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Small-Angle Scattering Investigations of Crystalline BlendMorphologies 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 deuteratedpolycarbonate (PC) blends in both the semicrystalline/amorphous state andsemicrystalline/semicrystalline state were probed by small-angle neutron andX-ray scattering (SANS and SAXS). Due to the different contrast between thephases for neutrons and X-rays, SANS exhibited a monotonie drop in intensitywith increasing scattering angle while SAXS showed lamellar (peak)scattering.

Crystal- and amorphous-phase thickness were determined from the correlationfunction calculated from SAXS. This correlation function analysis suggesteda transition from interlamellar exclusion to interlamellar incorporation ofamorphous PCL in the PC lamellae. A two-correlation length model provided anexcellent fit for the SANS data over the entire composition range. ThisModel not only reproduced the shape but also the absolute magnitude of thescattering profiles. The long range correlation length (∼102 Å)and the short range correlation length (∼ 10 Å) derived from this model wereinferred to be associated with the crystalline PC domains and the localclusters 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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