Synthesis and characterization of organosoluble copolyimides based on 2,2‐Bis[4‐(4‐aminophenoxy)phenyl]propane, 2,2‐Bis[4‐(4‐aminophenoxy)phenyl]hexafluoropropane and a pair of commercial aromatic dianhydrides |
| |
Authors: | Chin‐Ping Yang Kuei‐Shi Hung Ruei‐Shin Chen |
| |
Abstract: | Organosoluble homopolyimides (PIs) and copolyimides (CoPIs) were synthesized from 2,2‐bis[4‐(4‐aminophenoxy)phenyl]propane (BAPP) or 2,2‐bis[4‐(4‐aminophenoxy)phenyl]hexafluoropropane (6FBAPP) and six kinds of commercial aromatic dianhydrides (PMDA, II a ; BTDA, II b ; BPDA, II c ; ODPA, II d ; DSDA, II e ; 6FDA, II f ). Although BAPP and II d∼f could prepare three kinds of soluble PIs ( III‐A d∼f ), likewise 6FBAPP and II c∼f could prepare four PIs ( III‐B c∼f ), the insoluble PIs were synthesized from these two diamines and other dianhydrides. However, soluble CoPIs could be prepared by alternative copolycondensation from a pair of dianhydrides of soluble PIs and insoluble PIs in certain molar ratios (m1/m2). The ratios of m1/m2 of BAPP/PMDA series CoPIs ( IV m1(d–f)/m2a ) ranged from 3–5, but ratios of 6FBAPP/PMDA series CoPIs ( V m1(c∼f)/m2a ) decreased to 2–3. The m1/m2 of the BAPP/BTDA and 6FBAPP/BTDA series CoPIs were 2, while the BAPP/BPDA series were between 1–2. Composition, solubility, tensile properties and thermal properties of these CoPIs synthesized via a two‐stage thermal cyclodehydration were determined and were compared with their corresponding PIs. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 3954–3961, 2000 |
| |
Keywords: | polyimide copolyimide organosoluble 2,2‐bis[4‐(4‐amino‐phenoxy)phenyl]propane 2,2‐bis[4‐(4‐aminophenoxy)phenyl]hexafluoro‐propane |
|
|