Cyclosiloxanes with functional groups

The sequential addition method also allows the synthesis of many different block copolymers in which the two monomers have different functional groups, such as epoxide with lactone, lactide or cyclic anhydride, cyclic ether with 2-methyl-2-oxazoline, imine or episul-Hde, lactone with lactide or cyclic carbonate, cycloalkene with acetylene, and ferrocenophane with cyclosiloxane [Aida et al., 1985 Barakat et al., 2001 Dreyfuss and Dreyfuss, 1989 Farren et al., 1989 Inoue and Aida, 1989 Keul et al., 1988 Kobayashi et al., 1990a,b,c Massey et al., 1998 Yasuda et al., 1984]. 

For the calculation of Hory and Semiyen started out from the mass action Eqs. (5.20) and (5.21) like J + S, but then introduced a probability (IT(0)) for chain conformations bringing the chain ends in close neighborhood to each other with vectors of the functional groups allowing for immediate ring closure. Finally, they arrived at Eqs. (5.22) and (5.23) which were, in turn, used for the calculation of The calculated values were in good agreement with the experimental results for cyclosiloxanes with DP >15 (30 skeletal bonds). 

The copolymerization of a functional cyclotrisiloxane with D3 leads to a copolymer of dimethylsilojane units and sUoxane-containing functional group units which-in similar manner to the copolymer obtained by ROP of cyclosiloxane with mixed units-contains macromolecules of uniform structures with regards to the size, monomer unit composition and sequencing [117]. However, the distribution of units along the chain is different The more reactive comonomer enters the chain... 

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