Summary
The thermal and dynamic-mechanical behavior of two chiral liquid-crystalline networks are described. Both polymer networks formed a smectic mesophase whose isotropization temperature and enthalpy decreased with increasing crosslinking degree. The dynamic-mechanical behavior was studied in the linear viscoelasticity range. Three main relaxation regions were assigned to the β relaxation, the α network relaxation and the isotropization. Thus, it was possible to monitor the dynamic-mechanical response of the networks in both the anisotropic and isotropic states. Values of the storage and loss dynamic moduli in the range 106–107 Pa were detected in the isotropic state. Above the α relaxation temperature, either an elasticity or viscosity dominant state was observed depending upon the crosslink density of the network.
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Lestel, L., Galli, G., Laus, M. et al. Thermal and dynamic-mechanical properties of new chiral smectic networks. Polymer Bulletin 32, 669–674 (1994). https://doi.org/10.1007/BF00973917
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DOI: https://doi.org/10.1007/BF00973917