Ethylcellulose bụ ihe sitere na cellulose, polymer eke sitere na nkeji glucose. A na-ejikọta ya site na iji ethyl chloride ma ọ bụ ethylene oxide meghachi omume cellulose, na-emepụta mkpụrụ ndụ cellulose na-anọchi anya nke ọma. Ethylcellulose nwere ụdị kemịkal dị iche iche na-eme ka ọ baa uru n'ọtụtụ ụlọ ọrụ mmepụta ihe na ngwa ọgwụ.
Ọdịdị Molecular:
Ethylcellulose na-ejigide ntọala ntọala nke cellulose, nke mejupụtara nkeji glucose ugboro ugboro jikọtara ya na njikọ β-1,4-glycosidic.
Ngbanwe ethyl na-apụta n'ụzọ bụ isi na otu hydroxyl nke ọkpụkpụ azụ cellulose, na-ebute ogo dị iche iche nke nnọchi (DS) na-egosi nkezi ọnụọgụ ethyl otu n'otu glucose.
Ogo nke nnọchi na-emetụta njirimara ethylcellulose, gụnyere solubility, viscosity, na ike imepụta ihe nkiri.
Solubility:
N'ihi ọdịdị hydrophobic nke otu ethyl, ethylcellulose enweghị ike ime na mmiri.
Ọ na-egosipụta solubility n'ụdị ihe mgbaze organic dị iche iche, gụnyere alcohols, ketones, esters, na chlorinated hydrocarbons.
Solubility na-abawanye site na mbelata arọ molekụla yana ogo ethoxylation na-abawanye.
Njirimara mmepụta ihe nkiri:
A maara Ethylcellulose maka ikike imepụta ihe nkiri ya, na-eme ka ọ baa uru na mmepụta nke mkpuchi, ihe nkiri, na usoro mmepụta ọgwụ na-achịkwa.
Ikike nke ethylcellulose igbari n'ọtụtụ ihe na-emepụta ihe na-emepụta ihe na-akwalite mmepụta ihe nkiri, na-ekpochapụ ihe mgbaze na-esote na-ahapụ otu ihe nkiri.
Mmeghachi omume:
Ethylcellulose na-egosipụta mmeghachi omume dị ntakịrị n'okpuru ọnọdụ nkịtị. Agbanyeghị, enwere ike gbanwee ya na kemịkalụ site na mmeghachi omume dị ka etherification, esterification, na njikọ njikọ.
Mmeghachi omume etherification gụnyere iwebata ihe mgbakwunye ndị ọzọ na ọkpụkpụ azụ cellulose, si otú ahụ gbanwee ihe onwunwe.
Esterification nwere ike ime site na-emeghachi omume ethylcellulose na carboxylic acid ma ọ bụ acid chlorides, na-emepụta cellulose esters na mgbanwe solubility na ihe ndị ọzọ.
Enwere ike ịmalite mmeghachi omume na-emekọrịta ihe iji melite ike igwe na nkwụsi ike okpomọkụ nke membranes ethyl cellulose.
arụmọrụ okpomọkụ:
Ethylcellulose na-egosiputa nkwụsi ike nke okpomọkụ n'ime oke okpomọkụ, karịa nke ire ere na-apụta.
Mbelata okpomọkụ na-amalitekarị ihe dịka 200-250 Celsius, dabere n'ihe ndị dị ka ogo nnọchi anya yana ọnụnọ plastik ma ọ bụ ihe mgbakwunye.
Thermogravimetric analysis (TGA) na differential scanning calorimetry (DSC) bụ usoro a na-ejikarị eme ihe iji mara omume okpomọkụ nke ethylcellulose na ngwakọta ya.
ndakọrịta:
Ethylcellulose dakọtara na ọtụtụ polymers ndị ọzọ, plasticizers na ihe mgbakwunye, na-eme ka ọ dị mma maka ịgwakọta ihe ndị ọzọ iji nweta ihe ndị a chọrọ.
Ihe mgbakwunye ndị a na-ejikarị gụnyere plasticizers dị ka polyethylene glycol (PEG) na triethyl citrate, nke na-eme ka mgbanwe na ihe na-emepụta ihe nkiri.
Ndakọrịta na ihe ndị na-emepụta ọgwụ na-arụ ọrụ (APIs) dị oke mkpa n'ịhazi ụdị usoro onunu ogwu dị ka mbadamba ihe ntọhapụ na transdermal patches.
arụmọrụ mgbochi:
Ihe nkiri ethylcellulose na-egosipụta ezigbo ihe mgbochi megide mmiri, gas na vapors organic.
Ihe mgbochi ndị a na-eme ka ethylcellulose dabara adaba maka ngwa nkwakọ ngwaahịa ebe nchekwa sitere na ihe gburugburu ebe obibi dị oke mkpa maka idowe iguzosi ike n'ezi ngwaahịa na ndụ nchekwa.
Njirimara rheological:
Viscosity nke ngwọta ethylcellulose na-adabere n'ihe ndị dị ka ntinye uche polymer, ogo nke nnọchi, na ụdị ihe mgbaze.
Ngwọta ethylcellulose na-egosipụtakarị omume pseudoplastic, nke pụtara na viscosity ha na-ebelata na ọnụ ọgụgụ shear na-abawanye.
Ọmụmụ ihe ọmụmụ rheological dị mkpa iji ghọta njirimara eruba nke ngwọta ethylcellulose n'oge nhazi na mkpuchi ngwa.
Ethylcellulose bụ polymer dị iche iche nwere ụdị kemịkalụ dị iche iche na-enye aka na uru ya na ngwa ụlọ ọrụ dị iche iche na ọgwụ. Ya solubility, ihe nkiri-akpụ ikike, reactivity, thermal nkwụsi ike, ndakọrịta, ihe mgbochi Njirimara na rheology na-eme ka ọ bụrụ ihe bara uru maka mkpuchi, ihe nkiri, usoro ntọhapụ na-achịkwa na ngwọta nkwakọ ngwaahịa. Nnyocha ndị ọzọ na mmepe na ngalaba nke mkpụrụ ndụ cellulose na-aga n'ihu na-amụba ngwa na ikike nke ethylcellulose na mpaghara dị iche iche.
Oge nzipu: Feb-18-2024