I-HydroxyPOpyl Methylcelcelsulose (HPMC) i-polymer yendalo eqhelekileyo isetyenziswa ngokutya, amayeza, cosmetics kunye namanye amasimi. UVenkile lwayo sisikhombisi esibalulekileyo esichaphazela intsebenzo yayo, ehlala inxulumene nezinto ezifana nobunzima be-HPMC, isisombululo, uhlobo lwe-solvent kunye nobushushu.
I-1. Ubunzima bemolekyuli
Ubunzima bemolekyuli ye-HPMC yenye yezona zinto zibalulekileyo ezichaphazela i-viscofity yayo. Ngokubanzi, okukhulu ubunzima bemolekyuli, ixesha elide i-molecular thein ye-HPMC, eyona nto imbi ngakumbi, kwaye iphakamile. Kungenxa yokuba ulwakhiwo lwe-macromolecular i-chain ibonelela ngokudibeneyo okungakumbi, okukhokelela kwizithintelo ezomeleleyo kulwelo lwesisombululo. Ke ngoko, kwi-conces efanayo, izisombululo ze-HPMC ezinamatye amakhulu eemolekyuli zihlala zibonisa izinto eziphezulu.
Ukunyuka kobunzima bemolekyuli kuchaphazela iipropathi ze-viscoelate yesisombululo. Izisombululo ze-HPMC ezinamatye aphezulu eemolekyuli ezibonisa i-vickiveracity eqinileyo kumazinga asezantsi asezantsi, ngelixa amaxabiso asezantsi asezantsi anokuziphatha njengolwelo olutsha. Oku kwenza ukuba i-HPMC ibe ne-ROVERIRORS enobunzima be-roheeology kwimeko ezahlukeneyo zokusebenzisa.
2. Isisombululo sobuninzi
Uxinzelelo lwesisombululo lunempembelelo ebonakalayo kuhlobo lwe-HPMC. Njengoko uxinzelelo lwe-HPMC, ukunxibelelana phakathi kweemolekyuli kwisisombululo kuyanda, kukhokelela ekunyukeni kokunganyangeki kokuhamba okunyukayo kwaye ke kwandise i-viscosity. Ngokubanzi, ukugxininiswa kwe-HPMC kubonisa ukukhula kwe-nonline ngaphakathi koluhlu oluthile, oko kukuthi, ireyithi apho ukubonwa koxinzelelo ngokuthe ngcembe kuyacotha.
Ngakumbi kwizisombululo ezixineneyo, ukusebenzisana phakathi kwamakhonkco eemolekyuli kunamandla, kwaye izakhiwo zenethiwekhi okanye ukungqubana zinokwenzeka, eziya kwandisa ngakumbi ukubonwa kwesisombululo. Ke ngoko, kwizicelo zemizi mveliso, ukuze kufezekiswe ulawulo lwe-viscofity olufanelekileyo, kuhlala kuyimfuneko ukuhlengahlengisa uxinzelelo lwe-HPMC.
3. Uhlobo lwesinyithi
Ukuluka kunye nokubonisa i-HPMC ikwanxulumene nohlobo lwe-solvent esetyenzisiweyo. I-HPMC idla ngokusebenzisa amanzi njengesolvent, kodwa phantsi kweemeko ezithile, ezinye izinto ezinjalo zezolutho ezifana ne-ethanol kunye ne-acetone zinokusetyenziswa. Amanzi, njenge-polalar ye-polar, unokusebenzisana ngokunamandla kunye namaqela e-hydroxyl kunye ne-methyl kwiimolekyuli ze-HPMC ukukhuthaza ukupheliswa kwayo.
I-polared ye-solvent, iqondo lobushushu, kunye nonxibelelwano phakathi kwesinyibilikisi kunye neemolekyuli ze-HPMC eziza kuchaphazela ukuluka kunye nokubonisa i-HPMC. Umzekelo, xa isetyenziselwa inyikima ye-polay ephantsi, i-smobility ye-HPMC iyancipha, imphumo kuhlobo olusezantsi lwesisombululo.
4. Ubushushu
Iziphumo zobushushu kwi-viscosity ye-HPMC ikwabalulekile kakhulu. Ngokubanzi, isisombululo sesisombululo se-HPMC sincipha ngokukhulisa ubushushu obukhulayo. Kungenxa yokuba xa iqondo lobushushu liyanda, intshukumo ye-molecular inyuka, isiphumo sokubuthathaka kumandla onxibelelwano phakathi kweemolekyuli, ngaloo ndlela kunciphisa i-viscofity.
