Ko te Hydroxypropylmethylcellulose (HPMC) he matū kua noho hei rauemi mata matua i roto i ngā ahumahi maha nā ōna āhuatanga maha-mahi. He mea whakamahi noa hei tāpiri kai, hei whakamātotoru i roto i ngā mea whakapaipai, tae atu ki te whakauru hauora i roto i ngā rongoā maha. Ko tētahi āhuatanga ahurei o te HPMC ko tōna whanonga thixotropic, e āhei ai ki te whakarerekē i ngā āhuatanga matotoru me te rere i raro i ētahi āhuatanga. Hei tāpiri, kei a HPMC matotoru-teitei me te matotoru-iti tēnei āhuatanga, e whakaatu ana i te thixotropy ahakoa i raro i te pāmahana gel.
Ka puta te thixotropy i roto i te HPMC ina angiangi te otinga ina pēhia, ina whakaohokia rānei, ka heke te matotoru. Ka taea hoki te huri i tēnei whanonga; ina tangohia te ahotea, ā, ka waiho te otinga kia okioki, ka hoki mārire te matotoru ki tōna āhua teitei ake. Nā tēnei āhuatanga ahurei ka waiho te HPMC hei wāhanga nui i roto i te maha o ngā ahumahi nā te mea ka taea te tono maeneene ake me te tukatuka māmā ake.
Hei waikura kore-ionic, ka pupuhi te HPMC i roto i te wai hei hanga i te kirikiri. Ko te nui o te pupuhi me te kirikiri e whakawhirinaki ana ki te taumaha ngota me te kukū o te polymer, te pH me te pāmahana o te otinga. Ko te HPMC matotoru teitei he taumaha ngota teitei, ā, ka puta he kirikiri matotoru teitei, ko te HPMC matotoru iti he taumaha ngota iti, ā, ka puta he kirikiri iti ake te matotoru. Heoi, ahakoa ēnei rerekētanga o te mahi, e whakaatu ana ngā momo HPMC e rua i te thixotropy nā ngā huringa hanganga e puta ana i te taumata ngota.
Ko te whanonga thixotropic o te HPMC he hua o te whakaritenga o ngā mekameka polymer nā te ahotea kutikuti. Ina whakamahia te ahotea kutikuti ki te HPMC, ka whakarite ngā mekameka polymer ki te ahunga o te ahotea i tukuna, ka hua ake te whakangaromanga o te hanganga whatunga toru-ahu i noho i te korenga o te ahotea. Ko te whakararuraru o te whatunga ka hua ake te hekenga o te matotoru o te otinga. Ina tangohia te ahotea, ka whakarite anō ngā mekameka polymer i runga i tō rātou aronga taketake, ka hanga anō i te whatunga me te whakahoki mai i te matotoru.
Kei te HPMC anō hoki te thixotropy i raro i te pāmahana whakapūpū. Ko te pāmahana tiēre te pāmahana e hono ai ngā mekameka polymer ki te hanga i tētahi whatunga toru-ahu, ka hanga he tiēre. Kei te kukū, te taumaha ngota me te pH o te otinga o te polymer. He matotoru te tiēre hua, ā, kāore e tere te huri i raro i te pēhanga. Heoi, i raro i te pāmahana whakapūpū, i noho wai tonu te otinga HPMC, engari i whakaatu tonu i te whanonga thixotropic nā te mea he hanganga whatunga kua hangaia. Ka pakaru te whatunga i hangaia e ēnei wāhanga i raro i te pēhanga, ka heke te matotoru. He pai tēnei whanonga i roto i te maha o ngā tono e hiahia ana kia rere ngāwari ngā otinga ina whakaohokia.
He matū maha ngā mahi a te HPMC, he maha ngā āhuatanga ahurei, ko tētahi o ēnei ko tōna whanonga thixotropic. Kei ngā HPMC matotoru-teitei me ngā HPMC matotoru-iti tēnei āhuatanga, e whakaatu ana i te thixotropy ahakoa i raro i te pāmahana gel. Nā tēnei āhuatanga ka waiho te HPMC hei wāhanga nui i roto i te maha o ngā ahumahi e hiahia ana ki ngā otinga e whakahaere ana i te rere ngāwari kia pai ai te tono. Ahakoa ngā rerekētanga o ngā āhuatanga i waenga i ngā HPMC matotoru-teitei me ngā HPMC matotoru-iti, ka puta tō rātou whanonga thixotropic nā te whakaritenga me te whakakorenga o te hanganga whatunga kua hangaia. Nā ōna āhuatanga ahurei, kei te tūhura tonu ngā kairangahau i ngā tono rerekē o te HPMC, me te tumanako ki te waihanga hua hou me te whakarato otinga pai ake mō ngā kaihoko huri noa i te ao.
Wā tuku: 23 o Ākuhata-2023