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Structural characterization of polymacromonomer in solution by small‐angle x‐ray scattering
Author(s) -
Wataoka Isao,
Urakawa Hiroshi,
Kajiwara Kanji,
Schmidt Manfred,
Wintermantel Matthias
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199711)44:3<365::aid-pi871>3.0.co;2-x
Subject(s) - branching (polymer chemistry) , degree of polymerization , polymerization , scattering , polymer , small angle x ray scattering , polymer chemistry , materials science , chemistry , molecular physics , chemical physics , crystallography , physics , optics , composite material
The polymerization of macromonomers provides polymers of extremely high branching density with regular branch length, branching number and branching interval. The intrinsic shape and size of these polymacromonomers were evaluated by small‐angle X‐ray scattering. The conformation of the backbone and side‐chains was discussed. An oblate ellipsoid of revolution was proposed as an approximate shape of the polymacromonomers at a low degree of polymerization by scattering profile fitting. An elliptical cylinder was found to outline the polymacromonomer in solution at larger degrees of polymerization. The 3D molecular model of a polymacromonomer with a low degree of polymerization ( DP M =7) suggested a random coil conformation for the backbone and side‐chains. The conformational change of the backbone chain is speculated to take place when the total degree of polymerization exceeds a certain limiting value, where the polymacromonomer is represented by a molecular bottle brush as seen by light‐scattering measurements. ©1997 SCI