| Arm relaxation in deformed h-polymers in elongational flow by SANS (2002) | |||||||||||
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| Arm Relaxation Deformed Polymers Elongational Flow SANS Heinrich Pyckhout Hintzen Allgaier and Richter Forschungszentrum lich Institut Festko rperforschung Postfach lich Germany Straube Martin Luther Universita Halle Wittenberg Fachbereich Physik Halle Germany Read Department Applied Mathematics University Leeds Leeds B McLeish Groves and Blackwell in Polymer Science and Technology Department Physics University Leeds Leeds Wiedenmann Hahn Meitner Institut Berlin Germany Received November ABSTRACT present small angle neutron scattering SANS investigation the relaxation process branched polymer melts under deformation The selected model polymer shaped polyisoprene having deuterium labeled blocks the dangling tips the arms The melt step strained strain rig especially built for that purpose where the sample temperature and its deformation conditions are precisely controlled Uniaxial extensions values and are performed temperature above the polymer glass transition temperature The sample then allowed relax during given time before being quenched below its order freeze the chains conformation perform the SANS experiments Very large anisotropies develop time scales corresponding the relaxation the dangling arms The experimental structure function then compared theoretical ones obtained the random phase approximation applied the tube model While theory describes well the scattering for short times seems not able describe the increase intensity the direction parallel the strain higher | |||||||||||
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