Cellulose Cov chav kawm yog muaj kev nyiam ua ke ntawm cov tebchaw tau los ntawm cellulose, ib qho ntawm cov muaj txiaj ntsig zoo tshaj plaws hauv ntiaj teb. Cov ntaub ntawv no pom cov ntawv thov hla dhau kev lag luam, suav nrog cov tshuaj, khoom noj, cov tshuaj pleev, thiab cov ntawv siv, vim lawv cov haujlwm tshwj xeeb thiab kev ua haujlwm.
1. Cov qauv thiab cov khoom ntawm cellulose:
Cellulose yog polysaccharide muaj cov saw ntev ntawm cov chav dej qab zib ntev txuas ua ke los ntawm β (1 → 4) glycosidic bonds. Cov chav dej qab zib rov qab muab cov cellulose nrog cov qauv linear thiab nruj. Cov txheej txheem txheej txheem no tau ua rau muaj zog hydrogen sib txuas ntawm cov saw hlau ib sab, ua rau muaj cov khoom siv zoo ntawm cellulose.
Cov pab pawg hydroxyl (-h) tam sim no nyob rau hauv lub cellulose saw ua rau nws kub heev hydrophilic, cia nws nqus thiab khaws cov dej ntau. Txawm li cas los xij, cellulose cov khoom ua kom cov chaw ua haujlwm tsis zoo nyob rau hauv feem ntau cov organic cov kuab tshuaj vim nws cov kev sib txuam hydrogen hydrogen koom tes ua ke.
2. Taw qhia rau Cellulose Muaj Cov Neeg Muaj:
Cellulose Cov neeg muaj kev hais ua ke yog derivatives ntawm cellulose nyob rau hauv uas qee pab pawg hydroxyl tau hloov nrog Pawg Ethere (-or), qhov twg riefents ntau yam organic chaw. Cov kev hloov kho no hloov cov yam ntxwv ntawm cellulose, ua rau nws ntau soluble hauv cov dej ntawm nws cov yam ntxwv hauv nruab nrab, xws li biodegradability thiab tsis muaj tshuaj lom.
3. Khoom cua ntawm cov kws pab cuam cellulose:
Qhov synthesis ntawm cellulose kev ua kom muaj feem cuam tshuam nrog lub etherification ntawm cov pab pawg hydroxyl nrog ntau yam tshuaj tiv thaiv hydroxyl nrog ntau yam tshuaj tiv thaiv ntau yam nyob hauv kev tswj hwm. Cov tshuaj tiv thaiv nquag siv rau lub teb chaws muaj rau lub nroog muaj xws li alkylal Halides, Alkylene Oxides, thiab Alkylal. Cov tshuaj tiv thaiv xws li qhov kub thiab txias, cov kuab tshuaj, thiab catalysts ua si lub luag haujlwm tseem ceeb hauv kev txiav txim siab tus lej (DS) thiab cov khoom ntawm lub cellule ether.
4. Hom ntawm cov cellulose muaj cov neeg muaj cai:
Cov neeg hais daws cellulose tuaj yeem faib ua ke raws li cov hloov chaw txuas nrog cov pab pawg hydroxyl. Qee qhov kev hais siv cellulose feem ntau yog:
Methyl Cellulose (MC)
HydroxyPropyl cellulose (HPC)
Hydroxyethyl cellulose (HEC)
Ethyl Hydrotyl Cellulose (EHEC)
Carboxymethyl cellulose (cmc)
Txhua hom cellulose ether cov khoom pov thawj cim thiab haum rau cov ntawv thov tshwj xeeb nyob ntawm nws cov kev siv tshuaj lom neeg thiab qib hloov chaw.
5. Cov yam ntxwv thiab kev siv ntawm Cellulose muaj cov neeg muaj cai:
Cov neeg hais txog cellulose muaj ntau yam muaj txiaj ntsig zoo uas ua rau lawv tsis tseem ceeb hauv ntau yam lag luam:
Thickening thiab ruaj khov: Cov neeg muaj kev hais ua cellulose tau siv dav raws li cov tuab thiab stabilizers hauv cov zaub mov, tshuaj, thiab cov khoom lag luam rau cov khoom ntiag tug. Lawv txhim kho lub viscosity thiab rheological cov yam ntxwv ntawm kev daws teeb meem thiab emulsions, txhim kho cov khoom ruaj khov thiab kev ntxhib los mos.
