Synthesis and Characterization of Polyamide by Interfacial Polycondensation of Dichloroformyl-Containing γ-Lactone with Hexamethylenediamine

Kimura, Takao; Morimoto, Hideo; Sasaki, Eiji; Tanji, Kazunobu; Hamashima, Motome

doi:10.1295/polymj.22.1015

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…This is in good agreement with the previous research on nylons containing the odd number CH 2 units 9–17. In the previous researches, it was found that some nylons exhibit the orthorhombic crystal systems 36–39. However, the ED and WAXD results do not match well with this orthorhombic crystal structure.…”

Section: Resultssupporting

confidence: 91%

Polymorphism and crystalline transitions of the novel even–odd nylons derived from undecanedioic acid

Cui

Yan

2005

J Polym Sci B Polym Phys

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The crystal structures of nylons X 11 under different conditions (X = 2, 4, 6, 8, 10, and 12) were investigated by wide‐angle X‐ray diffraction (WAXD) and electron diffraction (ED). Both the solution‐ and melt‐crystallized samples of nylon 2 11 possess the hexagonal lattice (named γ‐form). Nylons 4 11 and 6 11 exhibit the monoclinic unit cell (termed as α‐like form) for both samples characteristic of two strong diffractions at 0.44 and 0.38 nm. For nylons 8 11, 10 11, and 12 11, the α‐like form are obtained for the solution‐crystallized samples while the β‐like ones are obtained in the case of the melt‐crystallized ones, with typical strong diffractions at 0.42 and 0.40 nm. The quenched nylon 12 11 samples annealing at different temperatures were also studied in this work to illustrate the various crystal forms obtained under different conditions. During the heating process, the α‐like forms of the solution‐crystallized samples for nylons 8 11, 10 11, and 12 11 transform into the high‐temperature hexagonal phases prior to melting, while those of nylons 4 11 and 6 11 did not show such transformations before melting. Variable‐temperature Fourier transform infrared spectroscopy was applied to investigate the crystalline transition phenomena and illustrate their essential features in the molecular level. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2048–2060, 2005

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Section: Resultssupporting

confidence: 91%