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Title: Dynamics and relaxation of anisotropic elastomers
Author: Hotta, A.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2003
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This thesis is concerned with the dynamics and mechanical relaxation properties of three types of anisotropic rubbers. The main part of the work concentrates on Liquid Crystalline Elastomers (LCE). The first type of elastomer is a monodomain LCE synthesised from a route established by Finkelmann et al. The second elastomer is a polydomain LCE. Finally an elastomeric block copolymer is included in the work. A range of mechanical measurements were made to explore the physical properties of the materials over a wide range of temperatures. Stress/Strain, dynamic mechanical data and thermal expansion data are presented for certain materials. In addition, X-ray order parameter data is measured. Key findings from the work include the experimental observations of a reduction in shear modulus of the monodomain LCE at the nematic-isotropic transition and the result was found to be consistent with previously published theoretical modelling. In addition, thermal expansions changes at the nematic-isotropic transition were correlated with X-ray order parameter data and theoretical model. The effect of chain stiffness was systematically explored. Anisotropic elastic properties were established and time-temperature superpositions were explored for all materials. Some of the results presented in this thesis have appeared as publications.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available