Back to Search
Start Over
Hierarchical structure of the triclinic α-phase crystal in nylon 6,12 mediated by two-dimensional confinement
- Source :
- Journal of Applied Crystallography. 53:27-33
- Publication Year :
- 2020
- Publisher :
- International Union of Crystallography (IUCr), 2020.
-
Abstract
- It has been recognized that macromolecular chains can self-assemble into a hierarchical structure from lamellae to spherulites in bulk crystallization. However, little account has been taken of crystal symmetry effects on the hierarchical nanostructure in polymers under cylindrical confinement. In this research, a model polymer, nylon 6,12, most commonly occurring in the triclinic α phase, was chosen in order to demonstrate the effect of triclinic symmetry on the 2D-constrained polymer nanostructure. The self-arranging unit of nylon 6,12 takes various forms, including stems, unit cells, hydrogen-bonded sheets, lamellae and complex spherulites, which is an essential structural feature for investigating hierarchical nanostructure. The rod nanostructure in confinement was examined by cross-checking electron and X-ray diffraction techniques. It is found that the a* axis of the α-phase cell is inclined at about ±6–11° to the rod long axis within the a*b* plane around the c axis (c axis ⊥ rod long axis). The rotation of the a*b* plane most likely results from the impact of the triclinic symmetry on the molecular chain packing under 2D confinement. A mechanism for this a*b* plane tilting is proposed.
- Subjects :
- Materials science
Nanostructure
02 engineering and technology
Crystal structure
Triclinic crystal system
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
General Biochemistry, Genetics and Molecular Biology
Symmetry (physics)
0104 chemical sciences
law.invention
Crystal structure prediction
Crystal
chemistry.chemical_compound
Crystallography
Nylon 6
chemistry
law
Crystallization
0210 nano-technology
Subjects
Details
- ISSN :
- 16005767
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Crystallography
- Accession number :
- edsair.doi...........ffcc215ee25b29063ddb9496830571e1
- Full Text :
- https://doi.org/10.1107/s1600576719014705