Ukuzeliswa kwamanzi kwi-Ether yeSelsuse eguqulweyo kuyachaphazeleka ngamaqondo obushushu. Ngokubanzi, uninzi lweselseulose esuka emanzini ngamaqondo obushushu asezantsi. Xa iqondo lobushushu liyanyuka, ukuzola kwabo ngokuthe ngcembe bahlwempuzekile kwaye ekugqibeleni kuya kunqabile. Ubushushu obuncinci besisombululo
Ukufudumeza kwezisombululo ze-methylcelcelsulose ze-methylcelsulose kufundwe kwaye indlela yotshintsho ku-Solubaint ichaziwe. Njengoko kuchaziwe apha ngasentla, xa isisombululo seMethylcelceal sisezantsi, i-macromolecules ijikelezwe ziimolekyuli zamanzi ukwenza isakhiwo sekheji. Ubushushu obusetyenzisiweyo lunyuka kobushushu buya kwaphula i-hydrogen ye-hydrogen phakathi kwemolekyuli yamanzi, kwaye imolekyuli yamanzi iya kutshabalala i-Mydromolebar Chain ityhilwe, eyenza Ukulungiselela kunye nokufunda umanyano lwe-hydrophobypropyl methylcelcelcelgalose e-hydrogel. Ukuba amaqela e-methyl kwi-molecular efanayo ye-hydrophopoly, esi sivumelwano sentsusa siyakwenza yonke imolekyuli ibonakale ihlatywe. Nangona kunjalo, ukwanda kwamaqondo obushushu kuya komeleza intshukumo yecandelo le-chain, unxibelelwano lwe-hydrophobic kwimolekyuli ayizukuhlala, kwaye i-molecular thein izakutshintsha kwimo ethe tyiweyo. Ngeli xesha, ukusebenzisana kwe-hydrophobic phakathi kweemolekyuli kuqala. Xa iqondo lobushushu linyuka ngokuthe ngcembe, iibhondi ezingaphezulu kunye ne-hydrogen zaphukile, kwaye ezinye ze-selsulose ye-erselose zihlukaniswe ne-cege, kunye ne-macromolebs esondeleyo kwi-hydrophote e-hydrophote. Ngonyuso olungaphezulu kubushushu, ekugqibeleni zonke iibhondi ze-hydrogen zaphukile, kwaye umanyano lwayo lwe-hydrophobic lufikelela kwinani kunye nobungakanani be-hiddrophotes. Ngeli xesha lenkqubo, iMethylcelfulose iyaqhubeka ngokuthe ngcembe kwaye ekugqibeleni i-insulancy emanzini. Xa iqondo lobushushu liyenyuka ukuya kwinqanaba apho ubume benethiwekhi ezintathu zenziwe khona phakathi kwe-macromolecules, kubonakala ngathi buyitha ijeli macroscopic.
UJun Gao noGeorge Haidar Et Al funda isiphumo seqondo lobushushu le-hydroploplproplose ngokusasazeka kwesisombululo se-hydroplopy malunga ne-410c. Kumaqondo obushushu asezantsi kune-390C, i-molecular ye-molecular ye-HydroxyPlPLy Selelose ikwimo ebiyelwe ngokungekho mthethweni, kwaye i-hydrodynamic radions ngokubanzi, kwaye akukho luhlu phakathi kweMacromolecules. Xa amaqondo obushushu anyuka aye kwi-390C, unxibelelwano lwe-hydrophobic phakathi kweemolekyuli luba lusomelela, i-macromoleules ihlanganisana, kwaye ukubenzela amanzi i-polymer ye-polymer iba lihlwempu. Nangona kunjalo, ngeli qondo, inxalenye encinci ye-hydroplopy yeemolekyuli ezizimeleyo ezineemolekyuli ezimbalwa, ngelixa uninzi lweemolekyuli lusekwimeko yamakhonkco angasasazeki. Xa iqondo lobushushu liphuma ukuya kwi-400c, i-macromolecules ithatha inxaxheba ekwenzeni i-Agegregates, kwaye ukunyibilikisa kuya kuba kubi nangakumbi, kodwa ngeli xesha, ezinye iimolekyuli zisekwimeko enye. Xa iqondo lobushushu likuluhlu lwe-410c-440C, ngenxa yefrentshi le-hydrophobic eyomeleleyo kumaqondo obushushu aphezulu, iimolekyuli ezingakumbi zihlanganisana ukwenza i-nanopalicals amakhulu ne-denserns. UKHUSELEKO LUYA KUKHONA NODRST. The formation of these hydrophobic aggregates leads to the formation of regions of high and low concentration of polymer in solution, a so-called microscopic phase separation.
Kufuneka ichaze ukuba i-NanoPregacates ye-NanoPardile ikwimeko eqingqiweyo ye-kizethete, hayi ilizwe elizinzileyo le-thermody. Kungenxa yokuba imeko yekheji yokuqala itshatyalalisiwe, kusekho i-hydrogen ye-hydrogen phakathi kwe-hydroxic hydroxyl ye-hydroxyl kunye nemolekyuli yamanzi, ethintela amaqela e-hydrophopy kunye ne-hydroxyl ukusuka kwindibaniselwano phakathi. I-NanoPregaricates Aggregates ifikelele kwinqanaba elilinganayo kunye nelizwe elizinzileyo phantsi kwempembelelo edibeneyo yeziphumo ezibini.
Ukongeza, esi sifundo sifumanise ukuba inqanaba lokufudumeza linempembelelo ekusekweni kwamasuntswana ahlanganisiweyo. Kwinqanaba lokufudumeza ngokukhawuleza, ukudityaniswa kweemolekyuli zemolekyuli ngokukhawuleza, kwaye ubungakanani bexeshana lokuba nakwenziwe nakwenziwe nakwaa. Kwaye xa inqanaba lokufudumeza lihamba kancinci, i-macromolecules inamathuba amaninzi okwenza iindawo ezinkulu ze-nanoprecates.
Ixesha leposi: APR-17 ukuya ku-923