I-Kevlar yintambo ye- synthetic, igama lenzululwazi elithi "i-aramid-polyparaphenylene-terephthalamide." Ngowe-1965 yaveliswa yinkampani yaseMerika DuPont. Ngenxa yamandla alo aphezulu (3620 MPa), iipropati zayo ezikhuselekileyo, isisindo esezantsi kunye nobuncwane, uKevlar ufumene isicelo esikhulu kwiindawo ezahlukeneyo. Eli nqaku liyakwazi ukumelana nokutshitshiswa kwexesha elide kunye neminye imithwalo, kungekhona yonke into ephosakeleyo.
Ukususela ngee-1970, ukhuselekileyo kwaye unokwethenjelwa uKevlar uye wabekwa kwimveliso yorhwebo phantsi kweemeko ezimbi. Nangona kunjalo, ekuqaleni kwakuye yenzelwe ukuqinisa amathaya eemoto, ukwenzela ukwandisa amandla abo nokunciphisa ubunzima. Ngoku baqhuba le ndlela yokuphumelela, kunye nokuqinisa iintambo ze-fiber-optic kunye nezobhedu zokuthintela ukuphula kunye nokulula, izambatho ezixubekileyo-ukunika ubungqina bokuthintela kunye nokuphazamiseka. Ngokukodwa, kulezi zindwangu zenziwe zikhuselekile kwiingubo zabadlali bezemidlalo kunye neenqwelo, iinqokethi kunye neiglavu zeKevlar. Imikhosi yamazwe amaninzi ehlabathi ithatha iKevlar ukuba ibe yintonga kwaye, ngokusebenzisa iipropati zayo, isetyenziswe ngokusetyenziswa kwizixhobo zempi kunye neenkonzo zokhuseleko. Umzekelo ocacileyo wokusetyenziswa okunjalo izibhengezo zobungqina-bullet.
Zonke iimveliso ezivela eKevlar zinokumelana nokushisa okukhulu kunye nokuchasana nama-acids kunye ne-alkalis. Isisombululo esipheleleyo sifakwe kwiiglavu kunye ne-Kevlar intambo: kwimveliso engozi kunye neyingozi, ehambelana namathuba okucutshulwa kwiglasi okanye ishidi, ukudibanisa rhoqo nezinto ezitshisa (ukuya kwi-100 ° C), kwishishini lokutya, ukwakha umatshini, ukuhanjiswa kweglasi kunye neminye imisebenzi. Ayikho indawo. Iiglavu zeKevlar zenzelwe ukukhusela izandla ukusuka kwizicucu ngethuba, umzekelo, ukutyunjwa kweentlanzi, iinkukhu, inyama, izithelo kunye nemifuno. Baya kukhanya kwaye bakhululekile - izandla zabo "ziphefumula", ziguquguquke ngokwaneleyo ukugcina uvelwano lwezandla kwaye zivumeleke ukuba zisebenze ngamacandelo amancinci, kwaye zibonelele ngokugqithiseleyo kakhulu (oyile) kwaye zomile. Iiglavu ezinjalo ziveliswa ngaphandle komnye umqolo kunye nobukhulu obuhlukeneyo, ukuze wonke umntu angathenga le mpendulo elula. Iiglavu zeKevlar zingasetyenziswanga nje njengeiglavu eziqhelekileyo, kodwa kwakhona njengezibini, kunye nobugcisa. Abafuni ukunyamekela okhethekileyo. Baya kuhlamba kwi-40 ° C ngamanqatha angathathi hlangothi , kwaye kufuneka makomiswe kwiqondo lokushisa. Unako, ukuba unqwenela, ubaguqule kwindawo yokucoca. Emva kokusetyenziswa nokuhlamba ngokuphindaphindiweyo, iiglavu (mittens) zeKevlar zigcina iimpawu zabo zokukhusela, ukuma nokubonakala kwazo, ngoko ke ubomi babo benkonzo bude ngokwaneleyo.
Kucaciswa kakuhle kwimisebenzi eyahlukeneyo uKevlar ufumana isicelo kwizemidlalo. I-skiers, i-car racers, i-motorcycle racer kunye ne-baseball basebenzisa iiglavu ze-kevlar. Ukunyaniseka kwabo, impembelelo yokuchasana nokunyanzeliswa kokushisa kunokunciphisa inani lokulimala okanye bawaphephe ngokupheleleyo.
Kodwa i-Kevlar kunye neenzuzo ezingenakuphikiswa zinemibalala. Kwiqondo lokushisa elincinci (430-480 ° C), liyakhula, kwaye kwisebusuku engaphezu kwama-150 ° C lilahlekelwa ngamandla alo. Isantya sokufudumala kunye nobude bayo, ngokuqinisekileyo, nendima indima. Ngoko-ke, iiyure ezingama-70 zokuchithwa kwiqondo lokushisa malunga nama-250 ° C, iiglavu zeKevlar ziya kulahlekelwa ngu-50% wamandla abo. Kwiqondo elisezantsi (ukuya ku--190 ° C), ngokuchaseneyo, amandla kunye nokunyaniseka kuyaqhubeka. Kodwa kwimpilo yemihla ngemihla akunakwenzeka ukudala imeko apho i-molecular molecular Kevlar iya kubhujiswa.