화학구조가 폴리스타이렌 아이오노머의 기계적 성질 및 모폴로지에 미치는 영향

Abstract

According to the multiplet/cluster model for amorphous random ionomer systems, ionic aggregates in the non-polar polymer matrix, called multiplets, reduce the mobility of the polymer chain segments surrounding them.1 With increasingion content, the number and size of reduced mobility regions increase and, eventually, the regions start overlapping. When the reduced mobility regions become large enough to show their own glass transition, i.e. a second Tgat higher temperature than the ion-poor matrix Tg. At this point, the restricted mobility regions are called clustered regions. It is well known that the second Tg is related with a number of factors, such as ion content, type of cation. In the present study, we prepared new ionomers, poly(styrene-co-sodium tiglate) PSTNa, and investigated their dynamic mechanical properties; the ionic modulus and loss tangent curves of the ionomers were measured. We also compared the mechanical properties of this ionomer system to those of poly(styrene-co-sodium methacrylate) PSMANa ionomers; these two ionomers have the same ionic group, i.e. sodium methacrylate, but PSTNa has methyl group in the beta position, compared to a hydrogen atom for the PSMANa ionomer