Ethylcellulose inobva kune cellulose, yakasikwa polymer inoumbwa neglucose units. Inogadzirwa nekuita cellulose ne ethyl chloride kana ethylene oxide, ichigadzira chikamu chinotsiva cellulose mamorekuru. Ethylcellulose ine huwandu hwemakemikari zvivakwa zvinoita kuti zvive zvakakosha mumhando dzakasiyana dzeindasitiri nemishonga.
Molecular Structure:
Ethylcellulose inochengetedza chimiro chekutanga che cellulose, chinosanganisira kudzokorora zvikamu zveglucose zvakabatanidzwa pamwe chete ne β-1,4-glycosidic bonds.
Ethyl substitution inoitika kunyanya pamapoka ehydroxyl emusana we cellulose, zvichiita kuti madhigirii akasiyana-siyana ekutsiva (DS) aratidze huwandu hwehuwandu hwemapoka ethyl per glucose unit.
Iyo dhigirii yekutsiva inokanganisa zvimiro zve ethylcellulose, kusanganisira solubility, viscosity, uye kugona kugadzira firimu.
Solubility:
Nekuda kweiyo hydrophobic hunhu hweboka re ethyl, ethylcellulose haina kunyungudika mumvura.
Inoratidza kunyungudika mune zvakasiyana-siyana zveorganic solvents, kusanganisira doro, ketoni, esters, uye chlorinated hydrocarbons.
Solubility inowedzera nekuderera kwema molecular uremu uye kuwedzera dhigirii ethoxylation.
Mafirimu ekugadzira zvinhu:
Ethylcellulose inozivikanwa nekugona kwayo kugadzira firimu, ichiita kuti ive yakakosha mukugadzira machira, mabhaisikopo, uye inodzorwa-inoburitsa mishonga yekugadzira.
Iko kukwanisa kwe ethylcellulose kunyunguduka mumhando dzakasiyana-siyana dze organic solvents inosimudzira kuumbwa kwemafirimu, nekuzotevera evaporation ye solvent ichisiya firimu reyunifomu.
Reactivity:
Ethylcellulose inoratidza yakaderera reactivity pasi pemamiriro akajairwa. Nekudaro, inogona kugadziridzwa kemikari kuburikidza nekuita senge etherification, esterification, uye kuyambuka-kubatanidza.
Etherification reactions inosanganisira kuiswa kwezvimwe zvinotsiva pane cellulose musana, nekudaro kuchinja zvivakwa.
Esterification inogona kuitika nekuita ethylcellulose ne carboxylic acids kana acid chlorides, inogadzira cellulose esters ine yakagadziriswa solubility uye zvimwe zvinhu.
Cross-linking reactions inogona kutangwa kuvandudza simba remagetsi uye kugadzikana kwekupisa kwe ethyl cellulose membranes.
Thermal performance:
Ethylcellulose inoratidza kugadzikana kwekupisa mukati meimwe tembiricha yemhando, kupfuura iyo kuora kunoitika.
Kupisa kwekupisa kunowanzotanga kutenderedza 200-250 ° C, zvichienderana nezvinhu zvakaita sedhigirii rekutsiva uye kuvapo kweplasticizers kana additives.
Thermogravimetric analysis (TGA) uye differential scanning calorimetry (DSC) inowanzoshandiswa matekiniki kuratidza maitiro ekupisa ethylcellulose uye masanganiswa ayo.
kugarisana:
Ethylcellulose inoenderana neakasiyana mamwe mapolymers, plasticizers uye additives, zvichiita kuti ive yakakodzera kusanganisa nezvimwe zvinhu kuti zviwane zvinodiwa.
Zvimwe zvinowedzera zvinosanganisira mapurasitiki akadai se polyethylene glycol (PEG) uye triethyl citrate, iyo inowedzera kushanduka uye firimu-kugadzira zvinhu.
Kuenderana neanoshanda mishonga yemishonga (APIs) yakakosha mukugadzirwa kwemishonga yemishonga mafomu akadai seyakawedzerwa-kuburitswa mahwendefa uye transdermal patches.
Barrier performance:
Ethylcellulose mafirimu anoratidza yakanakisa chipingamupinyi zvivakwa kurwisa hunyoro, magasi uye organic mhute.
Izvi zvinodzivirira zvivakwa zvinoita kuti ethylcellulose ikwane kurongedza maapplication uko kuchengetedzwa kubva kune zvakatipoteredza kwakakosha kuchengetedza chigadzirwa kutendeseka uye pasherufu hupenyu.
Rheological properties:
Iyo viscosity ye ethylcellulose mhinduro inoenderana nezvinhu zvakaita se polymer concentration, dhigirii rekutsiva, uye solvent mhando.
Ethylcellulose mhinduro dzinowanzo ratidza pseudoplastic maitiro, zvichireva kuti viscosity yavo inodzikira nekuwedzera shear rate.
Rheological zvidzidzo zvakakosha kuti unzwisise kuyerera maitiro ethylcellulose mhinduro panguva yekugadziriswa uye yekuputira maapplication.
Ethylcellulose ipolymer inoshanda zvakasiyana-siyana ine huwandu hwemakemikari zvimiro izvo zvinobatsira mukubatsira kwayo mumhando dzakasiyana dzemaindasitiri nemishonga. Kunyungudika kwayo, firimu-kugadzira kugona, reactivity, kugadzikana kwekupisa, kuenderana, zvipingamupinyi zvivakwa uye rheology inoita kuti ive chinhu chakakosha chekupfeka, mafirimu, inodzorwa kuburitsa mafomu uye yekurongedza mhinduro. Kuwedzera kutsvagisa uye kusimudzira mumunda we cellulose derivatives inoenderera mberi nekuwedzera mashandisirwo uye kugona kwe ethylcellulose munzvimbo dzakasiyana siyana.
Nguva yekutumira: Feb-18-2024