TPU raws li Polyether

TPU raws li Polyetheryog ib homthermoplastic polyurethane elastomerNws cov lus qhia ua lus Askiv yog raws li nram no:

### Kev Sib Xyaws thiab Kev Sib Xyaws Polyether-based TPU feem ntau yog tsim los ntawm 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), thiab 1,4-butanediol (BDO). Ntawm lawv, MDI muab cov qauv khov kho, PTMEG tsim cov ntu mos mos los muab cov khoom siv nrog kev ywj pheej, thiab BDO ua haujlwm ua tus txuas ntxiv kom ntev dua ntawm cov saw hlau. Cov txheej txheem sib xyaw ua ke yog tias MDI thiab PTMEG ua ntej teb los tsim cov prepolymer, thiab tom qab ntawd cov prepolymer dhau los ua cov tshuaj tiv thaiv txuas ntxiv nrog BDO, thiab thaum kawg, polyether-based TPU yog tsim nyob rau hauv kev ua ntawm cov tshuaj catalyst.

### Cov Yam Ntxwv ntawm Cov Qauv Cov saw hlau molecular ntawm TPU muaj cov qauv linear (AB) n-type block, qhov twg A yog cov khoom siv polyether mos mos uas muaj qhov hnyav molecular ntawm 1000-6000, B feem ntau yog butanediol, thiab cov qauv tshuaj ntawm cov saw hlau AB yog diisocyanate.

### Cov txiaj ntsig ntawm kev ua tau zoo -

**Kev Tiv Thaiv Hydrolysis Zoo Kawg Nkaus**: Cov polyether bond (-O-) muaj kev ruaj khov tshuaj ntau dua li cov polyester bond (-COO-), thiab tsis yooj yim tawg thiab lwj hauv dej lossis qhov chaw kub thiab noo. Piv txwv li, hauv kev sim ntev ntawm 80 ° C thiab 95% qhov av noo, qhov ceev ntawm lub zog tensile, polyether-based TPU, tshaj 85%, thiab tsis muaj qhov txo qis ntawm qhov rov qab elastic. - **Kev Zoo Qis-Kub Elasticity**: Qhov kub hloov iav (Tg) ntawm polyether segment qis dua (feem ntau qis dua -50 ° C), uas txhais tau tiasTPU raws li polyethertseem tuaj yeem tswj tau qhov elasticity zoo thiab kev ywj pheej hauv qhov chaw kub qis. Hauv qhov kev sim cuam tshuam kub qis -40 ° C, tsis muaj qhov tshwm sim tawg brittle, thiab qhov sib txawv ntawm kev ua haujlwm khoov los ntawm qhov kub ib txwm yog tsawg dua 10%. - **Kev Tiv Thaiv Tshuaj Zoo thiab Kev Tiv Thaiv Microbial**:TPU raws li Polyethermuaj kev kam rau feem ntau cov kuab tshuaj polar (xws li cawv, ethylene glycol, cov kua qaub tsis muaj zog thiab cov kua alkali), thiab yuav tsis o lossis yaj. Tsis tas li ntawd, cov polyether ntu tsis yooj yim decomposed los ntawm cov kab mob me me (xws li pwm thiab cov kab mob), yog li nws tuaj yeem zam kev ua tsis tiav los ntawm kev yaig microbial thaum siv hauv cov av noo lossis dej ib puag ncig. - **Cov Khoom Siv Sib Npaug**: Piv txwv li, nws qhov Shore hardness yog 85A, uas yog pawg ntawm cov elastomers nruab nrab-siab hardness. Nws tsis tsuas yog khaws cov elasticity siab thiab yooj ywm ntawm TPU, tab sis kuj muaj lub zog txaus, thiab tuaj yeem ua tiav qhov sib npaug ntawm "elastic rov qab" thiab "kev ruaj khov ntawm cov duab". Nws lub zog tensile tuaj yeem ncav cuag 28MPa, qhov elongation ntawm tawg tshaj 500%, thiab lub zog rhuav yog 60kN / m.

### Cov Ntawv Thov Polyether-based TPU yog siv dav hauv cov teb xws li kev kho mob, tsheb, thiab sab nraum zoov. Hauv kev kho mob, nws tuaj yeem siv los ua cov catheters kho mob vim nws zoo biocompatibility, hydrolysis tsis kam thiab microbial tsis kam. Hauv kev kho tsheb, nws tuaj yeem siv rau cov hoses chav cav, lub qhov rooj foob, thiab lwm yam vim nws muaj peev xwm tiv taus qhov kub thiab txias siab, qhov kub qis elasticity thiab ozone tsis kam. Hauv kev ua teb sab nraum zoov, nws yog qhov tsim nyog rau kev ua cov ntaub thaiv dej sab nraum zoov, hauv qhov kub qis, thiab lwm yam.