Compatibility of polymer blends evaluated by crystallization dynamics. Simultaneous DSC-FTIR method

The mixing state of poly(vinylidene fluoride) (PVDF) and two amorphous poly mers, poly(methyl methacrylate) (PMMA) and poly(isopropyl methacrylate) (Pi PMA) were investigated from the viewpoint of crystallization dynamics using simultaneous DSC-FTIR method. The crystallization rate (R*) and the growth rate of trans-gauche-trans-gauche' (TGTG') conformation (Rc*) depended on both the blend content (phi) and the crystallization temperature for PVDF/P MMA. The temperature and phi dependency of R* and Rc* were almost the same for PVDF/PMMA. However, R* and Rc* depended scarcely on f for PVDF/PiPMA, a nd the temperature dependency of R* differed from that of Rc* for PVDF/PiPM A. These results showed that PVDF and PMMA were miscible on molecular level , and that PVDF/PiPMA was immiscible and the concentration fluctuation exis ted in the PVDF-rich phase.