To date extensive studies on solid-state polymerization of many monomers have been reported mainly covering kinetics and reaction mechanism. However, the lack of crystal data for monomers is a hindrance for clarifying the role of structures of original monomer crystals on their solid-state polymerization. In this review a few examples on structural investigation of solid-state polymerization are given. The examples include photopolymerization, y-irradiated addition polymerization, ring opening polymerization and polymerization in urea- and thiourea-adducts, and illustrate the variety of solidstate polymerizations. The characteristics of resulting polymers are also mentioned briefly in terms of stereospecificity of molecular, chain, preferred orientation of polymer crystal, fine texture etc.
