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Polyimide/polyamide blend fiber

Author:admin   AddTime:2021-10-03

Although aramid fiber has high strength and modulus, the problem of poor UV resistance of aramid fiber has not been improved. Under the condition of outdoor natural light exposure for one year, its fiber tensile strength will decrease. 20%-40%, so that its application in special fields such as aerospace, atomic energy industry, especially in complex environments such as near-space fields with high ozone concentration and severe ultraviolet radiation, as well as outdoor cables, etc. are significantly restricted. . Although aromatic polyimide fibers have high heat resistance and excellent UV resistance, their tensile strength is generally not high enough.



Liu Xiangyang of Sichuan University and others reported a method for preparing aromatic polyamide/aromatic polyimide blend fiber by changing the composition of polyamide and polyamic acid and its ratio in the spinning solution, spinning method and spinning Silk technology to control the properties of the prepared polyamide and polyimide blend fiber, the specific spinning conditions. Due to the use of similar molecular structure design and the same solvent system, the compatibility of the blended polymer spinning dope is guaranteed, and it is more conducive to the aromatic polyamide and aromatic polyimide of the blended fiber prepared in the later stage. Compatible dispersion of molecular chains. The mechanical properties and UV resistance of the polyamide/polyimide blend fiber, its tensile strength is 4.5~5.0GPa, the tensile modulus is 142~160GPa, and the tensile strength retention rate is greater than 100h after UV lamp irradiation 95%, a high-strength, high-modulus and high-ultraviolet-resistant fiber with both the high mechanical strength of aromatic polyamide fiber and the high UV resistance of polyimide fiber was obtained.

ferrite sheet:https://www.goodsmaterial.com/

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