Unravelling the crystal and molecular structure of a 1,3-linked aromatic poly(ether-ketone)
Unravelling the crystal and molecular structure of a 1,3-linked aromatic poly(ether-ketone)
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揭示1,3-连接芳香族聚醚酮的晶体和分子结构
DOI:
10.1016/j.mtchem.2022.100853
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发表时间:
2022
影响因子:
7.3
通讯作者:
Aldred P
中科院分区:
文献类型:
--
作者:
Aldred P
Highly-oriented fibres of the aromatic polyetherketone [-O(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)-]n(Ar = phenylene) obtained by nucleophilic polycondensation of F(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)F with HO(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)OH afford, after annealing, very well-resolved X-ray fibre patterns. The new diffraction data are used to test two different published models for the crystal and molecular structure of this polymer, both based on a three-ring crystallographic repeat, and it is shown by diffraction-modelling that neither of these structures is compatible with the new fibre-data. In contrast, we report a novel structure, based on a six-ring crystallographic repeat, that gives a simulated fibre-diffraction pattern in very good agreement with the experimental pattern. Crystal data for the new structure are: orthorhombic, space groupPcam,a= 7.67,b= 6.13, c = 29.72 Å, two chains per cell,V= 1397 Å3ρ= 1.43. Unusually, the two chains in the unit cell are related by ana-glide, meaning that the carbonyl groups in the two chains are alignedanti-parallel rather than having the more generally found parallel arrangement resulting from the presence of ab-glide. The new structure is shown to be fully compatible with previously published X-ray powder and electron diffraction data.
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DOI:
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发表时间:
1995
期刊:
影响因子:
--
作者:
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通讯作者:
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发表时间:
2007
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1994
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1991
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作者:
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通讯作者:
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DOI:
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发表时间:
1996
期刊:
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作者:
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通讯作者:
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