Thepa ea cationic Cellulose Ether Tharollo

Thepa ea tharollo ea dilute ea high-charge-density cationic cellulose ether (KG-30M) ka litekanyetso tse fapaneng tsa pH e ile ea ithutoa ka sesebelisoa sa ho hasanya laser, ho tloha radius ea hydrodynamic (Rh) ka li-angles tse fapaneng, 'me motso o bolela radius ea lisekoere ea ho potoloha. Rg Karo-karolelano ho Rh e fana ka maikutlo a hore sebopeho sa eona ha se tloaelehe empa se haufi le chitja. Joale, ka thuso ea rheometer, litharollo tse tharo tse tsepamisitsoeng tsa cationic cellulose ethers tse nang le litekanyo tse fapaneng tsa tefiso li ile tsa ithutoa ka botlalo, 'me ho ile ha buisanoa ka tšusumetso ea mahloriso, boleng ba pH le tefiso ea eona ho thepa ea eona ea rheological. Ha mahloriso a ntse a eketseha, motsoako oa Newton o ile oa fokotseha pele 'me oa fokotseha. Ho feto-fetoha ha maemo kapa ho khutlela morao ho etsahala, 'me boitšoaro ba thixotropic bo etsahala ho 3% (karolo ea boima). Tekanyo e leka-lekaneng ea tefiso e molemo ho fumana viscosity e phahameng ea zero-shear, 'me pH e na le phello e fokolang ho viscosity ea eona.

Mantsoe a bohlokoa:cationic cellulose ether; morphology; zero shear viscosity; rheology

Li-cellulose derivatives le li-polymers tsa tsona tse fetotsoeng tse sebetsang li sebelisitsoe haholo masimong a lihlahisoa tsa 'mele le tsa bohloeki, li-petrochemicals, meriana, lijo, lihlahisoa tsa tlhokomelo ea botho, liphutheloana, joalo-joalo. bokhoni, e sebelisoa haholo lik'hemik'hale tsa letsatsi le letsatsi, haholo-holo li-shampoo, 'me li ka ntlafatsa ho kopana ha moriri ka mor'a ho hlatsoa moriri. Ka nako e ts'oanang, ka lebaka la ho lumellana ha eona hantle, e ka sebelisoa ka li-shampoo tse peli-in-one le tsohle-in-one. E boetse e na le tebello e ntle ea ts'ebeliso mme e hohetse tlhokomelo ea linaha tse fapaneng. Lingoliloeng li tlalehile hore litharollo tse tsoang ho cellulose li bonts'a boitšoaro bo kang Newtonian fluid, pseudoplastic fluid, thixotropic fluid le viscoelastic fluid ka keketseho ea mahloriso, empa morphology, rheology le mabaka a susumetsang a cationic cellulose ether ka tharollo ea metsi litlaleho tsa lipatlisiso. Pampiri ena e shebana le boitšoaro ba rheological ba quaternary ammonium modified cellulose aqueous solution, e le ho fana ka tšupiso bakeng sa ts'ebeliso e sebetsang.

1. Karolo ea teko

1.1 Lisebelisoa tse tala

Cationic cellulose ether (KG-30M, JR-30M, LR-30M); Sehlahisoa sa Canada Dow Chemical Company, se fanoeng ke Procter & Gamble Company Kobe R&D Center ea Japane, se lekantsoeng ke Vario EL elemental analyzer (German Elemental Company), sampole The nitrogen content ke 2.7%, 1.8%, 1.0% ka ho latellana (tefiso ea tefiso ke 1.9 Meq/g, 1.25 Meq/g, 0.7 Meq/g ka ho latellana), 'me e lekoa ke Sejeremane ALV-5000E laser light Scattering instrument (LLS) e lekantsoeng boima ba eona ba boima ba molek'hule e ka bang 1.64.×106g / mol.

1.2 Tokiso ea tharollo

Mohlala o ile oa hloekisoa ka ho sefa, dialysis le ho omisa ka leqhoa. Beha boima ba lisampole tse tharo ka ho latellana, 'me u kenye tharollo e tloaelehileng ea buffer e nang le pH 4.00, 6.86, 9.18 ho lokisa mahloriso a hlokahalang. E le ho etsa bonnete ba hore lisampole li qhibililoe ka botlalo, litharollo tsohle tsa sampole li ile tsa behoa holim'a mochini oa khoheli bakeng sa lihora tse 48 pele ho tlhahlobo.

