Free volume characteristics in poly(
n-alkylphenylsilane)s whose
n-alkyl side-group was changed from methyl to
n-dodecyl were investigated by positron annihilation technique at room temperature. The average radii of free volume increase in two steps, one is observed with an increase in the length of
n-alkyl side-groups from methyl to
n-pentyl, the other from
n-hexyl to
n-dodecyl with an interruption between
n-hexyl and
n-pentyl. The radius in poly(
n-hexylphenylsilane) is smaller than that in poly(
n-pentylphenylsilane). This agrees with the result of the theoretical calculation that
n-hexyl side chain is entangled leading to suitable packing in the literature.
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