Te tango i te cellulose huakita hei rauemi mata, whakahiatohia te 2-hydroxy-3-sulfate propyate cellulose ether.Ka tātarihia e te spectrometer infrared te hanganga hua.Ko nga tikanga tino pai mo te whakahiato o te etera cellulose huakita.Ko nga hua i whakaatu ko te kaha whakawhiti o te 2-hydroxy-3-sulfonic acid-based propyate bacterial ether synthesized i raro i nga tikanga arotautanga ko 0.481mmol / g.
Kupumatua: cellulose huakita;2-hydroxyl-3-sulfonic acid-based gornemine cellulose ether;kaha whakawhiti
He rite te cellulose huakita microbial ki te tipu cellulose i roto i te hanganga matū me te hanganga ngota.He polysaccharide tika e hono ana e D-pyrarot glucose kiβ-1, 4-glycoside here.Ka whakatauritea ki te tipu cellulose, he pai ake te ahua o te cellulose huakita.He kupenga muka ultra -micro i tito mai i nga muka ultra -micro.Kei te ahua o te cellulose parakore me te maha o nga mahi ahurei.Ko nga ahuatanga o nga taputapu oro me te keri hinu kua whakamahia nuitia.
Ko te 2-hydroxyl-3-sulfonate cellular cellulose ether he pärönaki nui o te cellulose ka taea te hanga mai i nga rauemi whakauru wai nui.Ka taea hoki te whakamahi hei parakore totoka mo te whakauru o nga katote whakarewa taumaha me te pūmua hei cation.Feng Qingqin, Jie Zhefeng me etahi atu cellulose e whakamahia ana i roto i te kakau witi raihi anga ki te whakarite i te 2-hydroxyl-3-sulfate cellulose ether te whakawhitinga waikawa cationic kaha.Ka whakamahia e tenei tuhinga te cellulose huakita hei rauemi mata, te whakahiato i te 2-hydroxyl-3-sulfonic acid-based cellulose cellulose ether, me te whakamahi i nga whakamatautau orthogonal ki te ako i ona ahuatanga pai rawa atu me te 2-hydroxyl-3-sulfa-sulfa sulfa kua whakaritea i raro i tenei ahuatanga.Ko te kaha whakawhiti o te gornemine cellulose ether e ahu mai ana i te waikawa e whakarato ana i te kaupapa ariā mo te tino tono o te rauemi.
1. Wāhanga whakamātautau
1.1 Reagents me nga taputapu
Te cellulose huakita (hangaia ake), te konutai waiwaro, te konutai warowaiha, te konutai bisulfite, te dioxane, te epichlorohydrin, te acetone, te ewaro, te konutai warowaiha, ko nga reagents i runga ake nei he tohu tātari.
Pouaka incubator / whakamaroke (Shanghai-Heng Technology Co., Ltd.);GQF-1 jet mira (Powder Center, Nanjing University of Science and Technology);Fourier infrared spectrometer (Germany);Agilent AAS-3510 atomic absorption spectrophotometer.
1.2 Whakaritenga o te 2-hydroxy-3-sulfopropyl cellulose ether huakita
1.2.1 Te whakahiatotanga o te cellulose huakita honohono-whiti
Tāpirihia he 10 karamu o te paura cellulose huakita, 60mL o te epichlorohydrin me te 125mL o te 2mol·Ko te wairewa L-1 NaOH ki roto i te ipu kaki-toru kua oti te whakauru ki te kaitao rewharewha me te whakakorikori, te wera ki te reflux mo te 1h, te tātari, me te horoi-whiti ki te acetone me te wai ki nga ahuatanga reo, ka whakamaroke i raro i te korehau i te 60°C ki te whiwhi cellulose huakita honohono-whiti.
1.2.2 Te whakahiato o te konutai 3-chloro-2 hydroxypropanesulfonate
Paunatia te 104.0gNaHSO3 ka memeha ki te 200mLH2O, ka kuhu ki te hau SO2.Te wera ki te 70-90°C me te whakakorikori, katahi ka tapirihia te 160mL epichlorohydrin me te hohenga whakaheke, ka tauhohe i te 85°C mo te 4 haora.I whakamataohia te hua tauhohenga ki raro iho i te 5°C ki te whakamaroke i te hua, katahi ka tātarihia te momi, ka horoi, ka whakamaroke kia puta he hua kowhai kowhai.I rerystallized te hua masivesivá ki te waihā 1:1 kia whiwhi tioata ma.
1.2.3 Te whakahiatotanga o te 2-hydroxy-3-sulfopropyl cellulose ether huakita
Tāpirihia te 2 g o te cellulose huakita hono-whakawhiti, he nui o te 3-chloro-2-hydroxypropanesulfonate, 0.7 g konutai warowaihā, me te 70 mL o te wairewa wai dioxane ki roto i te ipu kaki-toru e mau ana ki te whakakorikori reflux me te whakaohooho, hauota I raro i te whakamarumarutanga, whakahaere i tetahi pāmahana me te whakaoho kia tauhohe mo tetahi wa roa, tātari, horoi ki te acetone me te wai kia noho kore, ka maroke marua i te 60°C ki te whiwhi totoka kowhai marama.
1.3 Te tātari hanganga hua
Whakamātautau FT-IR: papa toka KBr, awhe whakamātautau: 500cm-1～4000cm-1.
