TPU ma muli o ka polyether

TPU ma muli o ka polyetherhe ʻanothermoplastic polyurethane elastomer. ʻO kāna hoʻolauna ʻōlelo Pelekane penei:

### Hoʻohui ʻia a hoʻohui ʻia ʻo TPU e pili ana i ka polyether mai ka 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), a me 1,4-butanediol (BDO). Ma waena o lākou, hāʻawi ʻo MDI i kahi ʻano paʻa, ʻo PTMEG ka ʻāpana palupalu e hāʻawi i ka mea me ka maʻalahi, a hana ʻo BDO ma ke ʻano he kaulahao e hoʻonui ai i ka lōʻihi o ke kaulahao mole. ʻO ke kaʻina hana synthesis ʻo MDI a me PTMEG ka mea mua e hana i kahi prepolymer, a laila e hana ka prepolymer i kahi hopena hoʻonui kaulahao me BDO, a ʻo ka hope, ua hoʻokumu ʻia ka TPU polyether ma lalo o ka hana a kahi catalyst.

### Nā ʻano hiʻohiʻona ʻO ke kaulahao molekala o TPU he (AB)n-type block linear structure, kahi ʻo A he ʻāpana palupalu polyether kiʻekiʻe-molecular-weight me ke kaumaha molekala o 1000-6000, ʻo B ka mea maʻamau butanediol, a ʻo ka hoʻolālā kemika ma waena o nā kaulahao AB he diisocyanate.

### Pōmaikaʻi Hana -

**Ke kūʻē Hydrolysis maikaʻi loa**: ʻOi aku ka ʻoi aku o ka paʻa kemika o ka polyether bond (-O-) ma mua o ka polyester bond (-COO-), a ʻaʻole maʻalahi ke haki a hoʻohaʻahaʻa ʻia i loko o ka wai a i ʻole ka wela a me ka wai. No ka laʻana, i ka hoʻāʻo lōʻihi ma 80 ° C a me 95% haʻahaʻa pili, ʻoi aku ka nui o ka paʻa ʻana o ka ikaika tensile, kahi polyether-based TPU, ʻoi aku ma mua o 85%, a ʻaʻohe hōʻemi maopopo i ka helu hoʻihoʻi elastic. – **Elasticity Haʻahaʻa Haʻahaʻa Maikaʻi**: ʻO ka mahana hoʻololi aniani (Tg) o ka māhele polyether he haʻahaʻa (maʻamau ma lalo o -50°C), ʻo ia hoʻiTPU hoʻokumu polyetherhiki ke hoʻomau i ka elasticity maikaʻi a me ka maʻalahi i kahi kaiapuni haʻahaʻa haʻahaʻa. Ma kahi ho'āʻo haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa -40 ° C, ʻaʻohe ʻano haʻihaʻi haʻihaʻi, a ʻo ka ʻokoʻa o ka hana kulou ʻana mai ke kūlana wela maʻamau ma lalo o 10%. – **Ke kūʻē i ka ʻino kemika maikaʻi a me ka pale ʻana i ka microbial**:TPU ma muli o ka polyetherHe hoʻomanawanui maikaʻi i ka hapa nui o nā mea hoʻoheheʻe polar (e like me ka waiʻona, ka ethylene glycol, ka waika nāwaliwali a me nā solution alkali), a ʻaʻole e pehu a hemo paha. Eia kekahi, ʻaʻole maʻalahi ka decomposed o ka ʻāpana polyether e nā microorganism (e like me ka mold a me ka bacteria), no laila hiki iā ia ke pale i ka hemahema o ka hana i hana ʻia e ka microbial erosion ke hoʻohana ʻia i loko o kahi lepo humid a i ʻole ka wai. – **Nā Waiwai Mechanical Kaulike**: Ma ke ʻano he laʻana, ʻo 85A kona paʻakikī Shore, aia i ka ʻāpana o nā elastomers paʻakikī waena. ʻAʻole wale ia e mālama i ka elasticity kiʻekiʻe a me ka maʻalahi o ka TPU, akā ua lawa ka ikaika o ke kūkulu ʻana, a hiki ke hoʻokō i kahi kaulike ma waena o ka "hoʻihoʻi elastic" a me ka "paʻa o ke ʻano". Hiki i kona ikaika tensile ke hiki i 28MPa, ʻo ka elongation i ka wā hoʻomaha ma mua o 500%, a ʻo ka ikaika o ka waimaka he 60kN / m.

### Nā Papa Hana Hoʻohana nui ʻia ka TPU e pili ana i ka polyether ma nā kula e like me ka lapaʻau ʻana, nā kaʻa, a me waho. I ka lāʻau lapaʻau, hiki ke hoʻohana ʻia e hana i nā catheters olakino ma muli o kona biocompatibility maikaʻi, hydrolysis resistance a me ka microbial resistance. Ma ke kahua kaʻa kaʻa, hiki ke hoʻohana ʻia no nā hoses o ka ʻenekini, nā sila puka, a me nā mea ʻē aʻe ma muli o kona hiki ke kū i ke kiʻekiʻe o ka wela a me ka haʻahaʻa haʻahaʻa, haʻahaʻa haʻahaʻa elasticity a me ka pale ozone. Ma ke kahua o waho, kūpono ia no ka hana ʻana i nā membrane wai waho, i nā wahi haʻahaʻa haʻahaʻa, etc.