Polyacrylonitrile-MV250000

Catalog	ACM25014419-7
CAS	25014-41-9
Structure
Molecular Weight	250000
Storage	Room temperature

Case Study

Gel-Spun Carbon Nanotube/Polyacrylonitrile Composite Fiber

Liu, Yaodong, et al. Carbon, 2011, 49(13), 4466-4476.

The addition of carbon nanotubes (CNTs) to polyacrylonitrile (PAN) fibers significantly improves the mechanical properties of the resulting carbon fibers. This work investigates the effect of different types of CNTs on the chemical, mechanical, and structural changes during the stabilization process of gel-spun CNT/PAN composite fibers. The addition of CNT reduces the generation of β-aminonitrile, improves the orientation of the ladder polymer, and increases the tensile modulus of the stabilized fiber. The reinforcement efficiency of CNTs containing more walls was found to be lower than that of CNTs containing fewer walls.
Preparation of PAN/CNT composite fibers
· Fiber spinning solutions were prepared using PAN polymer (Mv=250,000 g/mol) and different types of CNTs (with different residual catalyst contents and average wall numbers) and spun into fibers.
· The CNT content in all composite fibers was 1 wt.% based on the weight of the polymer. The fibers were spun through a single-hole spinneret with a diameter of 120 μm and an as-spinning draw ratio of 3. The as-spun fibers were placed in a methanol/dry ice bath for 2 days and subsequently stretched in a glycerol bath at 160 °C to a draw ratio of 4.5. Stabilization was performed in a box furnace with an air flow rate of 20 standard cubic feet per minute.

Preparation of Polyacrylonitrile-Based Carbon Fiber Paper by Centrifugal Spinning

Wu, Zhiyu, et al. Journal of Industrial Textiles, 2023, 53, 15280837221149214.

A centrifugal spinning method was developed to successfully prepare stable and homogeneous Polyacrylonitrile (PAN) carbon fiber paper. The prepared PAN carbon fiber paper has an electrical conductivity of 43.250 s·cm-1, a resistivity as low as 0.023~0.033 Ω·cm, and a contact angle of more than 140°.
Preparation procedure of PAN-based carbon fiber paper
· PAN powders with different average molecular weights (average molecular weight: 85000 and 250000) were dissolved in DMF and stirred for 1h to prepare PAN spinning solutions with different PAN/DMF ratios. Six polymer solutions were prepared for centrifugal spinning with different PAN/DMF weight ratios.
· The centrifugal spinning equipment was independently designed and developed, with a spinning speed of 4000 r/min and an output rate of 1.1-1.4 g/min, which is much higher than that of electrospinning. During the spinning process, the ambient temperature was always maintained at about 40 °C, and the ambient humidity was maintained at 30%-50%. The PAN fiber felt was first dried at 60 °C for 6 h, and then hot pressed at 10 MPa for 5 min to obtain PAN fiber paper (PFP).
Finally, polyacrylonitrile carbon fiber paper (PCFP) was prepared by pre-oxidation and carbonization. First, PFP was placed in a muffle furnace for pre-oxidation, heated to 280 °C at a heating rate of 5 °C·min-1, and annealed for 60 min. Subsequently, the pre-oxidized fiber paper was carbonized at different carbonization temperatures in a N 2 atmosphere. The carbonization temperature was reached at a heating rate of 5 °C·min-1 and maintained for 120 min.