WorldCat Identities

Gent, Alan N.

Overview
Works: 65 works in 111 publications in 2 languages and 930 library holdings
Roles: Author, Editor
Classifications: TA455.R8, 620.194
Publication Timeline
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Most widely held works about Alan N Gent
 
Most widely held works by Alan N Gent
Engineering with rubber how to design rubber components by Alan N Gent( )
36 editions published between 1992 and 2012 in English and German and held by 855 WorldCat member libraries worldwide
This book provides the beginning engineer with the principles of rubber science and technology: what rubber is, how it behaves, and how to design engineering components with rubber. It introduces the reader to the principles on which successful use of rubber depends and offers solutions to the questions engineers in rubber processing face every day: - How is an elastomer chosen and a formulation developed - Why is rubber highly-elastic and relatively strong - How to estimate the stiffness and the strength of a product - How to guarantee high quality and durability The authors describe current practices in rubber engineering. At the end of each chapter, sample questions and problems (together with solutions) are provided, allowing the reader to gauge how well he/she has mastered the material. Contents: - Materials and Compounds - Elasticity - Dynamic Mechanical Properties - Strength - Mechanical Fatigue - Durability - Design of Components - Finite Element Analysis - Test and Specifications
The Role of Chemical Bonding in Adhesion ( Book )
7 editions published between 1977 and 1985 in English and held by 7 WorldCat member libraries worldwide
Progress in three different phases of our study of the role of chemical bonding in adhesion is summarized in this report. Phase one consisted of physical properties of model filled elastomers consisting of polybutadiene with glass beads incorporated. A series of glass beads of different sizes and with different surface treatments were used. The results were compared with those for other systems taken from the literature and with theoretical predictions. Phase two consisted of a study of the adhesion between two similar or dissimilar elastomer layers, differing either in initial degree of crosslinking or in chemical reactivity. Phase three consisted of a study of the role of amines in the adhesion of cured polybutadiene to substrates. (Author)
Mechanics of Viscoelastic Composites ( Book )
3 editions published between 1968 and 1969 in English and held by 3 WorldCat member libraries worldwide
Apparatus has been developed to measure the dynamic mechanical properties of foamed materials filled with a viscous fluid, over a frequency range from 0.002 to 200 Hz and a temperature range from -50 o C to +100 o C. Measurements have been made on various foam/ fluid systems including rubber latex, polyether and polyester foams filled with air, glycerin, silicone oil and water. The Gent-Rusch theory has been modified to take into account inertia effects, damping in the matrix material itself, and special features of the text-piece assembly . The theory is shown to describe the measurements successfully and verifies the engineering validity of the approach outline. (Author-PL)
Mechanics of viscoelastic composites by Alan N Gent( Book )
2 editions published between 1969 and 1974 in English and held by 2 WorldCat member libraries worldwide
Molecular structure and physical behavior of polymers ( Book )
2 editions published between 1962 and 1963 in English and held by 2 WorldCat member libraries worldwide
Stress-temperature relations wer inve tig ted for linear polyet ylene, crosslink d to varying extents by gamma irradiation, and subjected o elo gation of varying amount. The incipient crystallization t mperature T sub c was foun to be reduced o ly slightly over th range of crosslinking employ d, in me sureme ts at small xt nsions. The application of moder te extensions brought about somewhat l rger increases in T sub c. T HE INCRE SE W S L RGER FOR THE MORE IGHLY CORSSLINKED MATERIALS, O THAT A REVERSAL OF THE T sub c values appeare to occur at exten ions of about 250%. Stress changes o cryst lliza ion under isother al conditio s was examined. Stress increases were observed, co fir ing that they ar not ue solely to therm l contraction. Str ss-temperature relatio s w re determin d for crosslinked balata Clear indications of the melting of the bet crystal form were obt i ed; they suggest ha both cry tal forms can occur in oriented bundle cryst llit s S OME STUDIES HAVE BEEN CARRIED OUT ON THE CHAIN TRA SFER REACTION BETWEE POLYSTYRYL LITHIUM AN TOLUENE OR CUMENE. (ut or) D -<($ %($(N2 +++Molecular tructure and physical behavior of polymers. Stress change nd cry t llization in crosslinked polyet ylene and trans-polyisoprene BALATA) Structur of nionic polystyrene
