Results 231 to 240 of about 22,448 (261)

Crosslink Density Evaluation of EPDM Vulcanizates

Rubber Chemistry and Technology, 1971
Abstract Crosslink density of EPDM vulcanizates, both gum and filled, has been evaluated from stress-strain measurements on both dry and swollen samples, by plotting the data according to the Mooney-Rivlin diagram. Values of the C1 constant of swollen specimens were generally found to be much higher than those of the dry ones, and the ...
V. Zamboni, U. Flisi, G. Giunchi
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Complexities of Crosslink Density in Filled Elastomers

Rubber Chemistry and Technology, 1965
Abstract This work was undertaken to learn more about the complicated role of fillers in reinforcing siloxane polymers and attempt to clarify why silica fillers cause the crosslink density to increase significantly more in siloxane polymers than in hydrocarbon polymers.
K. E. Polmanteer, J. D. Helmer
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Crosslink Density of Peroxide Cured TPV

Macromolecular Symposia, 2006
AbstractEPDM/PP model compounds were dynamically vulcanized by use of varying amounts of an organic peroxide and a trifunctional methacrylate to produce thermoplastic vulcanizates (TPV) materials with different properties. Tensile strength and ultimate elongation as well as compression set data of these materials are comparable to existing commercial ...
Norbert Vennemann, Klaus Bökamp, Dirk Bröker   +2 more
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Effective crosslinking densities and elastic moduli of some physically crosslinked hydrogels

Polymer, 1995
Abstract Samples of poly(N-vinyl-2-pyrrolidone (VP)-co-methyl methacrylate (MMA)), containing 41–76.5 wt% MMA, have been prepared by a controlled, semicontinuous copolymerization procedure and swollen to equilibrium in water at various temperatures T (283–343 K) to yield hydrogels in which the network structure is maintained by physical crosslinking ...
Yan Liu, Malcolm B. Huglin
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Influence of selected components on crosslink density in polymer structures

European Journal of Oral Sciences, 2001
Bifunctional methacrylates polymerize to form crosslinked polymer structures which may be characterized by the quantity of remaining double bonds and by the crosslink density. This study investigated the influence of composition variation on the crosslink density of model methacrylate polymers.
Asmussen, E., Peutzfeldt, A.
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Physical and Chemical Consequences of Keratin Crosslinking, with Application to the Determination of Crosslink Density

1977
The high levels of covalent disulfide crosslinking in keratins strongly affect (1) structural stability, (2) viscoelasticity, and (3) chemical reactivity. This paper briefly reviews recent work on these subjects, with critical emphasis on methods by which chemical and physical properties can be related to inter-and intra-molecular crosslink density in ...
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Influence of curing modes on crosslink density in polymer structures

Journal of Dentistry, 2004
This study investigates the influence of curing modes on the crosslinking density of dental composites.A light-cure unit (BISCO VIP) that allowed for independent command over time and intensity was selected. Four different light-curing modes with constant light energy density were investigated (control (C), pulse delay (PD), soft-start (SS) and pulse ...
Soh, M.S., Yap, A.U.J.
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Crosslink Density of Elastomers. A New Gas-Chromatographic Method

Rubber Chemistry and Technology, 1974
Abstract Information concerning the state or degree of vulcanization of rubber products is often desired. This is because most products are compounded and cured to a specific hardness or modulus depending on the end use. For example, stocks used in mechanical goods usually have a higher hardness than goods where fatigue resistance is important,
C. R. Parks, R. J. Brown
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High‐resolution NMR of crosslinked polymers: Effects of crosslinked density and solvent interaction

Journal of Polymer Science Part A-1: Polymer Chemistry, 1967
AbstractMeasurements have been made of the dependence of nuclear magnetic resonance bandwidths of polymers on the degree of crosslinking. Poly(methyl methacrylates) and poly(hexadecyl acrylates) were studied. Three regions of behavior are apparent: (1) in lightly crosslinked materials, bandwidths are quite insensitive to the degree of crosslinking, and
Kang‐Jen Liu, William Burlant
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Molecular modeling of crosslinked epoxy polymers: The effect of crosslink density on thermomechanical properties

Polymer, 2011
Molecular dynamics and molecular mechanics simulations are used to establish well-equilibrated, validated molecular models of the EPON 862-DETDA epoxy system with a range of crosslink densities using a united atom force field. Molecular dynamics simulations are subsequently used to predict the glass transition temperature, thermal expansion ...
Ananyo Bandyopadhyay, Pavan K. Valavala, Thomas C. Clancy, Kristopher E. Wise, Gregory M. Odegard   +4 more
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