Morphology and structure of nylon‐2,14 single crystals from dilute solution

Abstract

A perfect single crystal of nylon‐2,14 was prepared from 0.02% (w/v) 1,4‐butanediol solution by a “self‐seeding” technique and isothermal crystallization at 120 and 145 °C. The morphology and structure features were examined by transmission electron microscopy with both image and diffraction modes, atomic force microscopy, and wide‐angle X‐ray diffraction (WAXD). The nylon‐2,14 single crystal grown from 1,4‐butanediol at 145 °C inhabited a lathlike shape with a lamellar thickness of about 9 nm. Electron diffraction and WAXD data indicated that nylon‐2,14 crystallized in a triclinic system with lattice dimensions a = 0.49 nm, b = 0.51 nm, c = 2.23 nm, α = 60.4°, β = 77°, and γ = 59°. The crystal structure is different from that of nylon‐6,6 but similar to that of other members of nylon‐2Y. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 1913–1918, 2002

Optimization of mechanical properties of glass‐spheres‐filled polypropylene composites for extrusion‐based additive manufacturing

“…2b) that enlarge the compound's resistance to flow [42,99]. It was shown by various studies [31,42,51,89], that an addition of elastomeric components to glass-filled PP can lead to an overall viscosity increase due to the development of core-shell microstructures. A similar trend can be observed for the blended composites in Fig.…”

“…The addition of an immiscible polymer (am.PO) is known to strongly impact the morphology and the fractographic appearance and therefore also the mechanical properties [30,31,33,42,51,89,90]. Ternary blends can either form a three-phase morphology consisting of separate filler and polymer particles embedded in a matrix, or form a two-phase morphology, in which the second polymer encapsulates the filler [42].…”

Original Crystal Structures of Even–Even Polyamides Made of Pleated and Rippled Sheets

“…12 The short CH 2 −CH 2 sequence of the diamine part imposes this specific structure to the whole family, for lengths of the diacid part ranging from 4 to 34 carbon atoms. [12][13][14]30 At first sight, the similarity of chemical structures (the PA2,2n polymers of the first column are members of the even−even nylons family) and the perfect match of the two equatorial reflections at 3.9 and 4.2 Å with the computed models for PA66 suggest that the crystal phases of these 2,2n nylons are based on the "simple" pleated sheet structure illustrated in Figure 4. This is not so.…”

“…Figure ). The short CH 2 –CH 2 sequence of the diamine part imposes this specific structure to the whole family, for lengths of the diacid part ranging from 4 to 34 carbon atoms. − , …”

Synthesis and characterization of polyamides containing octadecanedioic acid: Nylon‐2,18, nylon‐3,18, nylon‐4,18, nylon‐6,18, nylon‐8,18, nylon‐9,18, and nylon‐12,18

“…There have been several reports on the crystallization behavior and morphological studies of nylons containing a high aliphatic content, that is, nylon‐2,143 (no thermal data reported), nylon‐4,14,4 nylon‐10,12,5 nylon‐10,14,6 and nylon‐12,10 7. From systematic studies of nylons made from a range of diamines with high‐methylene‐content diacids, there are reports of nylon‐ X ,16,8 nylon‐ X ,20,9 and nylon‐ X ,22 10.…”