Poly(a-metylene-?-butyrolactone) (PMBL) is a polymeric material, which has both high glass transition temperature (Tg) and high refractive index even though its chemical structure is similar to PMMA. In this presentation, we discuss an effect of stereoregularity on surface wettability by using PMBLs prepared by anionic polymerization, which can control the stereoregularity.Both isotactic-rich and atactic PMBLs were synthesized on the basis of conventional anionic polymerization method. Surface wettability was evaluated by using static and dynamic contact angle measurement. Interestingly, atactic PMBL showed higher surface energy than that of isotactic-rich PMBL, nevertheless, sliding angle of atactic PMBL was lower. These results imply that the surface reorganization of atactic PMBL is more suppressed than that of isotactic-rich PMBL. In order to investigate the details of surface wettability, time dependence of static contact angle measurement was demonstrated as shown in figure1. Open symbols are experimental result, and solid lines are the best-fit curve on the basis of eq 1.?(t)=(?ini-?ter)exp(-t/t)+kt+?ter (1)Here, ?ini and ?ter are the initial values of ? at t=0 and the terminal vale of ? in a qusai-equilibrium state, respectively, while t is the time corresponding to the ? decay in the initial stage. The t values obtained from PMBL were 2.87 s in isotactic-rich and 3.13 s in atactic, respectively. This result strongly supports that the surface reorganization of atactic PMBL is slightly suppressed than that of isotactic-rich PMBL.

Preparation of poly(a-methylen-?-butyrolactone) and evaluation of its surface physical properties

247th National Meeting (2014)

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