Umthelela wedigri ye-substitution (DS) kukhwalithi ye-HEC

I-HEC (i-hydroxyethyl cellulose) iyi-polymer engeyona i-ionic, encibilika emanzini esetshenziswa kabanzi ezimbonini ezahlukahlukene ezifana nokunakekelwa komuntu siqu, ezemithi, nokudla njenge-ejenti ejiyayo, ebophayo, neqinisayo.I-degree of substitution (DS) iyipharamitha ebalulekile engathinta kakhulu izakhiwo nokusebenza kwe-HEC.

Izinga lokushintsha libhekisela enanini eliyisilinganiso lamaqembu e-hydroxyethyl anamathiselwe kuyunithi ngayinye ye-anhydroglucose yomgogodla we-cellulose.Ngamanye amazwi, ikala izinga lapho i-molecule ye-cellulose ishintshwe ngayo ngamaqembu e-hydroxyethyl.

Umthelela wezinga lokushintsha kukhwalithi ye-HEC ubalulekile.Ngokuvamile, njengoba izinga lokushintsha likhula, ukuncibilika kwe-HEC emanzini kuyanda, futhi i-viscosity yayo iyancipha.I-HEC enezinga eliphakeme lokushintsha ine-viscosity ephansi, futhi inyibilika kakhulu emanzini.Lokhu kungenxa yokuthi amaqembu e-hydroxyethyl aphazamisa ukuhlangana kwe-hydrogen phakathi kwamaketanga e-cellulose, okuholela esakhiweni esivuleke kakhudlwana futhi esivumelana nezimo.

Ngaphezu kwalokho, izinga eliphakeme lokufaka esikhundleni lingathuthukisa ukuzinza kokushisa kwe-HEC futhi kwandise ukumelana kwayo nokuwohloka kwe-enzymatic.Kodwa-ke, izinga eliphezulu kakhulu lokufaka esikhundleni lingaholela ekunciphiseni isisindo samangqamuzana nokulahlekelwa izakhiwo zangempela ze-cellulose backbone, ezingathinta ukusebenza okuphelele kwe-HEC.

Kafushane, izinga lokushintsha liyipharamitha ebalulekile engathinta kakhulu izakhiwo nokusebenza kwe-HEC.Izinga eliphakeme lokufaka esikhundleni lingathuthukisa ukuncibilika nokuzinza kokushisa kwe-HEC, kodwa izinga eliphezulu kakhulu lokufaka esikhundleni lingaholela ekulahlekelweni kwezakhiwo zangempela ze-cellulose backbone, ezingathinta ukusebenza okuphelele kwe-HEC.