| Intermediate length scale dynamics of polyisobutylene (2002) | |||||||||||
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| Intermediate length scale dynamics polyisobutylene Farago Arbe Colmenero Faust Buchenau and Richter Institut Laue Langevin Grenoble Cedex France Unidad sica Materiales CSIC UPV EHU Apartado San Sebastia Spain Departamento sica Materiales Universidad del Vasco UPV EHU Apartado San Sebastia Spain Donostia International Physics Center Apartado San Sebastia Spain Polymer Science Program Department Chemistry University Massachusetts Lowell One University Avenue Lowell Massachusetts Institute Festko rperforschung Forschungszentrum lich lich Germany Received December published May report neutron spin echo investigation the intermediate scale dynamics polyisobutylene studying both the self motion and the collective motion The momentum transfer dependences the self correlation times are found follow law agreement with the picture Gaussian dynamics the full range observation their temperature dependence weaker than the rheological shift factor The same true for the stress relaxation time seen sound wave absorption The collective times show both temperature dependences the structure factor peak they follow the temperature dependence the viscosity but below the peak one nds the stress relaxation behavior DOI PhysRevE PACS number Ex INTRODUCTION Experimental results the collective relaxational tions intermediate length scales are white area the landscape the dynamics glass forming liquids and even more polymers Intermediate scales denote the regime lengths larger than the interparticle di | |||||||||||
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