Development of epoxy/hyperbranched blends for resin transfer molding and vacuum assisted resin transfer molding applications: Effect of a reactive diluent

The rheological and thermomechanical properties of some epoxy blends modified with hyperbranched polymers are reported. The effects of different percentages of a multifunctional reactive diluent were investigated to develop formulations that could be processed by RTM (Resin Transfer Molding) and VAR...

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Bibliographic Details
Published in:	Polymer engineering and science Vol. 49; no. 3; pp. 577 - 584
Main Authors:	Cicala, G., Recca, G., Carciotto, S., Restuccia, C.L.
Format:	Journal Article
Language:	English
Published:	Hoboken Wiley Subscription Services, Inc., A Wiley Company 01-03-2009 Wiley Society of Plastics Engineers, Inc Blackwell Publishing Ltd
Subjects:	Applied sciences Chemical properties Composite materials Epoxy resins Exact sciences and technology Injection moulding Machinery and processing Mechanical properties Methods Molding Molds & molding Moulding Plastics Polyesters Polymer industry, paints, wood Production processes Properties and testing Technology of polymers Vacuum technology Branched polymer Property composition relationship Ester polymer Epoxy resin Processability Curing (plastics) Experimental study Transfer molding Dynamic mechanical properties Vacuum molding Aliphatic polymer Technological properties Modified material Rheological properties
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Summary:	The rheological and thermomechanical properties of some epoxy blends modified with hyperbranched polymers are reported. The effects of different percentages of a multifunctional reactive diluent were investigated to develop formulations that could be processed by RTM (Resin Transfer Molding) and VARTM (Vacuum‐Assisted Resin Transfer Molding). The diluent chosen for the study was trimethylolpropane triglycidyl ether, which was added at three percentages: 10%, 20%, and 40%. The hyperbranched modifier used was aliphatic polyester of the fourth pseudo‐generation commercialized by Perstorp as Boltorn™ H40. A cure cycle composed of a precure at 135°C followed by a postcure at 180°C was adopted. The blends were thoroughly characterized in both the unreacted and cured states. The unreacted blends were characterized by parallel plate rheometry, both in dynamic and isothermal mode. Analysis of the cured samples was carried out through dynamic mechanical tests after precuring and postcuring. The diluent had an impact, due to its peculiar structure, on both the uncured and cured properties. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers
Bibliography:	ark:/67375/WNG-V7QSZ53V-L Italian MUR (PRIN financing scheme) istex:C61F7BE93DE17F00F33F3C73E2F6DA9ACC145735 ArticleID:PEN21282 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0032-3888 1548-2634
DOI:	10.1002/pen.21282