Polyethylene surface tension data

In addition to the two fluorocarbon surfaces, it is informative to consider data for two hydrocarbon solid surfaces paraffin and polyethylene. Adhesion tension data for these surfaces have been presented by Fox and Zisman [35]. Selections of these data are given also in Table I, as are some additional data of Bascom and Singleterry for polyethylene [10]. 

Microscopic foam films have been used to study the steric interaction between two liquid/gas interfaces [130]. Two ABA triblock copolymers of the Synperonic PE series were employed P85 and F108. These commercial non-ionic surfactant were used as obtained from ICI Surfactants, Witton, UK. Blocks A are hydrophilic polyethylene oxide (PEO) chains, while block B is a hydrophobic polypropylene oxide (PPO) chain. The molecular masses and average EO contents are known from the manufacturer and yield approximate chemical formulae (Table 3.3). Data about the surface tension of electrolyte-free aqueous copolymer solutions can be seen in Fig. 3.31 [130]. It was additionally checked that NaCl (up to 510 2 mol dm 3) had no influence on these values. 

Fig. 23. The relative surface tension difference -Ay/y(T) between components of six poly-olefinic blends grouped in three microstructurally identical pairs Xj/x2 (x1>x2) 66/52 (Q, ), 86/75 (A, ) and 75/66 (V, Y). Open and solid symbols correspond to blends with deu-terated more (x,) and less (x2) branched components, respectively. Large and small symbols correspond to previously determined whole segregation isotherms and singular surface excess data, respectively [16,120,145]. y(T) is given by Eq. (45) for polyethylene. Solid lines denote average values for each blend at Tref=100 °C (thick bar)...

We have reported [66] a limited study of spread polymethyl methacrylates and polyethylene oxide. Figure 12.19 shows the variation in surface tension, shear viscosity and dilational modulus obtained from SQELS data as a function of surface concentration. The viscoelastic moduli both show maximum values at finite values of the surface concentration. As the capillary waves generate oscillatory stress and strain, these are related via the complex dynamic modulus of the surface... 

The present discussion is restricted to two of the surfaces studied by Bascom and Singleterry-i.e., polytetrafluoroethylene and polyethylene. Data for two hydrocarbon liquids-n-decane and isopropylbiphenyl-which had nonzero contact angles on each of these surfaces are given in Table in. Also given are the appropriate one-liquid adhesion tensions from Table I. 

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