Chinese Journal of Applied Chemistry ›› 1990, Vol. 0 ›› Issue (3): 60-63.

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EFFECT OF HIGH-RATE HEATING ON THE CRYSTALLIZATION OF GLASS STATE POLY(VINYLIDENE FLUORIDE)

Chen Ye, Yang Decai   

  1. Polymer Physics Laboratory Changchun Institute of Applied Chemistry Academia Sinica, Changchun 130022
  • Received:1989-04-06 Revised:1989-08-19 Published:1990-06-10 Online:1990-06-10

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