Izifundo ze-Rheological of Hydroxypropyllylylylyl (HPMC) zibalulekile ekuqondeni ngokuziphatha kwazo kuzicelo ezahlukahlukene, ezisukela emikhakheni emikhakheni kuya kokudla nezimonyo. I-HPMC iyi-cellulose ether ehlelwa kabanzi njenge-ejenti ekhuthele, i-stabilizer, ne-emulsifier ngenxa yekhono layo lokuguqula izakhiwo zesinqumo sezisombululo kanye nokumiswa.
Izilinganiso zokulinganisa:
I-Viscosity ingesinye sezinto ezibaluleke kakhulu ze-bheloological afundwe ezinhlelweni ze-HPMC. Amasu ahlukahlukene anjenge-vischetry ejikelezayo, ama-viscillary vingcompetry, kanye ne-Oscillatory Rhemetry aqashwa ukukala ukubonakala.
Lezi zifundo zicacisa umphumela wezinto ezinjenge-HPMC Ukuhlushwa, isisindo samangqamuzana, izinga lokufaka esikhundleni, izinga lokushisa, kanye nesilinganiso se-vear ekuboneni.
Ukuqonda kwe-Viscosity kubalulekile njengoba kunquma ukusebenza kokugeleza, ukuqina kanye nokufaneleka kohlelo lokusebenza lwezinhlelo ze-HPMC ezigqinsiwe.
Ukuziphatha okunciphisayo:
Izixazululo ze-HPMC zivame ukukhombisa ukuziphatha okunciphisayo kokuncipha, okusho ukuthi ukubonakala kwawo kunciphisa ngezinga elikhulayo le-shear.
Izifundo ze-Rheological ziyehlela ekunciphiseni ukuncipha nokuncika kwaso ezintweni ezinjenge-polymer ukugxila kanye nokushisa.
Ukuhlukumezeka kokuncipha kwe-shear-ukuthambisa kubalulekile ukuze kusetshenziswe izinhlelo ezinjengezimbali kanye nama-adhesives, lapho ukugeleza ngesikhathi sokufaka isicelo nokuqina ngemuva kwesicelo kubalulekile.
I-3.Thixetropy:
I-Thixotropy isho ukululama okuncike isikhathi sokuvuleka ngemuva kokususwa kwengcindezi ye-shear. Amasistimu amaningi we-HPMC abonisa indlela yokuziphatha e-Thixotropic, ezuzisa izinhlelo zokusebenza ezidinga ukugeleza okulawulwayo nokuqina.
Izifundo ze-Rheological zibandakanya ukulinganisa ukululama kokubona ngokuhamba kwesikhathi ngemuva kokufaka uhlelo lokuthola ukucindezela kwengcindezi.
Ukuqonda izinsiza ze-Thixotropy ekwakheni imikhiqizo enjenge-Paints, lapho ukuqina ngesikhathi sokugcina nokukhululeka kwesicelo kubalulekile.
I-4.Gelation:
Ekugxilisweni okuphezulu noma ngezithasiselo ezithile, izixazululo ze-HPMC zingabhekana ne-gelisation, zakha isakhiwo senethiwekhi.
Izifundo ze-Rheological ziphenya ngokuziphatha kwe-gelation maqondana nezici ezifana nokuhlushwa, izinga lokushisa kanye ne-pH.
Izifundo ze-gelation zibalulekile ekwakheni ukwakhiwa kwezidakamizwa okulondolozwe okuqhubekayo nokwakha imikhiqizo ezinzile ye-gel-based ekudleni nasezimbonini zokunakekelwa komuntu.
Isimo esingu-5.Structural:
Amasu anjenge-X-ray engela ama-X-ray asakaze (ama-sax) kanye nama-bheo-satha ahlinzeka ngemininingwane kwi-miscrumples ye-HPMC.
Lezi zifundo ziveza imininingwane nge-polymer chain conformation, indlela yokuziphatha ehlanganisiwe, nokusebenzisana nama-solecule e-solvent.
Ukuqonda izici zesakhiwo kuyasiza ekubikezeleni ekubikezeleni kwe-macroscopic healcological ukusebenza kanye nokwenza kahle ukwakhiwa kwezindawo ezifiselekayo.
Ukuhlaziywa kwemishini engu-6.Dynamic (DMA):
I-DMA ikala izakhiwo ze-viscoelastic zezinto zokwakha ngaphansi kwe-oscillatory deformation.
Izifundo ze-Rheological zisebenzisa amapharamitha we-DMA afana ne-modulus yokugcina (g '), ukulahleka modulus (g "), kanye nokubonakaliswa okuyinkimbinkimbi njengomsebenzi wemvamisa kanye lokushisa.
I-DMA ilusizo ikakhulukazi ekuziphatheni okufana nokufana okufana noketshezi kwama-hpmc ama-hpmc nama-pastes.
7.Izifundo ezikhethekile -
Izifundo ze-Rheological zihambisana nezinhlelo ezithile ezifana namathebulethi wezemithi, lapho kusetshenziswa khona i-HPMC njenge-binder, noma emikhiqizweni yokudla efana nososo nokugqoka, lapho isebenza khona njengesikhulu ne-stabilizer.
Lezi zifundo zithuthukisa ukwakhiwa kwe-HPMC yezakhiwo ezifiselekayo zokugeleza, ukuthungwa, kanye nokuqina kweshalofu, ukuqinisekisa ukusebenza komkhiqizo kanye nokwamukelwa kwabathengi.
Izifundo ze-Rheological zidlala indima ebalulekile ekuqondeni ukuziphatha okuyinkimbinkimbi kwezinhlelo ze-HPMC Femperer. Ngokuqonda okuqondayo, i-shear-incane, i-thixotropy, i-gelalop, izici ezihlelekile, kanye nezinto ezikhethekile zohlelo lokusebenza, lezi zifundo zenza lula ukwakheka kwe-HPMC kuzo zonke izimboni ezahlukahlukene.
Isikhathi sePosi: Meyi-10-2024