Gulu la asayansi ochokera ku yunivesite ya Brown laphunzira za vuto lomwe lakhala lopanda yankho kwa nthawi yayitali. Chifukwa chake, nthawi ina, PBO yolimba kwambiri ya polima (polybenzoxazole) idapangidwa kuti ikhale zida zankhondo. Kutengera polybenzoxazole, siriyo zida zankhondo zinapangidwa kwa Asitikali aku US, koma patapita nthawi zidachotsedwa. Zinapezeka kuti zida zankhondo izi zitha kuwonongedwa mosayembekezereka chifukwa cha chinyezi. Izi sizilepheretsa kupanga ndi kugulitsa zida zankhondo kuchokera ku kusintha kosiyanasiyana kwa PBO pansi pa mtundu wa Zylon, koma kudalirika kwa zida kumasiyabe kufunikira.
Vuto ndi kudalirika kwa PBO ndikuti imagwiritsa ntchito corrosive polyphosphoric acid (PPA) kuphwanya maunyolo a polima panthawi yopanga zinthuzo. Asidi amagwira ntchito ngati zosungunulira komanso ngati chothandizira. Mamolekyu a asidi omwe amatsalira m'mamolekyu a polima amadzipangitsa kumva ngati zida zankhondo zikugwira ntchito mwa kuwonongeka kosayembekezereka kwa zinthuzo. Mukasintha PPA ndi chinthu chosavulaza, magwiridwe antchito a PBO ma polima amatha kusintha kwambiri, koma ndi chiyani?
Asayansi ochokera ku yunivesite ya Brown amagwiritsa ntchito PBO ngati chothandizira pomanga unyolo wa maselo aloyi wagolide (Au) ndi palladium (Pd) nanoparticles. Pakuyesa, chiΕ΅erengero choyenera cha chimodzi ndi china chinadziwika - 40% golide ndi 60% palladium - yomwe imathandizira kwambiri kupanga polima. Pankhaniyi, zosungunulira anali formic acid, ndi chilengedwe wochezeka ndi zongowonjezwdwa yaiwisi. Nthawi zambiri, njira yaukadaulo yatsopanoyi imakhala yochepa mphamvu komanso sikwera mtengo ngati kugwiritsa ntchito asidi wa polyphosphoric.
Pambuyo popanga mavoti okwanira a PBO polima pogwiritsa ntchito njira yatsopanoyi, adayesedwa powawiritsa m'madzi ndi asidi kwa masiku ambiri. Zinthuzi sizinawonongeke, zomwe zimapereka chiyembekezo cha kuwonjezeka kwakukulu kwa machitidwe a zovala zankhondo zogwiritsira ntchito. Nkhani yoperekedwa ku kafukufukuyu idasindikizidwa m'magazini .
Source: 3dnews.ru