SynopsisThe course of liquid-induced crystallization of a bisphenol A-derived polycarbonate was investigated using acetone, methyl propyl ketone, methyl isobutyl ketone, and xylene as swelling agents. It was found that above a certain temperature, characteristic of a given polycarbonate-swelling agent system, the diffusion process takes place with the formation of a sharp boundary. The velocity of motion of the diffusion front was determined at various temperatures, and these data were then used to calculate the apparent diffusion coefficients and diffusion activation energies for the different swelling liquids employed. Moreover, a distinct separation of the diffusion and crystallization fronts was observed in the systems investigated, changes in the distance between these two fronts having been determined for various swelling temperatures. The above phenomenon was used to determine the experimental conditions making possible the characterization of a crystallization process not controlled by the diffusion of the swelling agent into the sample. The dependence of half-times of crystallization on temperature was determined based on crystallization kinetics studies performed by means of a light depolarization technique.

Rate of the diffusion front displacement, rate of sorption and rate of turbidity for the system of bisphenol A polycarbonate foil‐methylisobutylketone were determinated. The influence of the temperature on the observed phenomena was investigated. An attempt at apreliminary interpretation was done.

The rate of growth of spherulites and the kinetics of crystallization OI a carbon tetrachloride-swollen Bisphenol A polycarbonate were determined in the temperature range from 308 K to 343 K by means of an optical microscope.The optical nature of the forming spherulites was investigated. Changes of the final degree of swelling with temperature were determined gravimetrically. Mikroskopische Untersuchung der flussigkeits-induzierten Kristallisation des Systems Polycarbonat (Bisphenol A ) / TetrachlormethylenMit Hilfe der optischen Mikroskopie wurden im Temperaturbereich von 308 K bis 343 K die Geschwindigkeit des Sphiirolithwachstums und die Kristallisationskinetik des in CCI, gequollenen Polycarbonats aus Bisphenol A bastimmt. Der optische Charakter der gebildeten Spharolithe wurde untersucht. Die Temperaturabhangigkeit des Endquellungsgades wurde gravimetrisch bestimmt. ((aHHOn x p u c m a a u a a y u u cuemeabz nosuxap6onam (Guc@enon A) lmempaxnopwemuneIc c@eponmoB H KHHeTma KpHcTannmaI[m ~a6yxmero B CCn, n o n m~a p 6 0~a r a Ha ocHoBe 6xc@eHona A. Hccnepo-(: IIOMOIIJbH, OIITHqeCKOm MHKPOCKOIIHH OIIpeAeJIRJIaCb B o6nac~a Te?EIIepaTyp OT 308 A0 343 CKOpOCTh pOCTa BaJIaCb OIITHYeCHaH IIpHpOAa 06pa30BaHHbIX C@ePOnMTOB. rpaBHMeTpH9eCHHM MeTOAOM OIIpeAenRJIaCb TeMIIepaTyp-H a R SaBXCMMOCTb HOHeYHOa CTeIIeHH ~a 6 y x a~~~. Muxpocxonuuecxoe uccaedosame ~uaxoCmFLo-U~ayyUPO