Polyacrylonitrile fibre modified with cations of copper, mercury and silver

Zgibneva, Zh. A.; Ubaidullaev, B. Kh.; Geller, A. A.; Geller, B. E.

doi:10.1007/bf00546994

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sorption of cations of silver, copper, and mercury by as-spun acrylic fibers 21 has also been reported. The introduction of metal cations produced appreciable changes in the mobility of the acrylonitrile copolymer as reflected from the thermomechanical curves.…”

Section: Introductionmentioning

confidence: 95%

Thermal and rheological behavior of acrylonitrile-carboxylic acid copolymers and their metal salt complexes

Bajaj¹,

Bahrami²,

Sen³

et al. 1999

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

ABSTRACT:The influence of acrylic, methacrylic, and itaconic acid comonomers in the nitrile oligomerization of acrylonitrile copolymers has been studied by DSC and DSC-FTIR in air and nitrogen atmospheres. Addition of metal salts in poly(acrylonitrileacrylic acid) copolymer, PA on thermal and rheological behavior has also been reported. Incorporation of CuSO 4 , FeSO 4 , ZnSO 4 , and Al 2 (SO 4 ) 3 (1 to 5 wt %) salt in the polymer solution affects its solubility in DMF. The complexes of PA with zinc sulphate, took a longer time to dissolve in DMF, whereas the complexes with Fe(SO 4 ) and Al 2 (SO 4 ) 3 are almost insoluble in DMF, perhaps due to intermolecular crosslinking. Addition of these metal salts to the PA solution also affects its Brookfield viscosity. The viscosity of 10 wt % polymer solution increases from 400 centipoise (Cps) to 1090 Cps for complex with 5% FeSO 4 (on the weight of dope solids) and 690 Cps for Al 2 (SO 4 ) 3 and 906 cps for ZnSO 4 complex. However, for CuSO 4 salt complex this value is 770 Cps. FTIR spectra shows the participation of COOH and CN group in the complex formation, which is responsible for enhanced Brookfield viscosity. Thermal behavior of the polymer-metal salt complex showed that these salts also affect the exothermic reaction. The initiation of cyclization reaction takes place at a lower temperature compared to neat acrylonitrile-acrylic acid copolymer. However, the heat liberated per unit time in N 2 atmosphere in case of neat polymer is 6.3 Jg Ϫ1 min Ϫ1 , which reduces to 5.5 Jg Ϫ1 min Ϫ1 in the case of the PA/Al complex, confirming the role of Al 2 (SO 4 ) 3 in retarding the rate of cyclization reaction.

show abstract

Section: Introductionmentioning

confidence: 95%