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Yu J.,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials | Chen K.,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials | Li X.,CAS Shanghai Institute of Applied Physics | Tian F.,CAS Shanghai Institute of Applied Physics | And 3 more authors.
Journal of Applied Polymer Science | Year: 2016

The changes in performance during thermal-oxidative aging process of the aromatic co-polysulfonamide (co-PSA) fibers over a broad temperature range from 250°C to 320°C have been investigated. In addition, the mechanism of thermal-oxidative aging process has been studied by using structural information obtained from the fibers at varying length scales. The results showed that a significant reduction in tensile strength was observed compared with that of initial modulus during aging process. Macroscopically, thermal-oxidative aging mainly causes color changes of fibers and thermally induced macro defects begin to appear only at 320°C for 100 h. On a micro level, the crystal structure of fibers remained stable and did not show significant changes expect that aging at 320°C. In addition, thermo-degradation as well as crosslinking has been observed primarily in amorphous region. With the increase of temperature and time duration, the crosslinking became more dominant and crosslinking density increases. Correspondingly, the fibril length decreases due to degradation and then increases due to the formation of crosslinked structures within the fibers. The results suggest that molecular degradation is the main cause of strength loss and the formation of crosslinking structure within the fibers contributes to the retention of modulus and improvement of creep resistance. © 2016 Wiley Periodicals, Inc.

Yu J.,Donghua University | Tian F.,CAS Shanghai Institute of Applied Physics | Chen S.,Shanghai Tanlon Fiber Co. | Wang X.,Shanghai Tanlon Fiber Co. | And 2 more authors.
Journal of Applied Polymer Science | Year: 2015

The structure and performance changes of aromatic copolysulfonamide (co-PSA) fibers that occurred during wet spinning process have been studied. While using different length scale characterization, including scan electron microscopy (SEM), wide-angle X-ray scattering (WAXS), and small-angle X-ray scattering (SAXS), it was found that the molecular chains of co-PSA formed an isotropic network during coagulation which further lead to extension and orientation of these chains during the subsequent stretching. As a result, only after heat stretching and heat setting the molecular chains tended to pack into crystal lattice in the fibrils. This gave rise to a much denser structure along the spinning line and the glass transition temperature of co-PSA fibers increased a little after heat setting. Before heat stretching, the co-PSA fibers were in amorphous state, and only the amorphous orientation was observed within the fibers. After heat stretching at the temperature higher than Tg, the fraction of amorphous region decreased, and the crystal structure formed in the fibers, which became more perfect during heat setting. The structure development during spinning process contributed toward the improvement of thermo-mechanical stability, tenacity and modulus of the co-PSA fibers. © 2015 Wiley Periodicals, Inc.

Ding X.,Donghua University | Chen Y.,Donghua University | Chen S.,Shanghai Tanlon Fiber Co. | Li J.,Shanghai Tanlon Fiber Co. | And 3 more authors.
Journal of Macromolecular Science, Part B: Physics | Year: 2012

A series of aromatic polysulfonamides with various monomer ratios of 4,4-diaminodiphenylsulfone (p-DDS) and 3,3-diaminodiphenylsulfone (m-DDS) were synthesized to investigate the relationship between copolymer composition and their properties. The copolymer composition was determined from nuclear magnetic resonance (NMR). It was found that the copolymer composition of the polysulfonamides varied little from the monomer ratio; thus, similar reactivity of the two diaminodiphenylsulfones was shown by the results. From the analysis of the thermal properties of the polysulfonamides, high thermal stability of the copolymers was shown both in N 2 and air and the decomposition temperature exhibited little dependence on the copolymer composition. However, the glass transition temperatures (T g) decreased obviously with increasing m-DDS segments, which is helpful to improve the solubility and spinnability of these polysulfonamides. © 2012 Taylor & Francis Group, LLC.