1.3 Tekanyo ea ho hasanya leseli

Sebelisa LLS ho lekanya boima-karolelano ea boima ba molek'hule ea sampole ka tharollo ea metsi a hlapollang, radius ea hydrodynamic le motso o bolelang lisekoere radius ea ho potoloha ha coefficient ea bobeli ea Villi le li-angles tse fapaneng, 'me u nahane hore cationic cellulose ether e ka hare. tharollo e nang le metsi ka boemo ba karo-karolelano ya yona.

1.4 Tekanyo ea viscosity le lipatlisiso tsa rheological

Tharollo e tsepamisitsoeng ea CCE e ile ea ithutoa ke rheometer ea Brookfield RVDV-III+, 'me ho ile ha fuputsoa tšusumetso ea mahloriso, letsoalo la tefiso le boleng ba pH ho thepa ea rheological joalo ka viscosity ea sampole. Libakeng tse phahameng, hoa hlokahala ho batlisisa thixotropy ea eona.

2. Liphetho le lipuisano

2.1 Lipatlisiso mabapi le ho hasana ha Leseli

Ka lebaka la sebopeho sa eona se khethehileng sa limolek'hule, ho thata ho ba teng ka sebōpeho sa molek'hule e le 'ngoe esita le ka solvent e ntle, empa ka mokhoa oa li-micelles tse itseng tse tsitsitseng, lihlopha kapa mekhatlo.

Ha tharollo ea metsi a hlapollang (~ o.1%) ea CCE e bonoa ka microscope ea polarizing, tlas'a semelo sa lebala le letšo la orthogonal, "naleli" e khanyang le mekoallo e khanyang ea hlaha. E boetse e khetholloa ka ho hasana ha leseli, radius ea hydrodynamic ho pH le li-angles tse fapaneng, motso oa "square radius" oa potoloho le coefficient ea bobeli ea Villi e fumanoang ho setšoantšo sa Berry li thathamisitsoe ho Tab. 1. Graph ea kabo ea mosebetsi oa radius ea hydrodynamic e fumanoang mokolokong oa 10-5 haholo-holo tlhōrō e le 'ngoe, empa kabo e pharaletseng haholo (setšoan 1), e bontšang hore ho na le mekhatlo ea limolek'hule le likarolo tse kholo tsamaisong. ; Ho na le liphetoho, 'me litekanyetso tsa Rg / Rb li pota-potile 0.775, e leng se bontšang hore sebopeho sa CCE ka tharollo se haufi le spherical, empa ha se kamehla se lekaneng. Phello ea pH ho Rb le Rg ha e bonahale. The counterion ho buffer solution e sebelisana le CCE ho sireletsa tefiso ka lehlakoreng la ketane ea eona le ho e etsa hore e fokotsehe, empa phapang e fapana ho ea ka mofuta oa counter. Tekanyo ea ho hasanya khanya ea li-polymer tse qosoang e ka ba le tšebelisano ea nako e telele le tšitiso ea kantle, ka hona ho na le liphoso le mefokolo e itseng ho sebopeho sa LLS. Ha karolo ea boima e le kholo ho feta 0.02%, ho na le litlhōrō tse peli tse ke keng tsa aroloa kapa litlhōrō tse ngata ho setšoantšo sa kabo ea Rh. Ha mahloriso a ntse a eketseha, Rh e boetse ea eketseha, e bontšang hore li-macromolecules tse ngata li amahanngoa kapa li kopantsoe. Ha Cao et al. e sebelisitse ho hasanya ha leseli ho ithuta copolymer ea carboxymethyl cellulose le macromers a sebetsang ka holim'a metsi, ho ne ho boetse ho e-na le litlhōrō tse peli tse ke keng tsa aroloa, e 'ngoe ea tsona e neng e le pakeng tsa 30nm le 100nm, e emelang ho thehoa ha li-micelles boemong ba molek'hule,' me e 'ngoe The tlhoro ea Rh e batla e lekana. e kholo, e nkoang e le kakaretso, e tšoanang le liphello tse boletsoeng pampiring ena.

