Uyini umehluko phakathi kwe-starch ether ne-cellulose ether?

Ama-ether esitashi nama-cellulose ethers womabili ama-ether adlala indima ebalulekile ezimbonini ezahlukahlukene, ikakhulukazi kwezokwakha nanjengezithasiselo emikhiqizweni ehlukahlukene.Nakuba zinokufana okuthile, ziyinhlanganisela ehlukene enezakhiwo zamakhemikhali ezihlukene, izakhiwo, kanye nezicelo.

1.Isakhiwo samakhemikhali:

Isitashi ether:
Ama-starch ethers asuselwa kusitashi, i-polysaccharide eyakhiwa amayunithi e-glucose.Isakhiwo samakhemikhali sesitashi siqukethe izingxenye ezimbili eziyinhloko: i-amylose (amaketanga aqondile ama-molecule eglucose axhunywe amabhondi e-α-1,4-glycosidic) kanye ne-amylopectin (ene-α-1,4 kanye ne-α-1,6- Ama-polymers egatsha ane-glycosidic bond. ) ukuxhumana.Ama-ether esitashi atholakala ngokushintsha amaqembu e-hydroxyl esitashi ngenqubo ye-etherification.

I-cellulose ether:
Ngakolunye uhlangothi, i-cellulose ingenye i-polysaccharide, kodwa ukwakheka kwayo kuqukethe amayunithi e-glucose axhunywe ngamabhondi e-β-1,4-glycosidic.Ama-cellulose ethers atholakala ku-cellulose ngenqubo ye-etherification efanayo.Amayunithi aphindaphindayo ku-cellulose axhunywe ngamabhondi e-beta, akha ukwakheka komugqa kanye nekristalu ephezulu.

2. Umthombo:

Isitashi ether:
Isitashi sivela kakhulu ezitshalweni ezinjengommbila, ukolweni namazambane.Lezi zitshalo zingamachibi esitashi kanti ama-starch ether angakhishwa futhi acutshungulwe.

I-cellulose ether:
I-Cellulose iyingxenye eyinhloko yezindonga zamaseli ezitshalo futhi ikhona kabanzi emvelweni.Imithombo evamile ye-cellulose ihlanganisa ukhuni, ukotini, nemicu yezitshalo ehlukahlukene.Ama-cellulose ether akhiqizwa ngokushintsha ama-molecule e-cellulose akhishwe kule mithombo.

3. Inqubo ye-Etherification:

Isitashi ether:
Inqubo ye-etherification yesitashi ihilela ukwethulwa kwamaqembu e-ether kumaqembu e-hydroxyl (OH) akhona kuma-molecule esitashi.Amaqembu e-ether avamile angeziwe ahlanganisa i-methyl, i-ethyl, i-hydroxyethyl, ne-hydroxypropyl, okuholela ekushintsheni kwezakhiwo zesitashi esishintshiwe.

I-cellulose ether:
I-Etherification ye-cellulose ihilela inqubo efanayo lapho amaqembu e-ether ethulwa emaqenjini e-hydroxyl e-cellulose.Okuphuma kokuphuma kwe-cellulose ether okujwayelekile kuhlanganisa i-methylcellulose, i-ethylcellulose, i-hydroxyethylcellulose ne-carboxymethylcellulose.

4. Ukunyibilika:

Isitashi ether:
Isitashi ether ngokuvamile sinokuncibilika kwamanzi okuphansi kune-cellulose ethers.Ngokuya ngeqembu elithile le-ether elinamathiselwe phakathi nokulungiswa, angase abonise amazinga ahlukene okuncibilika.

I-cellulose ether:
Ama-cellulose ether aziwa ngezinto zawo ezincibilika emanzini noma ezihlakazeka emanzini.Ukuncibilika kuncike ohlotsheni nezinga lokushintshwa kwe-ether.

5. Ukusebenza kokwenza ifilimu:

Isitashi ether:
Ama-ether esitashi ngokuvamile anamakhono alinganiselwe okwenza ifilimu ngenxa yemvelo yawo ye-semi-crystalline.Ifilimu ewumphumela ingase ingabonakali futhi iguquguquke kancane kunamafilimu enziwe ngama-cellulose ethers.

I-cellulose ether:
Ama-cellulose ether, ikakhulukazi okuphuma kokunye okufana ne-methylcellulose, aziwa ngezici zawo ezinhle kakhulu zokwenza ifilimu.Bangakwazi ukudala amafilimu acacile futhi aguquguqukayo, awenze abe yigugu ezinhlelweni ezifana nama-coatings nama-adhesives.

6.Izakhiwo ze-Rheological:

Isitashi ether:
Ama-ether esitashi angandisa i-viscosity yezixazululo ezinamanzi, kodwa ukuziphatha kwawo kwe-rheological kungase kuhluke kuma-cellulose ethers.Umthelela ku-viscosity uncike ezintweni ezifana nezinga lokushintshwa kanye nesisindo samangqamuzana.

I-cellulose ether:
Ama-cellulose ether aqashelwa kabanzi ngamakhono awo okulawula i-rheology.Zingathinta kakhulu i-viscosity, ukugcinwa kwamanzi kanye nezakhiwo zokugeleza ezinhlobonhlobo zezinhlelo zokusebenza ezihlanganisa amapende, izinto zokunamathisela nezinto zokwakha.

7. Isicelo:

Isitashi ether:
Ama-ether esitashi angasetshenziswa ezimbonini zokudla, zendwangu kanye nezithaka imithi.Embonini yezokwakha, asetshenziswa odakeni, kumapulasi kanye nezinamatheliso ukuze kuthuthukiswe izakhiwo ezifana nokugcinwa kwamanzi nokusebenza kahle.

I-cellulose ether:
Ama-cellulose ethers asetshenziswa kakhulu kwezemithi, ukudla, izimonyo kanye nezinkambu zokwakha.Zisetshenziswa kabanzi njengama-thickeners, ama-stabilizers nama-rheology modifiers kumapende, ama-mortars, ama-adhesives amathayili kanye nokwakhiwa okuhlukahlukene.

8. I-Biodegradability:

Isitashi ether:
Ama-ether esitashi atholakala ezitshalweni futhi ngokuvamile ayabola.Zisiza ukukhulisa ukusimama kwemikhiqizo esetshenzisiwe.

I-cellulose ether:
Ama-cellulose ethers atholakala ku-cellulose yezitshalo nawo angabola.Ukuhambisana kwazo kwezemvelo kuyinzuzo eyinhloko ezinhlelweni zokusebenza lapho ukusimama kubaluleke kakhulu.

Ekuphetheni:
Nakuba i-starch ethers kanye ne-cellulose ethers babelana ngokunye okufanayo njengokuphuma kwe-polysaccharide, izakhiwo zabo zamakhemikhali eziyingqayizivele, imithombo, ukuncibilika, izakhiwo zefilimu, ukuziphatha kwe-rheological kanye nezinhlelo zokusebenza zikubeka eceleni ukuze zisetshenziswe emikhakheni ehlukahlukene.Ama-ether esitashi atholakala ku-starch nama-cellulose ethers atholakala ku-cellulose ngalinye linezinzuzo eziyingqayizivele ezimeni ezahlukene.Ukuqonda lo mehluko kubalulekile ekukhetheni i-ether elungile yohlelo oluthile, ukuqinisekisa ukusebenza okuphelele nezici ezifiswayo.