; Humidity effect; Vinyl acetate polymer; Dynamic mechanical properties; Polyurethane; Cellulose hydrate; Mechanical loss; Experimental study
• ISSN: 0022-2461; 1573-4803; 1573-4803
• DOI: 10.1023/A:1018643016698

Dynamic mechanical data obtained in the tensile mode with cellophane, polyamide 6, PEO, PVAc and PUR foam (compression) subjected to stepwise humidity changes between 5% and 85% relative humidity are reported. With the exception of PVAc, the loss tangent, tan δ, shows a transient peak every time the relative humidity of the surrounding atmosphere is changed. The strength of the tan δ transients increases when the measuring frequency is lowered. The tan δ transients slowly disappear in response to reduction of the rate of humidity change. High amplitude and prestress with static load reduce the height of the transient peaks. Long-term testing results in relatively small changes in the shape of the loss tangent versus time data. For PA6 a narrowing of the loss tangent peaks with diminishing specimen thickness was observed.