Aveina le cellulose siama e fai ma mea mata, fa'apipi'i le 2-hydroxy-3-sulfate propyate cellulose ether.E su'esu'e e le spectrometer infrared le fausaga o oloa.Tulaga sili ona lelei mo le tu'ufa'atasiga o le ether cellulose siama.O fa'ai'uga na fa'aalia ai o le gafatia fa'afesuia'i o le 2-hydroxy-3-sulfonic acid-based propyate bacterial ether fa'apipi'iina i lalo o tulaga fa'apitoa e 0.481mmol / g.
upu autu: cellulose siama;2-hydroxyl-3-sulfonic acid-fa'avae gornemine cellulose ether;mafai ona fesuiai
Microbial synthetic bacterial cellulose e tutusa ma le cellulose o la'au ile vaila'au ma le fausaga mole.O se polysaccharide sa'o e feso'ota'i e le D-pyrarot glucose maβ-1, 4-glycoside fusi.Pe a faatusatusa i le cellulose laau, o le cellulose siama e sili atu lona uiga.O se upega ultra-micro fiber e aofia ai alava ultra-micro.O loʻo i ai i foliga o le cellulose mama ma e tele ana galuega faʻapitoa.O vaega o masini faʻalogo ma le suauʻu suauʻu ua faʻaaogaina lautele.
2-hydroxyl-3-sulfonate cellular cellulose ether o se mea taua e maua mai i le cellulose lea e mafai ona faia i mea maualuga e faʻafefe ai le vai.E mafai foi ona faʻaaogaina e avea o se mama mautu mo le adsorption o ion uʻamea mamafa ma porotini o se cation.Feng Qingqin, Jie Zhefeng ma isi cellulose faʻaaogaina i atigi araisa vaomago sana e saunia 2-hydroxyl-3-sulfate cellulose ether malosi acid cationic fesuiaiga.O lenei tusiga o loʻo faʻaogaina ai le cellulose siama e fai ma mea mata, faʻapipiʻi le 2-hydroxyl-3-sulfonic acid-based bacterial cellulose ether, ma faʻaogaina suʻega faʻasolosolo e suʻesuʻe ai ona tulaga sili ona lelei ma le 2-hydroxyl-3-sulfa-sulfa sulfa ua saunia i lalo o lenei tulaga.O le fesuiaiga o gafatia o le acid-based gornemine cellulose ether e maua ai le faavae faʻavae mo le faʻaogaina moni o mea.
1. Vaega faataitai
1.1 Reagents ma meafaigaluega
Bacterial cellulose (faia e le tagata lava ia), sodium hydroxide, sodium carbonate, sodium bisulfite, dioxane, epichlorohydrin, acetone, ethanol, sodium carbonate, o mea o loʻo i luga o loʻo i luga o le vasega auʻiliʻili.
Pusa incubator / faʻamago (Shanghai-Heng Technology Co., Ltd.);GQF-1 jet mill (Powder Center, Nanjing University of Science and Technology);Fourier infrared spectrometer (Siamani);Agilent AAS-3510 atomic absorption spectrophotometer.
1.2 Sauniuniga ole 2-hydroxy-3-sulfopropyl bacterial cellulose ether
1.2.1 Syntheis o Cross-Liverked Bactarial Cellulose
Faaopopo le 10g o siama cellulose paʻu, 60mL o le epichlorohydrin ma le 125mL o le 2mol.·L-1 NaOH vaifofo i totonu o se fagu e tolu-ua ua faʻapipiʻiina i se faʻafefete faʻafefe ma se faʻafefeteina, vevela e faʻafefe mo le 1h, faʻamama, ma faʻafefeteina i le acetone ma le vai i mea feololo, ma faʻagogo i lalo ole vacuum ile 60°C e maua mai ai selulose siama fa'afeso'ota'i.