Science of adhesion by Alan N Gent( Book )
2 editions published between 1983 and 1984 in Undetermined and English and held by 2 WorldCat member libraries worldwide
Force-deflection relations for a model air spring by Alan N Gent( )
1 edition published in 1974 in English and held by 1 WorldCat member library worldwide
Threshold Tear Strength of some Molecular Networks ( Book )
1 edition published in 1981 in English and held by 1 WorldCat member library worldwide
The tear strength of polydimethylsiloxane (PDMS) networks was found to be only about one-third as large as that of polybutadiene (PB) or polyisoprene (PI) networks of similar M sub c when the tear strength was measured under threshold conditions, i.e., at high temperatures, low rates of tearing, and with swollen samples. This striking difference in strength is attributed to the smaller length and extensibility of PDMS molecules in comparison with PB or PI molecules of the same molecular weight. Networks formed by trifunctional or tetrafunctional endlinking reactions with difunctional PDMS polymers were found to be only slightly stronger under threshold conditions, by up to 30 per cent, than PDMS networks formed by random crosslinking to the same M sub c. Endlinked PB networks were found to have substantially the same threshold strength as randomly-linked PB networks of the same M sub c. Thus, the threshold tear strength does not appear to depend strongly upon the uniformity of network strand lengths. (Author)
Effect of Interfacial Bonding on the Strength of Adhesion of Elastomers, I. Self-Adhesion ( Book )
1 edition published in 1981 in English and held by 1 WorldCat member library worldwide
Two partially-gelled (crosslinked) layers of elastomer were pressed into intimate contact and the gelation reaction was then taken to completion. By varying the extent of initial gelation, the degree of chemical interlinking was varied from zero, when two fully-reacted sheets were pressed together, up to a level characteristic of the final density of molecular linking within each layer, when they were brought together before any reaction had occurred. The strength of adhesion between the layers was measured under threshold conditions, i.e., at low rates of peel, at high temperatures, and, in some instances, with the layers swollen with a compatible liquid. Linear relations were obtained between the threshold work of detachment per unit of interfacial area and the amount of chemical interlinking, deduced from the kinetics of molecular linking within each layer. At any degree of interlinking, ranging from zero to the fully interlinked state, the work of detachment was lower for networks composed of shorter molecular chains, in accordance with the Lake-Thomas theory of the threshold strength of elastomer networks. By extrapolation to the fully-interlinked state, the strength of adhesion corresponding to cohesive rupture was inferred. These values agreed with measured tear strengths for polybutadiene gelled by a free-radical process. For a sulfur crosslinking system, and for both free-radical and sulfur crosslinking of poly(ethylene-co-propylene), the threshold tear strength of the elastomer was found to be much higher than the extrapolated value from adhesion measurements
The Role of Chemical Bonding in the Adhesion of Elastomers ( Book )
1 edition published in 1981 in English and held by 1 WorldCat member library worldwide
A review is given of several studies of the effect of interfacial bonding upon the mechanical strength of an adhesive joint. In the first, polybutadiene layers were crosslinked by a free radical process whilst in contact with silane-treated glass. A direct proportionality was found between the minimum peel strength of the joint, as high temperatures and low rates of peeling, and the vinyl content of the silane treatment liquid. Covalent bonding between the diene polymer and vinyl groups on the treated glass was inferred. When radioactivity tagged silanes were employed, extensive combination with the glass substrates was demonstrated. Again, the greater the amount of vinyl silane found on the treated glass surface, the greater the mechanical strength of adhesion between the treated glass and a polybutadiene overlayer. In another series of experiments two partially-crosslinked sheets of polybutadiene were pressed together before the crosslinking was taken to completion. The additional crosslinking was determined from measurements of the elastic properties and of the degree of equilibrium swelling by a compatible liquid. Again, the mechanical strength of adhesion between the two sheets under threshold conditions was found to be directly proportional to the inferred degree of interfacial interlinking
