Polyamide synthesis by ester aminolysis. I. A new route for nylon-6,6 synthesis

✍ Scribed by F. Jouffret; P.-J. Madec

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 580 KB
• Volume: 34
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19960915)34:12<2363::aid-pola10>3.0.co;2-6

✦ Synopsis

A new route for nylon-6,6 synthesis has been studied. The process is grounded on the synthesis of an a-amino w-ester monoamide precursor (AME-6,6) easily available in reacting in the bulk hexamethylene diamine and dimethyl adipate a t a low temperature (T = 50°C) preferably in the presence of a phenol derivative. In such conditions AME-6,6 precipitates with a very good yield (90-95%). One of the greatest advantages of AME-6,6 is to keep the stoichiometric balance for further polyamidation; that is not the case in other processes. Moreover AME-6,6 is very stable, e.g., even stored a t room temperature under air during 50 days. Polyamides-6,6 have been obtained from AME-6,6 (used freshly prepared or after storage) in glass laboratory reactors by direct heating under vacuum (T = 270°C) with number-average molecular weights of roughly 20,000.