IHydroxYethyl Cellulose (I-HEC) iyi-nonic, i-polymer esolule emanzini ethathwe ku-cellulose. Isetshenziswa kabanzi kwizimboni ezahlukahlukene, kufaka phakathi izinamathela, lapho isebenza khona njenge-ejenti yokuqina, i-rheology modifier, ne-stabilizer. Amandla ka-HEC okuthuthukisa ukubonakala kwezikhangiso kubalulekile kuzinhlelo eziningi, eqinisekisa uhlelo lokusebenza olufanele, ukusebenza, kanye nokuphila isikhathi eside komkhiqizo.
Izakhiwo ze-hydroxyethyl cellulose
I-HEC ikhiqizwa ngokuphendula i-cellulose nge-oxide ye-ethylene ngaphansi kwezimo ze-alkali, okuholela kwi-polymer namaqembu we-hydroxyethyls anamathiselwe kwi-cellulose backbone. Izinga lokufakwa esikhundleni (DS) kanye ne-molar actiation (MS) amapharamitha asemqoka athonya izakhiwo ze-HEC. I-DS isho inani eliphakathi lamaqembu e-hydroxyl ku-molecule ye-cellulose elifakwe esikhundleni samaqembu ama-hydroxyethyl, ngenkathi ama-MS akhombisa inani eliphakathi lama-mole we-ethylene oxide ephendule nge-anhydrogluce amayunithi e-cellulose.
I-HEC ibonakala nge-solubility yayo emanzini, yakha izixazululo ezicacile nezisobala ngokubonakala okuphezulu. I-viscosity yayo ithonywa yizici eziningana, kufaka phakathi isisindo samangqamuzana, ukugxila, izinga lokushisa, kanye ne-pH yesisombululo. Isisindo se-molecular so-HEC singasukela kusuka phezulu kuya phezulu, okuvumela ukwakheka kwezifiso ezinezidingo ezahlukahlukene zensizwa.
Izindlela zokuthuthuka kwe-viscosity
I-Hydration nokuvuvukala:
I-HEC ikhulisa i-adhesive viscosity ngokuyinhloko ngekhono layo lokunqwabelanisa nokudumba emanzini. Lapho i-HEC ingezwe ekwakhekeni okunamanzi okunamanzi, amaqembu we-hydroxyethyl aheha ama-molecule wamanzi, okuholela ekuvuvukeni kwamaketanga we-polymer. Lokhu kuvuvukala kwandisa ukumelana noxazululo kokugeleza, ngaleyo ndlela kwandise ukubonakala kwalo. Ubungako bokuvuvukala kanye nokubonakala okuphumela kuthonywa ukugxilwa kwe-polymer kanye nesisindo se-hec.
Ukufakwa kwamangqamuzana:
Kusixazululo, ama-polmers we-HEC abhekene nesakhiwo sawo eside kade. Lokhu kufakazelwa kudala inethiwekhi evimbela ukunyakaza kwama-molecule ngaphakathi kokunamathela, ngaleyo ndlela kwandise ukubonwa. I-HEC ephakeme ye-molecular Hec ibamba iqhaza ekuhlobiseni okubaluleke kakhulu nokuvunywa okuphezulu. Izinga lokubanjwa lingalawulwa ngokulungisa ukugxilwa kwe-polymer kanye nesisindo se-hec esisetshenzisiwe.
I-Hydrogen Bonding:
I-HEC ingakha ama-hydrogen bond ngama-molecule wamanzi nezinye izinto ekufakweni kokunamathela. Lezi zibopho ze-hydrogen zinomthelela ekubonakaleni ngokwakha inethiwekhi ehlelekile ngaphakathi kwesixazululo. Amaqembu e-Hydroxyethyl e-cellulose backbone athuthukisa amandla okwenza amabhondi e-hydrogen, akhuphuke ngokwengeziwe ngokubonakala.
Ukuziphatha okunciphisayo kwe-Shear:
I-HEC ikhombisa ukuziphatha okunciphisayo, okusho ukuthi i-viscosity yayo inciphisa ngaphansi kwengcindezi ye-shear. Le mpahla inenzuzo kwizicelo ezinamathela ngoba ivumela ukufaka isicelo esilula ngaphansi kwe-Shear (njengokusakazeka noma ukuxubha) ngenkathi igcina i-viscosity ephezulu lapho inokuphumula. Ukuziphatha okunciphisayo kwe-shear-ukuncipha kwe-hec kubhekwe ekulinganiseni kwamaketanga we-polymer ekuqondeni kwamandla asetshenzisiwe, kunciphisa ukumelana kwangaphakathi okwesikhashana.
Izicelo ekuhlolweni kokunamathela
Izikhangiso ezisuselwa emanzini:
I-HEC isetshenziswa kabanzi ekunamatheleni okususelwa emanzini, okufana nalawo amaphepha, izindwangu nokhuni. Amandla alo okuqina futhi aqinise ukwakhiwa okunamathelayo kuqinisekisa ukuthi ihlala ixubene futhi kulula ukuyisebenzisa. Emaphepheni nasezinamathegi, i-HEC inikeza ukubonakala okudingekayo kohlelo lokusebenza olufanele namandla.
Izikhangiso Zokwakha:
Ezinhlosweni zokwakha, ezinjengalezo ezisetshenziselwa ukufakwa kwe-tile noma ukumbozwa kodonga, i-hec ithuthukisa i-viscosity, ngcono ukukhiqizwa kokunamathela kanye nokuphikiswa kwe-sag. Isenzo esikhulayo se-HEC siqinisekisa ukuthi ukunamathela kuhlala endaweni ethile ngesikhathi sokufaka isicelo futhi kusetha kahle, ukuhlinzeka ngesibopho esiqinile nesihlala isikhathi eside.
