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Effect of Heating Rate on Glass Transition of a Cross-linked Denture Base Resin
Vjekoslav Jerolimov
; Klinički Zavod za protetiku, Klinička bolnica Dubrava,Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Robert G. Jagger
; Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, Wales, UK
Paul J. Millward
; Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, Wales, UK
Vlado Carek
; Klinički Zavod za protetiku, Klinička bolnica Dubrava,Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
The purpose of the study was to investigate the effect of different heating rates in the evaluation of the transition glass temperature of a dough-moulded poly(methylmethacrylate) denture base material Cross-linking agent ethylene glycol dimethacrylate (EGDMA) was added to the MM A monomer component: in concentration of 10% by volume. The polymer component was an unpigmented PMMA homopolymer. A comparison group of specimens was made by use of monomer liquid without any cross-linking agent. Specimens were produced in moulds according to conventional dental flasking and curing procedures. Measurements of Tg were determined by thermomechanical analysis using a Stanton Redcroft TMA, Model 790 (PL Thermal Science Ltd., Epson, UK). Heating rates of 5 °C/min, 10 °C/min and 15 °C/min were selected for this investigation. It was concluded that the addition of cro- os-linking agent would affect Tg denture base resins. Tg values were highly dependent on the heating rates used in thermomechanical analysis, being very significantly increased with a heating rate increase.
Ključne riječi
denture base acrylic resins; cross linking; glass transition temperature; heating rate
Hrčak ID:
98643
URI
Datum izdavanja:
15.12.1996.
Posjeta: 936 *