Effect of short⁃cut p⁃aramid fibers on mechanical properties of polyacrylonitrile resin

doi:10.19491/j.issn.1001-9278.2024.03.003

Abstract

Abstract:

The surface of short⁃cut p⁃aramid fibers was modified with chlorosulfonic acid to introduce —SO₂Cl groups. An optimal modification effect was achieved at a chlorosulfonic acid concentration of 40 mmol/L. The fibers were modified by using phenyltriethoxysilane as a coupling agent， and the coupling agent was successfully grafted onto the fiber surface. The polyacrylonitrile/p⁃aramid fiber composites were prepared through in⁃situ polymerization of modified p⁃aramid fiber with benzonitrile monomer. The effect of fiber content on the mechanical properties of the composites was investigated. The composite obtained optimal mechanical properties at a fiber content of 0.5 wt%， and its storage modulus， glass transition temperature， and bending modulus reached 4，137 MPa， 350 ℃， and 4，467 MPa， respectively.

Key words: chopped para?aramid fiber, sulfonated modification, phthalonitrile resin, mechanical property

CLC Number:

TQ327.9

ZHOU Ziyu, SANG Xiaoming, DI Xu, XIAO Xiaohong, HUANG Xiaoxiang, CHEN Xinggang. Effect of short⁃cut p⁃aramid fibers on mechanical properties of polyacrylonitrile resin[J]. China Plastics, 2024, 38(3): 13-17.

Figures/Tables 7

Fig.1. Post curing program diagram of the muffle furnace

Fig.2. SEM of para aramid short cut fibers treated with different concentrations of chlorosulfonic acid sulfonation

Fig.3. Infrared spectra of para aramid short cut fibers treated with different concentrations of chlorosulfonic acid reagent sulfonation

Fig.4. FTIR of modified para aramid short cut fibers

Fig.5. Energy storage modulus of polystyrene/aramid fiber composite material

Fig.6. tanδ⁃T curves of polyphenylene nitrile resin/aramid fiber composite materials

Fig.7. Relationship between the bending modulus， bending strength， and fiber content of the composite materials

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