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Unique morphology of amorphous polystyrene synthesised by nickel bis(acetyl acetonate)/methylaluminoxane
Author(s) -
Zhao ChunTian,
Ribeiro Maria do Rosário,
Portela Manuel Farinha
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(200209)203:13<1983::aid-macp1983>3.0.co;2-k
Subject(s) - polystyrene , tacticity , styrene , amorphous solid , polymer chemistry , norbornene , methylaluminoxane , materials science , crystallography , copolymer , polymerization , polymer , chemistry , metallocene , composite material
Polystyrene synthesised at room temperature by nickel bis(acetyl acetonate)/methylaluminoxane is globally atactic and amorphous in solid state. Unexpectedly, the amorphous polystyrene displays, in addition to normal amorphous scattering, a Bragg X‐ray diffraction at 2 θ = 14°. This sharp reflection has been related to the presence of individual isotactic polystyrene sequences, as shown by 13 C NMR. The isotactic sequences are long enough so that they are likely to form 3 1 helices, but not necessarily significantly laterally ordered and crystalline in solid state.WAXD diagrams of (1) polystyrene synthesised by Ni(acac) 2 /MAO; (2) poly(styrene‐ co ‐norbornene), styrene content 28.4 mol‐%; (3) poly(styrene‐ co ‐norbornene), styrene content 9.5 mol‐%; (4) polynorbornene.