Abstract
Soluble polyimides having pendant carboxyl groups were prepared by a direct one-pot polycondensation of various acid dianhydrides with 3,5-diaminobenzoic acid and bis[4-(3-aminophenoxy)phenyl]sulfone in the presence of γ-valerolactone/pyridine catalyst in 1-methyl-2-pyrrolidone (NMP)/toluene mixture at 180°C. The pendant carboxyl groups were blocked with photopolymerizable (meth)acrylamides, N-[3-(dimethylamino)propyl]acrylamide (DMAPAA), N-[3-(dimethylamino)propyl]methacrylamide (DMAPMA), or N-[3-(diethylamino)propyl]methacrylamide (DEAPMA), through ionic bonding at room temperature. The ionic-bonded photosensitive polyimide films containing photosensitizer Michler's ketone (MK) and ethylene glycol dimethacrylate (EGDMA) as an external multifunctional cross-linker gave negative-tone behavior by near-UV irradiation followed by development with 10% aqueous NaOH at 25°C. The SEM photograph of the resultant images showed fine patterns (line/space 20/20 μm) with ∼15 μm in film thickness. The sensitivity of photosensitive polyimides with DMAPAA or DMAPMA was higher than that of photosensitive polyimides with (meth)acrylate esters such as 2-(dimethylamino)ethyl acrylate (DMAEA), 3-(dimethylamino)propyl acrylate (DMAPA), 2-(dimethylamino)ethyl methacrylate (DMAMA), and 2-(diethylamino)ethyl methacrylate (DEAMA).
| Original language | English |
|---|---|
| Pages (from-to) | 59-73 |
| Number of pages | 15 |
| Journal | Reactive and Functional Polymers |
| Volume | 56 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2003 Jul 1 |
| Externally published | Yes |
Keywords
- Alkaline developability
- Aminoalkyl (meth)acrylamides
- Negative photosensitive polyimides
- One-pot polycondensation
- Photopolymerization
- Polyimides with pendant carboxyl groups
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Biochemistry
- Chemical Engineering(all)
- Polymers and Plastics
- Materials Chemistry