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Small-Angle Scattering Investigations of Crystalline Blend Morphologies of Poly (E-Caprolactone) (PCL)/Polycarbonate (PC) Blends

Published online by Cambridge University Press:  15 February 2011

Y. Wilson Cheung ,
R. S. Stein ,
G. D. Wignall  and
J. S. Lin
Y. Wilson Cheung
Affiliation:
University of Massachusetts, Department of Polymer Sci. and Eng., Amherst, Mass. 01003
R. S. Stein
Affiliation:
University of Massachusetts, Department of Polymer Sci. and Eng., Amherst, Mass. 01003
G. D. Wignall
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN. 37831
J. S. Lin
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN. 37831
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Abstract

Crystalline Morphologies of poly (e-caprolactone) (PCL) and deuterated polycarbonate (PC) blends in both the semicrystalline/amorphous state and semicrystalline/semicrystalline state were probed by small-angle neutron and X-ray scattering (SANS and SAXS). Due to the different contrast between the phases for neutrons and X-rays, SANS exhibited a monotonie drop in intensity with increasing scattering angle while SAXS showed lamellar (peak) scattering.

Crystal- and amorphous-phase thickness were determined from the correlation function calculated from SAXS. This correlation function analysis suggested a transition from interlamellar exclusion to interlamellar incorporation of amorphous PCL in the PC lamellae. A two-correlation length model provided an excellent fit for the SANS data over the entire composition range. This Model not only reproduced the shape but also the absolute magnitude of the scattering profiles. The long range correlation length (∼102 Å) and the short range correlation length (∼ 10 Å) derived from this model were inferred to be associated with the crystalline PC domains and the local clusters found in the amorphous phase, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 549
Copyright
Copyright © Materials Research Society 1994

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References

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