Zvidzidzo zve rheological zve Hydroxypropyl Methylcellulose (HPMC) thickener systems zvakakosha pakunzwisisa maitiro adzo mukushandiswa kwakasiyana-siyana, kubva kumishonga kusvika kuchikafu nezvizoro. HPMC chinhu chinobva mu cellulose ether chinoshandiswa zvakanyanya se thickening agent, stabilizer, uye emulsifier nekuda kwekugona kwayo kugadzirisa hunhu hwe rheological hwemhinduro ne suspensions.
1. Kuyerwa kweViscosity:
Kupenya kweropa (viscosity) ndeimwe yemhando dze rheological dzinodzidzwa muHPMC systems. Nzira dzakasiyana-siyana dzakadai se rotational viscometry, capillary viscometry, uye oscillatory rheometry dzinoshandiswa kuyera viscosity.
Zvidzidzo izvi zvinotsanangura mhedzisiro yezvinhu zvakaita sehuwandu hweHPMC, huremu hwemamorekuru, mwero wekutsiva, tembiricha, uye mwero wekuchekwa kwebvudzi pahukobvu.
Kunzwisisa viscosity kwakakosha sezvo kunosarudza maitiro ekuyerera, kugadzikana, uye kukodzera kwekushandisa masisitimu akakora eHPMC.
2. Maitiro ekuderedza kuchekwa kweganda:
Mhinduro dzeHPMC dzinowanzo ratidza maitiro ekutetepa kweganda, zvichireva kuti viscosity yadzo inoderera nekuwedzera kwehuwandu hwekuchekwa kweganda.
Zvidzidzo zveRheological zvinoongorora huwandu hwekuchekwa kweganda uye kutsamira kwaro pazvinhu zvakaita sekuwanda kwepolymer uye tembiricha.
Kutsanangura maitiro ekutetepa kweganda kwakakosha pakushandisa senge machira nemanamati, uko kuyerera kwemvura panguva yekuisa uye kugadzikana mushure mekushandisa kwakakosha.
3. Thixotropy:
Thixotropy inoreva kudzoreredzwa kwe viscosity kunoenderana nenguva mushure mekubvisa shear stress. Masisitimu mazhinji eHPMC anoratidza maitiro ethixotropic, ayo anobatsira mukushandiswa kunoda kuyerera kwakadzorwa uye kugadzikana.
Zvidzidzo zveRheological zvinosanganisira kuyera kudzoreredzwa kwe viscosity nekufamba kwenguva mushure mekuisa system ku shear stress.
Kunzwisisa thixotropy kunobatsira pakugadzira zvigadzirwa zvakaita sependi, uko kugadzikana panguva yekuchengetwa uye nyore kushandisa kwakakosha.
4. Kuchenesa:
Kana paine huwandu hwakawanda kana kuti paine zvimwe zvinowedzerwa, mhinduro dzeHPMC dzinogona kupfuudzwa, zvichiita kuti pave nechimiro che network.
Zvidzidzo zveRheological zvinoongorora maitiro e gelation maererano nezvinhu zvakaita sekuwanda, tembiricha, uye pH.
Zvidzidzo zve gelation zvakakosha pakugadzira mishonga inoburitswa kwenguva refu uye kugadzira zvigadzirwa zvakagadzikana zvakagadzirwa ne gel mumaindasitiri ezvekudya nekuchengetedza munhu.
5. Hunhu hweMaumbirwo:
Matekiniki akadai se small-angle X-ray scattering (SAXS) uye rheo-SAXS anopa ruzivo rwakadzama nezve marongerwo emasystem eHPMC.
Zvidzidzo izvi zvinoratidza ruzivo nezvekugadzirwa kwepolymer chain, maitiro ekuunganidza, uye kudyidzana nemamorekuru e solvent.
Kunzwisisa mativi echimiro kunobatsira mukufanotaura maitiro e rheological macroscopic uye kugadzirisa mafomula ehunhu hwaunoda.
6. Kuongororwa kweMichina Inoshanduka (DMA):
DMA inoyera hunhu hwe viscoelastic hwezvinhu zviri pasi pekushanduka kwe oscillatory.
Zvidzidzo zveRheological zvinoshandisa DMA zvinotsanangura maparamita akaita se storage modulus (G'), loss modulus (G”), uye complex viscosity senzira ye frequency ne tembiricha.
DMA inonyanya kubatsira pakuratidza maitiro akaita sema gels nema paste eHPMC akafanana neakasimba uye akafanana neasina mvura.
7. Zvidzidzo Zvakanyatsoenderana Nekushandiswa:
Zvidzidzo zve rheological zvakagadzirirwa kushandiswa kwakadai semapiritsi emishonga, uko HPMC inoshandiswa se binder, kana muzvigadzirwa zvekudya zvakaita semasosi nema dressings, uko inoshanda se thickener uye stabilizer.
Zvidzidzo izvi zvinovandudza mafomura eHPMC kuti awane hunhu hwekufamba kwemvura, magadzirirwo, uye kugadzikana kwesherufu, zvichiita kuti chigadzirwa chishande zvakanaka uye chigamuchirwe nevatengi.
Zvidzidzo zve rheological zvinoita basa rakakosha mukunzwisisa maitiro akaomarara ema HPMC thickener systems. Nekutsanangura viscosity, shear-thinning, thixotropy, gelation, structural characteristics, uye maapplication-specific properties, zvidzidzo izvi zvinoita kuti kugadzirwa nekugadziriswa kwema HPMC-based formulations mumaindasitiri akasiyana siyana kuve nyore.
Nguva yekutumira: Chivabvu-10-2024