Polyamide monofilament

Figures 11 to 13 are dark field micrographs of 66 polyamide monofilaments. Figure 11 show an Ag-S stained filament. Silver sulfide precipitates, which appear as black areas (as they did in bright field images) as well as polyamide crystallites (bright spots) are visible. Figure 12 corresponds to a type 4 fiber (with skin-core morphology) where there is a lower density of crystallites in the skin region. Figure 13 corresponds to the case of type 5 fiber which has smaller crystallites.

Figure 4.2 Structural variations in textiles, yams, and fibers (a) woven denim fabric 60 x, (b) knitted jersey 60 x, (c) chenille yam 57 x, (d) high-twist yam 56 x, (e) wool fiber 210 x, and (f) polyamide monofilament 210 x.

Figure 2.32. Effect of polyaniline content in PVC/ Figure 2.33.Fatigue resistance of polyamide monofila-...

Polyamide monofilament sutures show smooth surhices wifti a circular cross-section before implantation (see Fig. lb). No fibrous tissue cqisule was observed on the suture surface or around the knot post implantation. This is contributed to its smooth surface characteristic. However a closer examination of the opened knot shows flattening of the knot region (see Fig. 7). This is attributed to the ductile structure of polyamide sutures. It shows permanent deformation due to lateral forces exerted during loading. The rupture of the melt-spun synthetic fibres like polyamide is dominated by yield. Plastic yield of material causes the crack to open into a V-notch, vduch propagates steadily into the specimeiL This typical ductile fixture was seen at the broken ends, alter tmisile tests, both before and er implantation (see Fig. 8). 

Flex-Line Polyamide monofilaments, PA Elf Atochem Deutschland... 

Fig, 3.3. Strength of 66 polyamide monofilaments and bundles of filaments as a function of loading rate (after Coleman et al, [81). 

Fig. 8.45. Electron Micrograph of ultrathin cross-section through voided area of drawn 6 polyamide monofilament (Courtesy H. Hendus, 1831). Magnification 4800 x.

Nylon A class of synthetic fibres and plastics, polyamides. Manufactured by condensation polymerization of ct, oj-aminomonocarboxylic acids or of aliphatic diamines with aliphatic dicarboxylic acids. Also rormed specifically, e.g. from caprolactam. The different Nylons are identified by reference to the carbon numbers of the diacid and diamine (e.g. Nylon 66 is from hexamethylene diamine and adipic acid). Thermoplastic materials with high m.p., insolubility, toughness, impact resistance, low friction. Used in monofilaments, textiles, cables, insulation and in packing materials. U.S. production 1983 11 megatonnes. 

A study was carried out to prepare antibacterial polyamide fibres by the modification of standard monofilament yam with nitrofuiylo, to examine the liberation of biocides into water and to verify the antibacterial effects of the modified fibres by in vitro testing using Gram-positive and Gram-negative bacterial strains characteristic of hospital conditions. 22 refs. 

Nylon. Nylon is a trade name for high-molecular weight polyamides that result from condensation polymerization of dibasic acids and diamines, or from u)-amino acids. Nylon can be extruded from a melt as monofilaments, or spun from a solution of formic acid, HCOOH, and phenol, C5H5OH. The resulting fibers have a low density, are elastic and lustrous, and mass for mass are stronger than steel. However, they are also low melting and difficult to dye. 

Chem. Descrip. High m.w. polyamide/polyester copolymers Uses Hot-melt adhesive for extrusion of fusible film, monofilament, netting, web, and multifilament, for thin film fusible coatings, for applic. by disp. techniques used in textile industry, adhesive for fusion bonding of textiles, leather, wood, glass, and metals, and misc. applies, incl. automotive interiors, belts, color cones., hats, hose construction, rainwear, shoes, television tubes, wire coating, etc. 

Classification Thermoplastic polyamide Formula [NH(CH2)6NHCO(CH2)7CO]n Properties Solid dens. 1.080 m.p. 205 C Uses Thermoplastic resin for inj. molding and extrusion applies., film, extruded stock for machining brush bristles industrial monofilament cable/wire jacketing elec./automotive parts Manuf./Distrib. Aldrich http //www.sigma-aldrich.com... 

CAS 24936-74-1 26098-55-5 Synonyms Nylon 6/12 PA 612 Polyamide 612 Poly (hexamethylenedodecanediamide) Classification Thermoplastic polyamide Formula [NH(CH2)6NHCO(CH2)ioCO]n Properties Solid dens. 1.07 kg/l m.p. 210 C tens, str. ( yield) 60 MPa Uses Thermoplastic resin for molding, extrusion, films, brush bristles, industrial monofilament, cable/wire jacketing, elec./automotive parts food pkg. 

Polyamides are another group of highly polar polymers which are successfully plasticized with sulfonamides. Sulfonamides and polyamides have similar ranges of solubility parameters. Figure 2.33 shows the effect of addition of N-butyl benzene sulfonamide on fatigue resistance of monofilaments. ... 

Each fabric has its own particular characteristic vtiiich can be used to advantage in the filtration process. Thus the smooth-surfaced mono- and multifilament (high-twist) cloths are particularly suited to the liquid environment, in the separation of sticky, clogging substances such as sludges or colloids. Retention of such small material depends on a rapidly formed surfece layer of particulates in the reported use of monofilament polyamides for effluent treatment plants [Grove Daveloose, 1982]. Apparently in this application, change firom q>un fibre to woven cloth increased the cloth lifetime from 3 months to 2.5 years The adhesive nature of such solids may be modified by treatment with polyelectrolytes. Quite opposite results can also be experienced, however, where the three-dimensional capture characteristics of staple fibre material is the best option. 

Sutures remain the most common method of tpproximating the divided edges of tissue (1). Sutures are categorised by size, material, design and behaviour. Absorbable and nonabsorbable materials are further divided into synthetic versus natural products, some of vdiich can be fabricated in braided and/or monofilament form. Non-absorbable sutures have played an important role in the development of surgical procedures, generally made of silk, polyamide, polyester, polypropylene, polyethylene and poly(tetrafluoroethylene) (2). 

Figure 2. SEM micrographs of a woven fabric made of PET monofilaments (left) and of a woven fabric made of polyamide multifilament yarn (right).

Thomas SN, Hridayanathana C. The effect of natural sunlight on the strength of polyamide 6 multifilament and monofilament fishing net materials. Fish Res 2006 81 (2-3) 326-330. 

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