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  • 1
    Electronic Resource
    Electronic Resource
    Postirradiation Reactions of Monomer in Poly(methyl methacrylate): Analysis by CP/MAS 13C NMR (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 5948-5949 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00099a003
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  • 2
    Electronic Resource
    Electronic Resource
    Yields and decay kinetics of the solvated electron in pulse radiolysis of 1-alkanols
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 21 (1983), S. 509-518 
    Details
    ISSN: 0146-5724
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-5724(83)90006-7
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  • 3
    Electronic Resource
    Electronic Resource
    Reaction parameters of the solvated electron in diffusion controlled reactions in polar solvents
    Amsterdam : Elsevier
    Chemical Physics Letters 73 (1980), S. 465-468 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(80)80696-8
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of the carbon chain length on the diffusion-controlled reactions of the solvated electron with polycyclic aromatic hydrocarbons in 1-alkanols at 298 K (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 3837-3841 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150661a030
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of some proprietary soft lining materials (1995)
    Springer
    Journal of materials science 6 (1995), S. 647-652 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The physical and mechanical properties of a series of commercial denture soft lining materials have been investigated. The materials were selected to provide a representative sample of the materials widely used for this application. A total of seven products were evaluated including established and widely used acrylic and silicone materials as well as newer polyphosphazine and fluoroelastomer materials. The objective of the study was to determine minimally acceptable and desirable levels for each property which could be used as criteria or standards for the selection of proposed new materials. The results identified several areas requiring attention and future work. In particular, the importance of using fully-water-equilibrated specimens was emphasized for acrylic polymers where large property changes occurred between wet and dry conditions, and in the case of the polyphosphazine materials where the long time required for full equilibration may lead to understimates of the changes involved. Based upon the properties as measured, recommendations for appropriate standard level for each property are offered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123446
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of commercial soft liners by dynamic mechanical analysis (1995)
    Springer
    Journal of materials science 6 (1995), S. 218-222 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Although there is a significant clinical interest in suitable polymer-based soft liners, none have proven fully satisfactory in actual use. As a result there has been continued interest in the development of new materials. One major weakness in the development of improved materials has been the lack of clear understanding of structure/property relationships. This paper deals with the determination of visco-elastic properties such as E′ (Storage modulus) and tan δ (damping factor) of four commercial materials. They represent the broad range of chemical types available for denture base soft liners. A DMA study of four materials: (1) Molloplast B (silicone); (2) Novus (phosphazine); (3) Kurepeet (fluropolymer); and (4) Super Soft (acrylic) was made using a Perkin-Elmer DMA-7. Samples were made following the manufacturers' instructions, in the form of sheets 1.5 mm thick and 15.0 mm square. The samples were tested compressively using a 3 mm flat tip probe cycled at a frequency of 1 Hz. Wet and dry specimens were evaluated for E′ and tan δ over a 5–95°C temperature range. Water sorption was determined gravimetrically at 37°C. Changes in E′ between the wet and dry conditions for Molloplast (B), Kurepeet and Super Soft were insignificant. A significant increase in tan δ for wet Novus was observed, suggesting that the material is capable of dissipating more energy. The ‘wet’ modulus (E′) is about 42% lower than the “dry” modulus (E′). This difference may be attributed to the very high water sorption (34%) of Novus. i.e. the significant decrease in E′ indicates plasticization due to sorbed water. Changes in visco-elastic properties seem to occur for materials which take up large amounts of water at 37°C. DMA is found to be a useful supplement for the evaluation of soft lining materials in conjunction with the standard mechanical test methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146859
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic mechanical analysis and water sorption of some experimental elastomeric soft lining materials (1996)
    Springer
