Aramid fibers are high-performance man-made fibers having molecules that have relatively stiff polymer chains. These molecules are linked by strong hydrogen bonds and can efficiently transmit mechanical stress, allowing for the usage of chains of low molecular weight. High strength, strong abrasion resistance, good resistance to organic solvents, non-conductive, low flammability, and so on are all features of aramid fibers.
Aramid fibers with functional surfaces can offer a variety of beneficial features in a variety of applications. For aramid fiber substrates, Alfa Chemistry offers a unique spectrum of functionalized surface coating services. You may change the surface properties of nearly any aramid fiber-related product with our wide and simple surface modification technology. Choose to collaborate with us to ensure that changing the surface of your product is simple!
Alfa Chemistry has a number of polymer surface coating technologies that may be used to functionalize the surface of aramid materials and give them different surface qualities. Our surface modification technology options include, but are not limited to, the following.
Chemically stable, optically transparent, and very durable, these nanoscale coatings can be created.
Case 1: Modified aramid fiber with polyamic acid
Current applications involving AF-reinforced composites are limited because of the poor interfacial adhesion between AFs and the matrix. The interfacial properties of aramid fibers (AFs) can affect their mechanical properties. Polyamide acid (PAA) molecules contain a large number of carboxyl, p-amine, and primary amine groups, which can react with the corresponding functional groups of AFs under certain conditions.
Fig 1. Schematic of grafting modification processing on aramid fibre surface (a); Scheme of the modification process (b). (Li Y, et al. 2019)
Alfa Chemistry grafted polyamide acids (PAA) onto the surface of aramid fibers (AF@PAA) to enhance the epoxy resin by improving the interfacial properties. AF@PAA contains many reactive groups that improve the roughness of the aramid fiber surface, thus improving the interfacial and mechanical properties of AF-reinforced E44 composites. FTIR and XPS showed that C-O and - COO-introduction, which confirmed the chemical reaction between the groups of aramid fibers and polyamide acids. This method provides a feasible approach for the interfacial modification of AF-reinforced epoxy composites and may be applicable to rubber composite systems.
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