Polymerization, degree topotactic

Topotaxies found in the polymerization are classified into three groups according to the degree of topotactic control, relating the coincidence of the space groups to the directions of three axes of the monomer and polymer crystals44. ... 

Morphological changes, which are classified into four groups, have been correlated to the degree of topotactic control. Thermal analysis has been studied on DSP poly-DSP in some detail. Two main endothermic peaks of as-polymerized poly-DSP crystals are characterized as thermal depolymerization in the crystalline state and crystal melting point followed by thermal depolymerization in the molten state. From the results of the studies on the heat treatment of as-polymerized polymer crystals, a reversible topochemical processe has been established. 

From the observations of morphological changes, it can be concluded that the appearance of reacting phases is rather clearly correlated to the degree of topotactic control in the polymerization (see Sect. IV.b.). 

Solid-state polymerization of crystalline monomer without any intermediate loss of order. The topotactic oligomers have been produced, but the order is lost as the polymerization progresses beyond a low degree of polymerization. Test equipment used for determining the dynamic mechanical properties of plastics. 

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