X-ray study of microstructure of slightly plasticized poly-(vinylchloride) (PVC) |
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Authors: | A Ferrero E Ferracini |
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Institution: | (1) Present address: Centro di Studio per la Fisica delle Macromolecole del C.N.R. and Dipartimento di Chimica G. Ciamician, Università di Bologna, Bologna, Italy |
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Abstract: | Small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) as well as transmission electron microscopy (TEM) techniques have been applied to investigate the microstructure of a number of commercial poly-(vinylchloride) (PVC) samples, stretched 200% and annealed for 1 h at 110 °C. From SAXS analysis, the microstructure is described as an ensemble of quasi-spherical particles one-dimensionally ordered (in the fiber axis direction) and with large distance fluctuations in the equatorial plane. The superstructure is described as fibrillar or nematic-like. TEM micrographs confirm the SAXS data.SAXS meridional patterns present 001 and 003 reflections of Ca-stearate added as stabilizer to the samples, while WAXS profiles do not show any crystalline reflection of Castearate.An interaction of Ca-stearate molecules with PVC chains is postulated, which could partially account for the phenomenon called antiplasticization of PVC. |
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Keywords: | Poly-(vinylchloride) antiplasticization superlattice paracrystals |
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