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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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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. m -2 ) 45°C ~ 25°C r:: ,;~~ 100 50 / fI • ~ // T " PTFE (a) r o Figure 6. 9999 4 5 45°C n-5 Linear relationship between n({ 1;1 and n-5 for perfluorinated alkanes. Determ1nation of surface energy of PTFE at 15, 20, 25 and 45 0 C.

6mJm- 2 and goP = 51 mJm -2. ,65mJm-2. o We may thus eonclude that for both systems, W ~W. The order of magnitude e 0 is correct and although W~W , this may weIl be attributable to imperfect e 0 moleeular eontact between the SBR hemispheres and the flat slides. Carre and Roberts have previously suggested the equivalence of W and J1~. c 0 The eonstancy of Wc suggest that the apparent work of adhesion evaluated in a touching-on experiment depends essentiallyon the surface proper ti es of the materials in contact.

9948 3 Fig. 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.

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


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