Solid solution of poly cetylvinylether , isomorphous

The topochemical aspect of the reaction varies depending on the type of mesomorphic state. Topochemical polymerization can be expected in smectic mesophases (l2) where the functional groups of the layer formed by the parallel chains are located in one plane (1 4- 1 ) Homogeneous topochemical Reactions may proceed in a layer with either uni- or bimolecular structure. 

In the polymerization of cetylvinylether (l ) the polymer formed remained isomorphous with the monomer and the melting point of the system increased. This isomorphism was destroyed, however, when the system reached its melting point. After cooling it formed a two-phase system. 

In the polymerization of cholesterylacrylate the isomorphism of the polymer with the monomer could be preserved up to the conversion limit of JOfo at 0 C but at 30 C the 

The decrease in the melting and/or clearing points of the monomers caused by the presence of the polymer was detected in both the smectic state polymerization of vinyl oleate (l8,19) and in the polymerization of cholesterylacrylate in the cholesteric state (ij). The polyvinyl oleate formed in this reaction was crystalline while the polycholesterylacrylate was amorphous. The temperat ore of the phase transition was reduced in both cases. 

The polymerization in the cholesteric state of this monomer is a heterogeneous phase reaction. The polymer formed is precipitated as a smectic phase, and as the conversion increases, the cholesteric monomer is dissolved in the isotropic system, and a homogeneous phase is formed. As the reaction proceeds further, the system becomes smectic ( 25)  

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