Effects of winding speed, drawing and heating on the crystalline structure of nylon 6 yarns

1981 ◽  
Vol 26 (2) ◽  
pp. 713-732 ◽  
Author(s):  
H. M. Heuvel ◽  
R. Huisman
Keyword(s):  
Crystalline Structure ◽  
Nylon 6

Molecular Orientation and Crystalline Structure of Aligned Electrospun Nylon 6 Nanofibers: Effect of Gap Size

2011 ◽  
Vol 175-176 ◽  
pp. 333-336
Author(s):  
Naotaka Kimura ◽  
Jong Chul Park ◽  
Byoung Suhk Kim ◽  
Ick Soo Kim
Keyword(s):  
Crystalline Structure ◽  
Molecular Orientation ◽  
Nylon 6 ◽  
Polymer Chains ◽  
Fiber Axis ◽  
Fiber Direction ◽  
Gap Size ◽  
Metal Plates ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

We studied the effect of gap size on molecular orientation and crystalline structure of theuniaxially well-aligned nylon 6 nanofibers produced in the gap of the negatively charged metal plates. As evidenced by polarized FT-IR spectroscopy, relative intensity in several absorbance bands, including the N-H stretching, amide I, II, and III vibrations were found to be different in the parallel and perpendicular polarized FT-IR spectra. Moreover, X-ray analysis indicated that the metastable γ-form was predominant in the as-spun nylon 6 nanofiber, and was transformed into the thermodynamically stable α-form by increasing the cap size. These results suggested that the polymer chains were oriented perpendicular to the fiber direction. Molecular orientation to the fiber axis was enhanced as increasing the gap size.

Molecular Orientation and Crystalline Structure of Aligned Electrospun Nylon-6 Nanofibers: Effect of Gap Size

2010 ◽  
Vol 295 (12) ◽  
pp. 1090-1096 ◽  
Author(s):  
Naotaka Kimura ◽  
Han-Ki Kim ◽  
Byoung-Suhk Kim ◽  
Keun-Hyung Lee ◽  
Ick-Soo Kim
Keyword(s):  
Crystalline Structure ◽  
Molecular Orientation ◽  
Nylon 6 ◽  
Gap Size

scholarly journals WET SPINNING OF NYLON 6: EFFECT OF SOLVENT ON CRYSTALLINE STRUCTURE

1970 ◽  
Vol 26 (9) ◽  
pp. 399-405
Author(s):  
Tsuyoshi Kiyotsukuri ◽  
Hirozo Hasegawa ◽  
Rikizo Imamura
Keyword(s):  
Crystalline Structure ◽  
Nylon 6 ◽  
Wet Spinning ◽  
Effect Of Solvent

Ab Initio Calculation of the Crystalline Structure and IR Spectrum of Polymers: Nylon 6 Polymorphs

2012 ◽  
Vol 116 (28) ◽  
pp. 8299-8311 ◽  
Author(s):  
Claudio Quarti ◽  
Alberto Milani ◽  
Bartolomeo Civalleri ◽  
Roberto Orlando ◽  
Chiara Castiglioni
Keyword(s):  
Ab Initio ◽  
Crystalline Structure ◽  
Ir Spectrum ◽  
Ab Initio Calculation ◽  
Nylon 6

Polymer Morphology Revealed by Staining Techniques

1981 ◽  
Vol 39 ◽  
pp. 340-341
Author(s):  
A. C. Reimschuessel ◽  
V. Kramer
Keyword(s):  
Polymer Melt ◽  
Nylon 6 ◽  
Morphological Features ◽  
Negative Staining ◽  
Polymer Morphology ◽  
Crystallizable Polymer ◽  
Staining Techniques ◽  
Long Chain

Staining techniques can be used for either the identification of different polymers or for the differentiation of specific morphological domains within a given polymer. To reveal morphological features in nylon 6, we choose a technique based upon diffusion of the staining agent into accessible regions of the polymer.When a crystallizable polymer - such as nylon 6 - is cooled from the melt, lamellae form by chainfolding of the crystallizing long chain macromolecules. The regions between adjacent lamellae represent the less ordered amorphous domains into which stain can diffuse. In this process the lamellae will be “outlined” by the dense stain, giving rise to contrast comparable to that obtained by “negative” staining techniques.If the cooling of the polymer melt proceeds relatively slowly - as in molding operations - the lamellae are usually arranged in a radial manner. This morphology is referred to as spherulitic.

