Qaab dhismeedka caadiga ah ee labaethers cellulosewaxaa lagu bixiyay jaantusyada 1.1 iyo 1.2.Canab kasta oo β-D fuuqbaxay oo ah unugyadi cellulose
Unugga sonkorta (cutubka soo noqnoqda ee cellulose) ayaa lagu beddelaa hal koox ether midkiiba boosaska C (2), C (3) iyo C (6), tusaale ahaan ilaa saddex
koox ether ah.Sababtoo ah joogitaanka kooxaha hydroxyl, macromolecules cellulose waxay leeyihiin bond intramolecular iyo intermolecular hydrogen bonds, kuwaas oo ay adag tahay in ay ku milmaan biyaha.
Way adag tahay in lagu milmo ku dhawaad dhammaan dareerayaasha organic.Si kastaba ha noqotee, ka dib markii etherification ee cellulose, kooxaha etherka ayaa lagu soo bandhigay silsiladda kelli,
Sidan oo kale, isku xidhka hydrogen ee gudaha iyo inta u dhaxaysa molecules of cellulose waa la burburiyaa, iyo hydrophilicity sidoo kale waa la wanaajiyey, si ay u milmaheeda loo hagaajiyo.
si weyn ayaa loo hagaajiyay.Waxaa ka mid ah, Jaantuska 1.1 waa qaab-dhismeedka guud ee laba unug anhydroglucose ah silsiladda unugyada ether cellulose, R1-R6=H
ama bedelaadaha organic.1.2 waa qayb ka mid ah silsiladda molecular carboxymethyl hydroxyethyl cellulose, heerka beddelka karboxymethyl waa 0.5,4
Darajada beddelka ee hydroxyethyl waa 2.0, iyo heerka beddelka molarku waa 3.0.
Beddel kasta oo cellulose ah, wadarta qaddarka etherification-keeda waxaa lagu muujin karaa heerka beddelka (DS).ka samaysan fiilooyinka
Waxaa laga arki karaa qaab dhismeedka molecule-ka koowaad in heerka beddelku uu u dhaxeeyo 0-3.Taasi waa, giraanta unugyada anhydroglucose kasta ee cellulose
, celceliska tirada kooxaha hydroxyl oo lagu beddelay kooxaha etherifying wakiilka etherifying.Sababtoo ah kooxda hydroxyalkyl ee cellulose, beddelkeeda
Etherification waa in laga bilaabo kooxda cusub ee hydroxyl ee bilaashka ah.Sidaa darteed, heerka beddelka noocaan ether cellulose waxaa lagu muujin karaa jiirka.
heerka beddelka (MS).Waxa loogu yeero darajada molar ee beddelka waxay muujineysaa qadarka wakiilka etherifying ee lagu daray unug kasta oo anhydroglucose ah ee cellulose
Celceliska cufka falcelinta.
1 Qaab dhismeedka guud ee unugga gulukoosta
2 Jajabka silsiladaha molecular ether cellulose
1.2.2 Kala soocida ethers cellulose
Haddii ether-yada cellulose ay yihiin hal ethers ama ethers isku dhafan, hantidoodu xoogaa way ka duwan tahay.Makromolecules cellulose
Haddii kooxda hydroxyl ee giraanta unugga lagu beddelo koox hydrophilic ah, alaabtu waxay yeelan kartaa heer hoose oo beddelaad ah iyada oo la raacayo shuruudda heerka hoose ee beddelka.
Waxay leedahay milmi biyo gaar ah;haddii lagu beddelo koox hydrophobic ah, alaabtu waxay leedahay heer cayiman oo beddelaad ah oo keliya marka heerka beddelku yahay dhexdhexaad.
Biyaha-milmi kara, waxsoosaarka etherification cellulose oo aan la beddelin ayaa kaliya ku barari kara biyaha, ama waxay ku milmi karaan xalalka alkali ee xoogga yar
dhexe.
Marka loo eego noocyada beddelka, ethers cellulose waxaa loo qaybin karaa saddex qaybood: kooxaha alkyl, sida methyl cellulose, ethyl cellulose;
Hydroxyalkyls, sida hydroxyethyl cellulose, hydroxypropyl cellulose;kuwa kale, sida carboxymethyl cellulose, iwm. Haddii ionization ah
Kala soocida, ethers cellulose waxaa loo qaybin karaa: ionic, sida carboxymethyl cellulose;non-ionic, sida hydroxyethyl cellulose;isku qasan
nooca, sida hydroxyethyl carboxymethyl cellulose.Marka loo eego kala-soocidda milanka, cellulose waxaa loo qaybin karaa: biyo-milmi kara, sida carboxymethyl cellulose,
Hydroxyethyl cellulose;biyaha aan milmi karin, sida methyl cellulose, iwm.
