Dynamic mechanical behavior of poly(vinyl chloride)/poly(methyl methacrylate) polymer blend

✍ Scribed by R. Flores; J. Perez; P. Cassagnau; A. Michel; J. Y. Cavaillé

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 1001 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960531)60:9<1439::aid-app19>3.0.co;2-x

✦ Synopsis

A poly(viny1 chloride) (PVC)/poly(methyl methacrylate) (PMMA) (80/20 w/w) polymer blend was studied by mechanical spectroscopy. Two relaxations can be distinguished in the glassy state, a very large secondary relaxation in the range of 100 K to 325 K which results from the combination of secondary relaxations of PVC and PMMA; and only one main relaxation a t 364 K associated to the glass rubber transition. The relaxation spectrum in the range of the @ relaxation has been described by a relaxation time distribution function based upon a Gaussian function and a series-parallel model. The a relaxation was studied by means of a theoretical approach for the nonelastic deformation of polymers. We found that the miscibility of this blend appears to be a function of the observation scale: the PVC/PMMA blend is heterogeneous at the scale of molecular movements involved for the p relaxation process but homogeneous a t the scale of the chain segments responsible for the a relaxation dynamics.