Mafi mahimmancin siffa ta maganin cellulose ether shine sifar rheological ɗinsa. Sifar rheological ta musamman ta yawancin cellulose ethers tana sa a yi amfani da su sosai a fannoni daban-daban, kuma nazarin sifar rheological yana da amfani ga haɓaka sabbin filayen aikace-aikace ko inganta wasu filayen aikace-aikace. Li Jing daga Jami'ar Jiao Tong ta Shanghai ta gudanar da wani bincike mai tsari kan sifar rheologicalcarboxymethylcellulose (CMC), gami da tasirin sigogin tsarin kwayoyin halitta na CMC (nauyin kwayoyin halitta da matakin maye gurbinsu), pH mai yawa, da ƙarfin ionic. Sakamakon bincike ya nuna cewa sifili-raguwa na maganin yana ƙaruwa tare da ƙaruwar nauyin kwayoyin halitta da matakin maye gurbinsu. Ƙarar nauyin kwayoyin halitta yana nufin haɓakar sarkar kwayoyin halitta, kuma sauƙin haɗawa tsakanin kwayoyin halitta yana ƙara dankowar maganin; babban matakin maye gurbin yana sa kwayoyin halitta su miƙe sosai a cikin maganin. Yanayin yana wanzuwa, girman hydrodynamic yana da girma, kuma dankowar yana girma. Dankowar maganin ruwa na CMC yana ƙaruwa tare da ƙaruwar maida hankali, wanda ke da viscoelasticity. Dankowar maganin yana raguwa tare da ƙimar pH, kuma lokacin da ya ƙasa da wani ƙima, dankowar yana ƙaruwa kaɗan, kuma daga ƙarshe ana samar da acid kyauta kuma ana haƙa shi. CMC polymer ne na polyanionic, lokacin da ake ƙara ions gishiri na monovalent Na+, garkuwar K+, dankowar zai ragu daidai gwargwado. Ƙara divalent cation Caz+ yana sa dankowar maganin ya ragu da farko sannan ya ƙaru. Idan yawan Ca2+ ya fi na stoichiometric girma, ƙwayoyin CMC suna hulɗa da Ca2+, kuma akwai wani babban tsari a cikin maganin. Liang Yaqin, Jami'ar Arewa ta China, da sauransu, sun yi amfani da hanyar viscometer da hanyar viscometer mai juyawa don gudanar da bincike na musamman kan halayen rheological na mafita masu narkewa da mai ƙarfi na hydroxyethyl cellulose (CHEC). Sakamakon binciken ya gano cewa: (1) Cationoluse hydroxyethyl cellulose yana da yanayin polyelectrolyte na yau da kullun a cikin ruwa mai tsabta, kuma raguwar danko yana ƙaruwa tare da ƙaruwar maida hankali. Danko na ciki na cationic hydroxyethyl cellulose tare da babban matakin maye gurbin ya fi na cationic hydroxyethyl cellulose tare da ƙarancin matakin maye gurbin. (2) Maganin cationic hydroxyethyl cellulose yana nuna halayen ruwa mara Newtonian kuma yana da halayen rage saurin yankewa: yayin da yawan taro na maganin ke ƙaruwa, danko na bayyane yana ƙaruwa; a cikin wani adadin maganin gishiri, danko na bayyane na CHEC Yana raguwa tare da ƙaruwar ƙarin yawan gishiri. A ƙarƙashin wannan ƙimar yankewa, bayyanar danko na CHEC a cikin tsarin maganin CaCl2 ya fi na CHEC girma sosai a cikin tsarin maganin NaCl.
Tare da ci gaba da zurfafa bincike da kuma ci gaba da faɗaɗa filayen amfani, halayen mafita na gauraye waɗanda suka ƙunshi ethers cellulose daban-daban suma sun sami kulawar mutane. Misali, ana amfani da sodium carboxymethyl cellulose (NACMC) da hydroxyethyl cellulose (HEC) a matsayin masu fitar da mai a filayen mai, waɗanda ke da fa'idodin juriyar yankewa mai ƙarfi, wadataccen kayan masarufi da ƙarancin gurɓataccen muhalli, amma tasirin amfani da su kaɗai ba shi da kyau. Kodayake na farko yana da kyakkyawan danko, zafin tafki da gishiri yana shafar shi cikin sauƙi; kodayake na ƙarshen yana da kyakkyawan juriyar zafin jiki da gishiri, ƙarfin kauri ba shi da kyau kuma yawan amfani yana da girma. Masu binciken sun haɗa mafita biyu kuma sun gano cewa danko na maganin haɗin ya zama mafi girma, juriyar zafin jiki da juriyar gishiri sun inganta zuwa wani mataki, kuma tasirin aikace-aikacen ya inganta. Verica Sovilj da abokan aikinsa sun yi nazarin halayen rheological na maganin tsarin gauraye wanda ya ƙunshi HPMC da NACMC da anionic surfactant tare da viscometer mai juyawa. Halin tsarin rheological ya dogara ne akan HPMC-NACMC, HPMC-SDS da NACMC- (HPMC-SDS) tasirin daban-daban ya faru tsakanin.
Abubuwan da ke haifar da sinadarin cellulose ether suma suna shafar halayen rheological na mafita na cellulose ether, kamar ƙarin sinadarai, ƙarfin injina na waje da zafin jiki. Tomoaki Hino da sauransu sun yi nazarin tasirin ƙarin nicotine akan halayen rheological na hydroxypropyl methylcellulose. A 25C kuma yawan sinadarin ya yi ƙasa da kashi 3%, HPMC ya nuna halayen ruwan Newtonian. Lokacin da aka ƙara nicotine, ɗanko ya ƙaru, wanda ya nuna cewa nicotine ya ƙara haɗuwaHPMCKwayoyin halitta. A nan Nicotine yana nuna tasirin gishiri wanda ke ɗaga ma'aunin gel da wurin hazo na HPMC. Ƙarfin injina kamar ƙarfin shear suma suna da wani tasiri akan halayen ruwan cellulose ether. Ta amfani da turbidimeter na rheological da ƙaramin kayan aikin watsa haske na kusurwa, an gano cewa a cikin maganin rabin-dilute, yana ƙara yawan shear, saboda haɗa shear, zafin canjin wurin hazo zai ƙaru.
Lokacin Saƙo: Afrilu-28-2024