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Development of a Coarse Spherulite in Poly ( vinylidene fluoride ) / Poly ( methyl methacrylate ) Blends
( Chang Hyung Lee , Joon Hyung Kim , Yong Moo Lee , Hyeong Ki Choi )
UCI I410-ECN-0102-2009-570-007340420
* 발행 기관의 요청으로 이용이 불가한 자료입니다.

The spherulite formation in poly(vinyliden fluoride) (PVDF)/poly(methyl methacrylate) (PMMA) blend was investigated by time-resolved light scattering under H_v (cross-polarized) optical alignment using (CCD) camera system. The final morphology was observed by atomic force microscopy (AFM) images and optical microscope (OM). The coarse spherulite was observed at high temperature (162 ℃) by OM, whereas the compact spherulite was appeared at low temperature (148℃). In the compact spherulite, the spherulite radius linearly increased with time. The order parameter defined by the sharpness of Hv scattering profile monotonously decreased with crystallization. In the coarse spherulite, the spherulite linearly grew, stopped growth for a while, and then restarted i.e., a pause in growth was observed. It was ascribed to the rejection of the noncrystallizable component (PMMA) at spherulite growth front. The order parameter initially increased, attained a maximum, and then decreased. Time at maximum point was consistent with onset time of a pause in the spherulite growth. Thus, a maximum in order parameter may be ascribed to the rejected PMMA at the spherulite growth front. A supplemental evidence for these results was provided by the morphology observation of the AFM

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