Hydroxyl and allyl aromatic polyamide resin and its preparation method and application

Abstract

The invention discloses aromatic polyamide resin containing a hydroxyl group and an allyl group, a preparation method and an application thereof, wherein a repeated structure unit of the resin is represented as the formula I. In the aromatic polyamide resin, the hydroxyl group and the allyl group are introduced on a molecular chain of aromatic polyamide at the same time to form covalent bonds by reaction between a double bond of the allyl group and other materials. By means of introduction of a phenolic hydroxyl group, active forces between the molecular chains are enhanced by increasing the polarity of the aromatic polyamide, and meanwhile, by means of control of the contents of the two groups in the polymer, adjustment and control of a composite capability of aromatic polyamide fiber with other materials is achieved. The polymer represented as the formula I is good in thermal-stability. The hydroxyl group and the allyl group are easy to interact with epoxy resin, rubber and the like, thereby enhancing interlace adhesive performance. The aromatic polyamide resin may be employed as reinforced fibers of a sizing agent and can be used for developing an aromatic polyamide reinforced composite material being excellent in material interface composite performance.

Description

technical field [0001] The invention relates to a hydroxyl and allyl aromatic polyamide resin, a preparation method and application thereof. Background technique [0002] Aramid fiber is a kind of high-performance fiber, represented by polyparaphenylene terephthalamide (PPTA) fiber, which has many excellent properties, such as high strength, high modulus, high temperature resistance and solvent resistance, etc. , Widely used in aerospace, military, train cars, communication cables and reinforced composite materials, etc. [0003] However, aromatic polyamide fibers are composed of regular benzene rings and amide bonds, the molecular chains are rigid and closely arranged, the glass transition temperature is high, and there is high crystallinity, which leads to the lack of effective reactive functional groups on the fiber surface, not only poor dyeing ability, Moreover, the surface adhesion is weak, it is not easy to interact with other materials (such as nylon, epoxy resin an...

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Problems solved by technology

[0003] However, aromatic polyamide fibers are composed of regular benzene rings and amide bonds. The molecular chains are rigid and tightly arranged. They have a high glass transition temperature and high crystallinity, resulting in the lack of effective reactive functional groups on the surface of the fibers. Not only is the dyeing ability poor, Moreover, the surface adhesion is weak, it is not easy to interact with other materials (such as nylon, epoxy resin and rubber, etc.) in the process of preparing composite materials, and it is difficult to perfectly combine the performance of aramid fiber with the performance of other materials, which limits The scope of application of the fiber

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