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Volumn 36, Issue 15, 1998, Pages 2849-2863

Structures for monodisperse oligoamides. A novel structure for unfolded three-amide nylon 6 and relationship with a three-amide nylon 6 6

Author keywords

Crystallization; Morphology; New crystal structure; Nylon oligoamides

Indexed keywords

CONFORMATIONS; CRYSTAL STRUCTURE; CRYSTALLIZATION; HYDROGEN BONDS; MOLECULAR STRUCTURE; NYLON POLYMERS;

EID: 0032206512     PISSN: 08876266     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1099-0488(19981115)36:15<2849::AID-POLB19>3.0.CO;2-R     Document Type: Article
Times cited : (19)

References (35)
  • 1
    • 1642644271 scopus 로고
    • H. Zahn and E. W. Pieper, Kolloid Z., 180, 97 (1962); alsom H. Zahn, International Symposium on Macromolecules, Wiesbaden, Germany, October 1959.
    • (1962) Kolloid Z. , vol.180 , pp. 97
    • Zahn, H.1    Pieper, E.W.2
  • 4
    • 11644253038 scopus 로고
    • Ph.D, Thesis, University of Bristol, UK
    • F. J. Balta Calleja and A. Keller, J .Polym. Sci. A, 2, 2151 (1964); also, F. J. Balta Calleja, Ph.D, Thesis, University of Bristol, UK (1962).
    • (1962)
    • Balta Calleja, F.J.1
  • 19
    • 85034289394 scopus 로고    scopus 로고
    • note
    • In these nylon 6 6 diffraction patterns, with cylindrical symmetry about c*, the 010 signal is overlaid by the 110 signal (0.370 nm and 0.369 nm, respectively) and therefore, some broadening of this off-equatorial signal [see Fig. 4(a)] may be caused by this 010/110 overlap. The difference in d-spacings of these signals is 0.001 nm (Table I), which translates to less than 6% of the measured thickness of the off-equatorial seen in the diffraction pattern [Fig. 4(a)]. Furthermore, the 110 signal (a projected intersheet distance at 0.236 nm) is also broad and not overlaid by any other signal in reciprocal space. Consequently, the relative broadness of the off-equatorial 010 intersheet diffraction signal is an inherent feature in the three-amide nylon 6 6 structure.
  • 20
    • 85034304533 scopus 로고    scopus 로고
    • note
    • 8a the c-value was the monomer repeat of 1.72 nm and subsidiary maxima were identified as a consequence of the limited lattice within each lamella (5.53 nm). In the case of the three-amide nylon 6 6 crystals, no subsidiary maxima are associated with the meridional signals, and all the diffraction signals emanate from the full chain c-repeat of 2.85 nm and not the monomer repeat.
  • 26
    • 85034278764 scopus 로고    scopus 로고
    • The occurrence of a better ordered crystal that grows under slow crystallization conditions necessarily suggests that this crystal phase has the lowest potential energy; otherwise, the less ordered phase would occur
    • The occurrence of a better ordered crystal that grows under slow crystallization conditions necessarily suggests that this crystal phase has the lowest potential energy; otherwise, the less ordered phase would occur.
  • 27
    • 85034289111 scopus 로고    scopus 로고
    • 3 size) that would be suitable for full atomic structure determinations by traditional single crystal X-ray diffraction studies
    • 3 size) that would be suitable for full atomic structure determinations by traditional single crystal X-ray diffraction studies.
  • 28
    • 85034308150 scopus 로고    scopus 로고
    • note
    • Interdigitation can occur by successive layers being offset in the a- and/or b-directions. An offset in either of these directions will be a sufficient condition to divert diffraction intensity from the 110 signal to the 111 (or 111, depending on the off-set direction). An offset in the a-direction will also divert some intensity from the intense 200 equatorial diffraction signal to the 201; however, the 200 signal will not be weakened to a significant extent unless the offset is large. Interdigitation can be represented in the c = 2.9 nm unit cell by tilting the oligomer chain relative to the c-axis.
  • 29
    • 85034292446 scopus 로고    scopus 로고
    • note
    • This is equivalent to the primitive triclinic unit cell: a = 0.515 nm, b = 0.520 nm, c = 2.90 nm, α = 50°, β = 71°, and γ = 59.6°.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.