Kumaqondo athile obushushu, ipropathi ye-gecal yesisombululo se-HPMC bonisa indlela yokuziphatha ebonakalayo engasemva, oko kukuthi, i-viscosity ayichaphazelekanga kuphela yireyithi ye-Shear, kodwa ichaphazeleka kakhulu lutshintsho lobushushu. Ke ngoko, kwizicelo ezisebenzayo, utshintsho olwenziweyo lobushushu yenye yeendlela ezisebenzayo zokulungisa i-HPMC.
I-5. Ixabiso le-Shear
Uhlobo lwesisombululo se-HPMC alichaphazelekanga kuphela kwizinto ezinqabileyo, kodwa kunye nenqanaba le-Shear. I-HPMC ngumkhweli ongemva kwendlu, kunye neenguqu zayo zotshintsho ngokutshintsha kwenqanaba le-Shear. Ngokubanzi, isisombululo se-HPMC sibonisa i-viscofity ephezulu kumaxabiso asezantsi asezantsi, ngelixa i-viscosity inciphisa kakhulu kumazinga amachiza aphezulu. Le phengnomeno ibizwa ngokuba yiShering.
Iziphumo zenqanaba le-Shear kwi-viscosity yesisombululo se-HPMC ihlala inxulumene nokuziphatha okuhamba kweemolekyuli. Kumazinga asezantsi asezantsi, amakhoboka eemolekyuli athambekele ekubambeni kunye, okukhokelela kwi-viscofity ephezulu; Kumanqanaba aphezulu eenqanawa, ukusebenzisana phakathi kwamakhonkco eemolekyuli aphukile kwaye i-viscosity iphantsi.
I-6. Ixabiso le-pH
I-viscosity ye-HPMC ikwanxulumene nexabiso le-pH yesisombululo. Iimolekyuli ze-HPMC ziqukethe i-hydroxypropy ye-hydroxypropy kunye namaqela e-methyl, kunye nemeko ethengiswayo kwala maqela achaphazeleka yi-PH. Kumanqanaba athile e-hle, iimolekyuli ze-HPMC zinokuthi i-ioniza okanye ye-geses, ngokwenza oko ukutshintsha i-viscofity yesisombululo.
Ngokubanzi, kwiimeko ze-acidic okanye i-alkaline, isakhiwo se-HPMC sinokutshintsha, sichaphazele ukusebenzisana kwaso ngeemolekyuli zeSolvent kwaye,, zichaphazela uVeksisity. Kwiimpawu ezahlukeneyo ze-PH, uzinzo kunye ne-RheOology yezisombululo ze-HPMC zinokwahluka, ke kufuneka kuthathelwe ingqalelo kulawulo lwe-PH ngexesha lokusetyenziswa.
7. Isiphumo sezongezo
Ukongeza kwezi zinto zingasentla, iikopi ezithile ezifana neetyuwa kunye ne-surfacints zinokuchaphazela i-HPMC ye-HPMC. Ukongezwa kweetyiwa kunokuhlala kutshintsha amandla e-Ionic yesisombululo, ngaloo ndlela kuchaphazela ukunyibilikisa kunye nohlobo lwe-HPMC Molekyuli. I-surfacapes inokutshintsha isakhiwo se-phudmc ngokutshintsha ukusebenzisana phakathi kweemolekyuli, ngaloo ndlela ukutshintsha i-viscofity.
Uhlobo lwe-HPMC luchatshazelwa zizinto ezininzi, kubandakanya ubunzima bemolekyuli, ukugxila kwesisombululo, uhlobo lwesinyibilikayo, iqondo lobushushu, inqanaba le-Shear, ixabiso le-PH kunye nezongezelelo. Ukwenzela ukulawula iimpawu ze-viscosity ze-HPMC, ezi zinto kufuneka zilungiswe ngokufanelekileyo ngokwenyani iimfuno zesicelo. Ngokuqonda ezi zinto zibangela ukuphazamiseka, ukwenziwa kwe-HPMC kunokuphelelwa kwimveliso eyahlukeneyo kunye nemeko yokusebenzisa izixhobo ukuqinisekisa ukuzinza kunye nokusebenza kwazo kwizicelo ezahlukeneyo.
Ixesha lasemva: ngoFebruwari-15-2025