TPU i hoʻokumu ʻia ma ka Polyether

TPU i hoʻokumu ʻia ma ka Polyetherhe ʻano oelastomer polyurethane thermoplasticPenei kona hoʻolauna ʻana ma ka ʻōlelo Pelekania:

### Hoʻohuihui a me ka Hana ʻana Ua hana nui ʻia ka TPU i hoʻokumu ʻia i ka Polyether mai 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), a me 1,4-butanediol (BDO). I waena o lākou, hāʻawi ʻo MDI i kahi ʻano paʻa, hana ʻo PTMEG i ka ʻāpana palupalu e hāʻawi i ka mea me ka maʻalahi, a hana ʻo BDO ma ke ʻano he mea hoʻolōʻihi kaulahao e hoʻonui i ka lōʻihi o ke kaulahao molekala. ʻO ke kaʻina hana hana ʻana, ʻo ia ka hana mua ʻana o MDI a me PTMEG e hana i kahi prepolymer, a laila hana ka prepolymer i kahi hopena hoʻolōʻihi kaulahao me BDO, a ʻo ka hope loa, hana ʻia ka TPU i hoʻokumu ʻia i ka polyether ma lalo o ka hana a kahi mea hoʻoulu.

### Nā ʻAno Kūkulu ʻO ke kaulahao molekala o TPU he ʻano laina poloka ʻano (AB)n, kahi ʻo A kahi ʻāpana palupalu polyether kaumaha molekala kiʻekiʻe me ke kaumaha molekala o 1000-6000, ʻo B ka butanediol maʻamau, a ʻo ke ʻano kemika ma waena o nā kaulahao AB he diisocyanate.

### Nā Pōmaikaʻi Hana -

**Kū'ē Hydrolysis Maika'i Loa**: ʻOi aku ka pa'a o ke kemika o ka pilina polyether (-O-) ma mua o ka pilina polyester (-COO-), a ʻaʻole maʻalahi ke uhaki a hoʻohaumia i loko o ka wai a i ʻole kahi wela a pulu. No ka laʻana, i kahi hoʻāʻo lōʻihi ma 80°C a me 95% ka ha'aha'a pili, ʻoi aku ka nui o ka paʻa ʻana o ka ikaika tensile, kahi TPU i hoʻokumu ʻia i ka polyether, ma mua o 85%, a ʻaʻohe emi maopopo o ka helu hoʻōla elastic. – **Elasticity Ha'aha'a Maika'i**: ʻOi aku ka ha'aha'a o ka mahana hoʻololi aniani (Tg) o ka ʻāpana polyether (ma lalo o -50°C), ʻo ia hoʻiTPU i hoʻokumu ʻia i ka polyetherhiki nō ke mālama i ka elasticity maikaʻi a me ka maʻalahi i kahi kaiapuni haʻahaʻa. I loko o kahi hoʻāʻo hopena haʻahaʻa -40°C, ʻaʻohe hanana haki brittle, a ʻo ka ʻokoʻa o ka hana kūlou mai ke kūlana mahana maʻamau he emi ma mua o 10%. – **Ke kū'ē maikaʻi ʻana i ka palaho kemika a me ke kū'ē microbial**:TPU i hoʻokumu ʻia ma ka PolyetherHe hoʻomanawanui maikaʻi kona i ka hapa nui o nā mea hoʻoheheʻe polar (e like me ka waiʻona, ethylene glycol, nā waikawa nāwaliwali a me nā hopena alkali), a ʻaʻole e pehu a hoʻoheheʻe paha. Eia kekahi, ʻaʻole maʻalahi ka hoʻoheheʻe ʻia o ka ʻāpana polyether e nā microorganism (e like me ka mold a me ka bacteria), no laila hiki iā ia ke pale aku i ka hāʻule ʻana o ka hana i hoʻokumu ʻia e ka erosion microbial ke hoʻohana ʻia i loko o kahi lepo pulu a i ʻole kahi wai. – **Nā Waiwai Mechanical Kaulike**: Ma ke ʻano he laʻana, ʻo kona paʻakikī Shore he 85A, nona ka māhele o nā elastomers paʻakikī waena-kiʻekiʻe. ʻAʻole ia e mālama wale i ka elasticity kiʻekiʻe maʻamau a me ka maʻalahi o TPU, akā he ikaika kūkulu kūpono hoʻi, a hiki ke hoʻokō i kahi kaulike ma waena o ka "elastic recovery" a me ka "shape stability". Hiki i kona ikaika tensile ke hiki i 28MPa, ʻoi aku ka elongation ma ka haki ma mua o 500%, a ʻo ka ikaika haehae he 60kN/m.

### Nā Kahua Hoʻohana Hoʻohana nui ʻia ka TPU i hoʻokumu ʻia i ka Polyether ma nā kahua e like me ka mālama olakino, nā kaʻa, a me waho. Ma ke kahua lapaʻau, hiki ke hoʻohana ʻia e hana i nā catheters lapaʻau ma muli o kona biocompatibility maikaʻi, ke kū'ē ʻana i ka hydrolysis a me ke kū'ē ʻana i ka microbial. Ma ke kahua kaʻa, hiki ke hoʻohana ʻia no nā hose o ka ʻenekini, nā sila puka, a pēlā aku ma muli o kona hiki ke kū i nā wahi mahana kiʻekiʻe a me ka haʻahaʻa, ka elasticity haʻahaʻa a me ke kū'ē ʻana i ka ozone. Ma ke kahua waho, kūpono ia no ka hana ʻana i nā membrane wai ʻole o waho, ma nā wahi mahana haʻahaʻa, a pēlā aku.