    Journal of materials science 7 (1996), S. 237-240 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: This research was undertaken to develop a better understanding of the relationships among the compositions, structures and properties of denture soft liners. Five butadiene-styrene-acrylic elastomers were prepared. They were prepared using 50% of powdered prepolymerized butadiene-styrene polymer combined with 50% of a methacrylate monomer (HMA or EHMA) plus varying amounts of initiator and crosslinker. The mixtures were gelled and processed conventionally. Specimens were then committed to dynamic mechanical analysis and water sorption. Dynamic mechanical analysis was performed over the temperature range 5–95°C at the rate of 2.5°C/min using a Perkin Elmer DMA-7 with 3 mm flat tip probe at 1 Hz. Wet and dry values for storage modulus (E') and damping factor (tan δ) were determined at 37°C. Water sorption of these butadiene styrene elastomer-acrylic systems from solutions of varying concentrations was measured in order to establish the role of osmotic pressure. Diffusion coefficient (D d) was determined from the desorption values. The relatively lower values of D d observed in most highly concentrated solutions particularly 1 m sodium chloride and glucose may be interpreted as related to reduced water sorption from these solutions. Increasing crosslinking increased the modulus and decreased water sorption. Using hydrophobic EHMA instead of HMA reduced water uptake, reduced dry modulus and reduced the decrease in modulus caused by water sorption. Dynamic moduli and water sorption generally exceeded those of the commercial materials studied. For all experimental materials, water uptake from saline and glucose solutions confirmed that the diffusion process is osmotically driven.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00119737
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of composition on the mechanical properties and water sorption of a butadiene/styrene copolymer-methacrylate monomer soft lining material (1996)
    Springer
    Journal of materials science 7 (1996), S. 245-250 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: A series of experimental soft lining materials has been produced using a butadiene/styrene copolymer with methacrylate monomers, and assessed in terms of their tensile properties. Three different methacrylate monomers, n-hexyl (HMA), ethyl hexyl (EHMA) and 1-tridecyl (TDMA), and two different initiators, benzoyl peroxide (BP) and lauryl peroxide (LP), were used. Other variables were copolymer/monomer ratio and level of cross-linking. Water sorption studies were also carried out on some of the materials, selected in terms of strength, on the pure copolymer (with and without partitioning agent) and on homopolymers of HMA and EHMA. Generally, the EHMA-based materials had the highest strengths and the TDMA the lowest. The highest tensile strength at 11.36±1.80 MPa was produced by the 50/50, LP initiated EHMA material with 1% cross-linking agent, which also had the lowest water uptake. There appeared to be a relationship between tensile strength and water uptake. Water uptake was found to be governed by the partitioning agent in the copolymer powder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00119739
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of hydrogen bonding on properties of BIS-GMA analogues (1997)
    Springer
    Journal of materials science 8 (1997), S. 283-286 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The influence of chemical structure on the important properties of composite matrix resins is being systematically investigated. This study addresses the relationships between pendent side chain structures, viscosity and curing shrinkage. In particular, viscosity is known to be greatly influenced by intermolecular interactions, such as hydrogen bonding, and free volume effects. In order to establish the relative importance of these factors, analogues of BIS-GMA were synthesized in which the pendent hydroxyl groups were replaced by trimethyl siloxyl, and by dimethyl, isopropyl siloxyl groups. The viscosities were determined with a cone and plate viscometer and curing shrinkages were determined gravimetrically. They were compared to previously determined values for BIS-GMA and its methyl and hydrogen substituted analogues. The high viscosity of BIS-GMA is drastically reduced by replacement of the hydroxyl group, or its substitution by silylation. The relatively smaller effects produced by varying the bulk of the substituted side chains indicates that the main effect on viscosity is due to the presence or absence of hydrogen bonding. Conversely, increasing the bulk of the side chain substituent has less effect on viscosity, but significantly reduces the curing shrinkage. Changes in curing shrinkages were explained in terms of effects of free volumes associated with the monomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018508227774
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  • 10
    Electronic Resource
    Electronic Resource
    Structure property relationship among novel dental composite matrix resins (1997)
    Springer
    Journal of materials science 8 (1997), S. 385-389 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Several novel dimethacrylate monomers of propoxylated diphenols have been synthesized to establish a correlation between their structure and the important properties of viscosity, curing shrinkage and wetting behaviour. These dimethacrylates were designed to possess linear and flexed structures. These new monomers exhibited very much lower viscosities compared to the conventionally used Bis-GMA. Good correlations were obtained for variations of the monomer structures with bulk viscosities and curing shrinkages. However, the wetting behaviour of these resins did not show any trend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018541102275
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