Photonic polymers with the ability of broad range wavelength tuning that covers from visible to near-infrared region are of high interest for sensing, optoelectronic and display devices. Hence,we report on the synthesis and properties of liquid crystalline brush like copolymers with comblike architecture for preparation of multi-responsive materials for color modulation. Narrowly dispersed liquid crystalline brush-like block and random copolymers was achieved by ring-opening metathesis polymerization (ROMP) of various norbornene backbone monomers using modified second-generation Grubbs catalyst. In this study, two modular systems will be looked into: - first we will look at the morphology and optical properties of random terpolymers from monomers bearing n-alkyloxy cholesteryl (Ch9), n-alkoxy cyanobiphenyl (CB6 or CB12), and poly(ethylene glycol) (PEG) side chain; and in the second part we will discuss on the facile strategy of synthesizing monomers bearing azo chromophores with the ability of producing copolymers that cover broad wavelength ranges. The effects of the monomer sequence and terminal end groups on thermal, mesophase and optical properties will be reviewed. These copolymer scaffolds selfassembles to form cholesteric mesophases (N*) in which microphase-segregated domains of PEG side chains are randomly embedded. On the other hand, the incorporation of liquid crystalline monomers in these two platforms enables easy structural coloration change by use of external stimuli such as light irradiaion, electric or magnetic field and thermal annealing.  The copolymers described here provide a modular and versatile platform for optimizing the performance of novel generation of optoelectronic and photonic devices.<br/>

Facile design of multi-responsive liquid crystalline brush-like copolymers for color modulation

2019 Spring National Meeting

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