Effect of plasticizers on the viscoelastic properties of poly(vinyl chloride)

✍ Scribed by N. Hata; A. V. Tobolsky; A. Bondi

• Publisher: John Wiley and Sons
• Year: 1968
• Tongue: English
• Weight: 652 KB
• Volume: 12
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1968.070121203

✦ Synopsis

Stress relaxation modulus data, E,(t), have been determined between -70 and + 170°C on blends of three samples of poly(viny1 chloride) of different molecular weights with di-2-ethylhexyl adipate, di-2-ethylhexyl phthalate, epoxidiaed soybean oil, and a poly(propy1 adipate), respectively. The relaxation modulus-time-temperature data could be combined into master curves. However, probably owing to the finite contribntions of the crystalline phase to the elastic properties, time-temperature superposition is here just marginally valid, and the master curves are only crnde, yet still useful approximations. Combination of the present data with the accumnlated published information suggests that the viscoelastic properties of plasticized poly(viny1 chloride) are determined primarily by the glass transition temperature of the plasticizer, the compatibility of polymer and plasticizer, and probably also by the crystallites (as crosslinks). The exact role of the crystallites will remain elusive until the advent of pla\ticized poly(viny1 chloride) with controlled crystallinity.