Poly surface segregation from

Mayes group demonstrated the direct preparation of amphiphilic graft copolymers by ATRP of poly(oxyethylene methacrylate) (POEM) monomers initiated from the secondary fluoride sites of PVDF backbone. Surface segregation of PVDF-g-POEM additives in PVDF was examined as a route to wettable and foul-resistant surfaces of PVDF microporous membranes [100-102], ATRP of St, PEGMA, NaSS, 2-(A,A-dimethylamino)ethyl methacrylate (DMAEMA), butyl methacrylate (BMA), and 2VP, initiated directly from the vinylidene fluoride (VDE) units of PVDF main chains, has also been reported [103-109]. 

From what was said above, it follows that the IPN components have various affinity to solid surfaces, and, therefore, in the course of their synthesis, the processes of selective adsorption at the interface must be observed. In reality, for various IPNs (polyurethane-polyesteracrylate, polyurethane-polybutyl methacrylate), it was found that near the interface, the composition of the surface la er differs from the composition in the bulk. IR-ATIR method was used. Supports were glass and poly(ethylene terephthalate). It was discovered that at the interfaces IPN-solid and IPN-air, the surface layers had very different compositions. For PU-PEA IPN, the layer formed at the interface with glass is enriched with PEA, whereas at the interface with air, excess concentration of PU was found. This effect of surface segregation is increasingly more pronounced with diminishing distance from the interface. For the interface with poly(ethylene terephthalate) in IPN based on PU and PBMA, the surface layer is enriched in PBMA. The effects depend on the IPN composition. It was established that the composition of the layers strongly depends on the kinetic conditions of curing. ... 

A poly(styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT-PSS) film, which had been spun-cast from a water suspension, was used in a certain polymer-emitting diode device configuration. The results of the measurements performed on this sample, combined with those of the studies outlined above, have indicated that several important parameters can affect device performance. PSS surface segregation has been identified, with phase segregation occurring on a single grain of PEDOT-PSS [56]. 

An alternative approach to creating surfaces of rings is stimuli-induced segregation from a cast film (Figure 26.13). Blends of polystyrene and cyclic poly(oxyethylene) (1.5 kg/mol, 10wt%) were prepared and spun cast from toluene onto glass slides (Singla, 2004). A drop... 

Figure 26.13 Surface segregation of cyclic poly(oxyethylene) (1.5kg/mol) from its blend with polystyrene by annealing in a high-humidity environment. Images of water drops are shown with then-contact angles above the as-spun-cast film (left) and after annealing (right).

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