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Effect of solution-blended poly(styrene-co-acrylonitrile) (SAN) copolymer on crystallization of poly(vinylidene fluoride) (PVDF) was investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). Acrylonitrile segment in SAN copolymer was partially miscible with PVDF. Styrene segment in SAN reduced the copolymer&#8217;s polarity and its miscibility with PVDF. FTIR and WAXD tests both showed as-prepared PVDF was mainly &#946;-phase. We employed an index A&#946;&#61472;divided by Xc, suggesting that blended SAN could decrease the content of &#946;-phase of PVDF. By DSC, the smaller content of PVDF made the system more miscible so that the Tg,SAN of pure SAN decreased from 86.6 to 81.6°C of sample PVDF/SAN = 20/80; further increase PVDF to 50/50, the Tg,SAN had a relative increase to be 84.2°C. However, for SAN by melt molding, Tg,SAN increased with the increase of PVDF content, which might be due to the incorporation of SAN into inter-spacing of PVDF lamellae, because PVDF molecular chains had not enough mobility to retreat from the SAN&#8217;s embrace and crystallize despite of the exit of SAN

Effect of solution-blended poly(styrene-co-acrylonitrile) copolymer on crystallization of poly(vinylidene fluoride)