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The penultimate model of copolymerization taking into account the dependence of the reactivity of a macroradical on the type of the unit preceding the ultimate one is well-known in polymer chemistry. All types of chemical structure of multiblock copolymers capable to form during copolymerization processes described by such a model are revealed in the present work. Phase diagrams of copolymers of all these types specifying the regions of thermodynamic stability of spatially periodic mesophases differing in morphology are constructed in the framework of the weak segregation theory. Besides, the periods and amplitudes of the variation of different type densities of units in mesophases as well as volume fractions of these latter within the regions of their coexistence are calculated.

The earlier developed theory of nonrandom polycondensation (Kuchanov, et al. J Stat Phys 122, 875, 2006) is applied for the description of sol-gel polymerization of alkoxisilanes. The accuracy of simple approximate approaches used in literature to calculate critical conversion at the gel-point is evaluated. The results of calculation of the characteristics of gel's polymer network governing its elastic properties are presented for the first time. V V C 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 3093-3116, 2007