By Stanley E. Wentworth (auth.), K. W. Allen (eds.)

ISBN-10: 9401090823

ISBN-13: 9789401090827

ISBN-10: 940109084X

ISBN-13: 9789401090841

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K-l at 1000C (details of the calculation are given in reference 10). 2. Polytetrafluoroethylene At 25 0 C, five values of ~ n are available for perfluoro alkyl compounds of formula Cn F2n+2 (IV) with n = These values are reported in Table A-4. t n are gi ven calculation 15 0 , for 20 0 of 'lf n using and 45 0 5,6,7,8 and 9. Some other values of c. As in 1. f n 5 'lJ 5 + (n-5)io:> wi th v> 5 and t~ = '({ PTFE The variation of Figure 6. m- 2 corresponding to the surface energy of PTFE at 150, 200, 250 and 400C.

9962 r I I I 50 o Figure 3. 1 2 3 4 5 n-2 Linear relationship between n'lf n' n"lf n D and n-2 for 1-nitroparaffins. m- 2 ) n Liquids r n-aliphatic primary alcohols >5 31. 9992 The deviation the shorter from the straight line chain lengths that the moleeules negligible can be of structure pOlarity. explained if 11 and we consider III display Intemolecular dispersive and polar in nature. interact also b for the liquids having forces a non- are both N-aliphatic primary alcohols hydrogen bonding. This is obviously not the case with n-alkanes for which the surface energy results only from dispersive interactions.

After 5 minutes, a eontaet area exeeed- ing the equilibrium value was assumed. The weight was removed and the diminishing eontaet radius followed as a funetion of time until (apparent) equilibrium was attained. Equation 3 was employed to ealeulate W. In the seeond type of experiment, referred to as "touehing-on adhesion", aseulating eontaet is established between hemisphere and flat. the radius a inereases towards (apparent) equilibrium. serves to estimate W. After eontaet, Again, equation 3 In both types of experiment, the kineties of evolu- tion towards (apparent) equilibrium has been followed, but in the present eontext, we are essentially interested in statie values of W.

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Adhesion 13 by Stanley E. Wentworth (auth.), K. W. Allen (eds.)

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