Structural variants of hyperbranched polyesters

Kumar, Anil ; Ramakrishnan, S. (1996) Structural variants of hyperbranched polyesters Macromolecules, 29 (7). pp. 2524-2530. ISSN 0024-9297

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Hyperbranched polyesters based on 3,5-dihydroxybenzoic acid and its derivatives were prepared by self-condensation of the corresponding ester under standard trans-esterification conditions. The spacer segment length that connects the branching points was systematically varied by starting from the appropriate ethyl 3,5-bis(ω-hydroxyoligo(ethyleneoxy))benzoate. The thermal properties of the hyperbranched polyesters were studied using DSC, and they have been compared with those of the linear analogues prepared from the corresponding p-hydroxybenzoic acid derivatives and also with the molecularly "kinked" analogues prepared from the meta isomers. These hyperbranched polyesters were also terminally functionalized by using a potentially mesogenic 4-butoxybiphenylcarboxylic acid derivative in an attempt to prepare novel hyperbranched liquid crystalline polyesters. This was achieved by copolymerization of the AB2 monomer with the mesogenic A-type capping unit. These polymers were found to be amorphous and did not exhibit any liquid crystalline phases, probably due to the random distribution of the mesogenic segments on the polymer framework, making it difficult to both crystallize and form mesophases.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:67250
Deposited On:29 Oct 2011 12:03
Last Modified:29 Oct 2011 12:03

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