Chen Y.,Donghua University | Wu D.,Donghua University | Li J.,Shanghai Tanlon Fiber Co. | Chen S.,Shanghai Tanlon Fiber Co. | And 3 more authors.
Macromolecular Symposia | Year: 2010

As one class of high temperature resistant aromatic polymers, polysulfonamides (PSA) are widely used in industry, physicochemical properties and conformation in solution have not been disclosed yet. In this work, the dilute solution behaviour of poly(m-diphenylsulphone terephthal amide) (m-PSA) was investigated by laser light scattering (LLS) and viscometry. The results showed that the m-PSA exists as single chains both in dimethylsulfoxide (DMSO) and dimethylformamide (DMF). The value of radius of gyration to hydrodynamic radius (s/Rh) indicats that the m-PSA has a random coil conformation in solution. Both the persistence length a and the characteristic ratio C ∞ indicate that the m-PSA chain is flexible in solution. The Mark-Houwink equation of m-PSA in DMSO was determined as [η] = 1.62 × 10-5M w0.87, and the exponent of 0.87 supports the assumption that m-PSA forms random coils in DMSO-solution at 25 °C. It was found that the flexibility of the PSA was affected when 4,4′-diphenylsulphone terephthalamide monomer was incorporated in backbone. The PSA random copolymer (r-PSA) with a comonomer ratio of 3:1 (4,4′-diaminodiphenyl- sulfone to 3,3′-diaminodiphenylsulfone) also had a random coil conformation in DMF; the rigidity increased, while the mobility of the chain was maintained. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chen Z.,Shanghai University of Engineering Science | Xin B.,Shanghai University of Engineering Science | Wu X.,Shanghai University of Engineering Science | Wang X.,Shanghai Tanlon Fiber Co. | Du W.,Shangtex Holding Group Corporation
Fibres and Textiles in Eastern Europe | Year: 2012

In this paper, polysulfonamide/carbon nanotube (PSA/CNT) composite solutions with different CNT contents were prepared using the physical blending method. Corresponding composite fibers were extruded and fabricated through a set of wet spinning units, and composite membranes were prepared by the spin-coating method. The PSA/CNT composite fibers and membranes were characterised by means of SEM, FTIR and XRD among others. The mechanical, thermal and electrical properties were also analysed in this study. The experimental results show that CNT at low contents can be distributed homogeneously in the PSA matrix. Furthermore the molecular structure and chemical composition of PSA does not undergo an obvious change. Crystallisation in the PSA can be promoted at low CNT contents because the nano-particles can act as a nucleation agent. Moreover the electrical conductivity of PSA can be improved significantly by the blending of CNT.

Xin B.J.,Shanghai University of Engineering Science | Chen Z.M.,Shanghai University of Engineering Science | Wu X.J.,Shanghai University of Engineering Science | Wang X.F.,Shanghai Tanlon Fiber Co. | Chen W.J.,Shanghai University of Engineering Science
Journal of the Textile Institute | Year: 2013

Polysulfonamide/nano titanium dioxide (PSA/nano-TiO2) composite spinning solutions with various nano-TiO2 mass fractions were prepared using the solution blending method. The corresponding composite fibers were developed by wet-spinning technology and the composite membranes were prepared using the digital spin-coating technique. The properties of PSA/nano-TiO2 composite fibers and membranes were investigated by scanning electron microscope, Fourier transform infrared spectroscopy and X-ray diffraction, etc. The effects of nano-TiO2 and its mass fractions on the mechanical properties, thermal stability and ultraviolet resistance of PSA composites were also analyzed. The experimental results showed that nano-TiO2 with low mass fractions can be dispersed evenly in the PSA matrix; the blending of nano-TiO2 had no obvious influence on the molecular structure and the chemical composition of PSA fiber; the crystallization in PSA fiber was promoted at low nanoparticles mass fractions because it can act as a nucleation agent; the mechanical properties and the thermal stability of PSA/nano-TiO2 composites can be enhanced obviously by blending nano-TiO2 into PSA matrix. The ultraviolet resistance of PSA composites can be improved significantly with the increasing nano-TiO2 mass fractions and the 7 wt.% specimen showed the lowest UV transmittance. © 2013 Copyright The Textile Institute.

