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Isothermal thickening

Wunderlich30 and Zubov33 suppose that ECC under high pressures occur as a result of an isothermal thickening of folded-chain lamellae. However, this contradicts the later data of Wunderlich and of Japanese authors31 who have shown that folded-chain crystals (FCC) are formed after ECC, when the melt is cooled. According to Kawai22, crystallization under hydrostatic compression can he considered as a variant of the bicomponent crystallization. [Pg.216]

The isothermal thickening (avoiding very short times) of mature crystals of conventional polyethylenes follows the equation [55] ... [Pg.42]

This shows that by means of synchrotron radiation, for the first time the primary lamellar thickening on melt crystallization in polyethylene could be observed. This enabled also the determination of the true crystal thickness as a function of supercooling AT. Most satisfyingly it was found to be closely identical to that obtained in solution crystallization were no isothermal thickening takes place. In conclusion, the hitherto existing gap between melt and solution crystallization has been removed and the corresponding f versus AT curves brought in coincidence. [Pg.41]

Cheng S, Wu S, Hen JH, Zhuo Q, Quirk R, von Meerwall E, Hsiao B, Habenschuss A, Zsch P (1993) Isothermal thickening and thinning processes in low molecular weight poly(ethylene oxide) fractions crystallized from the melt. 4. End-group dependence. Macromolecules 26(19) 5105-5117... [Pg.34]

Hoffman JD, Lauritzen J (1961) Crystallization of bulk polymers with chain folding theory of growth of lamellar spherulites. J Res Natl Bur Stand A65(4) 297-336 Hoffman JD, Miller RL (1997) Kinetic of crystallization from the melt and chain folding in polyethylene fractions revisited theory and experiment. Polymer 38(13) 3151-3212 Hoffman JD, Weeks JJ (1965) X-Ray study of isothermal thickening of lamellae in bulk polyethylene at the crystallization temperature. J Chem Phys 42(12) 4301-4302... [Pg.139]

Isothermal Thickening and Thinning Processes in Low Molecular Weight Poly(ethylene oxide) Fractions Crystallized from the Melt... [Pg.118]

Hoffman JD, Weeks JJ. X-ray study of isothermal thickening of lamellae in bulk polyethylene at the crystallization temperature. J Chem Phys 1965 42 4301-4302. [Pg.256]

An inversion in the growth rate of methoxy terminated poly(ethylene oxide), with a molecular weight of 3000 has been reported. (317) The inversion occurred in a 1 °C temperature range where both extended and folded crystallites are observed. The isothermal thickening that takes place here can easily influence the growth rate... [Pg.182]

The interest at this point is limited to the influence of isothermal thickening on the kinetics. The structural and morpholc ical changes that occur on thickening, as well as theoretical interpretations of the process, will be discussed in Volume 3. [Pg.382]

See other pages where Isothermal thickening is mentioned: [Pg.12]    [Pg.14]    [Pg.309]    [Pg.200]    [Pg.246]    [Pg.418]    [Pg.50]    [Pg.81]    [Pg.85]    [Pg.85]    [Pg.4959]    [Pg.187]    [Pg.188]    [Pg.268]    [Pg.176]    [Pg.169]    [Pg.170]    [Pg.173]    [Pg.179]    [Pg.186]    [Pg.186]    [Pg.382]    [Pg.382]    [Pg.383]    [Pg.385]    [Pg.390]    [Pg.391]   
See also in sourсe #XX -- [ Pg.200 , Pg.204 ]



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