Kinetic studies of polyamide-imide synthesis

✍ Scribed by K. S. Ho; L. W. Chen

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 189 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19970715)35:9<1703::aid-pola11>3.0.co;2-9

✦ Synopsis

To understand the kinetic of synthesis of polyamide-imide (PAI) via pchlorophenol-(PCP) blocked 4,4 -diphenyl methane diisocyanate (MDI) with trimellitic anhydride (TMA), a series of reactions of blocked MDI with excess phthalic anhydride (PA) and benzoic acid are designed. PCP-blocked phenyl isocyanate (BPI) which also released isocyanate at higher temperatures was used as a model compound for BMDI. The dissociation constants of BPI and BMDI in the presence of excess PA or BA was measured by collecting the evolved CO 2 . The effect of the catalyst concentration and temperatures were combined by a Hostettler equation.