Rheological zvidzidzo zveHydroxypropyl Methylcellulose (HPMC) thickener masisitimu akakosha pakunzwisisa maitiro avo mumashandisirwo akasiyana siyana, kubva kumishonga kusvika kuchikafu nezvizoro. HPMC is a cellulose ether derivative inoshandiswa zvakanyanya seyakakora mumiriri, stabilizer, uye emulsifier nekuda kwekugona kwayo kugadzirisa rheological maitiro emhinduro uye kumiswa.
1.Viscosity Measurements:
Viscosity ndeimwe yeakanyanya kukosha rheological zvivakwa zvakadzidzwa muHPMC masisitimu. Nzira dzakasiyana dzakadai seyekutenderera viscometry, capillary viscometry, uye oscillatory rheometry dzinoshandiswa kuyera viscosity.
Izvi zvidzidzo zvinojekesa mhedzisiro yezvinhu zvakaita seHPMC kusungwa, huremu hwemamorekuru, dhigirii rekutsiva, tembiricha, uye shear rate pane viscosity.
Kunzwisisa viscosity kwakakosha sezvo ichitarisa mafambiro ekuyerera, kugadzikana, uye kukodzera kwekushandisa kweHPMC yakakora masisitimu.
2.Shear-Kuonda maitiro:
HPMC mhinduro dzinowanzo ratidza shear-kuonda maitiro, zvichireva kuti viscosity yavo inodzikira nekuwedzera shear rate.
Rheological zvidzidzo zvinotarisa pahupamhi hwekuveura-kutetepa uye kutsamira kwahwo pazvinhu zvakaita se polymer kusungwa uye tembiricha.
Hunhu hunoita shear-kuonda kwakakosha kune zvikumbiro zvakaita semajasi uye zvinonamira, uko kuyerera panguva yekushandisa uye kugadzikana mushure mekushandisa kwakakosha.
3.Thixotropy:
Thixotropy inoreva nguva-inotsamira kupora kwe viscosity mushure mekubviswa kweshear stress. Mazhinji HPMC masisitimu anoratidza thixotropic maitiro, ayo anobatsira mumashandisirwo anoda kudzora kuyerera uye kugadzikana.
Zvidzidzo zveRheological zvinosanganisira kuyera kudzoreredzwa kweviscosity nekufamba kwenguva mushure mekuisa iyo sisitimu kushear stress.
Kunzwisisa thixotropy aids mukugadzira zvigadzirwa sependi, uko kugadzikana panguva yekuchengetedza uye nyore kushandisa kwakakosha.
4.Gelation:
Panzvimbo dzepamusoro-soro kana nezvimwe zvekuwedzera, HPMC mhinduro dzinogona kupinda gelation, dzichigadzira network network.
Rheological zvidzidzo zvinoongorora maitiro egelation maererano nezvinhu zvakaita sekutarisa, tembiricha, uye pH.
Zvidzidzo zveGelation zvakakosha pakugadzira magadzirirwo ezvinodhaka anoramba achiburitswa uye kugadzira zvakagadzika gel-based zvigadzirwa mumaindasitiri ezvekudya uye ega ega.
5.Structural Characterization:
Matekinoroji akadai sediki-angle X-ray kuparadzira (SAXS) uye rheo-SAXS inopa nzwisiso mukati meiyo microstructure yeHPMC masisitimu.
Zvidzidzo izvi zvinoburitsa ruzivo nezve polymer chain conformation, aggregation maitiro, uye kudyidzana nemamorekuru ekunyungudutsa.
Kunzwisisa zvimiro zvemukati kunobatsira kufanotaura iyo macroscopic rheological maitiro uye optimize maumbirwo ezvivakwa zvinodiwa.
6.Dynamic Mechanical Analysis (DMA):
DMA inoyera viscoelastic zvimiro zvezvinhu pasi peoscillatory deformation.
Zvidzidzo zveRheological vachishandisa DMA zvinojekesa paramita senge modulus yekuchengetera (G'), kurasikirwa modulus (G”), uye yakaoma viscosity sebasa re frequency uye tembiricha.
DMA inonyanya kubatsira pakuratidza maitiro akasimba-akafanana uye emvura-seye HPMC gels nemapasita.
7.Application-Chaiyo Zvidzidzo:
Zvidzidzo zveRheological zvakagadzirirwa kune chaiwo mashandisirwo akadai semapiritsi emishonga, apo HPMC inoshandiswa sebhainda, kana muzvigadzirwa zvekudya senge sosi nemapfekero, kwaanoita seanokora uye anodzikamisa.
Zvidzidzo izvi zvinogonesa HPMC maumbirwo ezvainoda kuyerera zvivakwa, magadzirirwo, uye pasherufu kugadzikana, kuve nechokwadi chekuita kwechigadzirwa uye kugamuchirwa kwevatengi.
rheological zvidzidzo zvinoita basa rakakosha mukunzwisisa maitiro akaomarara eHPMC thickener masisitimu. Nekujekesa viscosity, shear-kuonda, thixotropy, gelation, zvimiro, uye application-chaiyo zvivakwa, zvidzidzo izvi zvinofambisa dhizaini uye optimization yeHPMC-yakavakirwa maumbirwo mumaindasitiri akasiyana siyana.
Nguva yekutumira: May-10-2024