Eter cellulose waa maaddo polymer ah oo muhiim ah oo si weyn loogu isticmaalo qalabka dhismaha, daawada, cuntada iyo beeraha kale. Hantida biyaha haynta ayaa ah mid ka mid ah qodobbada muhiimka ah ee doorkeeda codsiyo badan. Waxqabadka xajinta biyaha waxay si toos ah u saameeyaan ku dhejinta, ductility iyo waxqabadka dhismaha ee alaabta. Heerka etherification iyo heerkulka ether cellulose waa laba qaybood oo muhiim ah oo saameeya haynta biyaha.
Saamaynta heerka etherification ee ether cellulose ee haynta biyaha
Ether-yada Cellulose waxaa la sameeyay iyagoo u beddelaya qaybta hydroxyl ee cellulose kooxo ether ah. Heerka etherification waxaa loola jeedaa tirada kooxaha ether ee lagu soo bandhigay unug kasta oo gulukoos, kaas oo loo isticmaalo in lagu cabbiro heerka beddelka ethers cellulose. Heerka etherification ayaa saameyn weyn ku leh haynta biyaha ee ethers cellulose. Guud ahaan, marka heerka etherification uu kordho, hydrophilicity ee ether cellulose ayaa kor u kaca, iyo waxqabadkeeda xajinta biyaha ayaa sidoo kale kordhiya.
Heerka sare ee etherification, kooxo badan oo hydrophilic ah (sida methoxy, ethoxy, iwm.) ayaa la galiyay silsiladda unugyada ether-ka ee cellulose. Kooxahani waxay la falgali karaan molecules biyaha iyada oo loo marayo bonds hydrogen, xoojinta cellulose Awoodda adsorption ee ether ilaa molecules biyaha. Sidaa darteed, ether-ka cellulose ee leh heerar sare oo etherification ah ayaa nuugi kara oo ku hayn kara biyo badan deegaanka qoyan, taas oo ka dhigaysa kuwo aad u fiican guryaha biyaha.
Si kastaba ha ahaatee, heerka sare ee etherification, ayaa ka sii fiican. Marka heerka etherification uu gaaro heer gaar ah, haynta biyaha ee ether-ka cellulose waxaa laga yaabaa inaysan sii wadi doonin kordhinta kororka heerka etherification, oo xitaa laga yaabo inay hoos u dhacdo. Tani waa sababta oo ah marka etherification uu aad u sarreeyo, qaabka silsiladda unugyada ether-ka ee cellulose ayaa laga yaabaa inay isbeddelaan, taasoo keentay daciifinta xoogga intermolecular, ugu dambeyntii saameyn ku yeelata nuugista biyaha iyo xajinta biyaha. Sidaa darteed, codsiyada wax ku oolka ah, ethers cellulose oo leh darajooyin etherification ku habboon ayaa loo baahan yahay in lagu doorto iyadoo loo eegayo xaalado gaar ah.
Saamaynta heerkulka ku haynta biyaha ee ethers cellulose
Heerkulka waa arrin kale oo saameyn muhiim ah ku leh haynta biyaha ee ethers cellulose. Xaaladaha heerkulka kala duwan, sifooyinka biyaha ee ethers cellulose waxay u dhaqmaan si ka duwan. Caadi ahaan, kororka heerkulka ayaa u horseedi doona hoos u dhigista biyaha ee ethers cellulose. Tani waxay u badan tahay sababtoo ah heerkulka kor u kaca ayaa dedejiya uumi-baxa biyaha, taas oo adkeynaysa walxaha si ay u ceshadaan qoyaanka.