Bin-Jie X.,Shanghai University of Engineering Science | Zhuo-Ming C.,Shanghai University of Engineering Science | Xiang-Ji W.,Shanghai University of Engineering Science | Xiao-Feng W.,Shanghai Tanlon Fiber Co.
Journal of Industrial Textiles | Year: 2013

Polysulfonamide polymers are defined by their heat-resistant ability subjected to a high temperature. The thermal behaviour of polysulfonamide polymers can be tailored by using the polymer as a matrix of multiphase composites. Multi-wall carbon nanotubes were blended with polysulfonamide polymers and the corresponding fibers were prepared by wet spinning. In the present paper, we have presented thermal behaviour of functionalized multi-wall carbon nanotube-reinforced polysulfonamide polymer by thermal gravimetric analysis and presented a heat conducting model to explain its thermal conductive behaviour. The experimental results showed that the thermal behaviour of developed multi-wall carbon nanotube-reinforced polysulfonamide composites were influenced by multi-wall carbon nanotube weight fraction in the polymer matrix. Multi-wall carbon nanotube in the polysulfonamide does have much influence on the thermal decomposition ratio of the polysulfonamide/multi-wall carbon nanotube composites. © The Author(s) 2012 Reprints and permissions:

Wang J.N.,Donghua University | Dong W.,Donghua University | Yu J.C.,Donghua University | Yang C.L.,Donghua University | And 2 more authors.
Materials Research Innovations | Year: 2015

Aromatic polysulphonamides fibre, as a high-performance polymer fibre, was prepared by dry-jet wet spinning. The morphology and properties of polysulphonamides fibre along spinning line during dry-jet wet spinning process were investigated. From the development of mechanical and thermal property, it is shown that the fibre showed an improved stress, modulus and density along spinning line and the remarkable improvement was observed only as the fibre was hot stretched above its glass transition temperature (Tg). The property development of the fibre on spinning line is coordinated with the morphology and structure. When the fibre was drawn at the temperature lower than Tg, only the amorphous orientation was observed whereas the crystalline structure was formed as the fibre drawing temperature higher than Tg. The further optimisation of dry-jet wet spinning technology of polysulphonamides fibre could be supported by our results. © W. S. Maney & Son Ltd 2015.

Yu Y.,Donghua University | Zhu X.,Donghua University | Wang R.,Donghua University | Chen S.,Shanghai Tanlon Fiber Co. | And 4 more authors.
Advanced Materials Research | Year: 2012

The solution behavior of aromatic polysulfonamide (PSA) in dimethylformamide (DMF) with the addition of CaCl 2 was studied by rheology and viscosity measurements. It is shown that no maximum in its intrinsic viscosity as a function of CaCl 2 concentration was observed and the relationship between η sp and PSA concentration c is consistent with the predicted scaling of θ solvent for both DMF and DMF/4% CaCl 2. However, the intrinsic viscosity, zero shear-rate viscosity and specific viscosity of PSA/DMF/4% CaCl 2 were found larger than that of PSA/DMF, which could be related to the extending of PSA chain in solution due to the increase of the interaction between the PSA macromolecules and solvent with addition of CaCl 2. © (2012) Trans Tech Publications, Switzerland.

Zhang Y.,Donghua University | Yu J.,Donghua University | Wang R.,Donghua University | Chen S.,Shanghai Tanlon Fiber Co. | And 2 more authors.
Fiber Society Spring 2013 Technical Conference | Year: 2013

The structure and properties change of pre-drawn aromatic copolysulfonamide fiber during heat-drawing process were studied to indicate the relationship between heat-drawn technology and structure, properties.

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