Dynamic mechanical relaxation effects in some poly(arylene sulfones)

✍ Scribed by Kurz, James E. ;Woodbrey, James C. ;Ohta, Masao

• Book ID: 104535556
• Publisher: Wiley (John Wiley & Sons)
• Year: 1970
• Tongue: English
• Weight: 378 KB
• Volume: 8
• Category: Article
• ISSN: 0449-2978
• DOI: 10.1002/pol.1970.160080711

✦ Synopsis

Abstract

Poly‐4,4′‐oxydiphenylenesulfonyl and poly‐4,4′‐methylenediphenylenesulfonyl were synthesized by an electrophilic substitution polymerization of the arylene monosulfonyl chloride monomers. The glass‐transition temperatures T~g~ of these polymers were determined by calorimetric and dynamic mechanical measurements, and the number‐average molecular weights were determined by vapor‐pressure osmometry. Both polymers were found to have the same T~g~ at equivalent molecular weight; the limiting value at high molecular weight is 238°C. Both polymers have two dynamic mechanical relaxation peaks at temperatures far below T~g~. One is in the neighborhood of 0°C, and the other is at −110°C. Plausible origins for these relaxations, and the absence of any near 0°C in poly(4,4′‐isopropylidenediphenylene‐co‐4,4′‐sulfonyldiphenylene dioxide), are discussed.