Heerkulka hoose, isdhexgalka u dhexeeya unugyaraha ether-ka cellulose iyo molecules biyuhu waa xoog badan yahay, taasoo keentay in biyo-haysasho wanaagsan ay helaan. Marka uu heerkulku kordho, unugyada biyuhu si degdeg ah ayay u baxaan, awoodda haynta biyaha ee ether-ka cellulose-ka ayaa si tartiib tartiib ah u daciifaysa. Intaa waxaa dheer, heerkulka kordhay wuxuu saameyn karaa milanka ethers cellulose. Xaaladaha heerkulka sare ee qaarkood, ether-ka cellulose waxaa laga yaabaa inuu lumiyo milanka oo ku guuldareysto inuu sameeyo xal isku mid ah ama kolloid, taas oo saameynaysa waxqabadkeeda xajinta biyaha.
Waxaa habboon in la ogaado in noocyada kala duwan ee ethers cellulose ay leeyihiin dareeno kala duwan oo isbeddelka heerkulka. Qaar ka mid ah ether-ka cellulose-ka ayaa wali sii hayn kara haynta biyaha ee heerkul sare, halka kuwa kale ay la kulmi doonaan hoos u dhac weyn oo ku saabsan xajinta biyaha marka heerkulku kor u kaco. Sidaa darteed, marka la dooranayo ether cellulose, waxaa lagama maarmaan ah in la sameeyo doorasho habboon oo ku salaysan xaaladaha heerkulka deegaanka isticmaalka.
Isdhexgalka u dhexeeya heerka etherification iyo heerkulka
Saamaynta shahaadada etherification iyo heerkulka ku haynta biyaha ee etherka cellulose ayaa inta badan is dhexgal ah. Codsiyada la taaban karo, labadan arrimood ayaa inta badan u baahan in si buuxda loo tixgeliyo. Tusaale ahaan, marka ether cellulose oo leh heer sare oo etherification ah loo isticmaalo jawi heerkulkiisu sarreeyo, inkastoo heerka sare ee etherification uu kor u qaadi karo haynta biyaha ee etherka cellulose, heerka uumiga biyaha ee jawi heerkul sare ah ayaa sidoo kale noqon doona. loo dardargeliyay si waafaqsan, sidaas darteed wiiqday saameynteeda haynta biyaha ee dhabta ah. Sidaa darteed, jawiga heerkulka sare, waxaa laga yaabaa inay lagama maarmaan noqoto in la isticmaalo ethers cellulose leh qaabab si gaar ah loo bedelay si loo hagaajiyo caabbinta heerkulka sare iyo xajinta biyaha.
Taas beddelkeeda, jawiga heerkulka hooseeya, saameynta shahaadada etherification ee haynta biyaha ee etherka cellulose ayaa laga yaabaa inay aad u caddahay. Xaaladaha heerkulka hooseeya, biyuhu si tartiib tartiib ah ayey u baxaan, iyo cellulose ether oo leh heer sare oo etherification ah ayaa si buuxda u shaqeyn kara awoodda nuugista biyaha, taas oo hagaajinaysa waxqabadka xajinta biyaha ee alaabta.
Heerka etherification iyo heerkulka ether cellulose waa arrimo muhiim ah oo saameeya waxqabadkeeda haynta biyaha. Heerarka sare ee etherification, ayaa sii xoogeysanaya hydrophilicity ee etherka cellulose iyo si ka sii wanaagsan waxqabadka xajinta biyaha. Si kastaba ha ahaatee, heer aad u sarreeya oo etherification ah ayaa laga yaabaa inay u horseedi karto isbeddel ku yimaada qaabdhismeedka molecular, taas oo saameynaysa xajinta biyaha. Heerkulka kor u kaca ayaa badanaa keena hoos u dhaca haynta biyaha ee ethers cellulose. Gaar ahaan jawiga heerkulka sare, uumi-baxa biyuhu wuu dedejiyaa, saamaynaya saamaynta xajinta biyaha. Codsiyada wax ku oolka ah, waxaa lagama maarmaan ah in la doorto ether cellulose oo leh heer ku habboon etherification oo ku salaysan xaaladaha heerkulka gaarka ah iyo shuruudaha isticmaalka si loo gaaro saameynta ugu wanaagsan ee biyaha lagu hayo.
Waqtiga post: Seb-18-2024