Anri Ozaki, Koha Sumita, K. Goto
Apr 2, 2013
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Journal
Macromolecules
Abstract
We prepared the geometric isomers of decahydro-2-naphthols as the source materials for the synthesis of poly(decahydro-2-naphthyl methacrylate)s [poly(DNMA)-I, -II, -III, and -IV] including alicyclic ester groups with different geometric structures. The geometry and conformational dynamics of the decahydro-2-naphthyl moieties were investigated by NMR spectroscopy and DFT calculations. We synthesized each isomer of the methacrylic monomers, polymerized them, and investigated the optical, thermal, and mechanical properties of poly(DNMA)s with different isomer compositions. The Tg values of the poly(DNMA)s were in the following order: 139.3 °C for poly(DNMA)-II < 142.7 °C for poly(DNMA)-I < 146.2 °C for poly(DNMA)-III < 152.9 °C for poly(DNMA)-III/IV. On the basis of the dynamic motion of the alicyclic substituents determined by dynamic mechanical analysis, the tan δ peaks due to the β-relaxation for the a conformation change of the side group were observed for poly(DNMA)-I, while no peak was observed for po...