2.2 Lipatlisiso mabapi le boitšoaro ba rheological

2.2.1 Phello ea ho tsepamisa maikutlo:Lekanya li-viscosity tse hlakileng tsa tharollo ea KG-30M ka likhakanyo tse fapaneng ka litekanyetso tse fapaneng tsa ho kuta, le ho ea ka mofuta oa logarithmic oa equation ea molao oa matla o hlahisitsoeng ke Ostwald-Dewaele, ha karoloana ea boima e sa fete 0.7% , le letoto la mela e otlolohileng. ka li-coefficients tsa khokahano tse kholo ho feta 0.99 li fumanoe. 'Me ha mahloriso a ntse a eketseha, boleng ba motsoako oa Newton n bo fokotseha (kaofela ka tlase ho 1), ho bontša mokelikeli o hlakileng oa pseudoplastic. E khannoa ke matla a ho kuta, liketane tsa macromolecular li qala ho phutholoha le ho leba, kahoo viscosity ea fokotseha. Ha karolo ea boima e le kholo ho feta 0.7%, coefficient ea ho hokahanya ha mela ea mohala o otlolohileng o fokotseha (hoo e ka bang 0.98), 'me n e qala ho fetoha kapa ho phahama ka ho eketseha ha mahloriso; ha karolo ea boima e fihla ho 3% (setšoantšo sa 2), tafole The viscosity e bonahalang e qala ho eketseha ebe e fokotseha ka ho eketseha ha sekhahla sa ho kuta. Letoto lena la liketsahalo le fapane le litlaleho tsa litharollo tse ling tsa anionic le cationic polymer. Thepa ea n e ea phahama, ke hore, thepa eo e seng ea Newtonian e ea fokola; Mokelikeli oa Newtonian ke mokelikeli oa viscous, 'me ho thella ha intermolecular ho etsahala tlas'a ketso ea khatello ea moriri,' me e ke ke ea tsosolosoa; Mokelikeli oo e seng oa Newtonian o na le karolo ea rekere e ka khutlisoang le karolo ea viscous e sa boeleng. Tlas'a ketso ea khatello ea ho kuta, ho thella ho ke keng ha thijoa pakeng tsa limolek'hule ho etsahala, 'me ka nako e ts'oanang, hobane li-macromolecules li otlolohile' me li lebisitsoe ka ho kuta, ho thehoa karolo e ka tsosolosoa ea elastic. Ha matla a ka ntle a tlosoa, li-macromolecules li atisa ho khutlela sebopeho sa pele se kobehileng, kahoo Theko ea n e nyoloha. Ho tsepamisa mohopolo ho tsoela pele ho eketseha ho theha mohaho oa marang-rang. Ha khatello ea ho kuta e le nyane, e ke ke ea senngoa, 'me ho tla etsahala feela deformation elastic. Ka nako ena, elasticity e tla ntlafatsoa ka mokhoa o itekanetseng, viscosity e tla fokola, 'me boleng ba n bo tla fokotseha; ha khatello ea ho kuta e ntse e eketseha butle-butle nakong ea tekanyo ea tekanyo, kahoo n Theko ea fetoha. Ha karoloana ea boima e fihla ho 3%, ponahalo ea viscosity e bonahalang e qala ho eketseha ebe e fokotseha, hobane sekoti se senyenyane se khothalletsa ho thulana ha li-macromolecules ho theha lihlopha tse kholo, kahoo viscosity e phahama, 'me khatello ea ho kuta e ntse e tsoela pele ho senya lihlopha. , viscosity e tla fokotseha hape.

Phuputsong ea thixotropy, beha lebelo (r/min) ho fihla ho y e lakatsehang, eketsa lebelo ka nako e tloaelehileng ho fihlela e fihla ho boleng bo behiloeng, ebe o theoha ka potlako ho tloha lebelo le phahameng ho khutlela boleng ba pele ho fumana se tšoanang. Khatello ea ho kuta, kamano ea eona le sekhahla sa ho kuta e bontšoa setšoantšong sa 3. Ha karoloana ea boima e le ka tlase ho 2.5%, lekhalo le holimo le le tlaase li kopana ka ho feletseng, empa ha karoloana ea boima e le 3%, mela e 'meli ha e eo. nako e telele e kopana, 'me mola o theohelang o salla morao, o bontšang thixotropy.

