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Advanced Polyphthalamide (PPA) Metal Replacement Trends

SpecialChem / Feb 24, 2009

Thermoplastic, polyphthalamide (PPA) is a high performance polyamide (nylon). Polyamides, which encompass a wide variety of products, are polymers having an amide linkage in the polymer backbone produced from the copolymerization of a diacid and a diamine. The most notable of these are PA66 (nylon 66) and PA6 (nylon 6) which represent the vast majority of nylon produced in the world today. These nylons are deemed to be aliphatic as there are no aromatic ring structures along the polymer chain's backbone. Polyphthalamide (PPA), a member of the nylon family, is a semi-crystalline material formed from a diacid and a diamine. However, a portion of the diacid segment is replaced with an aromatic component, terephthalic acid (TPA) or isophthalic acid (IPA), which adds an aromatic ring structure to the polyamide chain, forming a semi-aromatic polyamide. According to ASTM D5336, PPA is defined as "a polyamide in which the residues of TPA or IPA or a combination of the two comprise at least 55 molar percent of the diacid portion of the repeating structural units in the polymer chain."

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