Zaj duab xis: Cellulose muaj cov neeg muaj peev xwm sau hloov tau thiab pob tshab cov yeeb yaj kiab thaum tawg hauv dej los yog cov kuab tshuaj organic. Cov yeeb yaj kiab no pom cov ntawv thov, ntim khoom, thiab cov tshuaj.
Dej khaws cia: lub hydrophilic xwm ntawm cov cellulose yam uas muaj neeg hais ua ke ua rau lawv nqus dej, ua rau lawv cov cement, tshuaj khib, thiab gypsum cov khoom lag luam. Lawv txhim kho kev ua haujlwm, adhesion, thiab ruaj khov ntawm cov ntaub ntawv no.
Kev xa tawm tshuaj: Cov kws kho mob cellulose tau siv nyob rau hauv cov kws tshuaj muaj nyob hauv cov tshuaj tiv thaiv kom tswj tau cov saj lossis tsw ntxhiab tsw. Lawv feem ntau ua haujlwm hauv cov ntsiav tshuaj, tsiav tshuaj, cov tshuaj pleev, thiab kev ncua.
Kev Kho Mob Deg: Cellulose muaj kev pab cuam los qhia cov pab pawg ua haujlwm xws li cov kev ua kom tiv thaiv antimicrobial, lossis riocompatibilancity. Cov neeg ua haujlwm tau hloov kho no nrhiav cov ntawv thov hauv cov txheej txheem tshwj xeeb, textiles, thiab biomedical cuab yeej.
6. Ib puag ncig cuam tshuam thiab muaj kev ruaj khov:
Cellulose muaj kev hais ua los ntawm cov khoom siv txuas ntxiv xws li ntoo pulp, paj rwb, lossis lwm cov nroj tsuag cov fiber, ua rau lawv muaj cov hmoov av. Tsis tas li ntawd, lawv yog biodegradable thiab tsis muaj tshuaj lom, posing minimal ib puag ncig kev pheej hmoo piv rau hluavtaws polymers. Txawm li cas los xij, cov synthesis ntawm cellulose cov neeg uas muaj kev hais txog cellulos yuav tsum muaj kev tswj hwm kom txo cov pov tseg thiab siv hluav taws xob.
7. Yav dhau los kev nkag siab:
Qhov kev thov rau cellulose cov neeg ua kom muaj kev cuam tshuam ntxiv vim lawv cov yam ntxwv thiab ib puag ncig tus phooj ywg. Kev Tshawb Fawb Txog Kev Tshawb Fawb Txog Kev Tshawb Fawb Txog Kev Tsim Kho Mob Cellulose muaj cov neeg muaj kev hais ua ke nrog kev txhim kho cov haujlwm, txhim kho cov khoom siv rau cov ntawv thov tshwj xeeb. Tsis tas li ntawd, kev sib koom ua ke ntawm cellulose neeg siv ua kev tawm ntawm cov cuab yeej siv 3D, thiab cov ntaub ntawv biomedical tuav rau kev nthuav dav lawv tus nqi ua lag luam.
Cov neeg uas muaj neeg nyob hauv cellulose sawv cev rau cov chav kawm tseem ceeb ntawm cov sib txuas nrog cov ntawv thov sib txawv cov kev lag luam. Lawv cov kev sib xyaw ua ke ntawm cov khoom, biodegradability, thiab sustainability ua rau lawv indispensable cov khoom xyaw hauv ntau cov khoom lag luam thiab cov txheej txheem. Txuas ntxiv tsim kev tsim kho hauv Cellulose ether Chemistry thiab thev naus laus zis yog tsav tsheb txuas ntxiv thiab qhib cov sijhawm tshiab hauv cov xyoo tshiab los.
Lub Sijhawm Post: Apr-18-2024