Cellulose, uas muaj ntau tshaj plaws organic compound nyob rau hauv lub ntiaj teb, nthuav tawm cov khoom zoo kawg li, ib qho ntawm nws lub peev xwm nqus dej. Qhov no hygroscopic xwm ntawm cellulose pom dav siv nyob rau hauv ntau yam lag luam, los ntawm textiles mus rau pharmaceuticals. Nkag siab txog cov txheej txheem tom qab cellulose qhov nqus dej yog qhov tseem ceeb rau kev ua kom zoo dua nws siv hauv ntau daim ntawv thov.
Taw qhia:
Cellulose, polysaccharide tsim los ntawm cov piam thaj txuas los ntawm β (1 → 4) glycosidic bonds, yog lub hauv paus txheej txheem ntawm cov phab ntsa ntawm cov nroj tsuag. Nws txoj kev nplua nuj nyob rau hauv qhov, rov ua dua tshiab, thiab biodegradability ua rau nws yog ib qho khoom tsim nyog rau ntau daim ntawv thov kev lag luam. Ib qho txiaj ntsig zoo ntawm cellulose yog nws lub peev xwm nqus dej kom zoo. Cov yam ntxwv no muaj kev cuam tshuam tseem ceeb hauv ntau yam xws li textiles, papermaking, zaub mov, tshuaj, thiab biomaterials. Nkag siab txog cov txheej txheem hauv qab cellulose tus cwj pwm nqus dej yog qhov tseem ceeb rau kev siv nws lub peev xwm tag nrho hauv cov ntawv thov no.
Cov yam ntxwv cuam tshuam rau kev nqus dej los ntawm Cellulose:
Ntau yam cuam tshuam rau lub peev xwm nqus dej ntawm cellulose:
Crystallinity: Cov qauv crystalline ntawm cellulose cuam tshuam rau nws cov dej nqus dej. Cov cheeb tsam crystalline nthuav tawm cov dej nqus qis dua piv rau cov cheeb tsam amorphous vim txwv tsis pub nkag mus rau cov dej molecules.
Surface Area: Qhov chaw saum npoo ntawm cellulose fibers plays lub luag haujlwm tseem ceeb hauv kev nqus dej. Finely faib cellulose nrog thaj tsam siab dua yuav nqus dej ntau dua piv rau cov qauv cellulose bulkier.
Hydrophilicity: Hydroxyl (-OH) pawg muaj nyob rau hauv cellulose molecules ua rau lawv hydrophilic, pab txhawb dej nqus los ntawm hydrogen bonding.
Qib ntawm Polymerization: Cellulose nrog qib siab ntawm polymerization zoo li muaj peev xwm nqus dej ntau dua vim tias muaj ntau pawg hydroxyl hauv ib chav tsev loj.
Kub thiab txheeb ze humidity: Ib puag ncig tej yam kev mob xws li kub thiab txheeb ze humidity cuam tshuam rau cellulose tus cwj pwm nqus dej. Qhov kub thiab av noo ntau dua feem ntau txhim khu kev nqus dej vim muaj zog ntawm cov dej molecules.
Method of Characterization:
Ntau cov tswv yim yog ua haujlwm los qhia txog cov dej nqus dej ntawm cellulose:
Gravimetric Analysis: Txoj kev Gravimetric suav nrog ntsuas qhov hnyav nce ntawm cov qauv cellulose thaum raug dej dhau sijhawm. Qhov no muab cov ntaub ntawv ntau ntawm cov dej nqus dej kinetics thiab cov ntsiab lus sib npaug ntawm cov dej noo.
Fourier Transform Infrared Spectroscopy (FTIR): FTIR spectroscopy yog siv los txheeb xyuas cov kev hloov pauv hauv pawg ua haujlwm ntawm cellulose thaum nqus dej. Kev hloov hauv qhov chaw siab tshaj plaws thiab kev siv zog qhia txog kev sib cuam tshuam ntawm cellulose thiab dej molecules.
X-ray Diffraction (XRD): XRD yog ua haujlwm los soj ntsuam cov kev hloov hauv cellulose crystallinity tom qab nqus dej. Kev txo qis hauv crystallinity Performance index qhia tias o ntawm cellulose fibers vim dej uptake.
Scanning Electron Microscopy (SEM): SEM tso cai rau qhov pom ntawm kev hloov pauv ntawm cov cellulose fibers ua ntej thiab tom qab nqus dej. Nws muab kev nkag siab rau hauv cov qauv kev ncaj ncees thiab porosity ntawm cov ntaub ntawv cellulose.
Kev siv Cellulose ua cov khoom siv Hygroscopic:
Lub hygroscopic xwm ntawm cellulose pom ntau daim ntawv thov nyob rau hauv ntau yam lag luam:
Textiles: Cellulose-raws li fibers xws li paj rwb thiab rayon feem ntau siv nyob rau hauv textile manufacturing vim lawv muaj peev xwm nqus noo noo, muab kev nplij siab thiab breathability rau khaub ncaws.
Papermaking: Cellulose fibers yog cov khoom siv tseem ceeb hauv kev tsim cov ntawv. Lawv cov khoom nqus dej cuam tshuam rau daim ntawv zoo, luam tawm, thiab lub zog.
Kev lag luam khoom noj khoom haus: Cellulose derivatives xws li methylcellulose thiab carboxymethylcellulose yog ua hauj lwm ua thickening agents, stabilizers, thiab emulsifiers hauv cov khoom noj. Lawv lub peev xwm nqus dej txhim kho kev ntxhib los mos thiab txee lub neej ruaj khov.
Pharmaceuticals: Cellulose-based excipients feem ntau yog siv rau hauv cov tshuaj formulations rau lawv lub peev xwm los tswj cov tshuaj tso tawm, txhim kho kev ruaj ntseg, thiab txhim kho bioavailability. Lawv kuj pab nyob rau hauv disintegration thiab dissolution ntawm cov ntsiav tshuaj thiab tsiav tshuaj.
Biomaterials: Cellulose hydrogels thiab cov yeeb yaj kiab tau tshwm sim los ua cov khoom siv biomaterials rau ntau yam kev siv biomedical, suav nrog kev xa tshuaj, cov ntaub so ntswg engineering, thiab kho qhov txhab. Lawv lub peev xwm nqus dej siab ua kom muaj dej txaus thiab kev loj hlob ntawm tes.
Cellulose lub peev xwm zoo kawg nkaus nqus dej stems los ntawm nws cov yam ntxwv tshwj xeeb thiab tshuaj lom neeg. Nkag siab txog cov yam ntxwv cuam tshuam rau kev nqus dej, cov txheej txheem ntawm tus cwj pwm, thiab kev siv cellulose ua cov khoom siv hygroscopic yog qhov tseem ceeb rau kev ua kom zoo dua nws siv hauv ntau yam lag luam. Kev tshawb fawb txuas ntxiv hauv daim teb no yuav nthuav dav ntxiv rau ntau yam ntawm cov ntawv thov thiab pab txhawb rau kev tsim cov khoom siv ruaj khov nrog kev txhim kho kev ua tau zoo.
Lub sij hawm xa tuaj: Mar-29-2024