Polymer-solid interface

The randomization stage refers to the equilibration of the nonequilibrium conformations of the chains near the surfaces and in the case of crack healing and processing, the restoration of the molecular weight distribution and random orientation of chain segments near the interface. The conformational relaxation is of particular importance in the strength development at incompatible interfaces and affects molecular connectivity at polymer-solid interfaces. 

Fig. 17. A polymer-solid interface with X sticker groups on the polymer and F-receptor groups on the solid. As the chain adsorbs strongly on the solid, it tends to disentangle from the other chains in the polymer.

S. Granick. Dynamics of adsorption and desorption at polymer/solid interfaces. In Polymer Interfaces and Adhesion. Boston Butterworth-Heinemann, 1992, p. 227. 

Brochard, F., de Gennes, P. G., Shear-dependent slippage at a polymer/solid interface, Langmuir 8 (1992) 3033-3037. 

F. Brochard and P.G. deGennes, Shear-Dependent Slippage at a Polymer/Solid Interface, Langmuir, 8 3033-3037 (1992). 

D. H. David, Proceedings Polymer—,Solid Interfaces y First International Conference, Namur, Belgium, 1992, p. 133. 

Bolger, J. C., and Michaels, A. S., Molecular Structure and Electrostatic Interactions at Polymer Solid Interfaces." m Inh rfatc Conversion for Polymer Coatings, P. Weiss, ed., Elsevier, New York, 1969. 

For some recent work in this area see Theodorou, D. N., and Suter, U. W., Macromolecules 19, 139, 379 (1986) Mansfield, K. F., and Theodorou, D. N., Atomistic Simulation of Glassy Polymer Surfaces and Glassy Polymer Solid Interfaces, Annual AIChE Meeting, Washington, D. C., Nov. 1988. 

Solvent Effects on Adsorption at the Polymer/ Solid Interface... 

Adhering and Wearing Systems The Fibril/Craze Model. We may apply the concepts just described, to an adhering system, either for a thermoplastic polymer adhering to another solid, or for the case where two solids are glued together by a thermoplastic polymer. This requires that we postulate a fracture front progressing either at some distance from the polymer-solid interface, or else at the interface itself. The former corresponds to "cohesive failure" of the polymer, and need not concern us, as it has already been discussed by the senior author (24). 

Fourth, even in the absence of interfacial void areas or patches of lower-energy matter on the solid, small-scale stress concentrations under load can arise by reason of ridges, peaks, and other topographical features of the solid. These will lead to the triaxial stress that can cause cavitation, and hence initiate crazing. Ridges and peaks will, of course, be accompanied by valleys and the stress across the polymer-solid interface will be locally reduced below the average, in such depressions. Hence, enhanced attachment of bases of fibrils to the solid at valleys will be quite possible. 

I.V. Tsarenko and A.V. Makarevich. A structural model of polymer complex with protective property formed on corrosive liquid/steel interface. Polymer-Solid Interfaces From Model to Real Systems Proc. of the 2-nd Int. Conf, Namur, Belgium, 1996, pp. 467-482. 

A. Moreau, Y. De Puydt, and P. Bertrand, poster presented at Inti. Conf. on Polymer-Solid Interfaces, Namur (Belgium) Sept. 2-6, 1991. 

J.J. Pireaux. P. Bertrand, and J.L. Bredas. editors, Polymer-Solid Interfaces", lOP, Bristol, 1992. 

The surface excess layer for a polymer solution is closely related to the situation of polymer adsorption at a polymer/solid interface and, as described in more detail in section 5.2, both mean-field and scaling descriptions of the organisation of such layers have been put forward. A mean-field description gives... 

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