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Polymers
Published in Bryan Ellis, Ray Smith, Polymers, 2008
Additives: Fillers increase rigidity under load and reduce mould shrinkage. Glass/carbon fibres give rigidity and temp. resistance; conductive fillers (carbon black) added for anti-electrostatic props.; flame retardants and impact modifiers (ABS resins) also used General Information: Amide groups may be detected by ir or nmr spectroscopy. Nylon 12 may be hydrolysed by acid to the monomer 12-aminododecanoic acid. Complete identification of monomers and ratios present may be carried out by nmr. Nylon 12 differs from Nylon 6 and Nylon 6,6 in that it possesses high dimensional stability over a wide range of humidity conditions. Low water absorption gives rise to substantially constant mech. and electrical props. It exhibits excellent toughness at low temps. combined with good stress crack resistance. These props. make it particularly suitable for tube and hose applications in the automobile industry, and for precision injection mouldings Morphology: Crystallinity 26% [25]. Hexagonal, a 4.8, b 4.8, c 232.1 [27]. Pseudohexagonal, a 4.79, b 31.9, c 9.58, p 120° [28]. Monoclinic, a 4.90, b 4.67, c 32.1, g 121.7°. [29] Oriented lamallae form large anisotropic domains on highly oriented substrates of syndiotactic polypropylene [56]
Monomers, Polymers, and Plastics
Published in James G. Speight, Handbook of Petrochemical Processes, 2019
Nylon 12 (polylaurylamide) is produced in a similar way to nylon 6 by the ring-opening polymerization of laurolactam. The polymer has a lower water capacity than nylon 6 due to its higher hydrophobic properties. The polymerization reaction is slower than for caprolactam. Higher temperatures are used to increase the rate of the reaction.
Industrial Polymers
Published in Manas Chanda, Plastics Technology Handbook, 2017
Nylon-12 is produced by the ring-opening polymerization of laurolactam (dodecyl lactam) such as by heating the lactam at about 300°C in the presence of aqueous phosphoric acid. Unlike the polymerization of caprolactam, the polymerization of dodecyl lactam does not involve an equilibrium reaction. Hence, an almost quantitative yield of nylon-12 polymer is obtained by the reaction, and the removal of low-molecular-weight material is unnecessary.
Digital interlooping: 3D printing of weft-knitted textile-based tubular structures using selective laser sintering of nylon powder
Published in International Journal of Fashion Design, Technology and Education, 2019
The SLS process is compatible with a variety of Nylon based powders. Nylon is a popular engineering thermoplastic due to its lightweight, strong and flexible properties because of this it has been used by numerous designers to successfully print articulating structures.Nylon: Nylon 12 (PA12) in particular has outstanding mechanical properties including low moisture absorption, good dimensional stability and superior flexibility. The Nylon 12 3D printed bikini developed by Continuum Fashion makes use of thousands of SLS Nylon circular components interconnected by thin spring like structures allowing the piece to hold its form whilst still being flexible. More recent examples include three ASFOUR’s collaboration with Bradley Rothenberg to create a Spring/Summer 2016 dress in which SLS Nylon 12 is used to create incredibly fine interlocking lattice structures.
Impact properties of thermoplastic composites
Published in Textile Progress, 2018
Ganesh Jogur, Ashraf Nawaz Khan, Apurba Das, Puneet Mahajan, R. Alagirusamy
Polyamide (PA) when reinforced with fibres, is widely used in load-bearing applications and structural components. Figure 6 illustrates one of the polyamide chemical structures i.e., nylon 6,6. PA has better strength and stiffness over PP and PE and also shows excellent temperature performance up to 200 °C. PA has good thermal stability and melts at temperatures 215 °C–220 °C [6]. Nylons with various chemical structures are available, namely:nylon 6, (polycaprolactam, the polymamide formed from the C6 compound, caprolactam)nylon 6.6, (the polyamide formed by the condensation polymerization reaction between two C6 compounds, adipic acid and hexamethylene tetramine)nylon 6.10, (the polyamide formed by the condensation polymerization reaction between the C10 compound sebacoyl chloride and hexamethylene tetramine)nylon 6.12, (the polyamide formed by the condensation polymerization reaction between the C12 compound dodecanedioic acid and hexamethylene tetramine)nylon 11, (the polyamide formed from the C11 compound, undecanolactam)nylon 12, (the polyamide formed from the C12 compound, laurolactam) andnylon MXD6 (a polyamide, distinctive because it contains an aromatic ring in each repeat unit within the polyamide backbone chain, that is formed by the condensation polymerization reaction between the C6 compound, adipic acid, and m-xylenediamine)