1.4 Te whakatau i te kaha whakawhiti
Tangohia te 1-2g o te 2-hydroxy-3-sulfopropyl bacterial cellulose ether, tāpirihia te nui o te wai māturu kia rukuhia, katahi ka ringihia ki roto i te pou whakawhiti me te whakaoho, ka horoi ki te nui o te wai maturu, ka whakamahi i te 100mL 5% Horoihia te waikawa waikawa, whakahaere i te rere o te 3mL ia meneti.Katahi ka horoi ki te wai maturu kia kore ra ano e kitea te kawatanga ina whakamatauria e te methyl karaka, katahi ka rewa ki te 60mL o te konutai pūhaumāota me te kukū o te 1mol L-1, ka whakahaere i te rere o te rere ki te 3mL/meneti, ka kohia te paru ki te Te pounamu Erlenmeyer.Kātahi ka horoi i te tīwae ki te 50-80mL wai māturu.Ko te wairewa kua kohia ka titrated ki te 0.1mol·L-1 konutai konutai wairewa paerewa e whakamahi ana i te phenolphthalein hei tohu, a ko te maha o nga mirimiri o te konutai waikawa i pau ko VNaOH.
2. Nga hua me te matapaki
2.1 Te tohu hanganga o te cellulose huakita honohono-whiti
Na te whakaurunga o C—H, he 2922.98cm-1 te cellulose huakita honohono-whiti.Ko te wiri totoro o C—Ko te H i runga i te mowhiti huka ka whakanikonikohia, ka ngoikore te ahua o nga tihi absorption o nga roopu hydroxyl i te 1161.76cm-1 me te 1061.58cm-1 o te raina spectral a, koinei nga ahuatanga o nga tihi absorption o nga roopu hydroxyl i roto i te cellulose.I te 3433.2cm-1, kei te noho tonu te tihi whakauru wiri o te roopu hydroxyl e pa ana, engari ka heke iho te kaha o te whanaungatanga, e tohu ana kaore ano te roopu hydroxyl i runga i te mowhiti glucoside i tino whakakapi.
2.2 Te tohu hanganga o te konutai 3-chloro-2-hydroxypropanesulfonate
3525～Ko te 3481cm-1 te wiri totoro o te hononga hydroxyl O—H here, 2930.96cm-1 ko te wiri totoro hangarite o C—H, 2852.69cm te wiri totoro hangarite o C—H, 1227.3cm-1, 1054. Ko te 95cm-1 te wiri totoro o S=O, ko te 810.1cm-1 te wiri totoro o COS, ko te 727.4cm-1 te wiri totoro o C—Cl, e tohu ana kua hanga te hua i whäia.
2.3 Te tohu hanganga o te 2-hydroxy-3-sulfopropyl cellulose ether huakita
3431cm-1 ko te OH totoro wiri tihi, 2917cm-1 ko te kukū CH totoro wiri tihi, 1656cm-1 ko te CC totoro wiri tihi, 1212~1020cm-1 he -SO2-antisymmetric me hangarite totoro wiri-1 ko te 658cm te SO here totoro wiri.
2.4 Te arotautanga o nga tikanga whakahiato mo te 2-hydroxy-3-sulfopropyl cellulose ether huakita
I roto i te whakamatautau, i whakamahia te kaha whakawhiti ki te whakamatautau i te kounga o te 2-hydroxy-3-sulfopropyl bacterial cellulose ether.Ko te nui o te konutai 3-chloro-2 hydroxypropanesulfonate i tāpirihia ki te tauhohenga, te kukū o te wairewa wai dioxane, te wa tauhohenga me te pāmahana kua mahia e wha nga mea me nga taumata e toru o nga whakamatautau orthogonal hei tātari i te paanga o ia mea ki te xanthate cellulose kitakita. .Te awenga o nga ahuatanga ester.
Ko nga whakamatautau Orthogonal e whakaatu ana ko te huinga tino pai o nga mea e 4 ko A2B1C3D.1 Ko te tātaritanga awhe e whakaatu ana ko te pāmahana tauhohenga he tino awe ki te mahi adsorption o te 2-hydroxy-3-sulfopropyl cellulose ether, a ko te awhe ko te 1. 914, ka whai i te kukū o te wa, te dioxane, me te nui o te kai o te 3 -chloro-2 konutai hydroxypropanesulfonate.Ko te kaha whakawhiti o te 2-hydroxy-3-sulfopropyl bacterial cellulose ether i whakaritea i raro i nga tikanga tino arotau ko 0.481mmol/g, he teitei ake i tera o nga momo SE-momo cellulose kaha nga rakau whakawhiti katote waikawa kaha i korerotia i roto i te pukapuka.
3. Whakamutunga
Na roto i te whakarereke i te cellulose kitakita, 2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether i whakahiatotia, a ka tohuhia tona hanganga me te ine i tona kaha whakawhiti.Ko nga whakatau e whai ake nei: 1) 2-hydroxy-3 – Ko nga tikanga tukanga tino pai mo te whakahiato o te sulfopropyl bacterial cellulose ether ko: 2g cellulose huakita honohono-whiti, 3.5g 3-chloro-2-hydroxypropanesulfonate konutai, 0.7g konutai warowaihā. me te 7OmI30% dioxane Wairewa wai, tauhohenga i te 70°C i raro i te tiaki hauota mo te 1h, ko te 2-hydroxy-3-sulfonic acid propyl bacterial cellulose ether kua oti te whakarite i raro i tenei ahuatanga he kaha ake te whakawhiti;2) Rōpū waikawa 2-hydroxy-3-sulfonic Ko te kaha whakawhiti o te propyl bacterial cellulose ether he teitei ake i tera o te momo SE rite cellulose te kapia whakawhiti katote waikawa kaha e whakaatuhia ana i roto i te pukapuka.
Wā tuku: Maehe-06-2023