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Shrinkage Characteristics of Experimental Polymer Containing Composites under Controlled Light Curing Modes
Physics and Biophysics of Macromolecules at Interfaces. Institut Charles Sadron, UPR22, CNRS, 23 rue du Loess, B.P. 84047, 67034 Strasbourg Cedex 2, France
Received: 14 December 2011; in revised form: 4 January 2012 / Accepted: 14 January 2012 / Published: 18 January 2012
Abstract: The adsorption of polymethylmethacrylate polymer of different molecular weight at the aerosil/ethyleneglycol- or 1,3 butanediol-dimethacrylate interfaces was determined to provide microstructured networks. Their structural characteristics were determined to be controlled by the amount of polymer initially supplied to the system. The sediment (the settled phase) characteristics, determined as a function of the polymer concentration and the rate of the polymerization shrinkage determined for composite resins, obtained by extrusion of the sediment after centrifugation, were found to be correlated. The specific role of the adsorbed polymer was found to be differently perturbed with the supplementary supply of dimethacrylate based monomer additives. Particularly, the bisphenol A dimethacrylate that generated crystals within the sediment was found to impede the shrinkage along the crystal lateral faces and strongly limit the shrinkage along its basal faces. Addition of ethyleneglycol- or polyethylene-glycoldimethacrylate monomers was determined to modify the sedimentation characteristics of the aerosil suspension and the shrinkage properties of the composites. Finally, the effects of stepwise light curing methods with prolonged lighting-off periods were investigated and found to modify the development and the final values of the composite shrinkage.
Keywords: composite light curing; resin shrinkage; aerosil/polymer/dimethylacrylate based monomer resin; structured crystal-like composite; stability of polymer/aerosil suspension
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MDPI and ACS Style
Pefferkorn, A. Shrinkage Characteristics of Experimental Polymer Containing Composites under Controlled Light Curing Modes. Polymers 2012, 4, 256-274.
Pefferkorn A. Shrinkage Characteristics of Experimental Polymer Containing Composites under Controlled Light Curing Modes. Polymers. 2012; 4(1):256-274.
Pefferkorn, Alain. 2012. "Shrinkage Characteristics of Experimental Polymer Containing Composites under Controlled Light Curing Modes." Polymers 4, no. 1: 256-274.