Bonding at Interfaces

Plueddemann has recently published a book on the subject of silane coupling agents. According to Plueddemann and references cited in his book, the mechanism of action of silane coupling agents involves not just interfacial reactivity, but also the formation of an interpenetrating polymer network between a polysiloxane surface layer and the overlying polymer. 

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We thus see that, as for the time-resolved nonlinear IR methods, sum-frequency vibrational spectroscopy is a valuable tool to convey information on H-bonds, particularly H-bonds at interfaces. 

Thus, the first questions posed in studying the strength of elastomers (and other materials as well) are where and under what conditions does fracture begin Also, what laws govern the growth of a crack once it has been initiated This chapter seeks to answer such questions, first in a general way and then with particular reference to important modes of failure of elastomers in service. It does not deal with the rather complex problem of the strength of composite structures, such as a pneumatic tire, which involves failure of adhesive bonds at interfaces between the components as well as fracture of the components themselves. 

Interface defects are largely caused by inadequate conditions for generating bonds at interfaces between fibres and matrix and between layers of composites during manufacturing. If resin is infused into a fibre preform, it may not wet the entire fibre... 

The curing and dynamic properties of precipitated nano-silica on NR without and with the sulfur addition (NR with S), synthetic polyisoprene (IR), polybutadiene (BR) and SBR was investigated. Silica was treated with bis(3-triethoxysilylpropyl)tetrasulfane (TESPT) to form bonds at interfaces. Cure, Mooney viscosity, glass transition temperature, bound rubber, crosslink density and DMA were measured. The properties of silica-filled SBR and BR correlated with highest rolling resistance and SBR-silica correlated with best skid resistance. A Payne effect was observed in the loss modulus under some experimental conditions. In addition to possible filler de-agglomeration and network disruption, the nanoscale of the filler may have further contributed to the non-linear response typified by the Payne effect. ... 

Adhesion D E PACKHAM Etymology, usage - qualitative, quantitative, practical, theoretical, bonds at interface... 

The interface assures the structural integrity of the composite material and it represents an important criterion in the design of this type of materials. The correct selection of the components and their adequate processing are prerequisites in the achievement of strong bonds at interface, which, in the last instance, assure the obtaining of a material with structural integrity and good properties. 

Specific adhesion or chemisorption implies that new covalent bonds at interface are created with the help of adhesion promoters (Figure 6.9). These are strong bonds with energies up to 700 kJ mol ... 

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