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Irreversibility of stretching‐induced local conformational changes as verified through an FTIR dichroism study for PVC
Author(s) -
Guarrotxeekane,
Millán JoséLuis
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199911)48:11<1108::aid-pi276>3.0.co;2-0
Subject(s) - dichroic glass , dichroism , tacticity , absorbance , fourier transform infrared spectroscopy , elongation , vinyl chloride , materials science , conformational change , perpendicular , orientation (vector space) , circular dichroism , polymer chemistry , crystallography , chemistry , polymer , optics , composite material , stereochemistry , physics , nanotechnology , ultimate tensile strength , geometry , mathematics , chromatography , copolymer , polymerization
The dichroic behaviour of 615 and 637 cm −1 bands of the IR spectrum of poly(vinyl chloride) (PVC) has been analysed through FTIR measurements on PVC films stretched to various elongation ratios. By comparing the evolution both of the dichroic ratios and of the relative absorbance of those bands in the perpendicular direction to that of stretching, the occurrence of local chain orientation related to the conformational change GTTG − TT⇒ GTGTTT at mmr isotactic tetrads can be differentiated from the normal orientation of syndiotactic sequences, so confirming earlier proposals that the above conformational change takes place when stretching PVC. © 1999 Society of Chemical Industry