1.2.2 Fa'asologa o le sodium 3-chloro-2 hydroxypropanesulfonate
Fua le 104.0gNaHSO3 ma fa'amuta i le 200mLH2O, ma tu'u i le kasa SO2.Faʻamafanafana e oʻo i le 70-90°C fa'atasi ma le fa'aoso, ona fa'aopoopo lea o le 160mL epichlorohydrin fa'atasi ai ma se fa'alu pa'u, ma tali i le 85.°C mo le 4h.O le mea e tali atu na fa'amalieina i lalo ole 5°C e fa'a tioata le oloa, ona fa'amama lea, fufulu, ma fa'agogo ina ia maua ai se oloa fa'atau samasama samasama.O le oloa fa'atauva'a na toe fa'a'aisa i le 1:1 ethanol e maua ai tioata pa'epa'e.
1.2.3 Fa'asologa o le 2-hydroxy-3-sulfopropyl bacterial cellulose ether
Faʻaopopo le 2 g o le cellulose siama fesoʻotaʻi fesoʻotaʻi, se aofaʻi o le 3-chloro-2-hydroxypropanesulfonate, 0.7 g o le sodium carbonate, ma le 70 mL o le dioxane vai vai i totonu o se fagu e tolu-ua ua faʻapipiʻiina ma se reflux condenser ma se faʻafefe, nitrogen I lalo o le puipuiga, pulea se vevela patino ma fa'aoso e tali atu mo se vaitaimi patino, faamama, fufulu i le acetone ma le vai i le liliu atu i le neutrality, ma vacuum-mamago i le 60°C e maua ai se lanu samasama mumu.
1.3 Su'esu'ega fausaga o oloa
Su'ega FT-IR: laulau KBr mautu, va'aiga su'ega: 500cm-1～4000cm-1.
1.4 Fuafuaga o le gafatia e fesuiai
Ave le 1-2g o le 2-hydroxy-3-sulfopropyl bacterial cellulose ether, faʻaopopo le aofaʻi talafeagai o vai faʻafefete e faʻafefe, ona sasaa lea i totonu o le koluma fefaʻatauaʻiga ma faʻavevesi, fufulu i le aofaʻi talafeagai o vai faʻafefe, ona faʻaaoga lea pe a ma le 100mL 5% Fufulu vaiinu vai, pulea le tafe ole 3mL ile minute.Ona fufulu lea i le vai fa'amama se'ia le fa'aalia le malosi pe a fa'ata'ita'i i le methyl orange, ona fa'amama lea i le tusa ma le 60mL o le sodium chloride fa'atasi ai ma le maualuga o le 1mol L-1, fa'atonutonu le tafe i le tusa ma le 3mL/min, ma fa'aputu le otaota i se fagu Erlenmeyer.Ona fufulu lea o le koluma ile 50-80mL vai fa'amama.O le vaifofo na aoina na titrated i le 0.1mol·L-1 sodium hydroxide solution standard e fa'aaoga ai le phenolphthalein e fai ma fa'ailo, ma o le aofa'i o mililita o le sodium hydroxide na fa'aaogaina o le VNaOH.
2. I'uga ma talanoaga
2.1 Fa'avasegaga fa'atutusa o sela fa'ama'i pipisi fa'alava
Ona o le faʻalauiloaina o le C—H, o le cellulose siama feso'ota'i e 2922.98cm-1.O le faʻalauteleina o le vibration o C—H i luga o le mama mama ua faʻaleleia, ma o le maualuga absorption uiga o vaega hydroxyl i le 1161.76cm-1 ma le 1061.58cm-1 o le laina spectral a ua vaivai, o le uiga absorption tumutumu o vaega hydroxyl i cellulose.I le 3433.2cm-1, o loʻo i ai pea le maualuga o le vibrational absorption o le vaega o le hydroxyl e fesoʻotaʻi, ae o le faʻaitiitia o le malosi faʻatusatusa, e faʻaalia ai e leʻi suia atoa le vaega o le hydroxyl i luga o le mama glucoside.
