Polyurethane (PU), luv luv rau poly (URETHANE), yog cov tshuaj polymer ntau ntxiv los ntawm kev coj ua ntawm polycondensized los ntawm kev saib xyuas polycondensized los ntawm cov polyols thiab Diisocyanates. Nws yog lub npe hu rau nws cov kws kho zoo heev thiab yog siv dav hauv ntau cov ntawv thov thiab cov neeg siv khoom siv, suav nrog cov yeeb yaj kiab, cov nplaum, foams, thiab elastomers. Ntawm cov qauv sib txawv ntawm polyurethane, thermoplastic polyurethane (TPU) sawv tawm vim nws cov cim tshwj xeeb ntawm elasticity thiab txheej txheem.
TPU yog chav kawm ntawm linear segmented block copolymers, feem ntau sawv cev los ntawm cov mis (ab) ₙ. Nyob rau hauv tus qauv no, "ntu" yog qhov hnyav molecular phaus polyester los yog polyether (nrog molecular hnyav ntau npaum li cas ntawm 1000 saw yog ib tug luv luv} cov duab muaj 2 txog 12 carbon atoms. Cov khoom muag muag thiab nyuaj ntu txuas nrog los ntawm Diisocyanate chav nyob, tsim tus qauv uas muab ob qho tib si muab ob qho tib si thiab lub zog. Tsis zoo li cov roj hmab boslinked roj hmab, TPU muaj cov qauv txheej txheem ntawm cov qauv hluav taws xob feem tsawg nrog cov tshuaj ntsuab tsawg tsawg.
Ib qho ntawm TPU cov yam ntxwv tseem ceeb nyob rau hauv lub xub ntiag ntawm ntau cov hlua hydrogen ntawm nws cov molecular li cas yog hu ua lub cev crosslinking. Cov hydrogen bonds ua lub luag haujlwm tseem ceeb hauv kev txhawb nqa cov qauv tus qauv, ua rau nws cov modulus siab, lub zog tensile, thiab kev siv nyiaj ntau. Raws li qhov tshwm sim, TPU cov khoom ua pov thawj ua tsis tau zoo ua ntej, roj thiab tshuaj lom neeg kuj, thiab tseem ruaj khov hla qhov kub ntau. Nws tseem qhia tau zoo rau microbial nres thiab ib puag ncig kev laus.
Lwm qhov zoo dua ntawm TPU yog nws qhov kev coj cwj pwm thermoplastic. Lub cev crosslinking los ntawm hydrogen bonds yog thim rov qab - nyob rau hauv kev daws teeb meem tsis muaj zog, tso cai rau cov khoom kom ntws lossis rov kho dua. Thaum txias lossis cov kuab tshuaj evaporation, cov khoom siv hydrogen kho dua tshiab, ua kom cov khoom kom rov zoo li qub- lub xeev kev ua tau zoo yam tsis muaj kev poob zoo. Qhov no reprocessability ua rau TPU haum rau kev txhaj tshuaj molding, extrusion, thiab lwm yam thermoplastic txheej txheem txheej txheem.
Ib qho dej -}}}}}}}}}}}}}}}}}}}}}}}}}}}} Lub neej nyob rau hauv txhua hnub yog Spandex (tseem hu ua Elastane), yog hu ua Elastane fiber siv hauv textiles. Cov versatility, durability, thiab txheej txheem ntawm tpu ua nws cov khoom siv uas xaiv hauv kev lag luam thiab hluav taws xob rau cov khoom siv kho mob thiab kho mob.