Effects of the Sequence Distribution of Poly(acrylonitrile−butadiene) Copolymers on the Surface Chemical Composition As Determined by XPS and Dynamic Contact Angle Measurements

Polyacrylonitrile (PAN)/crown ether composite nanofibers for the selective adsorption of cations

“…The peak areas of the functional groups of -CH 2 , -CH-CN and -C^N are equal to each other. 53,54 The survey spectrum of PAN-10 shown in Fig. 7 also shows the peaks of the C 1s, N 1s, and O 1s core levels.…”

Estimation of the Surface Properties of Styrene-Acrylonitrile Random Copolymers from Contact Angle Measurements

“…Using attenuated total reflectance (ATR) and transmission IR these authors suggest that polystyrene is segregated at the surface in a localized region less than 30 Å from the air/polymer interface. Recently L. Li et al (9), using XPS and DCA in the study of poly(acrylonitrile-butadiene) copolymers, suggested that for surface segregation to occur a minimum segment length is required. The random copolymers of styrene and acrylonitrile (SAN) are some of the most widely used materials in the thermoplastic industry, for example as an ingredient in acrylonitrile-butadiene-styrene (ABS) resin.…”

Onset of surface segregation controlled by the segment length of the low-energy component of polymers

“…In 6FBA polymers, the surface energies of CH 2 groups and the rigid 6FBA component are similar; and no surface excess of the flexible segment was observed even when the number of CH 2 groups reached 18. From our previous 12,13 and current results, we can conclude that the length of the low-surface-energy segment and the surface energy difference between the low-and high-surface-energy segments are two important parameters that determine the surface composition of these polymers.…”

“…5, which displays n s determined using Eqn (3) as a function of n. The data clearly show that for small n and at large sampling depths n s D n. These results agree with those of our previous work. 12,13 The CH 2 segment has a lower surface energy than the rigid BA segment, but no surface segregation of the CH 2 segment occurred Figure 5. The number of CF 2 groups on the surface, n s , determined by the F-to-O atomic ratio versus the number of CF 2 group in the bulk, n, at different take-off angles.…”