1 January 1998 Depression of mesophase stability caused by polymerization
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Side-on polysiloxanes bearing laterally branched mesogens were synthesized. The mesogens have a bulky lateral branch containing an aromatic ring with an alkenyl chain in para- position, which enables a coupling to the polysiloxane backbone. Surprisingly, reaction with poly-H-siloxane can cause increasing or decreasing of the clearing temperatures. The dimension of the mesophase destabilization was found to be up to 27 K. By systematic investigations of this unusual effect we could prove a clear dependence on steric proportions. Especially, the relation of the length of the terminal alkyl chains R1 and the length n of the flexible aliphatic spacer is of influence.
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A. Jacobi, A. Jacobi, G. Pirwitz, G. Pirwitz, Wolfgang Weissflog, Wolfgang Weissflog, } "Depression of mesophase stability caused by polymerization", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301295; https://doi.org/10.1117/12.301295

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