Adhesion and Adsorption of Polymers by Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)

By Lieng-Huang Lee (auth.), Lieng-Huang Lee (eds.)

Honolulu is a most lovely position, appropriate for all occa­ sions. Its selection because the assembly website for the 1st Joint Chemical Congress among the yank Chemical Society and the Chemical Society of Japan was once praised through scientists from each side. in this Congress, the foreign convention on Adhesion and Adsorption of Polymers used to be held on the Hyatt Regency lodge among April 2 and five, 1979. We had audio system from ten international locations featuring over 40 papers concerning the subject material. It was once a memorable occasion. not like our earlier adhesion symposia held in 1971 and 1975, this used to be the 1st time within the comparable convention that we mentioned either adhesion and adsorption of polymers concurrently. those vital phenomena usually are not purely inter-related, but additionally both very important in adhesive expertise in addition to biochemical approaches. The papers awarded to this convention take care of those phenomena from either primary and useful viewpoints. moreover, with the development of recent floor analytical strategies, the particular, microscopic happenings on the interfaces may be pin­ pointed. therefore, characterization of interface grew to become one of many significant focuses of this convention. for that reason, a extensive assurance of the subject material comprises statistical thermodynamics, floor physics, floor research, fracture mechanics, viscoelasticity, failure research, floor amendment, adsorption kinetics, bio­ polymer adsorption, and so on. because of the diligence of our contri­ butors, we're now capable of post the ultimate papers in those volumes.

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Similar experiments by ourselves in order to examine the applicability of the additivity law to random copolymers with additional experimental values, and further to confirm the sequence effect by the comparison with block copolymers. The results almost agree with those of Rastogi et al. under the same conditions. An example in our observations is shown in Fig. 14. The random copolymers (a in the figure) behave just like E-P and THF -PO series, while in contrast the block copolymers lower y drastically at a few mole fractions of PO, and the more the sequence length m, the more the decrease.

L. Hoy, ~ Paint Technol. 42, 118 (1970). M. Hansen and A. Beerbower, "Solubility Parameters in "Encyclopedia of Chemical Technology", Supplement Volume, 2nd Edition, Wiley, New York (1971). C. L. McClellan, "The Hydrogen Bond", Freeman, San Francisco (1960). R. Dann, J. Colloid Interface Sci. 32, 302 and 321 (1970). M. Fowkes--and S. Maruchi, CoatingS-and Plastics Preprints 37, 605 (1977). M. C. McCarthy, to be published. M. A. Mostafa, Ind. Eng. Chem. Prod. R&D 11, 3 (1978). J. R. Thomas, ~ Phys.

Samples of longer side chain have not been examined. Here the results for poly (vinyl alkylate)s made up of naliphatic acids (14) are shown in Fig. 10. Y reaches the minimum value at poly (vinyl caprylate) of c8 side chain. Similar results are obtained for dialkyl phthalates of various alkyl chain lengths (15) as shown in Fig. 11. These materials are or tho compounds, so that their branching structure rather likes poly(vinyl alkylate)s. Components of surface tension, y d and y p in terms of Fowkes (16), are estimated by the measurements of interfacial tension (y 12) against polyethylene at 150 0 C in the case of poly(vinyl alkylate)s, and by the measurements of contact angle (6) on solid paraffin in the case of dialkyl phthalat8s at 20 0 C, according to the equation Y 12 = Y1 + Y2 - 2~ ( 11 ) where y 1(= y~ + y~) is taken as the surface tension of the sample, and Y2(= y~) is that of polyethylene or paraffin.

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