1.2.3 Guryaha iyo codsiyada ethers cellulose
Eter cellulose waa nooc ka mid ah badeecada ka dib markii wax laga beddelo etherification cellulose, iyo ether cellulose waxay leedahay sifooyin badan oo muhiim ah.sida
Waxay leedahay sifooyin filim-samayn wanaagsan;sida koollada daabacaadda, waxay leedahay milanka biyaha wanaagsan, sifooyinka dhumucda, haynta biyaha iyo xasilloonida;
5
Ether-ka cad waa mid aan ur lahayn, aan sun ahayn, oo waxa uu leeyahay laqabsi wanaagsan.Waxaa ka mid ah, karboxymethyl cellulose (CMC) waxay leedahay " monosodium glutamate warshadaha "
naanays.
1.2.3.1 Samaynta Filimka
Heerka etherification ee ether-ka cellulose wuxuu saameyn weyn ku leeyahay astaamihiisa sameynta filimada sida awoodda sameynta filimada iyo xoogga isku xirnaanta.Eter cellulose
Sababtoo ah xooggeeda farsamo ee wanaagsan iyo is-waafajinta wanaagsan ee resins kala duwan, waxaa loo isticmaali karaa filimada caagga ah, xabagta iyo alaabta kale.
diyaarinta walxaha.
1.2.3.2 Solubility
Sababtoo ah jiritaanka kooxo badan oo hydroxyl ah oo ku yaal giraanta unugga gulukooska oksijiinta ku jirta, ethers cellulose waxay leeyihiin milmayn biyo oo wanaagsan.iyo
Iyada oo ku xidhan beddelka etherka cellulose iyo heerka beddelka, waxa kale oo jira xulasho kala duwan ee dareerayaasha organic.
1.2.3.3 Dhumucda
Eter cellulose waxaa lagu kala diraa xal aqueous qaab kolloid ah, halkaas oo heerka polymerization ether cellulose go'aamiyo cellulose.
Viscosity ee xal ether ah.Si ka duwan dareerayaasha Newtonian, viscosity ee xalal ether cellulose isbedel xoog xiirid, iyo
Sababtoo ah qaabkan macromolecules-ka, mawduuca xalku wuxuu si degdeg ah u kordhin doonaa kororka maadada adag ee etherka cellulose, si kastaba ha ahaatee xalka xalka
Viscosity sidoo kale si degdeg ah ayuu hoos ugu dhacaa heerkulka sii kordhaya [33].
1.2.3.4 Xumaan
Xalka ether-ka cellulose ee biyaha ku milmay muddo wakhti ah ayaa kori doona bakteeriyada, taas oo soo saari doonta bakteeriyada enzyme iyo burburinta wajiga ether-ka cellulose.
Cutubka gulukooska ee aan la bedelin ee ku xiga, taaso hoos u dhigaysa cufka molecular ee makromolecule.Sidaa darteed, ethers cellulose
Ilaalinta xalalka aqueous waxay u baahan tahay in lagu daro qadar go'an oo ah ilaalinta.
Intaa waxaa dheer, ethers cellulose waxay leeyihiin waxyaabo kale oo badan oo gaar ah sida dhaqdhaqaaqa dusha sare, dhaqdhaqaaqa ionic, xasilloonida xumbo iyo wax lagu daro.
fal gal.Sababo la xiriira guryahan, ether-ka cellulose waxaa loo isticmaalaa dunta, waraaqaha samaynta, saabuunta synthetic, waxyaalaha la isku qurxiyo, cuntada, daawada,
Waxaa si weyn looga isticmaalaa meelo badan.
1.3 Hordhaca alaabta ceeriin ee dhirta
Marka laga eego dulmarka 1.2 cellulose ether, waxaa la arki karaa in alaabta ceeriin ee diyaarinta ether cellulose ay u badan tahay cellulose suuf ah, iyo mid ka mid ah waxyaabaha ku jira mawduucan.
Waa in la isticmaalo cellulose laga soo saaro alaabta ceeriin ee dhirta si loogu beddelo cellulose suuf si loogu diyaariyo ether cellulose.Kuwa soo socda waa hordhac gaaban oo ku saabsan geedka
maaddo.
Maaddaama kheyraadka guud sida saliidda, dhuxusha iyo gaaska dabiiciga ah ay sii yaraanayaan, horumarinta wax soo saarka kala duwan ee iyaga ku saleysan, sida fiilooyinka synthetic iyo fiilooyinka fiber-ka, sidoo kale waa la xaddidi doonaa.Horumarka joogtada ah ee bulshada iyo wadamada aduunka (gaar ahaan
Waa waddan horumaray) oo aad ugu fiirsada dhibaatada wasakhowga deegaanka.cellulose dabiiciga ah waxay leedahay biodegradability iyo isuduwidda deegaanka.
Waxay si tartiib tartiib ah u noqon doontaa isha ugu weyn ee walxaha fiber-ka.
Waqtiga post: Seb-26-2022