Rheological Study of the Interfacial Crosslinking Reaction in Reactive Polymer Blends

Applied Rheology

Bouquey M.¹  Terrisse J.¹  Cirman C.¹  Muller R.¹ 

[1] Laboratoire de Recherche sur les Procédés et Matériaux Polymères ECPM, Polymer Department, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France, Fax: x33.3.88136923;

关键词: rheology;    polymer blends;    interfacial reaction;   

DOI  :  10.1515/arh-2009-0008

来源: DOAJ

【 摘 要 】

Two reactive methacrylic polymers were synthesized by copolymerization of isobutylmethacrylate with a small amount of either methacrylic acid or glycidyl methacrylate. In a molten blend, the condensation reaction between the acid and epoxy groups leads to crosslinking at the interface between the domains formed by the two polymers. This reaction was followed by dynamic mechanical measurements in the melt. Blends were prepared by compression molding a mixture of pellets of controlled size and then by shearing these samples in a cone and plate rheometer up to different values of total shear strain, thus achieving different values of interfacial area per unit volume. Since the two copolymers are miscible, a homogeneous blend could be obtained by coprecipitation and was considered as a limiting case for high values of interfacial area. The glass transition temperature of the polymers was well below the temperature at which the kinetics of the condensation reaction becomes significant. It was therefore possible to separate the creation of interface by shearing from the interfacial crosslinking reaction, which was induced by increasing the temperature. For the blends with the highest values of interfacial area, the viscoelastic properties in the melt after reaction revealed a low frequency plateau for the storage modulus G’, whose level increases almost linearly with the amount of applied shear strain.

【 授权许可】

Unknown