Polymer-solvent interaction observed in rubbery plateau modulus

✍ Scribed by Nakajima, N.; Varkey, J. P.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 201 KB
• Volume: 46
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199808)46:4<298::aid-pi19>3.0.co;2-q

✦ Synopsis

The conventional wisdom is that concentration dependence of the rubbery plateau modulus of polymer solutions is independent of the material. However, in industrial practice, sometimes a small addition of miscible liquid lowers the modulus signiÐcantly whilst at other times it hardly a †ects it. This work examines an example of the former case (nitrile rubberÈplasticizer systems) and one of the latter (acrylic rubberÈplasticizer systems).

Two possible explanations are o †ered for the observed behaviour. One is a possible contribution of a polar association to the plateau modulus : when a solvent breaks the association it gives the former case and when it does not, it gives the latter. The other explanation is a possible contraction of polymer coils from unperturbed size giving the former case, and an expansion giving the latter. Changes of less than a few percent of the coil-radius are sufficient to explain the above behaviour 1998 SCI.