Polyamides, aromatic Nylon 6,6 copolymer

Acetal Resin Acrylic Resin Acrylic/PVC Alloy Acrylonitrile Copolymer Amorphous Nylon Aromatic Polyamide ASA... 

Acrylonitrile Copolymer Amorphous Nylon Aromatic Polyamide ASA... 

The composite systems studied by Takayanagi et al. (1980) used the polyaramides poly(p-phenylene terephthamide), PPDT, or pol.y-p-benzamide (PBA) as the reinforcing component with nylon 6 or nylon 66 as the ductile matrix polymer. Block copolymers of one of the aromatic polyamides with one of the nylon polymers were also evaluated. The blends were prepared by extruding the sulfuric acid solutions of polymers into a... 

Chem. Descrip. N-Methyl pyrrolidone CAS 872-50-4 EINECS/ELINCS 212-828-1 Uses Solvent, cosolvent In coatings, stripping/cleaning of paints/vamishes. Industrial cleaning, mold cleaning, petrochem. processing solvent for adhesives, inks, dyes, soaps, metal complexes, agric. solvent for PVAc, PVDF, PS, vinyl copolymers, nylon and aromatic polyamides and polyimides, polyesters, acrylics, PC, cellulose derivs., syn. elastomers, waxes... 

Humidity affects the strength and rigidity while also reducing electrical properties, but it serves as a plasticizer and enhances toughness. The novel types like 6-10, 11 and 12 are definitely more expensive, but they are unique due to lower sensitivity to water as well as improved chemical resistance. The water repellency increases with the length of the methylene groups. There are also several copolymers, some within the family, like 6-6/6 or 6-6/6-10. Other Nylons of limited utility are termed 4, 7, 8 or 9. Novel developments are mainly in the aromatic polyamides like Kevlar... 

There is still much interest in nylon 6 derived by classical polycondensation and lactam ring-opening routes. In addition, in the past few years interest has centred on the synthesis and characterization of aromatic polyamides for use as high temperature materials and for their liquid crystal properties. In addition, work on copolyamides has also been growing with emphasis on block and graft copolymer systems containing aromatic amide blocks. 

The thermo-oxidative cross-linking of nylon 6 and the resistance to oxidation of its graft copolymers with polyacrylonitrile have been studied. The thermal and thermal oxidative degradation of poly(/w-phenylene isophthalamide) and other aromatic polyamide compositions, together with comparative studies on the mechanisms of degradation of poly(p-benzamide) and poIy(p-phenylene terephalamide) have all been reported. 

NYLON (INCLUDING AROMATICS) POLYIMIDES POLYAMIDE-IMIOES THERMOPLASTIC POLYESTERS (INCLUDING AROMATICS) POLYSULFONES POLYSTYRENE / COPOLYMERS (EXCEPT ABS)... 

Engineering polymers are often used as a replacement for wood and metals. Examples include polyamides (PA), often called nylons, polyesters (saturated and unsaturated), aromatic polycarbonates (PCs), polyoxymethylenes (POMs), polyacrylates, polyphenylene oxide (PPO), styrene copolymers, e.g., styrene/ acrylonitrile (SAN) and acrylonitrile/butadiene/styrene (ABS). Many of these polymers are produced as copolymers or used as blends and are each manufactured worldwide on the 1 million tonne scale. 

A number of polyamide copolymers are known to have practical uses. The copolymers include those with different amides such as poly(caprolactam-co-laurolactam), poly(2,2,4-trimethyl-1,6-hexandiamine-co-2,4,4-trimethyl-1,6-hexandiamnie-co-1,4-benzendicarboxylic acid), poly(s-caprolactam-co-hexamethylene diamine-co-terephthalic acid), poly(hexamethylenediamine-co-terephthalic acid-co-isophthalic acid), etc. The addition of longer alkyl chains in an aromatic polymeric amide may improve some mechanical properties, but thermal resilience is in general reduced. For example, poly(hexamethylenediamine-co-m-xylylenediamine-co-isophthalic acid-co-terephthalic acid) starts decomposing at about 310° C, significantly lower than Nomex , for example. The same decrease in the decomposition temperature is seen for other mixed copolymers such as nylon 12 copolymers that include cycloaliphatic and aromatic segments. 

STRUCTURE As described in several articles md patents/ this type of aromatic nylon resin is a polyamide consisting of varying portions of aliphatic and aromatic units. Hexamethylene diamine is the main aliphatic component, which may be augmented by various amounts of adipic acid. The main aromatic component is terephthalic acid, which may be augmented by lesser amounts of isophthalic acid. Depending on relative composition, Amodel (nylon 6,6 copolymer) resins can be regarded as co- and terpolymers consisting of repeat units of nylon 66, nylon 6T, and nylon 61 —poly (hexamethylene isophthalamide). The major potential difference of other aromatic nylons, such as Ultramid T from BASF, is the presence of the 61 component. 

Nylon 6 copolymer Nylon 6,6 Nylon 6,10 Nylon 6,12 Nylon 11 Nylon 12 Nylon MXD6 Polyamides, aromatic Keylar... 

Sebastian Munoz-Guerra completed his Ph.D in Organic Chemistry in 1974 at the University of Seville. After postdoctoral work on crystal structure and morphology of non-conventional nylons, he initiated research on synthesis and characterization of bio-based polymers and copolymers. Since 1987, he is full Professor in Chemical Engineering at the Technical University of Catalonia in Barcelona. His current research is focussed on the development of polyesters, polyamides and polyurethanes derived from carbohydrates with special attention paid to industrial aromatic polyesters, as well as on modification of microbial biopolymers with therapeutic interest. He has authored more than 200 peer reviewed papers and several book chapters, and has been granted more than 15 patents on these issues. 

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