I-Polytetrafluoroethylene (PTFE) yimathiriyeli eyenziwe ngempazamo eyaqalwa ekupheleni koo-1930 ngelixa usokhemisti wayezama ukuphuhlisa uhlobo olutsha lwefriji esekwe kwi-perfluorethylene.Kunokuba iphumelele i-chlorofluorocarbon, isazinzulu samangaliswa kukufumanisa ukuba i-perfluorethylene esetyenzisiweyo kwinkqubo yasabela ngomxholo wentsimbi wesikhongozeli sayo kunye ne-polymerized phantsi koxinzelelo.
Iinkcazelo Ngeempawu Zokuqina:Uxinzelelo lwe-tensile kunye noxinzelelo oluqhekezayo lusetyenziswa ngokubanzi kwiinjongo zokulawula umgangatho, kodwa zizinto ezinganelisiyo kwiinjongo zokuyila ngezizathu ezibini: okokuqala, kwaye okona kubaluleke kakhulu, i-PTFE akufanele isetyenziswe kwiintlobo ezingaphaya kwendawo yesivuno (indawo apho i-curve-deformation curve inenguqu ecacileyo ye-slope) kwaye okwesibini, indawo yokuphuka ixhomekeke kwi-specimen shape kwaye ngoko ayiloncedo ukuqikelela ukuziphatha ekusebenzeni.
I-tensile load-extension curves efunyenwe kunye ne-specimens ye-PTFE ixhomekeke kwi-crystallinity, ubunzima be-molecular, ubukhulu, imilo kunye mhlawumbi nesakhiwo samasuntswana okuqala kunye nobukhulu beempazamo eziseleyo emva kokwenziwa.Ngaphaya koko, zixhomekeke, njengesiqhelo kwi-thermoplastics, kubushushu bovavanyo kunye nesantya soxinzelelo.Ngenxa yezi ngxaki, idatha elapha ingabonisa kuphela indlela yokuziphatha ngokubanzi.Iintsingiselo jikelele zokuziphatha kuxinzelelo lwe-PTFE njengomsebenzi wobushushu.La ngamagophe aqhelekileyo apho kunokuvela khona uxinzelelo lwesivuno, nangona lungaphantsi ngokuchanekileyo kunokuba lunokwenzeka kwizinto ezininzi zeplastiki.
Ukusetyenziswa koMbane oPhezulu we-PTFE:Ngokubhekiselele kwizicelo zombane ophezulu kwaziwa ixesha elide ukuba ubukho bokungaphumeleli kokukhutshwa kwamanzi kwenzeka ngenxa yokhukuliseko, njengoko i-PTFE iyinto engalandeleliyo.I-Parr kunye ne-Scarisbrick baye bathelekisa ukuziphatha koluhlu olubanzi lwe-polymeric insulators ngovavanyo lwe-IEE lokulandela umkhondo usebenzisa i-electrolyte, kunye novavanyo lwe-ASTM-fog test (D21 32-62T).Baye bafumanisa ukuba i-PTFE yenye yeklasi yokhukuliseko olubonisa ubomi obude, oko kukuthi > iiyure ezili-1000 kuvavanyo lwenkungu yothuli.Ngaloo ndlela i-PTFE ineempawu zomphezulu eziluncedo zokuxhaphaza kwizicelo zangaphandle.
Ukugquma isambuku sokwenziwa komgangatho ophezulu kuya kufuneka ukuze kuveliswe izakhiwo ezinomgangatho ophantsi kakhulu we-porosity kunye nokuvalwa kwangaphakathi okufunwa zizicelo zombane ophezulu.Uvavanyo ngokusebenzisa izixhobo zokukhupha i-elektroniki zinokwenziwa ukuqinisekisa ukukhululeka kwizinto ezikhutshwayo ezinokuthi zenzeke kwi-voids.Kungenjalo kunokwenzeka ukunciphisa ukukhutshwa ngokufaka i-PTFE ngolwelo lwe-dielectric okanye ngerhasi yoxinzelelo oluphezulu ukuze ugcwalise, ubuncinci, naziphi na iivoids kwipolymer.Ngenxa yoko, amaxabiso amandla e-dielectric afunyenwe kwiimvavanyo ezenziwe kwi-oyile anokuba phezulu ngokulahlekisayo kwi-PTFE eyenziwe kakubi ngenxa yokufakwa kwayo nayiphi na i-voids ekhoyo ngeoyile.
Ixesha lokuposa: Nov-24-2019