WorldCat Identities

Gent, Alan N.

Overview
Works: 79 works in 126 publications in 3 languages and 960 library holdings
Roles: Author, Editor, Other
Classifications: TA455.R8, 620.194
Publication Timeline
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Most widely held works by Alan N Gent
Engineering with rubber : how to design rubber components by Alan N Gent( Book )

36 editions published between 1992 and 2012 in English and German and held by 330 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 an experimental study of the self-adhesion of thin layers of three crosslinked elastomers; namely, cispolyisoprene (natural rubber) and two polybutadienes. For the polybutadienes, the strength of self-adhesion was found to be strongly dependent upon the time of exposure of the two surfaces to air before they were brought into contact. The same phenomenon did not take place on exposure to nitrogen nor for samples of cis-polyisoprene and it was reduced or delayed in samples containing antioxidant. It was therefore attributed to surface oxidation reactions that can lead to interfacial covalent bonds with polybutadiene but not with polyisoprene. Phase two consisted of a study of the effect of the number of chemical bonds at an interface between glass and polybutadiene on the joint strength of the adhesive bond formed between them
The pneumatic tire( Book )

2 editions published between 2005 and 2006 in English and held by 4 WorldCat member libraries worldwide

MECHANICS OF VISCOELASTIC COMPOSITES( Book )

3 editions published between 1968 and 1969 in English and held by 3 WorldCat member libraries worldwide

An apparatus has been developed for the measurement of the dynamic mechanical properties of foamed materials impregnated with viscous fluids over a wide frequency and temperature range. Preliminary results are given for two foams. Measurements of rolling friction on foam-fluid substrates have also been obtained in two ways for a number of low-density foams. They are compared with the predictions of a simple theoretical treatment of rolling friction on viscoelastic substrates. An analysis is given of the distributions of stress and displacement in solid rubber blocks subjected to small compressions between rigid frictional surfaces. Particular consideration is given to local sliding motions in the outer regions of the loaded surfaces, as a possible means of energy dissipation. Preliminary experimental measurements of the amount of sliding are reported. (Author)
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

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

The Role of Molecular Diffusion in the Adhesion of Elastomers( Book )

2 editions published between 1984 and 1985 in English and held by 2 WorldCat member libraries worldwide

Adhesion of lightly crosslinked sheets of EPDM (ethylene-propylelediene terpolymer) to themselves and to a Mylar substrate has been investigated over wide ranges of peel rate and test temperature. The effect of incorporating ethylene-propylene copolymer (EPR) before crosslinking, to yield a loose macromolecular network containing dissolved linear EPR macromolecules, was also studied. The self-adhesion of these materials was found to be much greater than their adhesion to Mylar, over a wide range of effective peel rates. This is attributed to interdiffusion of EPR and EPDM molecular strands. At extremely low peel rates the enhancement of adhesion was smaller, probably because of back-diffusion, and at high rates, the strength of adhesion became high in all cases. These results are compared to those compared to those obtained previously for polyisobutylene-co-isoprene networks containing linear polyisobutylene molecules. The enhancement of self-adhesion at intermediate rates of peel was considerably greater for the EPDM based materials, probably because of a lower degree of crosslinking and a greater tendency to form molecular entanglements
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
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)
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
Friction and abrasion of aircraft tire tread materials( Book )

1 edition published in 1975 in English and held by 1 WorldCat member library worldwide

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)
Xiang jiao gong cheng by te Zhan( Book )

1 edition published in 2002 in Chinese and held by 1 WorldCat member library worldwide

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
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
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

Heat Build-Up and Blow-Out of Rubber Blocks( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

Rubber blocks heat up under repeatedly-applied severe deformations and sometimes explode ('blow out'). This phenomenon is shown to be due entirely to the high temperatures developed internally, about 200 C, which cause decomposition of the vulcanizate, and generation of a volatile product. When the internal pressure is high enough, the surrounding rubber is torn apart and the sample bursts. The same process can be observed with a microwave oven, when the rubber sample is heated internally, without stress, to the same critical temperature Tc. Values of Tc are reported for different vulcanizates of several elastomers. They are found to be lower for softer materials, in accord with the theory of elastic expansion to burst of internal gas bubbles, and lower for materials having less stable crosslinks; for example, polysulfidic instead of monosulfidic or C-C cross-links. Maximum values of Tc were about 240 C, significantly below the temperatures for rapid decomposition of the elastomers themselves. Possible reasons for this anomaly are discussed. Keywords: Explosive rupture; Fracture(Mechanics); Heating; Thermal decomposition
Threshold Tear Strength of Elastomers( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

Tear strengths have been measured for a wide variety of molecular networks under threshold conditions; i.e., at high temperatures, low rates of tearing, and with swollen samples. For all of the polymers examined, the threshold tear strength was found to be proportional to the square root of the average molecular weight M sub c of network strands, in agreement with theory. However, for the same M sub c and hence for similar values of elastic modulus, different polymers showed major differences in threshold tear strength. The tear strength of polydimethylsiloxane networks was only about one-third as large as that for networks of polybutadiene and cis-polyisoprene and the values obtained for polyphosphazene networks were only about one-fifth as large as the same M sub C. These striking differences are attributed to differences in network strand length and extensibility for the same molecular weight. The threshold tear strengths are shown to be in satisfactory quantitative agreement with theoretically predicted values on this basis. (Author)
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
 
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Engineering with rubber : how to design rubber components
Alternative Names
Alan Neville Gent British scientist

Gent, A. N.

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