J. Phys. IV France 03 (1993) C8-3-C8-12
Scaling properties and ordering phenomena of star polymers in solutionD. RICHTER1, O. JUCKNISCHKE1, L. WILLNER1, L.J. FETTERS2, M. LIN2, J.S. HUANG2, J. ROOVERS3, C. TOPOROVSKI3 and L.L. ZHOU3
1 Institut für Festköperforschung, Forschungszentrum Jülich, 5170 Jülich, Germany
2 Exxon Research and Engineering Corporation, Annandale, New Jersey 08801, US.A.
3 Institute for Environmental Chemistry, National Research Council of Canada, Ottawa, Ontario, K1A O36, Canada
Star polymers are prototype systems both for tethered chains as well as for branched polymers. In this study we present a thorough investigation of the single star form factors in dilute solutions spanning a range of functionalities from 8 to 128. Using the zero average contrast method the form factor determination was also extended into the semidilute regime. As a consequence of their very inhomogeneous monomer density distribution star polymers exhibit osmotic repulsion leading to ordering phenomena in the neighborhood of the overlap concentration. We present a detailed investigation of such ordering phenomena in star polymer solutions with varying functionality and molecular weight. In all cases we observe an interparticle structure factor which is most pronounced at the overlap concentration Φ*. The ordering tendency increases with increasing functionality. These results are compared with current theoretical predictions.
© EDP Sciences 1993