Cellulose ether yog ib chav kawm ntawm cov dej-soluble polymers muab tau los ntawm cellulose, uas yog lub ntsiab structural tivthaiv ntawm cov nroj tsuag cell phab ntsa. Cellulose ether muaj ntau yam khoom tshwj xeeb, suav nrog kev tuav dej siab, thickening, khi, thiab muaj peev xwm ua zaj duab xis. Cov khoom no ua rau cellulose ether yog cov khoom tseem ceeb hauv ntau cov khoom lag luam, tshuaj, thiab cov khoom tu tus kheej.

Ib qho ntawm cov khoom tseem ceeb ntawm cellulose ether yog nws cov viscosity, uas yog hais txog qhov tsis kam ntawm cov kua dej ntws. Viscosity yog ib qho tseem ceeb uas cuam tshuam rau kev ua haujlwm thiab kev siv cellulose ether hauv ntau yam khoom. Hauv tsab xov xwm no, peb yuav tham txog viscosity ntawm cellulose ether, suav nrog nws qhov ntsuas, yam cuam tshuam rau nws, thiab nws daim ntawv thov hauv ntau qhov kev lag luam.

Kev ntsuas viscosity ntawm Cellulose Ether

Lub viscosity ntawm cellulose ether feem ntau yog ntsuas los ntawm kev siv lub viscometer, uas yog ib qho cuab yeej uas ntsuas tus nqi ntws ntawm cov kua hauv qab ntawm lub ntiajteb txawj nqus lossis lub zog siv. Muaj ntau ntau hom viscometers, suav nrog kev sib hloov, capillary, thiab oscillatory viscometers, txhua tus muaj nws tus kheej zoo thiab kev txwv.

Rotational viscometers yog cov cuab yeej siv feem ntau los ntsuas qhov viscosity ntawm cellulose ether. Cov cuab yeej no ntsuas lub torque yuav tsum tau tig ib tug spindle los yog rotor raus rau hauv cov kua ntawm ib tug tas li ceev. Lub viscosity yog ces xam raws li kev sib raug zoo ntawm lub torque thiab cov kev sib hloov ceev.

Capillary viscometers, ntawm qhov tod tes, ntsuas lub sij hawm xav tau rau lub ntim ruaj khov ntawm cov kua ntws los ntawm lub raj nqaim capillary nyob rau hauv lub zog ntawm lub ntiajteb txawj nqus lossis lub siab gradient. Lub viscosity yog xam raws li Poiseuille txoj cai, uas hais txog tus nqi ntws mus rau lub viscosity, lub raj txoj kab uas hla, thiab lub siab gradient.

Oscillatory viscometers, uas ntsuas qhov deformation thiab rov qab los ntawm cov kua dej nyob rau hauv lub sinusoidal shear stress, yog siv los ntsuas qhov complex viscosity ntawm cellulose ether, uas yog qhov zaus-nyob ntawm viscosity.

Cov yam ntxwv cuam tshuam rau viscosity ntawm Cellulose Ether

Lub viscosity ntawm cellulose ether yog cuam tshuam los ntawm ntau yam, nrog rau nws qhov hnyav molecular, qib ntawm kev hloov, concentration, kub, thiab shear npaum li cas.

Molecular hnyav: Lub viscosity ntawm cellulose ether nce nrog nce molecular hnyav, raws li siab molecular hnyav polymers muaj ntev chains uas entangle nrog ib leeg, ua rau kom muaj zog tiv thaiv ntws.

Degree ntawm kev hloov pauv: Qhov degree ntawm kev hloov pauv (DS) ntawm cellulose ether, uas yog hais txog tus naj npawb ntawm cov pab pawg hydroxyl hloov hauv ib chav tsev piam thaj hauv cov saw cellulose, kuj cuam tshuam rau nws cov viscosity. Raws li DS nce, cov viscosity ntawm cellulose ether nce vim muaj kev sib txuas ntawm cov saw txuas ntxiv thiab kev sib cuam tshuam ntawm kev sib cuam tshuam.

Concentration: Lub viscosity ntawm cellulose ether nce nrog nce concentration, raws li ntau dua concentrations ua rau muaj zog saw entanglement thiab intermolecular kev sib tshuam.

Kub: Lub viscosity ntawm cellulose ether txo qis nrog qhov kub thiab txias, vim tias qhov kub siab dua ua rau muaj zog molecular zog thiab txo cov kev sib cuam tshuam ntawm intermolecular.

Shear npaum li cas: Lub viscosity ntawm cellulose ether kuj yog nyob ntawm cov ntaub ntawv shear npaum li cas, raws li shear tus nqi ntau dua ua rau muaj zog saw alignment thiab txo tsis kam mus ntws.

Kev siv Cellulose Ether hauv ntau yam kev lag luam

Cellulose ether yog siv dav hauv ntau lub lag luam vim nws cov khoom tshwj xeeb, nrog rau nws cov viscosity. Qee qhov kev siv tseem ceeb ntawm cellulose ether hauv kev lag luam sib txawv tau tham hauv qab no.

Kev tsim kho: Cellulose ether yog siv los ua cov thickener, dej tuav tus neeg sawv cev, thiab khi rau hauv cov khoom siv xws li cement, mortar, thiab gypsum. Nws txhim kho kev ua haujlwm, sib xws, thiab adhesion ntawm cov khoom no, ua rau kev txhim kho kev ua haujlwm thiab kav ntev.

Pharmaceuticals: Cellulose ether yog siv los ua ib qho ntxiv hauv cov tshuaj formulations xws li ntsiav tshuaj, tshuaj ntsiav, thiab cream. Nws txhim kho cov flowability, compressibility, thiab viscosity ntawm cov formulations, ua rau kev txhim kho tshuaj xa thiab stability.