Electron microscopy of crystalline structure in thermotropic random copolymers

1991 ◽  
Vol 49 ◽  
pp. 1054-1055
Author(s):  
Afzana Anwer ◽  
S. Eilidh Bedford ◽  
Richard J. Spontak ◽  
Alan H. Windle
Keyword(s):  
Electron Microscopy ◽  
Crystalline Structure ◽  
Liquid Crystalline ◽  
Elevated Temperatures ◽  
Random Copolymers ◽  
Molecular Characteristics ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Identical Monomer ◽  
Periodic Layer

Random copolyesters composed of wholly aromatic monomers such as p-oxybenzoate (B) and 2,6-oxynaphthoate (N) are known to exhibit liquid crystalline characteristics at elevated temperatures and over a broad composition range. Previous studies employing techniques such as X-ray diffractometry (XRD) and differential scanning calorimetry (DSC) have conclusively proven that these thermotropic copolymers can possess a significant crystalline fraction, depending on molecular characteristics and processing history, despite the fact that the copolymer chains possess random intramolecular sequencing. Consequently, the nature of the crystalline structure that develops when these materials are processed in their mesophases and subsequently annealed has recently received considerable attention. A model that has been consistent with all experimental observations involves the Non-Periodic Layer (NPL) crystallite, which occurs when identical monomer sequences enter into register between adjacent chains. The objective of this work is to employ electron microscopy to identify and characterize these crystallites.

The extracellular matrix of echinoderm and amphibian eggs: Visualization in quick-frozen, deep-etched, and rotary-shadowed specimens

1990 ◽  
Vol 48 (3) ◽  
pp. 60-61
Author(s):  
Barry Bonnell ◽  
Carolyn Larabell ◽  
Douglas Chandler
Keyword(s):  
Extracellular Matrix ◽  
Plasma Membrane ◽  
Sea Urchin ◽  
Crystalline Structure ◽  
Cortical Granule ◽  
Two Dimensional ◽  
Small Peptides ◽  
Deep Etching ◽  
Quick Freezing ◽  
Acrosomal Reaction

Eggs of many species including those of echinoderms, amphibians and mammals exhibit an extensive extracellular matrix (ECM) that is important both in the reception of sperm and in providing a block to polyspermy after fertilization.In sea urchin eggs there are two distinctive coats, the vitelline layer which contains glycoprotein sperm receptors and the jelly layer that contains fucose sulfate glycoconjugates which trigger the acrosomal reaction and small peptides which act as chemoattractants for sperm. The vitelline layer (VL), as visualized by quick-freezing, deep-etching, and rotary-shadowing (QFDE-RS), is a fishnet-like structure, anchored to the plasma membrane by short posts. Orbiting above the VL are horizontal filaments which are thought to anchor the thicker jelly layer to the egg. Upon fertilization, the VL elevates and is transformed by cortical granule secretions into the fertilization envelope (FE). The rounded casts of microvilli in the VL are transformed into angular peaks and the envelope becomes coated inside and out with sheets of paracrystalline protein having a quasi-two dimensional crystalline structure.

Dielectric behaviour of nylon 6

1979 ◽  
Vol 76 ◽  
pp. 501-506 ◽  
Author(s):  
Shawky Boutros ◽  
Hanna A. Rizk ◽  
Adly Hanna ◽  
Melad Gerges
Keyword(s):  
Nylon 6 ◽  
Dielectric Behaviour
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