Iyo mvura solubility yeiyo yakagadziridzwa cellulose ether inokanganiswa nekushisa. Kazhinji, kazhinji ma cellulose ana avanonyanyoka mumvura pakupisa kwakadzika. Kana tembiricha ikawasuka, solubility yavo zvishoma nezvishoma inova murombo uye pakupedzisira inova isingaonekwe. Pasi pedzimba dzinotsoropodza tembiricha
Iko kudziya kwemvura yakakwirira methylcellose mhinduro yakadzidzwa uye maitiro ekuchinja mukushanduka kwakatsanangurwa. Sezvataurwa pamusoro apa, apo mhinduro yeMethylcellose iri pane yakadzika tembiricha, macromolecules yakakomberedzwa nemamolekyudhi emvura kuti aumbe cage chimiro checge. Kupisa kwakashandiswa nekumuka kwehydrogen chisungo pakati pemamolecule yemvura, uye methrolecule yeiyo hydrophobic group on the cellulose macromolecular cax Gadzirira uye dzidza iyo hydrophobic ushamwari hwe hydroxyprupyl methylcellose thermy yakakurudzira hydrogel. Kana iyo methyl mapoka pane imwechete molecular cheni ine hydrophobically yakasungwa, iyi intramolecular yekudyidzana ichaita kuti morekuru ese aoneke. Nekudaro, kuwedzera kwe tembiricha kuchawedzera kufamba kwechirimo, iyo hydrophobic kudyidzana mumorekuru ichave isina kugadzikana, uye iyo ma molecular china ichachinja kubva kune yakasungirirwa nyika kune imwe nyika. Panguva ino, iyo hydrobic yekudyidzana pakati pemamorikiti inotanga kutonga. Kana tembiricha zvishoma nezvishoma ikasimuka, zvisungo zveHydrogen zvakaputswa, uye zvimwe uye zvimwe cellulose Cellrolose ma molecules Nekuwedzera kuwedzera kwekushisa, pakupedzisira zvisungo zvese zveHydrogen zvakaputswa, uye maHydrophobic Association inosvika pakukwira, kuwedzera nhamba uye saizi yehydrophobic aggregates. Munguva iyi, methylcellose inova isingawirirane zvishoma nezvishoma uye pakupedzisira kusazvibata zvachose mumvura. Kana tembiricha ichisimuka kusvika kune iyo nguva-matatu-dimensional network network inoumbwa pakati macromolecules, inoratidzika kunge inoumba gel macroscopically.
Jun Gao naGeorge Haidar et Al vakadzidza tembiricha yeHydroxypropyl Soluce Solution, uye vakareva kuti iyo yepazasi yekudzora tembiricha yehydroxpropypropropyl Cellulosel Cellulose Pakusiya tembiricha kupfuura 390c, iyo imwe molecular cheni ye hydroxyprus cellylosel cellown Kana tembiricha yakawedzera kusvika 390c, iyo hydrobic yekudyidzana pakati pemaketani anonyora anova akasimba, macromolecules aggregate, uye iyo solubility yemvura yePolymer inova murombo. Nekudaro, pane ino tembiricha, chikamu chidiki che hydroxypressl Cellulose vanogadzira vamwe vakasununguka maCoglar majaya, nepo mamalekyudhi mazhinji achiri mumamiriro akapararira maketani asina kuroora. Kana tembiricha ichisimuka kusvika 400c, more macromolecules inotora chikamu chekuumbwa kwekuunganidzwa, uye iyo solubility inova yakaipa uye panguva ino, vamwe mamorekuru vachiri mumatoyi emaketani asina kuroora. Kana tembiricha iri muhuwandu hwe410c-440c, nekuda kweiyo yakasimba hydrophobic mhedzisiro patsva tembiricha, mamalekyudhi anoungana kuti aumbe uye denser naneparticles ine yunifomu yekugoverwa. Kukwidziridzwa kunova kwakakura uye kwakakura. Kuumbwa kweaya hydrophobic aggregates kunotungamira kune kuumbwa kwenzvimbo dzekukwirisa uye dzakaderera dzePolymer mune mhinduro, inonzi microscopic chikamu.
Inofanira kunongedzerwa kuti Nanoparticle aggregates ari mune yekiyoni yakagadzikana nyika, kwete yeiyo thermodynamically yakagadzikana nyika. Izvi zvinodaro nekuti kunyangwe iyo yekutanga cage chimiro chakasimba pakati pehydrophilic hydroxl group uye iyo morekuru emvura, iyo inodzivirira manhukara methyl uye hydroxypruppropyl kubva musanganiswa pakati. Iyo NANOPArticle Aggregates yakasvika yakavezwa yakaenzana uye yakagadzikana nyika pasi peiyo yakabatanidzwa pesvedzero yemhedzisiro maviri.
Uyezve, chidzidzo ichi chakawanawo kuti huwandu hwekudziya hunewo huipi pane kuumbwa kwezvigadzirwa zvakaunganidzwa. Pamuro unokurumidza kupisa, kushamwaridzana kwemaketani anonyariswa nekukurumidza, uye saizi yeiyo yakaumbwa nanoparticles ishoma; Uye kana iyo yekudziya iyo inononoka, macromoleculu ane mikana yakawanda yekuumba yakakura-sized naneparticle aggregates.
Kutumira Nguva: Kubvumbi-17-2023