Iqela lezazinzulu ezivela kwiYunivesithi yaseBrown liye lafunda ingxaki ehlala ixesha elide ngaphandle kwesisombululo. Ke, ngaxesha lithile, i-polymer eyomelele ngokugqithisileyo i-PBO (i-polybenzoxazole) yacetywayo yesikrweqe somzimba. Ngokusekwe kwi-polybenzoxazole, izikrweqe zomzimba ezilandelelanayo zaveliswa kuMkhosi wase-US, kodwa emva kwexesha elithile zaye zarhoxiswa. Kwavela ukuba le nto yezixhobo zomzimba ixhomekeke kwintshabalalo engalindelekanga phantsi kwefuthe lokufuma. Oku akuthinteli ukuveliswa kunye nokuthengiswa kwezixhobo zomzimba kwiinguqu ezahlukeneyo ze-PBO phantsi kwe-brand ye-Zylon, kodwa ukuthembeka kwezixhobo kusashiya okuninzi.
Ingxaki ngokuthembeka kwe-PBO kukuba isebenzisa i-polyphosphoric acid eyingozi kakhulu (PPA) ukudiliza amatyathanga epolymer ngexesha lenkqubo yokwenziwa kwezinto. I-asidi isebenza zombini njenge-solvent kunye ne-catalyst. Iimolekyuli zeasidi ezishiyekileyo kwiimolekyuli zepolymer emva koko zizenza zizive ngexesha lokusebenza kwesikrweqe somzimba ngokutshatyalaliswa okungalindelekanga kwezinto. Ukuba utshintsha iPPA ngento engenabungozi, ukusebenza kweepolima zePBO kunokuphuculwa kakhulu, kodwa yintoni?
Izazinzulu ezivela kwiYunivesithi yaseBrown zisebenzisa i-PBO njengesixhobo sokwakha amatyathanga emolekyuli i-alloy yegolide (Au) kunye ne-palladium (Pd) nanoparticles. Ngexesha lovavanyo, umlinganiselo ofanelekileyo wesinye kunye nomnye wachongiwe - i-40% yegolide kunye ne-60% ye-palladium-eye yakhawulezisa ukuveliswa kwepolymer. Kule meko, i-solvent yayiyi-asidi ye-formic, i-iron-friendly friendly kunye nezixhobo ezihlaziywayo. Ngokubanzi, inkqubo entsha yetekhnoloji ayisebenzisi kakhulu amandla kwaye ayibizi njengokusebenzisa i-polyphosphoric acid.
Emva kokuvelisa imiqulu eyaneleyo ye-PBO polymer usebenzisa indlela entsha, yavavanywa ngokuyibilisa emanzini kunye ne-asidi iintsuku ezininzi. Izinto eziphathekayo azizange zenzeke ukuthotywa, okunika ithemba lokunyuka okukhulu ekusebenzeni kweempahla zezixhobo zomzimba zokuzisebenzisa. Inqaku elinikezelwe kolu phando lapapashwa kwijenali .
umthombo: 3dnews.ru