A polarised μ-FTIR study on a model system for nylon 6 6:: implications for the nylon Brill structure

被引:93
作者
Cooper, SJ
Coogan, M
Everall, N
Priestnall, I
机构
[1] Univ Durham, Dept Chem, Sci Labs, Durham DH1 3LE, England
[2] Univ Wales Coll Cardiff, Dept Chem, Cardiff CF10 3TB, S Glam, Wales
[3] ICI PLC, Wilton Mat Res Ctr, Middlesbrough TS90 8JE, Cleveland, England
基金
英国工程与自然科学研究理事会;
关键词
nylon; oligoamides; Brill transition;
D O I
10.1016/S0032-3861(01)00566-3
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polarised transmission FTIR microscopy studies (mu -FTIR) have been performed on a monodisperse 3-amide oligomer. The oligomer is a model compound for nylon 6 6; it has essentially the same room temperature crystal structure, and it undergoes the same high temperature transition, the Brill transition, prior to melting. However, the oligoamide forms extended chain, rather than chain-folded, crystals, and so crystals are produced that are essentially 100% crystalline, and of similar to mum-mm size. Consequently, this material is ideally suited for polarised mu -FTIR single crystal studies. The thermal polarised FTIR behaviour of this material provides definitive proof that the Brill transition does not involve major rearrangement of hydrogen bonds, since the strong parallel polarisation of both the NH stretch and amide I bands are retained right up to melting. Quantitative infrared dichroism measurements indicate that a maximum of 5 degrees rotation of the N-H bonds about the extended chain axis occurs prior to melting. These results strongly suggests that the equivalent Brill transition in nylon 6 6 also proceeds without significant hydrogen bond rearrangement. In addition we have investigated the behaviour of designated 'Brill', 'crystalline',,amorphous' and 'fold' bands that are present in our spectra. (C) 2001 Published by Elsevier Science Ltd.
引用
收藏
页码:10119 / 10132
页数:14
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