Experimental procedure block copolymers

The samarocene complexes SmMe(C5Me5)2(THF) and Smn(( 5Mc5)212 were employed as initiators for the synthesis of the well-defined block and triblock copolymers poly(trimethylsilyl methacrylate)-fc-PMMA, PTMSMA-fo-PMMA, PMMA-fo-PTMSMA, PTMSMA-fo-P BuA, PMMA-fo-P BuA, and PMMA-fo-P BuA-fo-PMMA [115]. When the procedure started with MMA polymerization, followed by the addition of TMSMA, block copolymers with low polydispersity and stoichiometric molecular weights in very good agreement with the experimental values were obtained. The reverse mode of add-... 

In particular, the effects of various stabilizers of the primary emulsion on the encapsulation of SCG were studied. Different hydrophilic polymers were employed namely gelatin (250 Bloom grades) or the polyoxyethylene-polyoxypropylene block copolymer, poloxamer 407. To further optimize the encapsulation yield, some experimental contrivances have been performed dispersion by turbine of the drug within the lipidic matrix, rapid emulsion cooling using an ice bath, and rapid separation of LS by filtration. The optimized procedure resulted in a final encapsulation of the drug of 50% (Table 2.10). 

The following section will describe the principal treatment of different types of molecular heterogeneity. Emphasis will be on the analysis of functional homopolymers (telechelics, macromonomers), copolymers (statistical, block, graft), and polymer blends. A detailed description of all experimental steps will be given for one or two representative examples of each group. Information on the application of the described procedures to different heteropolymer structures will be summarized briefly in the Sect. 5.1. 

Let us compare the prediction of the Stockmayer-Kennedy theory with the experimental results for SI diblock copolymers presented in a previous section. The glass transition temperature of the PS block in each SI diblock copolymer is given in Table 8.4. Using ps = 0.68 nm, bp — 0.59 nm, and M = Afp + Afpj in Eq. (8.18), we calculate G (ty) and G co) with the following procedure we calculate using Eq. (8.8),... 

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