イオン性直鎖状ポリシロキサンの最新動向

抄録

Polysiloxanes, which are polymers composed of repeating siloxane bonds（-Si-O-Si-）as their main chains, exhibit distinct characteristics compared to carbon-based polymers. Polydimethylsiloxane（PDMS）and other polysiloxanes have seen widespread commercial use since their industrialization in the 1940s. Recently, there has been a growing interest in polysiloxanes made from silica sand due to their potential for carbon neutrality and sustainability. Efforts to functionalize polysiloxanes are ongoing worldwide, and a precise polymerization method has been developed. The introduction of ionic groups has revolutionized the concept of polysiloxanes and enabled the achievement of various functions. For example, molecular design that introduces ionic groups into all monomer units can convert flexible polysiloxanes into materials with elastic moduli comparable to those of petroleum-based resins. This is a new development for polysiloxanes, which has traditionally been used exclusively as materials for fluid products such as oils and shampoos. In addition, recent research has uncovered several unique properties of all-ionic polysiloxanes, such as self-assembly via ionic crosslinking, ordering of the self-assembled structure upon humidification, and exceptional adhesive properties. In this paper, we review the recent trends in ionic linear polysiloxanes.