Hom Aramid Fibers
Aramid fibers feem ntau suav nrog tag nrho cov aromatic polyamide fibers thiab heterocyclic aromatic polyamide fibers, uas yuav muab faib ua peb hom: ortho-aramid fibers, para-aramid fibers (PPTA) thiab meta-aramid fibers (PMTA). Ntawm lawv, cov khoom lag luam feem ntau suav nrog meta-aramid thiab para-aramid. Qhov sib txawv tseem ceeb ntawm ob hom aramids yog qhov sib txawv ntawm kev sib txuas ntawm amide daim ntawv cog lus thiab C atom ntawm lub nplhaib benzene.
Para-aramid
Para-aramid, tseem hu ua poly (p-phenylene terephthalamide) (PPTA), tseem hu ua aramid 1414 hauv kuv lub tebchaws. Nws yog linear polymer uas ntau tshaj 85% ntawm amide bonds nyob rau hauv cov saw molecular yog ncaj qha sib txuas rau lub nplhaib aromatic. Nws yog lub ntiaj teb thawj fiber ntau ua los ntawm cov kua siv lead ua kua siv lead ua kua, tsim lub sijhawm tshiab ntawm cov khoom siv hluav taws xob zoo.
Meta-aramid
Meta-aramid, tseem hu ua poly (p-phenylene isophthalamide) (PMTA), tseem hu ua aramid 1313 hauv kuv lub tebchaws. Meta-aramid yog cov noob loj hlob sai tshaj plaws nyob rau hauv cov organic high-temperature resistant fibers. Cov fiber ntau molecules yog tsim los ntawm amide pawg thiab meta-phenyl pawg interconnected, thiab cov saw hlau molecular yog ncaj thiab serrated. Vim muaj zog hydrogen bonding ntawm molecules, fiber ntau muaj cov nplaim hluav taws zoo heev, thermal stability, hluav taws xob tiv thaiv thiab lwm yam khoom.
