The morphology of the interface between miscible and immiscible polymer pairs was investigated. For the PVDF/PMMA system, which has a highly exothermic enthalpy of mixing, complex structures suggest the occurrence of bulk convective motion at the contact area between the two polymer melts. The immiscible pair PVDF/PS, displays a smooth interface under similar conditions. A simple method for testing compatibilizers is described. Using this method, styrene-methylmethacrylate random copolymers and PMMA were investigated as compatibilizers for the PVDF/PS blend. PVDF/PMMA/PS (1:1:1) ternary blends show some heterogeneity with small domains but their maximum tensile strength is of the same magnitude as that of PVDF/PMMA blends.
Bibliographical noteFunding Information:
The authors thank Professor Dr B. A. Wolf for helpful discussions. This work was supported by Fundaqio de Amparo fi Pesquisa no Estado de Silo Paulo (contract number 87/2440/1) and Conselho Nacional de Desen-volvimento Cientifico e Tecnologico (contract numbers 400120/89-5 and PADCT 701846/87-9). INBRAC, Sio Paulo, kindly provided the Brabender mixer.
- immiscible polymer pairs
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry