A thiol‐ene clickable hyperbranched polyester via a simple single‐step melt trans‐esterification process. Issue 10 (10th December 2013)

• Record Type: Journal Article
• Authors: Shree Varaprasad, N. S.; Venkhatesh, Prasanna; Ramakrishnan, S.
• Is Part Of: Journal of applied polymer science. Volume 131:Issue 10(2014:May 15)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2013-12-10
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.40248
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Self‐condensation of <bold>AB₂</bold> type monomers (containing one A‐type and two B‐type functional groups) generates hyperbranched (HB) polymers that carry numerous <bold>B</bold>‐type end‐groups at their molecular periphery; thus, development of synthetic methods that directly provide quantitatively transformable peripheral <bold>B</bold> groups would be of immense value as this would provide easy access to multiply functionalized HB systems. A readily accessible <bold>AB₂</bold> monomer, namely diallyl, 5‐(4‐hydroxybutoxy)isophthalate was synthesized, which on polymerization under standard melt‐transesterfication conditions yielded a <italic>peripherally clickable HB polyester</italic> in a single step; the allyl groups were quantitatively reacted with a variety of thiols using the facile photoinitiated "thiol‐ene" reaction to generate a wide range of derivatives, with varying solubility and thermal properties. Furthermore, it is shown that the peripheral allyl double bonds can also be readily epoxidized using meta‐chloroperoxybenzoic acid to yield interesting HB systems, which could potentially serve as a multifunctional cross‐linking agent in epoxy formulations. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2014</bold>, <italic>131</italic>, 40248.</p> </abstract>