2.2 Fa'avasegaina fa'atulagaina o le sodium 3-chloro-2-hydroxypropanesulfonate
3525～3481cm-1 o le faʻalauteleina o le vibration o le fesoʻotaʻiga hydroxyl O—H fa'amau, 2930.96cm-1 o le fa'aliga fa'a'alo'alo a le C—H, 2852.69cm o le simmetrical fa'aloloa vibration o C—H, 1227.3cm-1, 1054. 95cm-1 o le faʻalauteleina o le vibration o S = O, 810.1cm-1 o le faʻalauteleina o le vibration o le COS, ma le 727.4cm-1 o le faʻalauteleina o le vibration o C.—Cl, e faʻaalia ai o loʻo faʻatulagaina le oloa faʻatatau.
2.3 Fa'ailoga fa'atulagaina o le 2-hydroxy-3-sulfopropyl bacterial cellulose ether
3431cm-1 o le OH fa'atuputeleina vibration tumutumu, 2917cm-1 o le tumu CH fa'aloalo tumutumu vibration, 1656cm-1 o le CC fa'alautele vibration tumutumu, 1212 ~ 1020cm-1 o -SO2-antisymmetric ma symmetric fa'aloloa vibration-1 o le 658cm. o le SO fusi fa'alauteleina vibration.
2.4 Fa'amalieina o tulaga fa'apipi'i mo le 2-hydroxy-3-sulfopropyl bacterial cellulose ether
I le faʻataʻitaʻiga, na faʻaaogaina le gafatia o le fesuiaiga e suʻe ai le lelei o le 2-hydroxy-3-sulfopropyl bacterial cellulose ether.Ole aofaʻi ole 3-chloro-2 hydroxypropanesulfonate sodium faʻaopoopo i le tali, ole faʻaogaina ole dioxane aqueous solution, ole taimi faʻaalia ma le vevela ua faia ai mea e fa ma tolu tulaga o suʻega faʻasolosolo e iloilo ai le aʻafiaga o mea taʻitasi i luga o le siama cellulose xanthate. .Aafiaga o meatotino ester.
O suʻesuʻega faʻapitoa e faʻaalia ai o le tuʻufaʻatasiga sili ona lelei o mea e 4 o le A2B1C3D.1 Va'aiga fa'avasegaga o lo'o fa'aalia ai o le vevela o le tali e sili ona a'afia i le fa'atinoina o le adsorption o le 2-hydroxy-3-sulfopropyl cellulose ether, ma le laina o le 1. 914, sosoo ai ma le fa'atonuga o le taimi, dioxane, ma le aofa'i o le fafagaina o le 3. -chloro-2 hydroxypropanesulfonate sodium.O le gafatia o le fesuiaiga o le 2-hydroxy-3-sulfopropyl bacterial cellulose ether na saunia i lalo o tulaga sili ona lelei o le 0.481mmol / g, lea e maualuga atu nai lo le tutusa SE-ituaiga cellulose malosi fa'afesuia'i vaila'au o lo'o lipotia i le tusi lesona.
3. Faaiuga
I le suia o le cellulose siama, 2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether na faʻapipiʻiina, ma o lona fausaga na faʻaalia ma fuaina lona gafatia.O faʻaiʻuga nei na faia: 1) 2-hydroxy-3 - O tulaga sili ona lelei mo le tuʻufaʻatasia o le sulfopropyl bacterial cellulose ether o: 2g cross-linked bacterial cellulose, 3.5g 3-chloro-2-hydroxypropanesulfonate sodium, 0.7g sodium carbonate ma le 7OmI30% dioxane vaifofo vai, tali ile 70°C i lalo o le puipuiga o le nitrogen mo le 1h, o le 2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether saunia i lalo o lenei tulaga o loʻo i ai le maualuga o le fesuiaiga o gafatia;2) 2-hydroxy-3-sulfonic acid group O le gafatia o le fesuiaiga o le propyl bacterial cellulose ether e maualuga atu nai lo le ituaiga SE tutusa cellulose strong acid cation exchange resin lipotia i le tusitaulima.
Taimi meli: Mati-06-2023