Abstract: Crystalline polymorphs from the glass state of poly(vinylidene fluoride)(PVF₂)inducedby high-rate heating have been studied by FTIR and TEM. The glass state PVF₂ samplewas obtained by ultraquenching the thin films into liquid nitrogen. Three kinds of poly-morphs were formed when the sample was heated very quickly to higher temperatures withsubsequent isothermal crystallization. High-rate warming the glass to the temperatures below 30℃ results in formation of βphase microcrystals. When the glass is heated very quicklyto 150℃ predominantly the α phase lamellae or spherulites were obtained, while at temp-eratures of 40-70℃,the βphase and αphase coexisted. If the temperature of high-rate heatingwas upto 165℃, the perfect spherulites of γphase PVF₂ were observed.

Key words: poly(vinylidene fluoride), glass state, high-rate heating, polymorphs