Thermally stable polymers containing

ABSTRACT A new class of photosensitive, thermally stable polymers containing photo-labile aromatic amide linkages has been prepared. These polymers can be used to provide lithographic relief images for printing, etch masks for microcircuit fabrication and as contrast media for optical information storage. 

Thermally stable polymers containing titanacyclobutene units have been synthesized by central carbon radical alkylation (Section 2.12.9.2.4) of a l,4-bis( ]3-propargyltitanium)benzene complex. The reaction is remarkably clean and efficient subsequent protonation by ethereal HC1 produces the unsaturated organic polymer and Cp 2TiCl2 <2005MI511>. 

This polymer membrane normally consists of an ion exchange polymer or a composite made from a chemically and thermally stable polymer containing an ion conducting liquid having a high boiling point. Polymer electrolyte membranes are made from the following classes of polymers. 

Research activities in the area of PODs containing aromatic groups have been centered around the production of highly processible, soluble, and thermally stable polymers. In this particular class of PODs, the imide-and phenylene-containing backbones have been widely explored. 

A novel photoactive thermally stable polymer (xv) containing the triazine moiety has been synthesized by Khoee and Zamani [27] by the reaction of A,A-(4,4 -oxy bis (4,l-phenylene))-bis-(l,3-dioxo-l,3-dihydroisobenzofuran-5-carboxamide) and A-(4,6-diamino-l,3,5-triazin-2-yl) anthracene-9-carboxam-ide in presence of a small amount of o-cresol as a solvent under microwave condition. 

Similarly, mixtures of imide oligomers containing BCB groups and those containing maleimide groups were shown to polymerize at moderate temperatures of 200-250 °C to give thermally stable polymers [95]. 

The afore suggests that the limiting thermally stable moiety is the cyclopentadiene moieties and that construction of thermally stable titanium-containing polymers should avoid the Cp-Ti moiety. 

To clarify the mechanisms of plastic flow of linear-chain polymers we also consider polyimides (PIMs), which make up a large family of stiff and thermally stable polymers of outstanding performance (Bessonov et al. 1987). Polyimides contain cyclic imide groups as shown in Fig. 2.4 in the main chain. From this very... 

Polybenzimidazoles are a class of thermally stable polymers, typically condensed from aromatic bis-o-diamines and dicarboxylates. The namesake polymer repeat unit, which contains a 1,3-dinitrogen heterocycle, is benzimidazole. As a monomer, benzimidazole, has a melting point of 170°C and a boiling point of >360°C. Benzimidazole s hydrocarbon analog, indene, has a melting point of -2°C and a boiling point of 183°C. With only a molecular weight difference of 2, the differences in thermal behavior between benzimidazole and indene foretells some of the unusual thermal characteristics to be found in benzimidazole polymers. 

In general, it was found that the thio-monomers were more soluble and reactive than the oxo. They also produced more thermally stable polymers. The cis isomers of the monomers were more soluble than the trans, but the trans were more reactive. The polymers were stable in hot dilute hydrochloric acid and sodium hydroxide solutions. All polymers were soluble in chloroform, dimethylformamide, and sulfuric acid. Polymers which contained sulfur were also soluble in carbon tetrachloride, benzene, xylene and toluene. Brittle films could be cast from solution or melt-pressed. 

High-Performance Polymers Aromatic Heterocyclic Monomers Thermally Stable Polymers High-Performance Composites Reactive Oligomers Aromatic Polyformals Star and Comb Shape Copolymers Polymers in Phase Transfer Catalysis Organometallic Polymers Poljmiers in Medical Applications Nitrogen-Containing Polymers Vinyl Organometallic Monomers Functionalized Polymers Anionic Copolymerizations Macromers... 

Introduction of additives is a well-known method for the mechanism of the chemical reaction investigation. The experience has shown effectiveness of triple stabilizing formulations (Cu-containing compound + phenolic antioxidant + phosphite) for aryl-aliphatic polyamides, polyphthtalamides and other thermally stable polymers. The conception of such formulation is based on the mechanisms of the stabilizing action of the components ... 

Some unique properties of carboranes and weakly coordinating carborane anions have been exploited for the synthesis of a variety of polymeric materials. Carborane-containing polymeric materials are thermally very stable. In this section we will discuss the use of carborane clusters for the synthesis of thermally stable polymers, light-anitting luminescent polymers, conducting organic polymers (COPs), and coordination polymers. 

A large variety of bisimides and polymers containing maleimide and citraconimide end groups have also been reported (21—26). Thus polymers based on bisimidobenzoxazoles from the reaction of maleic anhydride and citraconic anhydride with 5-aniino-2-(p-aniinophenyl)benzoxazole and 5-aniino-2(y -aniinophenyl)benzoxazole are found to be thermally stable up to 500°C in nitrogen. 

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