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CHEMISTRY moment EDITION
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Extra info for Chemistry: Concepts and Problems: A Self-Teaching Guide (Wiley Self-Teaching Guides)
J. Müller et al. Fig. 6 a DSC cooling scans (10 ◦ C min–1 ) for poly(ε-caprolactone) (PCL) and poly(pdioxanone) (PPDX) homopolymers, diblock copolymers and a 50/50 blend. b Subsequent heating scans (10 ◦ C min–1 ). (From . Reproduced with permission of the Royal Society of Chemistry) Fig. 7 Relative integrated intensities under the peaks (left scale) and relative degree of crystallinity (right scale) obtained from wide-angle X-ray scattering data for D77 32 C23 10 quenched from T = 115 to 30 ◦ C.
105] when they studied by DSC the crystallization kinetics of 80/20 PCL-b-PEO diblock copolymers. In their case, the PCL block crystallized ﬁrst from a homogeneous melt and the Avrami parameters K and n were found to be similar to the kinetics parameters of the isothermal crystallization of a corresponding PCL homopolymer. Signiﬁcant crystallization retardation was found for the PEO block that crystallized second. The retardation was attributed to the “mutual inﬂuence between the PEO constituent and the PCL crystal phase which ﬁxes (hardened) the total copolymer structure” .
Kim et al. 6. 32 was phase-separated Fig. 9 Inverse of the crystallization half-time as a function of isothermal crystallization temperature for PCL11 homopolymer and for the PCL block of the indicated copolymers. All experiments were performed after the PPDX block had been previously crystallized until saturation. Solid lines are ﬁts to the Lauritzen and Hoffman theory. (From . Reproduced with permission of the Royal Society of Chemistry) Nucleation and Crystallization in Diblock and Triblock Copolymers 35 in the melt at 220 ◦ C according to rheological measurements; however, SAXS failed to show any signs of phase segregation.