Ether ea cellulose e bapala karolo efe seretseng se tsoakiloeng se ommeng?

Cellulose ether ke polymer ea maiketsetso e entsoeng ka selulose ea tlhaho ka phetoho ea lik'hemik'hale. Cellulose ether e tsoa ho cellulose ea tlhaho. Tlhahiso ea cellulose ether e fapane le li-polymers tsa maiketsetso. Thepa ea eona ea mantlha ke cellulose, motsoako oa tlhaho oa polymer. Ka lebaka la ho khetheha ha sebopeho sa cellulose ea tlhaho, selulose ka boeona ha e na bokhoni ba ho itšoara ka li-etherification agents. Leha ho le joalo, ka mor'a ho phekoloa ha moemeli oa ho ruruha, maqhama a matla a hydrogen pakeng tsa liketane tsa molek'hule le liketane li senyeha, 'me ho lokolloa ka mafolofolo ha sehlopha sa hydroxyl ho fetoha selulose e sebetsang ea alkali. Fumana ether ea cellulose.

Thepa ea cellulose ethers e itšetlehile ka mofuta, palo le kabo ea li-substituent. Ho hlophisoa ha cellulose ethers ho boetse ho ipapisitse le mofuta oa li-substituent, tekanyo ea etherification, solubility le thepa e amanang le kopo. Ho ea ka mofuta oa li-substituents ka ketane ea molek'hule, e ka aroloa ka monoether le ether e tsoakiloeng. Hangata re sebelisa mc joalo ka monoether, le HPmc joalo ka ether e tsoakiloeng. Methyl cellulose ether mc ke sehlahisoa ka mor'a hore sehlopha sa hydroxyl se karolong ea tsoekere ea cellulose ea tlhaho e nkeloe sebaka ke sehlopha sa methoxy. Ke sehlahisoa se fumanoang ka ho kenya karolo ea sehlopha sa hydroxyl sebakeng sa sehlopha ka sehlopha sa methoxy le karolo e 'ngoe ka sehlopha sa hydroxypropyl. Foromo ea sebopeho ke [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl methyl cellulose ether HEmc, ena ke mefuta e meholo e sebelisoang haholo le e rekisoang' marakeng.

Mabapi le solubility, e ka aroloa ka ionic le non-ionic. Li-ether tse qhibilihang ka metsing tseo e seng tsa ionic cellulose ethers haholo-holo li entsoe ka lihlopha tse peli tsa alkyl ethers le hydroxyalkyl ethers. Ionic Cmc e sebelisoa haholo ho li-detergents tsa maiketsetso, khatiso ea masela le ho daea, ho hlahloba lijo le oli. Non-ionic mc, HPmc, HEmc, joalo-joalo li sebelisoa haholo-holo ka thepa ea kaho, liaparo tsa latex, meriana, lik'hemik'hale tsa letsatsi le letsatsi, joalo-joalo E sebelisoa e le motenya, moemeli oa ho boloka metsi, stabilizer, dispersant le moemeli oa ho etsa filimi.


Nako ea poso: Nov-24-2022