Izilinganiso Zokunakekelwa Kwezimonyo kanye Nokwakhe:
I-HEC nayo isetshenziswa emikhiqizweni yokunakekelwa kwezimonyo kanye neyomuntu siqu edinga izakhiwo ezinamathela, njengakuma-gels wesitayela sezinwele namaski ebusweni. Kulezi zicelo, i-HEC inikeza ukuvumelana okubushelelezi nokufana, okwenza ngcono ukusebenza komkhiqizo kanye nesipiliyoni somsebenzisi.
Adhesives Ezemithi:
Embonini yezemithi, i-HEC isetshenziswa emaphethelweni eTransdermal kanye nezinye izinhlelo zokulethwa kwezidakamizwa lapho i-viscooty elawulwayo ibalulekile ekusebenzeni kokunamathela. I-HEC iqinisekisa ukuthi ungqimba lokunamathela umfaniswano, ukuhlinzeka ukulethwa kwezidakamizwa nokuthobela isikhumba okungaguquki esikhunjeni.
Izici ezithinta ukuthuthukiswa kwe-viscosity
Ukugxila:
Ukuhlushwa kwe-HEC ekwakhekeni okunamathelayo kulingana ngqo nokuvunywa. Ukugxila okuphezulu kwe-HEC kuholela ekuvulekeni okwengeziwe ngenxa yokusebenzisana okubaluleke kakhulu kwe-polymer chain kanye nokufakwa. Kodwa-ke, ukugxila okuphezulu ngokweqile kungaholela e-gelation kanye nobunzima ekusebenzeni.
Isisindo samangqamuzana:
Isisindo se-molecular se-HEC siyisici esibucayi ekunqumeni ukubonakala kokunamathela. Isisindo esiphakeme se-molecular Hec sinikeza ukubonakala okuphezulu ngokugxila okuphansi kuqhathaniswa nokuhlukahluka kwesisindo okuphansi kwamangqamuzana. Ukukhethwa kwesisindo se-molecular kuncike ekuboneni okufunwa kanye nezidingo zohlelo lokusebenza.
Lokushisa:
Lokushisa lithinta ukubonakala kwezixazululo ze-HEC. Njengoba izinga lokushisa likhuphuka, i-viscosity ngokujwayelekile incipha ngenxa yokwehliswa kwe-hydrogen bonding kanye nokuhamba kwe-molecular moleculat. Ukuqonda ubuhlobo bokushisa-ukubonakala kubalulekile ukuze izicelo zivezwe amazinga okushisa ahlukahlukene.
Ph:
I-PH yokwakheka okunamathelayo ingathonya ukubonakala kwe-HEC. I-HEC iqinile ngaphezulu kobubanzi be-PH, kepha izimo ze-PH ezibanzi zingaholela ezinguquko ekwakhekeni kwe-polymer nokubonakala. Izinhloso ezakhayo ngaphakathi kwebanga elifanelekile liqinisekisa ukusebenza okungaguquki.
Izinzuzo zokusebenzisa i-hydroxyethyl cellulose
Imvelo engeyona eye-ionic:
Imvelo engeyona eye-ionic ye-HEC yenza ukuthi ihambisane nezinhlobonhlobo zezingxenye ezahlukahlukene zokwakhiwa, kufaka phakathi amanye ama-polmer, ama-supfactants, nama-electrolyte. Lokhu kuhambisana kuvumela ukwakheka okunama-adhesive ahlukahlukene.
I-BiodegradeAbilibility:
I-HEC isuselwa ku-cellulose, insiza yemvelo nevuselelekayo. Kuyinto engathandeki, okwenza kube yikhethelo lezemvelo lokufaka izinamathela. Ukusetshenziswa kwayo kuqondaniswa ngesidingo esikhulayo semikhiqizo eqhubekayo neyama-eco-friendly.
Ukuqina:
I-HEC ihlinzeka ngosizo oluhle kakhulu ekunikezelweni kokunamathela, ukuvimbela ukuhlukaniswa kwesigaba kanye nokuxazulula kwezakhi eziqinile. Lokhu kuqina kuqinisekisa ukuthi ukunamathela kuhlala kusebenza ngempumelelo kulo lonke impilo yalo eshalofini nangesikhathi sesicelo.
Izakhiwo ezenziwe ngefilimu:
I-HEC yakha amafilimu aguqukayo futhi asobala lapho esomi, okuyinzuzo ngezinhlelo zokusebenza ezinamathela ezidinga umugqa webhondi ocacile futhi oguqukayo. Le mpahla iwusizo ikakhulukazi kwizicelo ezifana namalebula namateyipu.
IHydroxYethyl Cellulose idlala indima ebalulekile ekuthuthukiseni i-viscosives ngezindlela ezifana ne-hydration kanye nokuvuvukala, ukubopha amangqamuzana, kanye nokuziphatha okunciphisayo. Izakhiwo zayo, kufaka phakathi i-solubity, imvelo engeyona eye-ionic, i-biodegradability, kanye namakhono okwakha amafilimu, kwenze kube yikhetho elihle ezisetshenzisweni ezahlukahlukene zokunamathela. Ukuqonda izici ezithinta ukuthuthukiswa kwe-Viscosity ye-HEC, njengokuhlushwa, isisindo samangqamuzana, izinga lokushisa, kanye ne-ph, kuvumela abakhamishi ukuthi basebenzise imikhiqizo ethile yokusebenza. Njengoba izimboni ziyaqhubeka nokufuna izinto ezizinzile neziphezulu zokusebenza okuphezulu, i-HEC ihlala iyingxenye ebalulekile ekwakhekeni kwemikhiqizo evelayo enezinombolo.
Isikhathi sePosi: Meyi-29-2024