Elastomer bonds

In the last part of the paper, filler-elastomer chemical interactions which are able to take place through surface functional groups or surface reactive hydrogens are studied. The effect exerted by the created filler-elastomer bonds in the reinforcement process is then discussed. 

In this connection, Fig. 2 provides a qualitative illustration for interpreting modulus change of an elastomer upon filler blending 9). A hydrodynamic or strain amplification effect, the existence of filler-elastomer bonds, and the structure of carbon black 10) all play a part in this modulus increase. 

It appears, beyond all doubt, that filler-elastomer interactions result in the formation of chemical bonds between the polymer and the solid surface, which are due to a reaction of the macromolecule either with the surface chemical groups or with the surface hydrogen atoms. Is, however, the formation of covalent filler elastomer bonds a prerequisite for reinforcement to occur ... 

The filler-elastomer chemical interactions take place through its surface functional groups and hydrogen atoms. Coupling agents improve polymer-filler adhesion. From the point of view of dynamic-mechanical properties for low strains, the filler-elastomer bonds have a positive effect in the reinforcement process. 

Fig. 12 Interface reactive two-component injection moulding - bond strength in dependence on the type of diisocyanate and TPU elastomer. Bond strength between PA-6/TPU. PA-6 Ultramid B3S TPU Elastollan 1185A, Elastolian B 85A, Eiastollan C 85A, Elastollan C 60D. Modifiers diisocyanates MDI, IPDI, IPDI-Uretdion, PBDI, Oligomer-TDI-DI. Addition of 1 up to 5 wt% ...

Chemlok, Elastomer bonding adhesives. Lord Corp., Chemical Products Div. 

For example, Kraus and Gruver (6) found such effects studying thermal expansion, free volume, and molecular mobility of HAF carbon black reinforced styrene-butadiene rubber (SBR) see Section 9.16.2. The SBR elastomer bonds to carbon black through a variety of secondary bonding modes. Thus, the train portion (see Figure 12.20) of the polymer chains in contact with the carbon black is relatively large and held to the surface rather firmly through multiple secondary bonds. 

In most situations, if substrate failure is achieved (Figure 10.9) then no more could be asked of the adhesive as the adhesive bond is stronger than the plastic or elastomer bonded. 

Sihcone elastomers bonded to a polyurethane liner are presented as the best to satisfy the functional and esthetic... 

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