Radical ring-opening polymerization (radical ROP) is a category of polymerization, which has attracted considerable interest from the following viewpoints: 1) Its potential to afford polymers with main chains containing various hetero atoms that are inherited from the corresponding heterocyclic monomers. 2) Its potential applicability to copolymerization with conventional vinyl monomers such as styrenic and acrylic monomers. These polymerizations undergo no shrinkage, because the highly compact structures of monomers are transformed into acyclic structure that occupies much larger space. Therefore, these �volume expandable monomers� can be expected to be used as sealants and adhesives, which are free from formation of voids and cracks caused by the volume shrinkage during the polymerizations of conventional monomers. We will present a synthesis and polymerization of new monomer containing bulky adamantane structure. Their radical ROP showed the volume expansion value of +6.1%. We also present the radical ROP of other monomers such as cyclic vinyl sulfone, approaching to industrial application.

Scope and recent development of radical ring opening polymerization

248th National Meeting (2014)

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