Study On Preparation And Properties Of In-Situ Composites By Twin Rotors Long Contiuous Mixer

In this work, in-situ composites were prepared in a twin rotors long continuous mixer(LCM) by blending Polyethylene Terephthalate /Polypropylene(PET/PP) and thermotropic liquid crystalline polymers(TLCP)/PET/PP by a method, which is called Temperature Difference Blending(TDB). Through analyzing the SEM micrographs of binary PET/PP and ternary TLCP/PET/PP blends, influence of rheological behavior on fibrillation of dispersed phase was discussed, and the relationships between fiber micro-structure and processing temperatures, components content, shear rate were evaluated. The results showed that the dispersed phase in the matrix phase could form fibers through controlling above-mentioned processing conditions of LCM. And influence rules of forming and morphology of fibers by processing condition were achieved. The micro-morphology evolution of TLCP/PET/PP mixer was studied by changing processing temperatures and rotors speed. The evolution rule of the fibers was revealed in this ternary blends. The connection of compatibility and fibrillation was examined. The study showed that PP-g-MAH improved the fibrillation and mechanical properties of in-situ composities.The influences of PET mass content on tensile strength, together with its functional mechanism were studied. With higher PET component content, larger the tensile strength of the composites was achieved and to an extremum with PET component of 15%. PA6/PP and TLCP/PA6 in-situ composites were prepared, and fibrillation rules were studied finally.