Hydroxyethyl cellulose (HEC) bụ polymer na-abụghị ionic, mmiri-soluble polymer nke sitere na cellulose. A na-eji ya eme ihe n'ọtụtụ ụlọ ọrụ dị iche iche, gụnyere adhesives, ebe ọ na-eje ozi dị ka ihe na-eme ka ọ dị arọ, ihe ngbanwe rheology, na stabilizer. Ikike HEC iji welie viscosity nke nrapado dị oke mkpa maka ọtụtụ ngwa, na-ahụ na ngwa kwesịrị ekwesị, arụmọrụ, na ogologo oge nke ngwaahịa nrapado.
Njirimara nke Hydroxyethyl Cellulose
A na-emepụta HEC site na ịmeghachi cellulose na ethylene oxide n'okpuru ọnọdụ alkaline, na-eme ka polymer nwere otu hydroxyethyl dị n'ime ọkpụkpụ azụ cellulose. Ogo nke nnọchi (DS) na ngbanwe molar (MS) bụ isi ihe na-emetụta njirimara nke HEC. DS na-ezo aka na nkezi ọnụọgụ hydroxyl dị na molekul cellulose nke ejirila hydroxyethyl dochie anya, ebe MS na-egosi nkezi ọnụ ọgụgụ mole nke ethylene oxide nke ejirila otu mole nke anhydroglucose nkeji mee ihe na cellulose.
A na-eji HEC mara ya site na solubility na mmiri, na-emepụta ngwọta doro anya na nke doro anya na nnukwu viscosity. A na-emetụta viscosity ya site n'ọtụtụ ihe, gụnyere ịdị arọ molekụla, ntinye uche, okpomọkụ, na pH nke ngwọta. Ibu arọ nke HEC nwere ike ịdị site na ala ruo nke ukwuu, na-enye ohere ịmepụta adhesives na ihe dị iche iche chọrọ viscosity.
Usoro nke nkwalite viscosity
Mmiri mmiri na ọzịza:
HEC na-eme ka viscosity nrapado na-eme ka ọ dịkwuo mma site n'ikike ya na-agbapụta mmiri na zaa na mmiri. Mgbe agbakwunyere HEC na usoro nrapado mmiri, otu hydroxyethyl na-adọta ụmụ irighiri mmiri, na-eduga na ọzịza nke ụdọ polymer. Ọzịza a na-eme ka ihe ngwọta na-eguzogide mmiri, si otú ahụ na-amụba viscosity ya. A na-emetụta oke ọzịza na viscosity nke na-esi na ya pụta site na mkpokọta polymer na ịdị arọ molekụla nke HEC.
Mgbakwunye molekụla:
Na ngwọta, HEC polymers na-enweta ihe mgbagwoju anya n'ihi usoro ogologo ogologo ha. Njikọ a na-emepụta netwọk nke na-egbochi mmegharị nke ụmụ irighiri ihe n'ime nrapado, si otú a na-amụba viscosity. Ịdị arọ molekụla dị elu HEC na-ebute njikọ dị ịrịba ama na viscosity dị elu. Enwere ike ịchịkwa ogo ntinye aka site n'ịgbanwe nhazi polymer na ịdị arọ nke HEC ejiri mee ihe.
Ngwakọta hydrogen:
HEC nwere ike ịmepụta njikọ hydrogen na ụmụ irighiri mmiri na ihe ndị ọzọ dị na nhazi nrapado. Njikọ hydrogen ndị a na-enye aka na viscosity site na ịmepụta netwọk a haziri ahazi n'ime ngwọta. Otu hydroxyethyl dị na ọkpụkpụ azụ cellulose na-eme ka ikike ịmepụta njikọ hydrogen, na-abawanye viscosity.
Àgwà na-akpachapụ anya:
HEC na-egosipụta omume na-akpachapụ anya, nke pụtara viscosity ya na-ebelata n'okpuru nrụgide siri ike. Ngwongwo a bara uru na ngwa nrapado n'ihi na ọ na-enye ohere maka ngwa ngwa dị mfe n'okpuru shear (dị ka ịgbasa ma ọ bụ brushing) ka ị na-ejigide viscosity dị elu mgbe ọ na-ezu ike, na-eme ka ọrụ ntanye dị mma na nkwụsi ike. A na-ekwu na omume HEC na-akpụ akpụ na-adabere na nhazi nke ụdọ polymer na ntụziaka nke ike etinyere, na-ebelata nguzogide n'ime nwa oge.
Ngwa dị n'ụdị nrapado
Ihe nrapado dabere na mmiri:
A na-eji HEC eme ihe nke ukwuu na nrapado mmiri, dị ka akwụkwọ, textiles, na osisi. Ikike ya ito eto na ime ka usoro nrapado kwụsie ike na-eme ka ọ dị mfe ịgwakọta ya ma dị mfe itinye. Na mpempe akwụkwọ na nkwakọ ngwaahịa, HEC na-enye viscosity dị mkpa maka ngwa kwesịrị ekwesị na ike njikọ.
Ihe nkwụnye ihe owuwu:
N'ime ihe ndị na-ewu ụlọ, dị ka ndị a na-eji maka ntinye tile ma ọ bụ ihe mkpuchi mgbidi, HEC na-eme ka viscosity dịkwuo mma, na-eme ka ọrụ nke nrapado na-arụ ọrụ na nkwụsị nke sag. Ihe nrịbama nke HEC na-eme ka nrapado na-anọ n'ebe n'oge ngwa ma na-edozi nke ọma, na-enye njikọ siri ike ma na-adịgide adịgide.
