Adhesion Phenomena in the Bonding of Rubber to Metal by Means of Lei˘konat Bonding Agent. 2. Unfilled Vulcanized Rubber

1960 ◽  
Vol 33 (3) ◽  
pp. 757-762
Author(s):  
B. V. Deryagin ◽  
S. K. Zherebkov ◽  
A. M. Medvedeva
Keyword(s):  
Bond Strength ◽  
Bonding Agent ◽  
Vulcanized Rubber ◽  
Polar Groups ◽  
Factors Influencing ◽  
Metal Interfaces

Abstract 1. The bond strength of vulcanized rubber to metal brought about by means of a bonding agent film is regulated by the ratio of the intensities of interaction of the bonding agent film with the contacting surfaces at the bonding agent- rubber and bonding agent-metal interfaces. Where these are approximately equal the bond strength is greatest. Where they differ sharply the bond strength decreases. 2. One of the factors influencing the intensity of interaction of a bonding agent film with vulcanized rubber is a reduction in the thickness of the bonding agent film ; with reduction in the thickness of the bonding agent film the intensity of interaction of the bonding agent with the vulcanized rubber falls; this is expressed in varying ways in the bond strength to metal of vulcanizates of various rubbers, causing a fall-off in some cases, and in some other cases a certain increase in the bond strength of the vulcanized rubber to the metal. 3. By means of the Lei˘konat bonding agent it is possible to bond unfilled vulcanizates based on the majority of existing polymers, whether polar or non-polar, to metal sufficiently strongly. 4. It is established that on increasing the number of polar groups in the polymer there is an increase in the intensity of interaction of the bonding agent film with the vulcanizate containing that rubber.

scholarly journals To Evaluate Shear Bond Strength of Resin Composite to Theracal Lc, Biodentine, and Resin–Modified Glass Ionomer Cement and Mode of Fracture: An In Vitro Study

2020 ◽  
Vol 8 (02) ◽  
pp. 49-54
Author(s):  
Salil Mehra ◽  
Ashu K. Gupta ◽  
Bhanu Pratap Singh ◽  
Mandeep Kaur ◽  
Ashwath Kumar
Keyword(s):  
Statistical Analysis ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Bonding Agent ◽  
Glass Ionomer ◽  
Universal Adhesive ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

Abstract Introduction The aim of the current study was to evaluate shear bond strength of resin composite bonded to Theracal LC, Biodentine, and resin-modified glass ionomer cement (RMGIC) using universal adhesive and mode of fracture. Materials and Methods A total of 50 caries-free maxillary and mandibular molars extracted were taken; occlusal cavities were prepared, mounted in acrylic blocks, and divided into five groups based on the liner used. Group 1: Biodentine liner placed into the cavity and bonding agent and resin composite applied after 12 minutes. Group 2: Biodentine liner placed into the cavity and bonding agent and resin composite applied after 14 days. Group 3: RMGIC liner placed into the cavity and bonding agent and resin composite applied immediately. Group 4: RMGIC liner placed into the cavity and bonding agent and resin composite applied after 7 days. Group 5: Theracal LC liner placed into the cavity and bonding agent and resin composite applied immediately. Each sample was bonded to resin composite using universal adhesive. Shear bond strength analysis was performed at a cross-head speed of 0.1 mm/min. Statistical Analysis  Statistical analysis was performed with one-way analysis of variance and posthoc Bonferroni test using SPSS version 22.0. Results and Conclusion Biodentine liner when bonded immediately to resin composite showed minimum shear bond strength. RMGIC when bonded to resin composite after 7 days showed maximum shear bond strength. Mode of fracture was predominantly cohesive in groups having Biodentine and Theracal LC as liner.

Methods for Determination of Rubber to Cord Bond Strength

1959 ◽  
Vol 32 (3) ◽  
pp. 898-906
Author(s):  
R. V. Uzina ◽  
L. S. Gromova ◽  
S. A. Vasil'eva
Keyword(s):  
Bond Strength ◽  
Laboratory Method ◽  
Single Thread ◽  
Vulcanized Rubber ◽  
Pull Out ◽  
Cord Fabric ◽  
Fabric Structures

Abstract In selecting methods for determination of rubber to cord bond strength it is necessary to consider the factors which are subject to variation in the system— the type of cord, the composition of the vulcanized rubber, or the composition of the impregnant. The selection (composition) of the methods of assessment of bond strength was carried out in the present study while keeping the type of cord and the rubber compositions constant ; only the composition of the impregnant was varied. Up to the present there has been no single laboratory method for evaluating rubber to cord bond strength for the determination of the service quality of rubber-fabric structures. The bond strength in such a system is assessed in the majority of cases by the use of a series of methods. The existing methods may be systematized according to the nature of the deformation (static or dynamic), the nature of the specimen (with single thread of cord or with cord fabric) and so on. We adopted the following classification of methods: 1). Determination of bond strength of a single thread of cord with the rubber; 2). Determination of bond strength of rubber to fabric model specimens. Determination of bond strength of a single thread of cord with rubber is an exceptionally widely used type of testing in the rubber industry. It is based either on the principle of stripping of a single thread of cord from the rubber under pressure, or on the principle of pull-out of a thread of cord from a rubber specimen.

The Effect of Three Variables on Shear Bond Strength When Luting A Resin Inlay to Dentin

10.2341/08-82 ◽  
2009 ◽  
Vol 34 (3) ◽  
pp. 288-292 ◽  
Author(s):  
J-I. Lee ◽  
S-H. Park
Keyword(s):  
Bond Strength ◽  
Clinical Relevance ◽  
Shear Bond Strength ◽  
Bonding Agent ◽  
Dentin Surface ◽  
Luting Material

Clinical Relevance In order to maximize the bond strength of a resin inlay to dentin, the exposed dentin surface should be sealed with DBA before taking an impression. In addition, the bonding agent should be gently air dried and light cured before applying the luting material.

Influence of Surface Condition, Duration of Molding, Pressure and Temperature upon Bond Strength between Components of Tire Casings

1959 ◽  
Vol 32 (2) ◽  
pp. 503-512
Author(s):  
V. A. Pinegin ◽  
S. A. Vasil'eva ◽  
L. M. Kepersha
Keyword(s):  
Bond Strength ◽  
Surface Condition ◽  
Bonding Agent ◽  
Molding Pressure ◽  
Specific Pressure ◽  
Duration Of Action ◽  
Uniform Layer ◽  
Synthetic Rubber

Abstract As a result of the above experiments it is shown that the bond strength between components of casings where 100% synthetic rubber is used, may be significantly increased: 1) by maintaining the freshness of the surfaces being plied up by keeping standing to a minimum, by freshening the surfaces by fine (‘velvet’) buffing, and by applying a thin and uniform layer of bonding agent to the previously heated surfaces; 2) by increasing the specific molding pressure during plying up; 3) by increasing the specific pressure upon the constructions during vulcanization; 4) by increasing the duration of action of the specific molding pressure during plying up; 5) by raising the temperature of the components being plied up. The rational exploitation of these points undoubtedly has an important effect and will ensure the improvement of the quality of the finished articles, particularly where 100% synthetic rubber is used.

Sign in / Sign up

Export Citation Format

Share Document