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Saxs Measurement of Morphology and its Relationship to Melting Point Depression in Poly(Beta-Hydroxybutyrate-CO-Beta-Hydroxyvalerate) Random Copolymers

Published online by Cambridge University Press:  06 March 2019

Terry L. Bluhm ,
William J. Orts  and
Robert H. Marchessault
Terry L. Bluhm
Affiliation:
Xerox Research Centre of Canada Mississauga, Ontario, Canada
William J. Orts
Affiliation:
Xerox Research Centre of Canada Mississauga, Ontario, Canada
Robert H. Marchessault
Affiliation:
McGill University Montreal, Quebec, Canada
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Abstract

Small-angle x-ray scattering (SAXS) and wide-angle x-ray diffraction (WAXD) data are used to establish relationships among the degree of crystallinity, melting temperature and lamellar thickness for random copolymers of poly(β-hydroxybutyrate-co-β-hydroxyvaierate) (PHB/V). The morphology of this isodimorphic system is best described by a two phase model consisting of crystalline and amorphous domains having density fluctuations within each domain. The Sanchez-Eby inclusion model is used to predict melting point depression in these materials and, combined with SAXS data, to gain insight into the degree of inclusion of hydroxy valerate units within the polyhydroxybutyrate crystalline domains.

Type
IX. XRD Applications: Detection Levitts, Superconductors, Organics, Minerals
Information
Advances in X-Ray Analysis , Volume 35 , Issue A: First Pacific-International Congress on X-ray Analytical Methods (PICXAM). Fortieth Annual Conference on Applications of X-ray Analysis, August 7-16, 1991 , 1991 , pp. 645 - 651
Copyright
Copyright © International Centre for Diffraction Data 1991

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