Ihe ịchọ mma na nlekọta onwe onye:
A na-ejikwa HEC na ngwaahịa ịchọ mma na nlekọta onwe onye nke chọrọ ihe nrapado, dị ka gels na-edozi ntutu na ihe mkpuchi ihu. N'ime ngwa ndị a, HEC na-enye ngbanwe dị nro na otu, na-eme ka arụmọrụ ngwaahịa na ahụmịhe onye ọrụ dịkwuo mma.
Ngwakọta ọgwụ:
N'ime ụlọ ọrụ na-emepụta ọgwụ, a na-eji HEC na patches transdermal na usoro nnyefe ọgwụ ndị ọzọ ebe viscosity na-achịkwa dị mkpa maka ịrụ ọrụ nrapado. HEC na-eme ka o doo anya na oyi akwa nrapado bụ otu, na-enye nnyefe ọgwụ na-agbanwe agbanwe na nkwụsi ike na akpụkpọ ahụ.
Ihe Na-emetụta Mmelite Viscosity
itinye uche:
Ntinye uche nke HEC na nhazi ihe nrapado dabara na viscosity. Ọnụ ọgụgụ dị elu nke HEC na-ebute mmụba viscosity n'ihi mkparịta ụka polymer dị ịrịba ama na njikọ. Otú ọ dị, oke elu dị elu nwere ike iduga gelation na ihe isi ike na nhazi.
Ibu Molecular:
Ibu arọ molekụla nke HEC bụ ihe dị mkpa na-achọpụta viscosity nke nrapado. Ibu arọ molekụla dị elu HEC na-enye viscosity dị elu na mkpokọta dị ala ma e jiri ya tụnyere ụdị ịdị arọ molekụla dị ala. Nhọrọ nke ịdị arọ molekụla dabere na viscosity chọrọ na ngwa chọrọ.
Okpomọkụ:
Okpomọkụ na-emetụta viscosity nke ngwọta HEC. Ka okpomọkụ na-abawanye, viscosity na-ebelatakarị n'ihi mbelata nke njikọ hydrogen yana mmụba nke molekụla. Ịghọta mmekọrịta okpomọkụ-viscosity dị mkpa maka ngwa ekpughere na ọnọdụ okpomọkụ dị iche iche.
pH:
pH nke ihe nrapado nwere ike imetụta viscosity nke HEC. HEC kwụsiri ike karịa oke pH, mana ọnọdụ pH dị oke egwu nwere ike ibute mgbanwe n'ụdị polymer na viscosity. Ịmepụta adhesives n'ime oke pH kacha mma na-eme ka arụmọrụ na-agbanwe agbanwe.
Uru nke Iji Hydroxyethyl Cellulose
Ọdịdị na-abụghị Ionic:
Ọdịdị na-abụghị ionic nke HEC na-eme ka ọ dakọtara na ọtụtụ ihe ndị ọzọ na-emepụta ihe, gụnyere ndị ọzọ polymers, surfactants, na electrolytes. Ndakọrịta a na-enye ohere maka nhazi nrapado dị iche iche.
Ọdịdị biodegradable:
HEC sitere na cellulose, ihe sitere n'okike na nke enwere ike imeghari. Ọ bụ ihe na-emebi emebi, na-eme ka ọ bụrụ nhọrọ enyi na gburugburu ebe obibi maka nhazi nrapado. Ojiji ya kwekọrọ n'ọchịchọ na-eto eto maka ngwaahịa na-adịgide adịgide na gburugburu ebe obibi.
Nkwụsi ike:
HEC na-enye nkwụsi ike dị mma na usoro nrapado, na-egbochi nkewa nke oge na nhazi nke ihe siri ike. Nkwụsi ike a na-eme ka nrapado na-anọgide na-arụ ọrụ n'oge ndụ ya na n'oge ngwa.
Njirimara ndị na-emepụta ihe nkiri:
HEC na-emepụta ihe nkiri na-agbanwe agbanwe na nke doro anya mgbe ihicha, nke bara uru maka ngwa nrapado chọrọ eriri njikọ doro anya ma na-agbanwe agbanwe. Ihe onwunwe a bara uru karịsịa na ngwa dị ka akara na teepu.
Hydroxyethyl cellulose na-arụ ọrụ dị mkpa n'ịkwalite viscosity nke nrapado site na usoro dị ka hydration na ọzịza, njikọ molecular, njikọ hydrogen, na omume na-akpachapụ anya. Njirimara ya, gụnyere solubility, ọdịdị na-abụghị ionic, biodegradability, na ike imepụta ihe nkiri, na-eme ka ọ bụrụ nhọrọ dị mma maka ngwa nrapado dị iche iche. Ịghọta ihe ndị na-emetụta nkwalite viscosity HEC, dị ka itinye uche, ịdị arọ molekụla, okpomọkụ, na pH, na-enye ndị na-emepụta ihe aka ịkwado ngwaahịa nrapado iji mezuo ihe a chọrọ. Ka ụlọ ọrụ na-aga n'ihu na-achọ ihe na-adịgide adịgide na nke dị elu, HEC na-anọgide na-abụ ihe bara uru na ịmepụta ngwaahịa nrapado dị elu.
Oge nzipu: Mee-29-2024