Bibcode
Iglesias-Groth, S.; Strazzulla, Giovanni; Cataldo, Franco
Referencia bibliográfica
Radiation Physics and Chemistry, Volume 78, Issue 4, p. 244-250.
Fecha de publicación:
4
2009
Número de citas
2
Número de citas referidas
2
Descripción
Phenylacetylene was polymerized as inclusion compound (clathrate) inside
deoxycholic acid (DOCA) crystals. The polymerization was initiated by
γ radiation and a total dose of 320 kGy was employed. The
resulting polyphenylacetylene (PPA) was isolated by dissolution of
deoxycholic acid in boiling ethanol. PPA high polymer was accompanied by
a series of phenylacetylene oligomers, which were detected by liquid
chromatographic analysis (HPLC). PPA was characterized by electronic
absorption spectroscopy and by FT-IR spectroscopy in comparison to a
reference PPA prepared by a stereospecific catalyst. The microstructure
of PPA from inclusion polymerization was highly trans type, similar to
that observed on PPA prepared by bulk radiolysis. No optical activity
was detected by polarimetry on PPA prepared by inclusion polymerization.
The host-guest complex PPA/DOCA was studied by differential thermal
analysis (DTA) and by thermogravimetry (TGA). DTA provided evidences of
the host-guest complex formation from the shift of the melting point of
DOCA while the TGA confirmed the identity - in terms of thermal
behaviour - of the PPA from inclusion polymerization with that from
stereospecific polymerization.
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