Crosslinking aromatic polyamides (aramids)
The new cross-linked aramid polymers have shown improved properties, in particular, electrical insulation, thermal, stability, and/or mechanical properties while maintaining ease of processing. Further, the properties shown by the new cross-linked aramids of the invention render the product especially suitable for advanced technological applications. The crosslinking can be done without investment in nowadays aramid fiber industrial production facilities.
Crosslinking of aramid fibers by conventional production technologies (wet, dry, and dry-jet wet spinning). The crosslinking of armid fibers will render materials with even higher fire, mechanical and electrical-isolation performance.
The technology relates to a process for the preparation of a cross-linked aramid polymer comprising the step of heating a non-crosslinked polymer comprising the repeating unit of formula (I), figure 1 (see attached document), at a temperature comprised of from 150 to 400ºC for a period of time comprised of from 1 second to 20 minutes, wherein A and B are independently selected from meta-phenylene and para phenylene (see Figure 2 in the attached document), and R1 and R2 are independently selected from H and N3, with the proviso that at least one of R1 and R2 is N3, and R1 and R2 are attached to any of the positions 1, 2, 3, or 4 in para phenylene and 1, 2, 3 in meta-phenylene. The heating step of the non-crosslinked polymers comprising the repeating unit of formula (I) at a temperature from 150 to 400ºC yields the cross-linking of the polymeric materials and gives rise to improved mechanical and thermal properties, while maintaining ease of processing. In particular, the cross-linked polymers of the invention have shown advantageous Young?s Modulus and Tensile Strength, and lower dielectric constant, when compared with non crosslinked aramids.
The crosslinking of armid fibers will render materials with even higher fire, mechanical and electrical-isolation performance.
Aramid fiber proudction companies, such us DuPont, Teijin, Kolon industries, Hyosung, SRO Group, Yantai Sapndex co., Woongjin, Huvis, and Kermel.
PCT application pending. PCT/EP2013/062824
Jose Manuel López López
+34 947 25 8895