Wax ka beddelka etherification cellulose

01. Hordhaca cellulose

Cellulose waa polysaccharide macromolecular oo ka kooban gulukoos. Aan ku milmin biyaha iyo dareerayaasha guud ee organic. Waa qaybta ugu muhiimsan ee gidaarka unugyada dhirta, iyo sidoo kale waa polysaccharide ugu baahsan iyo ugu badan ee dabiiciga ah.

Cellulose waa kheyraadka dib loo cusboonaysiin karo ee ugu badan ee dhulka, sidoo kale waa polymer-ka dabiiciga ah ee leh ururinta ugu weyn. Waxay leedahay faa'iidooyinka in la cusboonaysiin karo, gebi ahaanba noolayn karo, iyo ku habboonaanta noole ee wanaagsan.

02. Sababaha wax ka beddelka cellulose

Makromolecules Cellulose waxa ku jira tiro badan oo ah kooxaha -OH. Saamaynta curaarta hydrogen awgeed, xoogga u dhexeeya makromolecules waa mid aad u weyn, taas oo horseedi doonta dhalaal weyn oo enthalpy △H; Dhanka kale, waxaa jira siddo ku jira macromolecules cellulose. Sida qaab-dhismeedka, qallafsanaanta silsiladda molecular ayaa ka weyn, taas oo u horseedi doonta isbeddel yar oo entropy isbeddel ah ΔS. Labadan sababood ayaa ka dhigaya heerkulka cellulose dhalada ah (= △H / △S) ayaa sare u kici doona, heerkul-ku-furanka cellulose-kuna waa mid hooseeya. Sidaa darteed, marka cellulose lagu kululeeyo heerkul gaar ah, fiilooyinka ayaa soo baxaya ifafaale ah in cellulose uu burburay ka hor inta uusan bilaabin inuu dhalaaliyo, sidaas darteed, farsamaynta alaabta cellulose ma qaadan karto habka dhalaalidda marka hore ka dibna qaabeynta.

03. Muhiimadda wax ka beddelka cellulose

Iyada oo ay si tartiib tartiib ah u yaraatay kheyraadka fosil iyo dhibaatooyinka deegaanka ee sii kordhaya ee halista ah ee ay sababaan qashinka kiimikada fiber-ka dunta, horumarinta iyo ka faa'iidaysiga agabka fiber-ka dabiiciga ah ee dib loo cusboonaysiin karo ayaa noqday mid ka mid ah meelaha kulul ee ay dadku fiiro gaar ah u yeeshaan. Cellulose waa kheyraadka dabiiciga ah ee dib loo cusboonaysiin karo ee ugu badan. Waxay leedahay sifooyin aad u fiican sida hygroscopicity wanaagsan, antistatic, hawo xoog badan, midabayn wanaagsan, xidhasho raaxo leh, farsamayn fudud oo dhar ah, iyo biodegradability. Waxay leedahay astaamo aan la barbar dhigi karin fiilooyinka kiimikada. .

Unugyada Cellulose waxa ku jira tiro badan oo ah kooxo hydroxyl ah, kuwaas oo ay fududahay in la sameeyo isku xidhka hydrogen intramolecular iyo intermolecular, oo ku qurmay heerkul sare iyada oo aan dhalaalin. Si kastaba ha ahaatee, cellulose waxay leedahay falcelin wanaagsan, iyo bonds hydrogen waxaa lagu burburin karaa wax ka beddelka kiimikada ama falcelinta tallaalka, taas oo si wax ku ool ah hoos u dhigi karta barta dhalaalka. Sida noocyada kala duwan ee wax soo saarka warshadaha, waxaa si weyn loogu isticmaalaa dunta, kala-soocidda xuubka, balaastikada, tubaakada iyo dahaarka.

04. Wax ka beddelka etherification cellulose

Cellulose ether waa nooc ka mid ah derivative cellulose helay by etherification beddelka ee cellulose. Waxaa si weyn loo isticmaalaa ay sabab u tahay dhumucdiisuna aad u fiican, emulsification, ganaax, samaynta filimada, kolloid ilaalinta, haynta qoyaan, iyo guryaha adhesion. Loo isticmaalo cuntada, daawada, samaynta waraaqaha, rinjiga, qalabka dhismaha, iwm.

Etherification of cellulose waa taxane taxane ah oo ay soo saaraan falcelinta kooxaha hydroxyl ee silsiladda molecular cellulose oo leh walxo alkylating ah oo hoos yimaada xaaladaha alkaline. Isticmaalka kooxaha hydroxyl waxay yaraynaysaa tirada isku xidhka hydrogen intermolecular si loo yareeyo xoogagga intermolecular, taas oo kor u qaadeysa xasiloonida kulaylka ee cellulose, wanaajiso waxqabadka qalabka, isla mar ahaantaana la yareeyo barta dhalaalka ee cellulose.

Tusaalooyinka saamaynta wax ka beddelka etherification ee hawlaha kale ee cellulose:

Isticmaalka suufka la safeeyey sida alaabta ceeriin ee aasaasiga ah, cilmi-baarayaashu waxay isticmaaleen habka etherification hal-tallaabo ah si ay u diyaariyaan ether-ka adag ee karboxymethyl hydroxypropyl cellulose oo leh falcelin isku mid ah, viscosity sare, caabbinta acid wanaagsan iyo caabbinta milixda iyada oo loo marayo alkalization iyo falcelinta etherification. Isticmaalka habka etherification hal-tallaabo, karboxymethyl hydroxypropyl cellulose soo saaray waxay leedahay iska caabin milix wanaagsan, caabin acid iyo milanka. Marka la beddelo qiyaasta qiyaasta propylene oxide iyo chloroacetic acid, alaabada leh karboxymethyl iyo ka kooban hydroxypropyl kala duwan ayaa la diyaarin karaa. Natiijooyinka imtixaanku waxay muujinayaan in karboxymethyl hydroxypropyl cellulose soo saaray hab hal-tallaabo uu leeyahay wareegga wax soo saarka gaaban, isticmaalka dareeraha hoose, iyo alaabta ayaa iska caabin heer sare ah si monovalent iyo divalent cusbada iyo caabbinta acid wanaagsan.

05. Rajada wax ka beddelka etherification cellulose

Cellulose waa walxo kimikal iyo kiimiko ah oo muhiim ah oo qani ku ah kheyraad, cagaar iyo deegaan u wanaagsan, lana cusboonaysiin karo. Astaamaha wax-ka-beddelka etherification cellulose waxay leeyihiin waxqabad aad u fiican, adeegsiyo ballaaran iyo saameyn isticmaalka wanaagsan, waxayna daboolaan baahida dhaqaalaha qaranka ilaa xad. Iyo baahiyaha horumarinta bulshada, iyadoo horumarka tignoolajiyada ee joogtada ah iyo xaqiijinta ganacsiga mustaqbalka, haddii alaabta ceeriin ee synthetic iyo hababka synthetic ee ka soo jeeda cellulose ay noqon karaan kuwo badan oo warshadaysan, waxay noqon doonaan kuwo si buuxda looga faa'iidaysto oo ay ogaadaan codsiyo ballaadhan oo ballaadhan. . Qiimaha