Conformation uye Chimiro cheHydroxyethyl Cellulose

Hydroxyethyl cellulose(HEC) imodified cellulose ether inotorwa kubva ku cellulose kuburikidza nekemikari reaction inounza mapoka ehydroxyethyl muchimiro che cellulose. Iko kuumbwa uye chimiro cheHEC chinopesvedzerwa nedhigirii rekutsiva (DS), uremu hwemamorekuru, uye kurongeka kwemapoka ehydroxyethyl pamwe neketani ye cellulose.

Mapoinzi Akakosha nezve Kugadziriswa uye Chimiro cheHEC:

1. Basic Cellulose Structure:
   • Cellulose is linear polysaccharide inosanganisira kudzokorora mayunitsi eglucose akabatanidzwa ne β-1,4-glycosidic bonds. Iyo inongoitika polima inowanikwa mumasero madziro emiti.
2. Nhanganyaya yeHydroxyethyl Mapoka:
   • Mukuumbwa kweHEC, mapoka ehydroxyethyl anounzwa nekutsiva hydroxyl (-OH) mapoka eiyo cellulose chimiro ne hydroxyethyl (-OCH2CH2OH) mapoka.
3. Dhigirii reKutsiva (DS):
   • Iyo dhigirii yekutsiva (DS) inomiririra avhareji nhamba yemapoka ehydroxyethyl pane anhydroglucose unit mucheni ye cellulose. Iyo yakakosha parameter inokanganisa kunyungudika kwemvura, viscosity, uye zvimwe zvinhu zveHEC. DS yepamusoro inoratidza mwero wepamusoro wekutsiva.
4. Molecular Weight:
   • Huremu hwemamorekuru hweHEC hunosiyana zvichienderana nemaitiro ekugadzira uye chikumbiro chaunoda. Magiredhi akasiyana eHEC anogona kunge aine uremu hwakasiyana hwemamorekuru, achipesvedzera rheological properties.
5. Conformation in Solution:
   • Mumhinduro, HEC inoratidza yakawedzera conformation. Iko kuunzwa kwemapoka e-hydroxyethyl inopa kunyungudika kwemvura kune iyo polymer, ichiibvumira kuti igadzire mhinduro dzakajeka uye dzakajeka mumvura.
6. Kunyungudika kwemvura:
   • HEC inonyungudika nemvura, uye mapoka ehydroxyethyl anobatsira mukunyungudika kwayo kunyungudika kana ichienzaniswa neyemuno selulosi. Kunyungudika uku chinhu chakakosha mukushandisa senge machira, zvinonamira, uye zvigadzirwa zvekuchengeta munhu.
7. Hydrogen Bonding:
   • Kuvapo kwemapoka e-hydroxyethyl pamwe chete neketani ye cellulose inobvumira kupindirana kwehydrogen bonding, ichikurudzira chimiro chese uye maitiro eHEC mumhinduro.
8. Rheological Properties:
   • Iyo rheological properties yeHEC, yakadai seviscosity uye shear-kuonda maitiro, inotungamirirwa nezvose zviri zviviri mamolecular uremu uye chiyero chekutsiva. HEC inozivikanwa neayo inoshanda thickening zvivakwa mumashandisirwo akasiyana siyana.
9. Mafirimu-Kuumba Properties:
   • Mamwe mamakisi eHEC ane zvimiro zvekugadzira firimu, zvichibatsira mukushandiswa kwavo mumachira uko kuumbwa kweinoenderera uye yunifomu firimu kunodiwa.
10. Temperature Sensitivity:
    • Mamwe mamakisi eHEC anogona kuratidza tembiricha senitivity, achichinja mune viscosity kana gelation mukupindura kusiyanisa kwekushisa.
11. Mashandisirwo-Yakasiyana Kusiyana:
    • Vagadziri vakasiyana vanogona kugadzira misiyano yeHEC ine zvivakwa zvakagadzirirwa kusangana nezvinodiwa zvekushandisa.

Muchidimbu, Hydroxyethyl Cellulose (HEC) is water-soluble cellulose ether ine yakawedzera conformation mumhinduro. Kuunzwa kwemapoka e-hydroxyethyl kunowedzera kunyungudika kwayo kwemvura uye kunokanganisa rheological uye firimu-kuumba zvimiro, zvichiita kuti ive polymer inoshanda zvakasiyana-siyana zvekushandisa kwakasiyana mumaindasitiri akadai semajasi, anonamira, kuchengetwa kwemunhu, nezvimwe. Iyo chaiyo conformation uye chimiro cheHEC inogona kunyatsogadziriswa zvichienderana nezvinhu zvakaita sedhigirii rekutsiva uye uremu hwemamorekuru.