Ho itšetleha ka nako ea khatello ea ho kuta ho tsejoa e le khanyetso ea rheological. Rheological resistance ke boits'oaro bo ikhethileng ba lino tse tahang tsa viscoelastic le lino tse nang le meaho ea thixotropic. Ho fumanoa hore e kholoanyane y e karolong e le 'ngoe ea boima, ka potlako r e fihla tekano,' me ho itšetleha ha nako ho nyenyane; karolong e tlaase ea boima (<2%), CCE ha e bontše khanyetso ea rheological. Ha karolo ea boima e eketseha ho 2.5%, e bontša nako e matla ea ho itšetleha ka nako (setšoantšo sa 4), 'me ho nka metsotso e ka bang 10 ho finyella tekano, ha 3.0%, nako ea tekano e nka metsotso e 50. The thixotropy e ntle ea tsamaiso e na le ts'ebeliso e sebetsang e sebetsang.

2.2.2 Phello ea tefiso ea tefiso:ho khethoa mofuta oa logarithmic oa Spencer-Dillon empirical formula, moo viscosity e sehiloeng ka zero, b e lulang e le boemong bo tšoanang le mocheso o fapaneng, 'me e eketseha ka ho eketseha ha mahloriso ka mocheso o tšoanang. Ho ea ka equation ea molao oa matla e amohetsoeng ke Onogi ka 1966, M ke boima ba limolek'hule tse amanang le polymer, A le B ke li-constants, 'me c ke karolo ea boima (%). feie.5 Li-curve tse tharo li na le lintlha tse hlakileng tsa inflection ho pota 0.6%, ke hore, ho na le karoloana ea boima ba bohlokoa. Ho feta 0.6%, viscosity ea zero-shear e eketseha ka potlako ka keketseho ea mahloriso C. Likhahla tsa mehlala e meraro e nang le likhahla tse fapaneng tsa tefiso li haufi haholo. Ka lehlakoreng le leng, ha karoloana ea boima e pakeng tsa 0.2% le 0.8%, viscosity ea zero-cut ea sampole ea LR e nang le tefiso e nyane ka ho fetisisa ke eona e kholo ka ho fetisisa, hobane mokhatlo oa hydrogen bond o hloka ho kopana ho itseng. Ka hona, tefiso ea tefiso e amana haufi-ufi le hore na li-macromolecules li ka hlophisoa ka mokhoa o hlophisehileng le o kopanetsoeng; ka tlhahlobo ea DSC, ho fumanoa hore LR e na le tlhoro e fokolang ea crystallization, e bonts'ang tefiso e loketseng ea tefiso, 'me viscosity ea zero-shear e phahame maemong a tšoanang. Ha karoloana ea boima e le ka tlase ho 0.2%, LR ke eona e nyenyane ka ho fetisisa, hobane ka tharollo ea dilute, li-macromolecules tse nang le tefiso e tlaase li na le monyetla oa ho etsa li-coil orientation, kahoo viscosity ea zero-shear e tlaase. Sena se na le moelelo o motle oa tataiso mabapi le ts'ebetso e teteaneng.

2.2.3 pH phello: Setšoantšo sa 6 ke sephetho se lekantsoeng ka pH e fapaneng ka har'a mefuta e mengata ea 0.05% ho ea ho 2.5%. Ho na le ntlha ea inflection e pota-potileng 0.45%, empa li-curve tse tharo li batla li kopana, tse bontšang hore pH ha e na phello e hlakileng ho zero-shear viscosity, e fapaneng haholo le kutloisiso ea anionic cellulose ether ho pH.

3. Qetello

The KG-30M dilute aqueous solution e ithutoa ke LLS, 'me kabo ea radius ea hydrodynamic e fumanoeng ke tlhoro e le' ngoe. Ho tloha karo-karolelano ea ho itšetleha ka angle le Rg/Rb, ho ka boleloa hore sebopeho sa eona se haufi le chitja, empa ha se tloaelehe ka ho lekaneng. Bakeng sa tharollo ea CCE e nang le likhahla tse tharo tsa tefiso, viscosity e eketseha ka ho eketseha ha mahloriso, empa palo ea ho tsoma ea Newton n e qala ho fokotseha, ebe e fetoha ebile e phahama; pH ha e na phello e nyane ho viscosity, 'me tefiso e leka-lekaneng ea tefiso e ka fumana viscosity e phahameng.