Authors Sangermano, M. ; Di Gianni, A. ; Malucelli, G. ; Roncuzzi, C. ; Priola, A. ; Voit, B.
Title Cationic Photopolymerization of Oxetane-Functionalized Hyperbranched Polymers
Date 20.05.2005
Number 12483
Abstract An aliphatic-aromatic pehenolic hyperbranched starting material (HBP-OH) with phenolic end groups was 85% functionalized by a Mitsunobu reaction with oxetane groups (OXT-HBP). This new hyperbranched polyester was used, at a concentration of 5-20 wt %, as an additive for the cationic photopolymerization of a commercial oxetane-based resin, 4,4<IMGSRC="/giflibrary/12/prime.gif"BORDER="0">-bis[(3-ethyl-3-ethyl-3-oxetanyl) methoxymethyl]biphenyl (OXBP). HBP-OXT acted as a multifunctional crosslinker, copolymerizing with the oxetane ring of the OXBP resin, reacting through chain transfer with the remaining phenolic OH groups, or doing both. The result was an increase in the glass-transition temperature due to the increase in the crosslinking density. An increase in the weight residue at a high temperature was found in the presence of HBP-OXT and was attributed to the presence of phenolic groups, which are commonly used as antioxidant additives. &copy; 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 293-299, 2005
Publisher Journal of Applied Polymer Science
Citation Journal of Applied Polymer Science 97 (2005) 293-299
Tags hyperbranched cationic photopolyrnerization thermal properties epoxy monomers ether systems polymerization polyesters additives resins

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