Polyanionic cellulose (PAC) yog ib qho tshuaj hloov kho ntawm cellulose, uas yog ib txwm tshwm sim polysaccharide pom nyob rau hauv cell phab ntsa ntawm cov nroj tsuag.PAC feem ntau yog siv rau hauv ntau yam lag luam, suav nrog roj drilling, ua zaub mov, tshuaj, thiab tshuaj pleev ib ce, vim nws cov khoom siv tshuaj lom neeg tshwj xeeb.Nws cov tshuaj muaj pes tsawg leeg, qauv, thiab cov khoom ua rau nws yog ib qho tseem ceeb additive nyob rau hauv ntau daim ntawv thov.
Cellulose Structure:
Cellulose yog ib tug linear polysaccharide tsim los ntawm rov qab units ntawm β-D-glucose molecules txuas los ntawm β (1 → 4) glycosidic bonds.Txhua chav tsev piam thaj muaj peb pawg hydroxyl (-OH), uas yog qhov tseem ceeb rau kev hloov kho tshuaj.
Kev hloov kho tshuaj:
Polyanionic cellulose yog tsim los ntawm kev hloov kho tshuaj ntawm cellulose.Cov txheej txheem hloov kho cuam tshuam nrog kev qhia txog cov pab pawg anionic mus rau cov pob txha cellulose, muab nws nrog cov khoom tshwj xeeb.Feem ntau cov kev hloov kho cellulose muaj xws li etherification thiab esterification cov tshuaj tiv thaiv.
Anionic pawg:
Cov pab pawg anionic ntxiv rau cellulose thaum hloov kho cov khoom siv polyanionic rau cov txiaj ntsig polymer.Cov pab pawg no tuaj yeem suav nrog carboxylate (-COO⁻), sulfate (-OSO₃⁻), lossis phosphate (-OPO₃⁻) pawg.Kev xaiv ntawm pawg anionic nyob ntawm qhov xav tau thiab cov kev xav tau ntawm polyanionic cellulose.
Chemical Composition ntawm PAC:
Cov tshuaj muaj pes tsawg leeg ntawm polyanionic cellulose sib txawv nyob ntawm seb cov txheej txheem synthesis tshwj xeeb thiab daim ntawv thov npaj.Txawm li cas los xij, feem ntau, PAC muaj feem ntau ntawm cov pob txha cellulose nrog anionic pawg txuas rau nws.Qhov degree ntawm kev hloov pauv (DS), uas hais txog qhov nruab nrab ntawm cov anionic pawg ib chav tsev piam thaj, tuaj yeem sib txawv thiab cuam tshuam rau cov khoom ntawm PAC.
Piv txwv Chemical Structure:
Ib qho piv txwv ntawm cov qauv tshuaj ntawm polyanionic cellulose nrog carboxylate pawg yog raws li nram no:
Polyanionic Cellulose Structure
Nyob rau hauv cov qauv no, lub voj voog xiav sawv cev rau cov piam thaj hauv cov pob txha cellulose, thiab lub voj voog liab sawv cev rau pawg carboxylate anionic pawg (-COO⁻) txuas rau qee qhov ntawm cov piam thaj.
Khoom:
Polyanionic cellulose nthuav tawm ntau yam khoom tsim nyog, suav nrog:
Kev hloov kho Rheology: Nws tuaj yeem tswj cov viscosity thiab cov kua dej poob hauv ntau yam kev siv, xws li cov dej drilling hauv kev lag luam roj.
Kev tuav dej: PAC tuaj yeem nqus tau thiab khaws cov dej, ua rau nws muaj txiaj ntsig zoo hauv cov khoom uas yuav tsum tau tswj cov dej noo, xws li cov khoom noj khoom haus lossis cov tshuaj formulations.
Stability: Nws txhim khu kev ruaj ntseg thiab kev ua tau zoo nyob rau hauv ntau yam formulations los ntawm kev tiv thaiv theem sib cais los yog aggregation.
Biocompatibility: Hauv ntau daim ntawv thov, PAC yog biocompatible thiab tsis muaj tshuaj lom, ua rau nws haum rau kev siv tshuaj thiab khoom noj khoom haus.
Daim ntawv thov:
Polyanionic cellulose pom cov ntawv thov hauv ntau hom kev lag luam:
Roj drilling kua: PAC yog ib qho tseem ceeb additive nyob rau hauv drilling av nkos los tswj viscosity, kua poob, thiab shale inhibition.
Kev ua zaub mov: Nws yog siv los ua cov thickener, stabilizer, los yog dej tuav tus neeg sawv cev hauv cov khoom noj xws li kua ntses, hnav khaub ncaws, thiab dej haus.
Pharmaceuticals: PAC ua hauj lwm raws li ib tug binder, disintegrant, los yog viscosity modifier nyob rau hauv cov ntsiav tshuaj formulations, suspensions, thiab tshuaj pleev ib ce.
Tshuaj pleev ib ce: Nws yog siv nyob rau hauv cov khoom tu tus kheej xws li cream, tshuaj pleev ib ce, thiab tshuaj zawv plaub hau los muab viscosity tswj thiab stability.
Kev tsim khoom:
Kev tsim cov txheej txheem ntawm polyanionic cellulose muaj ob peb kauj ruam:
Cellulose Sourcecing: Cellulose feem ntau yog muab los ntawm cov ntaub ntoo los yog paj rwb linters.
Kev hloov kho tshuaj: Cellulose tau txais etherification lossis esterification cov tshuaj tiv thaiv los qhia cov pab pawg anionic mus rau cov piam thaj.
Purification: Hloov kho cellulose yog purified kom tshem tawm impurities thiab by-products.
Kev ziab thiab ntim: Cov purified polyanionic cellulose yog qhuav thiab ntim rau kev faib mus rau ntau yam lag luam.
polyanionic cellulose yog ib qho kev hloov kho derivative ntawm cellulose nrog anionic pawg txuas nrog cellulose qaum.Nws cov tshuaj muaj pes tsawg leeg, suav nrog hom thiab qhov ntom ntawm pawg anionic, txiav txim siab nws cov khoom thiab tsim nyog rau ntau yam kev siv hauv kev lag luam xws li roj drilling, kev ua zaub mov, tshuaj, thiab tshuaj pleev ib ce.Los ntawm kev tswj xyuas meej ntawm nws cov synthesis thiab formulation, polyanionic cellulose tseem yog ib qho tseem ceeb additive nyob rau hauv ntau yam khoom thiab cov txheej txheem thoob ntiaj teb.
Lub sij hawm xa tuaj: Plaub Hlis-11-2024