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Abstract

In this study, a series of ultrahigh molecular weight polyacrylonitrile (UHMWPAN)/dimethylsulfoxide dilute solutions were produced and they were used afterwards as reaction medium for the synthesis of copolymers of acrylonitrile with itaconic acid by solution polymerization. The influence of UHMWPAN was investigated on the copolymerization and on the rheological behavior of the copolymer solutions. It was found that the presence of UHMWPAN was greatly influential on the copolymerization and the rheological behavior of the solutions. Compared with the polyacrylonitrile solution without UHMWPAN, M_η and η increased significantly. The results of shear rheological measurements indicated that the existence of UHMWPAN increased the characteristic relaxation time of polyacrylonitrile solutions. What is more, the polyacrylonitrile solutions containing UHMWPAN exhibited much more evident strain-hardening behavior than the solution without UHMWPAN. It was thus determined that polyacrylonitrile solutions containing a small amount of UHMWPAN are suitable for dry-jet wet spinning and can provide enhanced properties in the preparation of high-performance polyacrylonitrile precursor fiber.

Keywords

ultrahigh molecular weight polyacrylonitrile copolymerization polyacrylonitrile solution rheological behavior

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References

Yin

Chen

. Morphology and mechanical properties of polyacrylonitrile/attapulgite nanocomposite. J Mater Sci 2010; 45: 2372–2380.

Qin

. Improving preferred orientation and mechanical properties of PAN-based carbon fibers by pretreating precursor fibers in nitrogen. Carbon 2011; 49: 4598–4600.

Liu

Chae

Kumar

. Gel‐spun carbon nanotubes/polyacrylonitrile composite fibers. Part I: Effect of carbon nanotubes on stabilization. Carbon 2011; 49: 4466–4476.

Gao

. Densification mechanism of polyacrylonitrile-based carbon fiber during heat treatment. J Phys Chem Solids 2011; 72: 1159–1164.

Pan

. Preparation of semiconducting carbon fibre by pyrolysis of polyacrylonitrile precursor. J Mater Sci 1992; 27: 3497–3501.

Rahaman

Ismail

Mustafa

. A review of heat treatment on polyacrylonitrile fiber. Polym Degrad Stabil 2007; 92: 1421–1432.

Cato

Edie

. Flow behavior of mesophase pitch. Carbon 2003; 41: 1411–1417.

Serkov

. Improving carbon fibre production technology. Fibre Chem 2003; 35: 117–121.

M-y

H-y

Chen

. Study on the chemical structure and skin-core structure of polyacrylonitrile-based fibers during stabilization. J Polym Res 2009; 16: 513–517.

10.

Sobhanipour

Cheraghi

Volinsky

. Thermoporometry study of coagulation bath temperature effect on polyacrylonitrile fibers morphology. Thermochim Acta 2011; 518: 101–106.

11.

Tan

Pan

Wan

. Shear and extensional rheology of polyacrylonitrile solution: effect of ultrahigh molecular weight polyacrylonitrile. Colloid Polym Sci 2012; 290: 289–295.

12.

Bercea

Morariu

Brunchi

C-E

. Rheological investigation of thermal-induced gelation of polyacrylonitrile solutions. Int J Thermophys 2009; 30: 1411–1422.

13.

Paul

. A study of spinnability in the wet-spinning of acrylic fibers. J Appl Polym Sci 1968; 12: 2273–2298.

14.

Tan

. Investigating the spinnability in the dry-jet wet spinning of PAN precursor fiber. J Appl Polym Sci 2008; 110: 1997–2000.

15.

Han

. A theoretical study on fiber spinnability. Rheol Acta 1970; 9: 355–365.

16.

Rahman

Ismail

Mustafa

. The effect of residence time on the physical characteristics of PAN-based fibers produced using a solvent-free coagulation process. Mat Sci Eng A Struct 2007; 448: 275–280.

17.

Zeng

. Investigation the jet stretch in PAN fiber dry-jet wet spinning for PAN-DMSO-H2O system. J Appl Polym Sci 2009; 114: 3621–3625.

18.

Qian

. The role of macromolecular entanglements in the gel spinning process and properties of high performance polyacrylonitrile fibers. Journal Polym Eng 1995; 15: 327–345.

19.

Kobashi T and Takao S. Method for the production of high strength polyacrylonitrile fiber. Patent 4659529, USA, 1987.

20.

Sen

Bahrami

Bajaj

. High-performance acrylic fibers. J Macromol Sci C 1996; 36: 1–76.

21.

Tan

Pan

. Gelation behavior of polyacrylonitrile solution in relation to aging process and gel concentration. Polymer 2008; 49: 5676–5682.

22.

Rehage

Hoffmann

. Rheological properties of viscoelastic surfactant systems. J Phys Chem 1988; 92: 4712–4719.

23.

Muthukumar

Winter

. Fractal dimension of a crosslinking polymer at the gel point. Macromolecules 1986; 19: 1284–1285.

24.

Zhang

Lippits

Rastogi

. Dispersion and rheological aspects of SWNTs in ultrahigh molecular weight polyethylene. Macromolecules 2006; 39: 658–666.

The influence of ultrahigh molecular weight polyacrylonitrile on the copolymerization of acrylonitrile with itaconic acid and on the rheological properties of the resulting polyacrylonitrile solutions

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