Abstract
The crystal structure of poly(pentamethylene sulfide) [—(CH2)5—S—]n, which is one of the polythioether series expressed by the general formula [—(CH2)m—S]n, has been studied by the use of X-ray diffraction and IR spectroscopic methods. The unit cell dimensions are a=9.61 Å, b=9.78 Å, c (fiber axis)=7.84 Å, and β=131°, and the space group is P21/a(C2h5). Four planar zigzag chains pass through the unit cell, and the fiber period consists of one monomeric unit.The molecular packing in the lattice is different from both the polytetrahydrofuran-type and the polyethylene-type in the polyether series [—(CH2)m—O—]n. A pair of molecular chains become closer together with the C—S—C dipole moments antiparallel, and such pairs of molecules as a whole pack in the lattice just in the same way as for orthorhombic polyethylene. In the infrared spectra the progression bands and the crystal-field splitting arising from the r(CH2) modes were observed. These infrared spectroscopic features were discussed on the basis of the simply coupled oscillator model.
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Gotoh, Y., Sakakihara, H. & Tadokoro, H. Structural Studies of Poly(pentamethylene sulfide). Polym J 4, 68–78 (1973). https://doi.org/10.1295/polymj.4.68
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DOI: https://doi.org/10.1295/polymj.4.68