Mais conteúdo relacionado

Similar a 202015070.pptx(20)



  1. Presentation on the Patient of Aromatic Polyamide SUBMITTED BY: MUHTASIM FUAD ID: 202015070 DEPT: TEM
  2. Abstract:  Aromatic polyamides are high performance materials with superior thermal and mechanical properties which make them extremely useful for advanced technologies. These polymers can be transformed into high- tensile strength synthetic fibers and into flame and cut-resistant materials that have technological applications in the field of coatings and fillers in the aerospace and armaments industry, in asbestos substitutes, electrical insulation, bullet-proof body armor, industrial filters, and sports fabrics, among others.
  3. Commercial Polyphthalamides, Poly(Amide Imide)s and Wholly Aromatic Polyamides  According to the US Federal Trade Commission (FCT), wholly aromatic polyamides (aramids) are synthetic poly- amides in which at least 85% of amide groups are bound directly to two aromatic rings. Scheme (1) shows the first commercialized aramids, which are the most important from an economic point of view, their constituent monomers, and some of the tradenames they have used over the last 40 years.
  4. RECENT AROMATIC POLYAMIDE PATENTS Safety and Resistant Materials :  Zhu et al. have described a yarn for use in arcwelding and flame protection fabrics with resistance to tears and abrasion that comprises a modacrylic, p-aramid and maramid fiber. Five years ago, Ghorashi et al. reported on wicking fabrics comprising aramid crystallized yarns that are particularly useful in protective garments, i.e. for firefighters, etc. Nowadays, the aeronautic industry is demanding lightweight, flexibility and flameproof materials for aircraft construction. Along these lines, Forsten and Khan [29] have reported a flame barrier paper, based on PMPI fibrids and mica, which meet these requirements.
  5. Membranes:  Ekiner and Simmons reported on membranes used to separate fluids for the production of oxygen-enriched air, nitrogen-enriched air, for the separation of carbon dioxide from hydrocarbons, and the separation of hydrogen from various petrochemical and oil refining streams. The membranes are made with blends of polyamides, polyimides and polyimide-amide polymers, Scheme (5). They show high strength, chemical resistance, and are suitable for high pressure and temperature applications. applications.
  6. Biomaterials and Polyamide Systems for Medical Applications:  Polyamides, such as polymers with the amide linkage, can be formulated to mimic the natural behavior of hair, even in the presence of humidity. Shirakashi et al. have very recently reported on partially aromatic polyamides containing hexamethylene diamine and terephthalic acid monomers used together with an aliphatic polyamide in artificial hair and wigs. In the treatment of disease, Sugiyama et al. [42] have developed a pyrrole-imidazole polyamide with the ability of alkylating and recognizing a a specific DNA base sequence. This occurs via a vinyl linker at the end of the pyrroleimidazole polyamide that has a cyclopropylindone, which in turn allows gene-level anticancer drug development for the inhibition of the expression of a specific gene.
  7. REFERENCES:  [1] Fink JK. High performance polymers. William Andrew Inc., Norwich, 2008.  [2] Rules and Regulations Under the Textile Fiber Products Identification Act ( pdf), Part 303.7 (Generic names and definitions for manufactured fibers), US Federal Trade Commission (FCT) 2002.  [3] Vollbracht L. Aromatic polyamides comprehensive polymer science. In: Eastwoond GC, Ledwith A, Russo S, Sigwalt P, Eds. Allen G, Bevington JC, Chairmans of the Editorial boards. Pergamon Press: Oxford 1989.