Six kinds of poly(silyleneethynylenephenyleneethynylene)s
[−Si(R)H−C⋮C−C6H4−C⋮C−], wherein the phenylene group was the meta-, para- or ortho-form and R
represents a phenyl, methyl,
or hydrogen atom, were prepared, and the properties of the resulting
polymers were investigated. The
polymers, especially
poly[(phenylsilylene)ethynylene-1,3-phenyleneethynylene] (R
= Ph), which were
thermosetting, soluble in solvent, fusible, and moldable, showed high
heat-resistant and burning-resistant
properties. A cross-linking reaction mechanism concerning the
Si−H and C⋮C bonds was proposed, and
the correlation between the molecular structures and the thermal
properties was discussed. Fiber-reinforced polymers prepared using glass, carbon, or SiC fibers showed
sufficient mechanical strength
even at 400 °C under air. A black, hard, and glassy material
(C−SiC) was obtained when poly[(phenylsilylene)ethynylene-1,3-phenyleneethynylene] was heated
above 1000 °C under argon.
Eight types of polyurethane were synthesized using seven types of diisocyanate. It was found that the elasto-optical constant depends on the concentration of diisocyanate groups in a unit volume of a polymer and the magnitude of anisotropy of the dielectric constant of diisocyanate groups. It was also found that incident light scattered when bending stress was generated inside photoelastic polyurethanes. A high sensitive tactile sensor for robot hands was devised using one of the developed polyurethanes with high photoelasticity.
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