## Abstract A novel hyperbranched polymer (**3**) was prepared by copolymerization of triโaldehyde moieties with azo chromophores having two active methelene groups, from "A~2~+B~3~" approach based on simple Kneovenagel reaction. For comparison, its analogue linear polymer (**5**) was also synthesi
Synthesis and properties of a novel polyazomethine, the polymer with high photoconductivity and second-order optical nonlinearity
โ Scribed by Sang Chul Suh; Sang Chul Shim
- Book ID
- 117537181
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 214 KB
- Volume
- 114
- Category
- Article
- ISSN
- 0379-6779
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## Abstract A highly thermally and temporally stable, secondโorder, nonlinearโoptical polyimide with an Xโtype chromophore (2โ{4โ[4,5โdi(4โnitrophenyl)imidazolyl]phenyl}โ4,5โdi(4โaminophenyl)imidazole) was synthesized by the Michael addition reaction. The structure of the prepolymer was characteriz
A thermal stable aromatic polyimide (PI) with side-chain second-order nonlinear optical (NLO) chromophores has been developed. The PI was prepared by the ring-opening polyaddition of 4,4ะ-(hexafluoroisopropylidene)diphthalic anhydride with a new diamine having two N-ethyl-N-[4-[(6-chlorobenzothiazol