The Role of Molecular Diffusion in the Adhesion of Elastomers ( Book )
1 edition published in 1984 in English and held by 1 WorldCat member library worldwide
Butyl rubber (polyisobutylene-co-isoprene) mixed with polyisobutylene was crosslinked to yield elastomeric macromolecular networks containing dissolved linear macromolecules. Adhesion of these materials to themselves (self-adhesion) and to an inert substrate was investigated over a wide range of peel rates and test temperatures. Greatly enhanced self-adhesion was found when linear polyisobutylene molecules of high molecular weight were present, but the strength of adhesion to a rigid inert substrate was hardly affected
Effect of Oxygen on the Tear Strength of Elastomers ( Book )
1 edition published in 1989 in English and held by 1 WorldCat member library worldwide
Rates of tearing under steady and intermittent loads have been measured for some representative elastomers. The rate depended strongly upon the load and also upon the environment. Tearing was strongly upon the load and also upon the environment. Tearing was much slower for SBR and BR vulcanizates in vacuo, especially at low loads, by a factor of up to 10X. For NR the effect was quite small by a factor of 2X at the most. Experiments were also carried out in the presence of thiophenol vapor, a radical trap. For NR, the effect was found only at high loads, when tearing was much slower, by a factor of about 10X. The improvement persisted after thiophenol was removed it is attributed chemical modification of the vulcanizate. On the other hand, tearing of SBR was accelerated at all loads by thiophenol vapor, to the same degree as in air. Much smaller effects were found for a peroxide vulcanizate off SBR. It is concluded that the reactions of sulfur crosslinks with radical acceptors, including oxygen, lead to an increased rate of tearing in SBR. For BR and NR vulcanizates the situation is less clear, because of the smaller effect of oxygen in the first case and of thiophenol in the second. Keywords: Fatigue; Crack growth. (KR)
Developments in engineering applications of rubber by Alan N Gent( Book )
1 edition published in 1961 in English and held by 1 WorldCat member library worldwide
Diffusion and Equilibrium Swelling of Macromolecular Networks by Their Linear Homologs ( Book )
1 edition published in 1982 in English and held by 1 WorldCat member library worldwide
Polydimethylsiloxane (PDMS) networks having strands of molecular weight in the range 11,000-36,000 have been prepared by endlinking linear PDMS molecules of these molecular weights with a tetrafunctional linking agent. Absorption of a series of homologous linear PDMS molecules by the resulting PDMS networks has been investigated. The diffusion coefficients at 70 deg were found to be rather large, 1x10 to the minus 12th power - 6x10 to the minus 12th power m(2)/s, and approximately inversely proportional to the molecular weight of the diffusion liquid, over the range 5,000-38,000. the amounts of liquid absorbed at equilibrium was relatively small, 10% - 80% in good agreement in all cases with an especially simple version of the Flory-Huggins theory when the heat of mixing is made vanishingly small and only entropic terms are retained
The Effect of Strain upon the Velocity of Sound and the Velocity of Free Retraction for Natural Rubber ( Book )
1 edition published in 1982 in English and held by 1 WorldCat member library worldwide
Measurements have been made of the velocity of sound and the velocity of free retraction for stretched strips of vulcanized natural rubber. Both of these velocities are found to increase markedly with increasing strain, in agreement with earlier work. The velocity of sound is shown to be related to the appropriate modulus of elasticity, defined by the slope of the curve relating true stress to tensile strain. Values obtained range from about 50 to about 800 m/s. The effects of prior stretching and of stress relaxation on the velocity of sound are shown to arise from corresponding changes in the modulus of elasticity at a given strain. The velocity of free retraction is shown to be directly related to the velocity of sound in the stretched strip, and to the imposed tensile strain, increasing from zero up to about 100 m/s at high strains. (Author)
An IETS (Inelastic Electron Tunneling Spectroscopy) Study of Surface Reactions Applicable to Adhesion ( Book )
1 edition published in 1988 in English and held by 1 WorldCat member library worldwide
