Solution casting Subject

The first five of these techniques involve deformation and this has to be followed by some setting operation which stabilises the new shape. In the case of polymer melt deformation this can be affected by cooling of thermoplastics and cross-linking of thermosetting plastics and similtir comments can apply to deformation in the rubbery state. Solution-cast film and fibre requires solvent evaporation (with also perhaps some chemical coagulation process). Latex suspensions can simply be dried as with emulsion paints or subjected to some... 

In the second approach, metal-ion/complex was first attached to one of the polymer blocks. A thin film of the resulting polymer metal complex was then obtained by spin coating/solution casting. Alternatively, the polymer metal complex may also be dissolved in a suitable solvent system that selectively dissolves one of the blocks. Micelles or nanosized aggregates formed in this case. The micellization of amphiphilic block copolymers and their use in the formation of metal nanoparticles has been discussed previously.44 A monolayer of micelles was introduced on a substrate surface by dipping or electrostatic attraction. The substrate was then subjected to further chemical or physical treatments as mentioned earlier. The third approach involves the formation of micelles from the metal-free block copolymer in a suitable solvent system. The micelle solution was then added with metal ion, which was selectively coordinated to one of the blocks. These micelle-metal complexes can also be processed by a procedures similar to the second approach. 

Today, a great deal of literature is available on solution casting of polymers for applications like packaging, separation membranes, sensors, and fuel cells. A review on the subject is available (Guillen et al. 2011). 

Nanocomposites of PHBV (21 mol% of HV) and acidified MWCNT-COOH were prepared by solution blending followed by solvent casting at 70° C by Ma et al. (2012). Chloroform was used as solvent and the solution was subjected to ultrasonication. Nanocomposites were produced with 0, 0.5, 1, and 1.5 wt% of MWCNT-COOH and the acidification of MWCNT was made using a mixture of concentrated sulfuric and nitric acids. Adding MWCNT-COOH to PHBV implied in a growth of crystallinity in the nanocomposites, increase in crystallization... 

Fig. 18 shows electron micrograph of a blend system of 75/25 polystyrene/SBS tri-block copolymer, cast from toluene solution and subjected to a relatively high level of impact tensile stress. The block copolymer is 40/60 S/B in its fractional jomposition, and has an intrinsic viscosity of 3.01(gm/dl). In contrast to the commercial HIPS in... 

The polymer was dissolved in chloroform and doped with 5 mol% of BMAB. The solution was cast on a glass plate and dried to give a film. The sample was subject to monochromatic irradiation at 366 nm... 

The casting procedure consisted of drawing an aqueous solution of PVA to a thin layer, and after an evaporation period, immersing in the complexing bath. The complexing bath used in our study was basically a saturated CuSO solution, with or without a series of possible additives. After a period of equilibration of over 24 hours, the membranes were dried and subjected to dry heat treatment,in order to stabilize the asymmetric structure obtained. The preparation conditions of several membranes prepared by this method are shown in Table V. 

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