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Thermally stable hyperbranched nonlinear optical polyimides using an “A2+B3” approach
- Source :
-
Materials Chemistry & Physics . May2011, Vol. 127 Issue 1/2, p107-113. 7p. - Publication Year :
- 2011
-
Abstract
- Abstract: To obtain nonlinear optical (NLO) polyimides exhibiting excellent thermal stability and large electro-optical (EO) coefficients, we synthesized a series of novel hyperbranched polyimides from a tris(ether anhydride) [1,1,1-tris[4-(3,4-dicarboxyphenoxy)phenyl]ethane trianhydride (III)] and a difunctional chromophore [(2,4-diamino-4′-(4-nitrophenyldiazenyl)azobenzene) (DNDA)], through ring-opening polyaddition at room temperature to form poly(amic acid)s (PAAs), followed by poling/curing process. The presence of the imide rings in the hyperbranched NLO polymers imparted them with excellent thermal stability. Moreover, their highly hyperbranched architectures resulted in site-isolation effects, which restricted the aggregation of the chromophore units. All of these hyperbranched polymers exhibited larger EO coefficients (14.6–17.2pmV−1) and better temporal stability at 120°C than those of linear NLO polymers. In addition, we also observed waveguide properties for hyperbranched NLO polymers (3.4–4.6dBcm−1 at 1310nm). Relative to the analogous linear NLO polyimide, the hyperbranched NLO polyimides exhibited superior temporal stability, larger EO coefficients, and lower optical losses. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 127
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 59453903
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2011.01.042