Record number :
1738918
Title of article :
Preparation and characterization of nanoporous films derived from alicyclic copolyimides having pendent poly(propyleneglycol) groups
Author/Authors :
Choi، نويسنده , , Jiyoung and Takayama، نويسنده , , Toshio and Yu، نويسنده , , Hwan-Chul and Chung، نويسنده , , Chan-Moon and Kudo، نويسنده , , Kazuaki، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2012
Pages :
11
From page :
1328
To page :
1338
Abstract :
Nanoporous films were prepared with alicyclic copolyimides (coPIs) having polypropylene glycol (PPG) side chains by way of spontaneous phase separation in the film forming process and the subsequent thermal degradation of PPG moieties. PIs having various content (6.5, 11.9, 26.3, 52.7 wt%) and different length (Mw = 1.2 × 103 and 2.4 × 103) of PPG side chains were examined in order to clarify the relationship between chemical structure and pore characteristics. Nanopores were formed by heating the coPI films at 200 °C for 9 h under slightly reduced pressure. The size and the number of the pores observed by SEM varied depending on the content and molecular weight of PPG moieties. In many cases, the pore size was larger than those of the reported values for related aromatic copolyimide films. The dielectric constant of the nanoporous films ranged from 2.52 to 3.38.
Keywords :
Nanoporous film , Graft copolymer , Alicyclic polyimide
Journal title :
Polymer
Journal title :
Polymer
Serial Year :
2012
Link To Document :
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