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Relationship between interchain spacing of amorphous polymers and blend miscibility as determined by wide‐angle X‐ray scattering
Author(s) -
Halasa A. F.,
Wathen G. D.,
Hsu W. L.,
Matrana B. A.,
Massie J. M.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430115
Subject(s) - miscibility , materials science , amorphous solid , polymer blend , polymer , small angle x ray scattering , scattering , polymer chemistry , diffraction , wide angle x ray scattering , crystallography , chemical engineering , composite material , optics , chemistry , copolymer , physics , small angle neutron scattering , neutron scattering , engineering
The average molecular interchain spacing (〈 R 〉) in Angstroms for amorphous polymers was calculated from the strong maximum in the wide‐angle X‐ray scattering (WAXS) diffraction scan using established equations. The half‐width ( HW ) of the maximum was used to qualitatively describe the distribution of 〈 R 〉. 〈 R 〉 and HW for immiscible blends corresponded to the weighted average of 〈 R 〉 and HW of the homopolymers in the blend. 〈 R 〉 for a miscible blend (natural rubber and high‐vinyl PBd) was much larger than the weighted average of 〈 R 〉 of the component homopolymers, indicating that a new amorphous molecular structure had developed. The larger 〈 R 〉 for the miscible blend indicates that the molecular chains are spread further apart, resulting in an increase in free volume to accommodate the new packing order. The single T g of this blend was lower than predicated by the Gordon‐Taylor equation.