Aromatic Conjugated Polymers

The partially aromatic PAs are exclusively made of die diamine-diacid type and not die amine-acid type. The aromatic diamines, similar to phenylene diamines, color easily and dieir polymers are conjugated, having a golden brown color. The aromatic diacids used in the formation of partially aromatic PAs are mainly terephthalic and isophthalic acids. Starting with the diacids, the PA salt is made first and with this the salt prepolymers are prepared. The prepolymerization is usually carried out in an autoclave to prevent die sublimation of the reactants. In a laboratory synthesis it would be preferable to avoid this autoclave step as one is not always available. It is possible to start with the more reactive esters, such as diphenyl isophtiialate, or with the acid chlorides starting with the reactive isocyanates is, in principle, also possible. The terephthalic and isophthalic acids are also used to modify PA-6,6 and PA-4,6 to more dimensionally stable copolymers.6,18... 

Abstract Synthesis of carbon adsorbents with controlled pore size and surface chemistry adapted for application in medicine and health protection was explored. Conjugated polymers were used as carbon precursors. These polymers with conjugated double bonds C = C have high thermal stability. Formation of sp carbon structures occurs via condensation and aromatization of macromolecules. The structure of carbon materials obtained is related to the structure of the original conjugated polymer, thus the porous structure of carbon adsorbents could be controlled by variation of the conjugated polymer precursor. 

Berlin, A. A., B. I. Liogon kii, V. P. Parini, and M. S. Leikina Polymers with conjugated double bonds and heteroatoms in the chain. XXXV. Linear aromatic polymers with methylene groups between the benzene rings. Vysoko-mol. Soed. 4, 662 (1962) [4, 221 (1962)]. 

During the last decade polyconjugated systems have gained great interest, and tremendous efforts have been put in the synthesis of linear and aromatic conjugated polymers. In order to circumvent the problems of inprocessability the use of substituted polymers or the preparation via precursor routes was propagated... 

Pendant Aromatic Rings Aromatic (conjugated unsaturated rings such as fliose of benzene, C H ) rings attached to the main chain of a polymer molecule. 

Among various photoresponsive compounds, dithienylethene (DE) derivatives are the most feasible photochromic materials due to their outstanding fatigue resistance, thermal stability, and reversible properties [65-67]. Addition of this photoresponsive moiety into an aromatic conjugated polymer is attractive as a method of dynamic control of luminescence through photoisomerization-driven... 

J. Oguma, R. Kawamoto, H. Goto, K. Itoh, K. Akagi, Magnetically forced alignment of liquid crystalline aromatic conjugated polymers and their electrical and optical anisotropies. Synth. Met. 119, 537-538 (2001)... 

T. Yamamoto and H. Kokubo. Eleteroaromatic and aromatic conjugated polymers S5uithesized by organometal-lic coupling - preparation and selected electrochemical properties. Electrochim. Acta 50(7-8), 1453-1460 (2005). 

Since side-chain-type LC polyacetylene derivatives were first synthesized [10-18], various types of LC conjugated polymers have been synthesized and evaluated from the standpoint of their electrical and optical properties [19-46]. Among them, LC aromatic conjugated polymers, including LC polythiophene derivatives, have been of recent interest because they are available for linearly polarized luminescent materials, and also anisotropically conducting materials [28-30, 40-53]. 

The increase in the activity of polymer aromatic compounds with increasing temperature can serve as a confirmation of the correctness of the assumption that such substances can be high-temperature stabilizers in the case of relatively small conjugated chains. In this case the values of Egx and Eact rather great hence higher temperatures are... 

Watanabe K, Suda K, Akagi K (2013) Hierarchically self-assembled helical aromatic conjugated polymers. J Mater Chem C l(16) 2797-2805. doi 10.1039/c3tc00045a... 

Linear and aromatic conjugated polymers have gained great interest in last decade for several reasons. The problem of inprocessibility was circumvented either by the use of substituted monomers [e.g. poly(alkylthiophene) (i), poly(al-kylphenylene) (2), etc.] or by preparation via precursor polymers as shown for polyacetylene (3), poly-p-phenylene (4) and poly(arylene vinylene) (5). The latter ones are mainly prepared via sulfonium polymers in a condensation reaction. This gives bad control of the average molar mass and of the molar mass distribution. 

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