Inelastic electron tunneling spectroscopy (IETS) has been used to study two classes of adhesion promoting compounds adsorbed on alumina: trialkoxysilanes and phosphonic acids. It has been shown that both types of compounds can condense directly with hydroxyl groups on the surface. Condensation is through the alkoxy groups in the case of the silanes and through the hydroxyl groups in case of the acids. The silanes can further condense to form surface siloxanes. The absence of bands characteristic of the phosphoryl group in the spectra of the acids is indicative of resonance bond formation followed by ionic bonding to the surface. Keywords: Adhesion, Aluminum, Bonding, Coupling agents, Corrosion inhibitors, Phosphonic acids, Silanes, Spectroscopy, Surface reactions
Adhesion of Elastomers to Rigid Substrates--Three Substrates with Unexpectedly High Adhesion ( Book )
1 edition published in 1977 in English and held by 1 WorldCat member library worldwide
An unexpectedly high level of adhesion has been observed for simple hydrocarbon elastomers applied to certain glassy substrates: polyphenylene oxide, polysulfone and polycarbonate. The force required to separate an elastomer layer from these substrates was more than six times larger than for other glassy substrates, e.g., polystyrene and polyethyleneterephthalate. The origin of this anomalously high adhesion is not known. (Author)
Compression of Rubber Layers Bonded Between Two Parallel Rigid Cylinders or Between Two Rigid Spheres ( Book )
1 edition published in 1985 in English and held by 1 WorldCat member library worldwide
The stiffness of bonded rubber blocks under small compressive deformations has been studied extensively. A recent review deals with the problem in connection with the use of elastomeric laminaes as bridge bearings. However, previous studies have been mainly concerned with a flat rubber block bonded between two flat rigid plates. An approximate treatment is given here for the stiffness of a rubber layer bonded between two opposed curved rigid surfaces, cylindrical or spherical in shape. The predictions of the theoretical treatment are then compared with measured values of compressive stiffness for various initial separations (and hence rubber layer thicknesses) of the two rigid surfaces, relative to their diameter. Keywords: Bonded layers; Compression; Cylinders; Deformation; Elastic; Pressure; Rubber; Spheres; Stiffness; and Stress Analysis
Effect of Interfacial Bonding on the Strength of Adhesion of Elastomers. III. Interlinking by Molecular Entanglements ( Book )
1 edition published in 1984 in English and held by 1 WorldCat member library worldwide
Polydimethylsiloxane (PDMS) networks have been formed by endlinking linear PDMS molecules. When second layer is cast on top of a fully-gelled lower-layer, the new molecules diffuse into the surface of the lower layer and form molecular loops ('entanglements') in the course of endlinking with themselves. The two layers are then joined only by the macromolecular loops. Measurements have been made of the work required to separate such layers under threshold conditions, i.e., at low rates, high temperatures, and, in some cases, in the swollen state. Values of the work of detachment have been found to be generally about one-half of the work of fracture of the layers themselves, and consistent with the inferred density of interlinking molecular loops at the interface. The values were higher for higher densities, roughly in proportion, and for interlinking molecular strands of higher molecular weight, in accordance with the theory of Lake and Thomas. In the absence of interlinking the work of detachment was extremely small
Chemistry of Silane Coupling Reactions. II. Reaction of Dimethylmethoxysilanated Poly(butadiene) with Triethylsilanol and with Glass ( Book )
1 edition published in 1978 in English and held by 1 WorldCat member library worldwide
Poly(butadiene) having a dimethylmethoxysilane endgroup has been found to react with a model silanol, triethylsilanol, in the same way as a simple silane does, yielding the addition product, methanol, and dimers of the two starting materials. This reaction takes place readily at room temperature in benzene solution. A corresponding addition reaction between silanated poly(butadiene) and the OH groups present on the surface of glass has therefore been inferred. This is corroborated by a greater degree of retention of silanated poly(butadiene) compared to unsilanated poly(butadiene) on glass slides subjected to thorough washing, and by direct observation of polymer particles, about 0.3 micrometer in size, adhering to the glass treated with silanated poly(butadiene). (Author)
 
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Alternative Names
Gent, A. N.
Languages
English (63)
German (3)
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