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Stereostructures of hydrogenated poly(1,4‐(1‐arylbutadienes)) prepared by anionic initiators studied by means of NMR
Author(s) -
Cho Iwhan,
Lee Seongil
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990301)20:3<152::aid-marc152>3.0.co;2-a
Subject(s) - triad (sociology) , tacticity , tetrahydrofuran , copolymer , polymer chemistry , ethylene , materials science , carbon 13 nmr , polymerization , proton nmr , anionic addition polymerization , nmr spectra database , spectral line , chemistry , polymer , catalysis , organic chemistry , physics , psychology , astronomy , solvent , psychoanalysis , composite material
Poly(1,4‐(1‐phenylbutadiene)) (poly1BP) and poly(1,4‐(1‐biphenylylbutadiene)) (poly1BPB) polymerized anionically in tetrahydrofuran (THF) have microstructures of 90.9 and 96.4% of 1,4 units, and 9.1 and 3.6% of 3,4 units, respectively, as determined by 400 MHz 1 H NMR. However, poly(1,4‐(1‐naphthylbutadiene)) (poly1NB) and poly(1,4‐(1‐phenanthrylbutadiene)) (poly1PAB) have 1,4 structures only. The 13 C NMR spectra of the alternating copolymers of arylethylenes and ethylene obtained by hydrogenation of the poly(1,4‐(1‐arylbutadienes)) show a fine structure that can be attributed to dyad or triad stereosequences. These spectra indicate that the alternating (arylethylene/ethylene) copolymers prepared from poly1BPB, poly1NB, and poly1PAB slightly favor isotactic structures.