Organo-soluble polyimides

All stages of these polyimide syntheses proceeded homogeneously and led to the formation of organo-soluble polyimides free (infrared spectroscopy) of noncyclised units. General properties of the organo-soluble methyl- and N-phthalirnide-substituted polyimides are given in Table 5.11. 

Y. Yang, Z.-K. Zhu, J. Yin, X.-Y. Wang, and Z.-E. Qi, Preparation and properties of hybrids of organo-soluble polyimide and montmorillonite with various chemical surface modification. Polymer, 40 (1999), 4407-14. 

Yang, Y., Zhu, Z.K., Yin, J., Wang, X.Y., Qi, Z.E., 1999. Preparation and properties of hybrids of organo-soluble polyimide and montmoriUonite with various chemical surface modification methods. Polymer 40, 4407—4414. 

Yu Y. El., Yeh J. M., Liou S. J. and Chang Y. P. (2004b), Organo-soluble Polyimide (TBAPP-OPDA)/clay Nanocomposite Materials with Advanced Anticorrosive Properties Prepared from Solution Dispersion Technique. Acta ATafer, 52,475-86. 

The molecular design of organo-soluble aromatic polyimides used in the optical applications has been focused on the issue to interrupt the electron conjugation along... 

Differences in the linkages and conjugation of the dianhydrides and diamines also bring differences in crystallinity, organo-solubility, color and processability of the films. A complete relationship between the structures and properties can be established and utilized to design the polyimide architectures for various optical applications. 

We have investigated many macroscopic properties of the organo-soluble aromatic polyimide films and all of them exhibit anisotropic behaviors which are closely associated with the anisotropic structure in the films. One question still remains is whether we can find a common physics background to describe these properties. If we consider the fi-ee energy (or internal energy or energy) term, the first derivative of... 

In summary, we have briefly reviewed our understanding in the development of organo-soluble aromatic polyimides via molecular design and architecture control and the establishment of relationships between the anisotropic structure and properties in the films. These anisotropic structures and properties are also found to be film thickness and molecular weight dependent. In particular, the LOA behavior has led to a invention where these aromatic polyimide films can be used as UNB retardation compensators in LCDs to increase viewing angles. This technology initiated from our researches has been commercialized to produce compensators for wide applications in LCDs,... 

Novel Organo-Soluble Fluorinated Polyimides for Optical, Microelectronic, and Fiber Applications... 

To investigate the additional effect of triphe-nylamine (TPA) moieties on >C(CF3)2 containing polyimides, Liou et al. [183] synthesized a series of novel organo-soluble aromatic polyimides bearing pendant methoxy-substituted TPA moieties. They also prepared the same polyimide series without the >C(Cp3)2 group to compare their physical properties. A synthetic scheme of the TPA containing polyimide series is shown in Scheme 3.19. All of the... 

Another kind of 6FDA-based organo-soluble fluoro-polyimide membranes with high thermal stability was synthesized by Li and co-workers [219]. They used two types of diamines, 4,4 -methylene diamine (MDA) and 4,4 -diamino-3,3 -dimethyldiphenylmethane... 

D.J. Liaw, EC. Chang, Highly organo-soluble and flexible polyimides with color lightness andtransparencybasedon2,2-te[4-(2-trifluoromethyl-4-aminophenoxy)-3,5-di-methylphenyljpropane, J. Polym. Sci., Part A Polym. Chem. 42 (22) (2004) 5766-5774. 

C.P. Yang, Y.-Y. Su, M.-Y. Hsu, Organo-soluble and hghtly-colored fluorinated polyimides based on 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl] hexafluoropropane dianhydride and aromatic Bis(ether amine)s bearing pendent trifluoro-methyl groups, Polym. J. 38 (2006) 132-144. 

C.P. Yang, S.H. Hsiao, C.L. Chung, Organo-soluble, low-dielectric-constant fluorinated polyimides based on 2,6- w(4-amino-2-triflu-oromethylphenoxy)naphthalene, Polym. Int. 54 (4) (2005) 716-724. 

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