| Physical nature of complex structural relaxation in polysiloxane - PmpTS: alpha and alpha' relaxations (2006) | |||||||||||||
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| Physical nature complex structural relaxation polysiloxane PMpTS and relaxation Patkowski Gapinski Pakula Meier Institute Physics Mickiewicz University Umultowska Poznan Poland Max Planck Institute Polymerforschung Ackermannweg Mainz Germany Institut Festk rperforschung Forschungszentrum lich Postfach lich Germany Abstract Structural relaxation processes poly methyl para tolyl siloxane PMpTS polymers three molecular weights were studied using dynamic light scattering Two relaxation processes the usual and additional slow one were observed and studied function temperature and molecular weight Contrary the structural relaxation find that plot the relaxation times for the process for all molecular weights not collapse single curve For one the samples the light scattering correlation functions were compared with the corresponding functions obtained means mechanical relaxation dielectric spectroscopy and computer simulations The simulations show that the bimodal distribution the relaxation and the slow process are contained the correlation functions most the probes optical anisotropy dipole moment chain bond density agreement with experimental observations Introduction The most drastic change the macroscopic behaviour amorphous polymers occurs the glass transition which the material transforms from hard solid viscoelastic fluid when heated and from the fluid the glass when cooled The transition related changes dynamics and well established that the segmental mobility which allows | |||||||||||||
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