P84® Polyimide Fibers

General Properties

P84^® polyimide derived from aromatic dianhydrides and aromatic diisocyanates exhibits outstanding thermal stability. The polymer is non melting, has a glass transition temperature of 315 °C. The fibres start to carbonize at temperatures beyond 370 °C. Due to the aromatic structure the polymer and fibres are inherent non flammable. A limiting oxygen index of 38 percent can be measured. P84^® can be used to temperatures up to 260 °C depending on the environment.


Chemical Resistance

P84^® polyimide is stable against most common organic solvents like alcohols, ethers, halogenated hydrocarbons or ethers. Strong polar, aprotic solvents like dimethyl formamide (DMF), dimethyl acetamide (DMAC) , N-methyl pyrrolidon (NMP) or concentrated sulphuric acid dissolve P84^®.

P84^® is sensitive to strong oxidizers like nitrogen dioxide at elevated temperatures.
Strong concentrated aqueous acids such as sulphuric acid or concentrated aqueous Lewis Acids like zinc chloride affect P84^®.

Fibre Properties

Features of the P84^® polyimide fibres are the irregularly lobed cross-section being responsible for the high bulk of the fibres. The typical mechanical fibre data describe that P84^® is rather a textile fibre with good knot and loop strength properties. Because of the low modulus and the high elongation P84^® polyimide fibres are not destined for typical “reinforcing” applications as p-aramid or carbon fibres.