摘要:
Lyophilized polymer dot compositions are provided. Also disclosed are methods of making and using the lyophilized compositions and kits supplying the compositions.
摘要:
The invention describes a polymeric material comprising repeating units of Formulae I-III and methods of preparation. Novel polymeric materials, gas separation membranes and fluid component separation methods are also described.
摘要:
The present invention concerns a process for making a polyareneazole polymer, comprising the steps of : a) contacting azole-forming monomers, preferably 2, 3, 5, 6-tetraaminopyridine and 2,5-dihydroxyterephthalic acid metal powder, and optionally P2O5, in polyphosphoric acid to form a mixture; b) blending the mixture at a temperature of from 50°C to 110°C; c) further blending the mixture at a temperature of up to 145°C to form a solution comprising an oligomer; d) optionally, degassing the solution; and e) reacting the oligomer solution at a temperature of 160°C to 250°C for a time sufficient to form a polymer.
摘要:
The present invention provides aromatic diamine/aromatic dicarboxylate having the following formula (I)
NH 2 -Ar 1 -NH 2 • HOOC-Ar 2 -COOH (I)
wherein each symbol is as defined in the specification, which is in the form of particles having a median diameter of 5-100 µm and whiteness of not less than 75. This salt has high polymerizability and preferably has superior storage stability. Therefore, it can be preferably used for the production of polybenzazole that can be formed into a fiber and a film having high strength, high elastic modulus and high heat resistance.