Connector Type-Controlled Mesophase Structures in Poly(propyl ether imine) Dendritic Liquid Crystals of Identical Dendrimer Generations

Kumar, Prabhat and Rao, D S Shankar and Prasad, S Krishna and Jayaraman, Narayanaswamy (2017) Connector Type-Controlled Mesophase Structures in Poly(propyl ether imine) Dendritic Liquid Crystals of Identical Dendrimer Generations. In: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 55 (22). pp. 3665-3678.

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Abstract

Poly(propyl ether imine) (PETIM) dendrimers of one to three generations are used as dendritic cores to identify the influence of varying connector types that connect the dendritic core with peripheral mesogens on the emerging liquid crystalline (LC) properties. The LC properties vary in these dendritic liquid crystals, even when the dendrimer generations and thus the number of peripheral mesogenic moieties remain identical. PETIM dendrimer generations one to three, ester and amide connectors varying with succinates, phthalates, and succinamides, are studied herein. Cholesteryl moieties are installed at the peripheries through the above connectors to induce mesogenic properties. These modified dendritic liquid crystals reveal a layered mesophase structure in most ester and amide connector-derivatives, whereas a third-generation phthalate ester dendrimer favors a rectangular columnar mesophase structure. A transition from layered to a rectangular columnar structure results by a mere change in the connector varying between a succinate or succinamide or phthalate, within one particular dendrimer generation and without altering the underlying dendrimer core or the number of mesogenic moieties. The study demonstrates that in dendritic liquid crystals with essentially identical chemical constitutions, a change in the connector type connecting the mesogen with the dendrimer core is sufficient to change the mesophase structures. (C) 2017 Wiley Periodicals, Inc.

Item Type:	Journal Article
Publication:	JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Additional Information:	Copy right for this article belongs to the WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	30 Oct 2017 03:40
Last Modified:	30 Oct 2017 03:40
URI:	http://eprints.iisc.ac.in/id/eprint/58083

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