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- W2159720821 abstract "Abstract We examine the influence of structural imperfections on mechanical damping in polydomain smectic main‐chain liquid crystalline elastomers (MCLCE) subjected to small strain oscillatory shear. The mechanical loss factor tan δ = G ″(ω)/ G ′(ω) exhibits a strong maximum (tan δ ≈ 1.0) near the smectic‐isotropic (clearing) transition. “Optimal” elastomers that exhibit minimal equilibrium swelling in a good solvent are compared with highly swelling “imperfect elastomers” that contain higher concentrations of structural imperfections such as pendant chains. For the imperfect elastomers, tan δ is markedly enhanced in the isotropic state because of relaxation of pendant chains and other imperfections. However, within the smectic state, the magnitude of tan δ and its temperature dependence are similar for optimal and imperfect elastomers at ω = 1 Hz. The prominent loss peak near the clearing transition arises from segment‐level relaxations that are insensitive to the details of chain connectivity. Smectic MCLCE can be tailored for applications as vibration‐damping materials by manipulating the clearing transition temperature through the backbone structure or by deliberate introduction of structural imperfections such as pendant chains. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 3267–3276, 2007" @default.
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- W2159720821 date "2007-10-30" @default.
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- W2159720821 title "Effects of structural imperfections on the dynamic mechanical response of main‐chain smectic elastomers" @default.
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- W2159720821 doi "https://doi.org/10.1002/polb.21329" @default.
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