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- Publisher Website: 10.1016/j.dental.2005.12.004
- Scopus: eid_2-s2.0-33845296983
- PMID: 16430955
- WOS: WOS:000243611800013
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Article: Methyl methacrylate monomer-polymer equilibrium in solid polymer
Title | Methyl methacrylate monomer-polymer equilibrium in solid polymer |
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Authors | |
Keywords | Free-radical Polymer equilibrium Solid-state |
Issue Date | 2007 |
Citation | Dental Materials, 2007, v. 23, n. 1, p. 88-94 How to Cite? |
Abstract | Objective: Poly(methyl methacrylate) (PMMA) is commonly processed in dentistry by thermally initiating the free-radical polymerization of methyl methacrylate (MMA). Residual MMA, a tissue irritant, is a concern. The concentration of MMA ([MMA]) versus time and temperature was studied to identify optimum processing conditions. Materials and methods: One hundred milligram portions of plain and dental PMMA powders were incubated (10-170 °C, 1-384 h), with and without 6.0 μL MMA added. After incubation, [MMA] was determined by GC. Results: For plain PMMA alone, equilibrium was attained in about 100 h. The equilibrium data for log[MMA] versus 1/T was better fitted by a quadratic than a straight line, and formed an upper bound to the values of [MMA] when PMMA was incubated with MMA at temperatures >∼120 °C. The response surface for [MMA] versus log(time) and reciprocal temperature was fitted. An 'overshoot' in the equilibration process was identified, and postulated to be due to a rapidly formed intermediate of unknown chemistry. Significance: Minimization of the residual MMA in acrylic denture bases prepared by processing a mixture of PMMA and MMA is important for reasons of mechanical properties and irritancy. The response surface mapped here allows direct identification of the optimum processing conditions. © 2005 Academy of Dental Materials. |
Persistent Identifier | http://hdl.handle.net/10722/322064 |
ISSN | 2023 Impact Factor: 4.6 2023 SCImago Journal Rankings: 1.186 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Lung, C. Y.K. | - |
dc.contributor.author | Darvell, B. W. | - |
dc.date.accessioned | 2022-11-03T02:23:21Z | - |
dc.date.available | 2022-11-03T02:23:21Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Dental Materials, 2007, v. 23, n. 1, p. 88-94 | - |
dc.identifier.issn | 0109-5641 | - |
dc.identifier.uri | http://hdl.handle.net/10722/322064 | - |
dc.description.abstract | Objective: Poly(methyl methacrylate) (PMMA) is commonly processed in dentistry by thermally initiating the free-radical polymerization of methyl methacrylate (MMA). Residual MMA, a tissue irritant, is a concern. The concentration of MMA ([MMA]) versus time and temperature was studied to identify optimum processing conditions. Materials and methods: One hundred milligram portions of plain and dental PMMA powders were incubated (10-170 °C, 1-384 h), with and without 6.0 μL MMA added. After incubation, [MMA] was determined by GC. Results: For plain PMMA alone, equilibrium was attained in about 100 h. The equilibrium data for log[MMA] versus 1/T was better fitted by a quadratic than a straight line, and formed an upper bound to the values of [MMA] when PMMA was incubated with MMA at temperatures >∼120 °C. The response surface for [MMA] versus log(time) and reciprocal temperature was fitted. An 'overshoot' in the equilibration process was identified, and postulated to be due to a rapidly formed intermediate of unknown chemistry. Significance: Minimization of the residual MMA in acrylic denture bases prepared by processing a mixture of PMMA and MMA is important for reasons of mechanical properties and irritancy. The response surface mapped here allows direct identification of the optimum processing conditions. © 2005 Academy of Dental Materials. | - |
dc.language | eng | - |
dc.relation.ispartof | Dental Materials | - |
dc.subject | Free-radical | - |
dc.subject | Polymer equilibrium | - |
dc.subject | Solid-state | - |
dc.title | Methyl methacrylate monomer-polymer equilibrium in solid polymer | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.dental.2005.12.004 | - |
dc.identifier.pmid | 16430955 | - |
dc.identifier.scopus | eid_2-s2.0-33845296983 | - |
dc.identifier.volume | 23 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | 88 | - |
dc.identifier.epage | 94 | - |
dc.identifier.isi | WOS:000243611800013 | - |