Structural characterization of polymacromonomer in solution by small-angle x-ray scattering

✍ Scribed by Wataoka, Isao; Urakawa, Hiroshi; Kajiwara, Kanji; Schmidt, Manfred; Wintermantel, Matthias

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 436 KB
• Volume: 44
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199711)44:3<365::aid-pi871>3.0.co;2-x

✦ Synopsis

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 proÐle Ðtting. 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 suggested a random coil conformation for (DP M \ 7) 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.