Sitaci ethers da cellulose ethers duka ethers ne waɗanda ke taka muhimmiyar rawa a cikin masana'antu daban-daban, musamman a cikin gini da ƙari a cikin samfuran daban-daban. Ko da yake suna da wasu kamanceceniya, suna da mahalli daban-daban tare da tsarin sinadarai daban-daban, kadarori, da aikace-aikace.
1.Tsarin sinadarai:
Starch ether:
An samo sitaci ethers daga sitaci, polysaccharide wanda ya ƙunshi raka'a na glucose. Tsarin sinadarai na sitaci ya ƙunshi manyan abubuwa guda biyu: amylose ( sarƙoƙi na linzamin ƙwayoyin glucose waɗanda ke da alaƙa da α-1,4-glycosidic bonds) da amylopectin (suna da α-1,4 da α-1,6- polymers masu rassa tare da haɗin glycosidic). ) lamba. Ana samun sitaci ethers ta hanyar gyara ƙungiyoyin hydroxyl na sitaci ta hanyar etherification.
Cellulose ether:
Cellulose, a gefe guda, wani polysaccharide ne, amma tsarinsa ya ƙunshi raka'o'in glucose masu alaƙa da haɗin β-1,4-glycosidic. Ana samun ethers na cellulose daga cellulose ta hanyar tsarin etherification irin wannan. Maimaita raka'a a cikin cellulose ana haɗe su ta hanyar haɗin beta, suna samar da tsarin layi mai tsayi da sifa.
2. Tushen:
Starch ether:
Sitaci ya fi fitowa daga tsirrai kamar masara, alkama da dankali. Waɗannan tsire-tsire sune tafkunan sitaci kuma ana iya fitar da ethers sitaci da sarrafa su.
Cellulose ether:
Cellulose shine babban bangaren ganuwar tantanin halitta kuma yana yaduwa a yanayi. Tushen cellulose na yau da kullun sun haɗa da ɓangaren litattafan almara, auduga, da filayen shuka iri-iri. Ana samar da ethers na cellulose ta hanyar gyara ƙwayoyin cellulose da aka samo daga waɗannan tushe.
3. Tsarin etherification:
Starch ether:
Tsarin etherification na sitaci ya ƙunshi gabatarwar ƙungiyoyin ether a cikin ƙungiyoyin hydroxyl (OH) waɗanda ke cikin ƙwayoyin sitaci. Ƙungiyoyin ether gama gari da aka ƙara sun haɗa da methyl, ethyl, hydroxyethyl, da hydroxypropyl, wanda ke haifar da canje-canje a cikin kaddarorin sitaci da aka gyara.
Cellulose ether:
Etherification na cellulose ya ƙunshi irin wannan tsari wanda aka shigar da ƙungiyoyin ether a cikin ƙungiyoyin hydroxyl na cellulose. Abubuwan da aka samo asali na ether cellulose na kowa sun haɗa da methylcellulose, ethylcellulose, hydroxyethylcellulose da carboxymethylcellulose.
4. Solubility:
Starch ether:
Ethers sitaci gabaɗaya suna da ƙarancin solubility na ruwa fiye da ethers cellulose. Dangane da ƙayyadaddun ƙungiyar ether da aka haɗe yayin gyare-gyare, za su iya nuna nau'i daban-daban na solubility.
Cellulose ether:
Cellulose ethers an san su don abubuwan da ke narkewa ko ruwa. Solubility ya dogara da nau'in da digiri na maye gurbin ether.
5. Yin Fim:
Starch ether:
Ethers na sitaci gabaɗaya suna da iyakance iyawar shirya fim saboda yanayin semi-crystalline. Fim ɗin da aka samu zai iya zama ƙasa da bayyane kuma ƙasa da sassauƙa fiye da fina-finan da aka yi daga ethers cellulose.
Cellulose ether:
Cellulose ethers, musamman wasu abubuwan da aka samo asali kamar methylcellulose, an san su da kyawawan abubuwan ƙirƙirar fim. Za su iya ƙirƙirar fina-finai masu tsabta da sassauƙa, suna sa su zama masu mahimmanci a aikace-aikace irin su sutura da adhesives.
6.Hanyoyin Rheological:
Starch ether:
Sitaci ethers na iya ƙara danko na ruwa mafita, amma su rheological hali iya bambanta da cellulose ethers. Tasiri akan danko ya dogara da dalilai kamar matakin maye gurbin da nauyin kwayoyin halitta.
Cellulose ether:
Cellulose ethers an san su sosai don ikon sarrafa rheology. Suna iya tasiri sosai ga danko, riƙewar ruwa da kaddarorin kwarara a cikin aikace-aikace iri-iri da suka haɗa da fenti, adhesives da kayan gini.
7. Aikace-aikace:
Starch ether:
Ana iya amfani da ethers na sitaci a cikin masana'antar abinci, masaku da masana'antar magunguna. A cikin masana'antar gine-gine, ana amfani da su a cikin turmi, filasta da adhesives don haɓaka kaddarorin kamar riƙe ruwa da aiki.
Cellulose ether:
Ana amfani da ethers na cellulose sosai a cikin magunguna, abinci, kayan kwalliya da filayen gini. Ana amfani da su ko'ina azaman thickeners, stabilizers da rheology modifiers a cikin fenti, turmi, tile adhesives da daban-daban formulations.
8. Halittar Halitta:
Starch ether:
Ethers sitaci an samo su ne daga tsire-tsire kuma gabaɗaya suna iya lalacewa. Suna taimakawa wajen haɓaka ɗorewa na samfuran da aka yi amfani da su.
Cellulose ether:
Cellulose ethers da aka samu daga shuke-shuke cellulose su ma biodegradable. Daidaituwar muhallinsu shine babban fa'ida a aikace-aikace inda dorewa shine fifiko.
a ƙarshe:
Kodayake sitaci ethers da cellulose ethers suna raba wasu abubuwan gama gari kamar abubuwan da aka samo asali na polysaccharide, sigar sinadarai na musamman, tushensu, solubility, abubuwan ƙirƙirar fim, halayen rheological da aikace-aikacen ke ware su don amfani da su a fannoni daban-daban. Sitaci ethers samu daga sitaci da cellulose ethers samu daga cellulose kowanne yana da musamman abũbuwan amfãni a cikin yanayi daban-daban. Fahimtar waɗannan bambance-bambance yana da mahimmanci don zaɓar madaidaicin ether don takamaiman aikace-aikacen, tabbatar da ingantaccen aiki da halayen da ake so.
Lokacin aikawa: Janairu-25-2024