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Conformational and packing energy of the crystalline α modification of syndiotactic polystyrene

✍ Scribed by Paolo Corradini; Claudio De Rosa; Gaetano Guerra; Roberto Napolitano; Vittorio Petraccone; Beniamino Pirozzi

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
296 KB
Volume
30
Category
Article
ISSN
0014-3057

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✦ Synopsis

Conformational and packing energy calculations have been performed on the ~t modification of syndiotactic polystyrene. The conformational energy has been optimized as a function of the internal parameters of the chain. The packing energy has been calculated considering at first the best packing of chains in triplets and then the best packing of triplets in the space groups R3 and P3. The comparison of the results of the energy calculations with the X-ray experimental data corroborates a rhombohedral mode of packing of the triplets, corresponding to the space group R3.

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Fourier transform infrared (FTIR) spectra of syndiotactic polystyrene (s-PS) semicrystalline samples have been examined by using the spectral subtraction approach. For the crystalline forms including trans-planar chains (trigonal a and orthorhombic b) a number of conformational and structural order