Rheological Properties of all Para-Position Polysulfonamide Spinning Solutions

Abstract:

Our previous research showed that the presence of more rigid segments of p-phenylene in the PSA copolymer backbone enhanced the strength and modulus of the fiber. Poly (4,4'-diphenylsulfone terephthalamide) referred to as all para-position PSA, which was synthesised only by 4,4'-diaminodiphenylsulfone (4,4’-DDS) and terephthaloyl chloride (TPC), and it was expected to have best mechanical properties. As it cannot be easily dissolved in common amide-type polar aprotic solvents, N,N-dimethylacetamide (DMAc)/LiCl and DMAc/CaCl₂ solvent system was used to solve this problem. Static state rheological properties of all para-position PSA spinning solutions were investigated by measuring the apparent viscosity versus shear rate at different concentrations and temperatures. The effectiveness of cosolvent like LiCl and CaCl₂ in the solvent system were investigated, the results showed that LiCl was more effective than CaCl₂.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 1233-1236
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.1233
• Online since: June 2014
• Authors: Hu Min Li, Jiong Xin Zhao*
• Keywords: All Para-Position Polysulfonamide, Dmac/CaCl₂ Solvent System, Dmac/LiCl, Rheological Property

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