I-Hydroxyethyl cellulose (HEC)Ihlala inyibilika kakhulu emanzini kumanqanaba obushushu abanzi, nakwiindawo ezinobushushu obuphezulu apho ezinye ii-non-ionic chemically modified cellulose ethers ezifana ne-methyl cellulose (MC) kunye ne-hydroxypropyl methyl cellulose (HpMC) zibonisa amanqaku okuxinana. Ukuze kucaciswe unobangela wokunyibilika okuphezulu kwe-HEC, ukuxhomekeka kobushushu be-nH yamanzi kwiyunithi nganye ye-glucopyran kwiisampuli ze-HEC kuhlolwe kumanqanaba obushushu alandelayo ukusuka kwi-10 ukuya kwi-70 °C kusetyenziswa umlinganiselo we-dielectric spectrum ophezulu kakhulu ukuya kuthi ga kwi-50 GHz.
Kolu phononongo, iisampulu ze-HEC zihlolwe inani le-molar ye-hydroxyethyl substitutions (MS) yeyunithi nganye ye-glucose pyran ukusuka kwi-1.3 ukuya kwi-3.6. Zonke iisampulu ze-HEC zinyibilikisiwe emanzini ngaphakathi koluhlu lobushushu oluhloliweyo kwaye azibonisanga manqaku okutshabalala. Ixabiso le-nH leesampulu ze-HEC ezine-MS 1.3 li-14 kwi-20 °C, kwaye liyancipha kancinci xa ubushushu bunyuka, kwaye lehla liye kwi-10 kwi-70 °C. Ixabiso le-PH lesampulu ye-HEC ngokucacileyo likhulu kunexabiso elincinci le-nH elibalulekileyo elimalunga ne-5 Cellulose ethers ezifana ne-MC kunye ne-HpMC kufuneka zinyibilikiswe emanzini, nokuba kuluhlu lobushushu obuphezulu.
Nangona kunjalo, iimolekyuli ze-HEC ziyanyibilika emanzini kuluhlu olubanzi lobushushu. Ukuxhomekeka kobushushu be-nH yeesampuli ze-HEC kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) kuncinci kwaye ziyafana. Olu qwalaselo lubonisa ngamandla ukuba ukuziphatha komswakama/ukuphelelwa ngamanzi emzimbeni kweesampuli ze-HEC kulawulwa kakhulu ngamaqela azo atshintshiweyo. I-3 yi-14 kwi-20 °C, yehla kancinci njengoko ubushushu bunyuka, kwaye yehla iye kwi-10 kwi-70 °C. Ixabiso le-nH lesampuli ye-HEC ngokucacileyo likhulu kunexabiso elincinci le-nH elibalulekileyo elimalunga ne-5 Cellulose ethers ezifana ne-MC kunye ne-HpMC kufuneka zinyibilikiswe emanzini, nokuba kuluhlu lobushushu obuphezulu. Nangona kunjalo, iimolekyuli ze-HEC ziyanyibilika emanzini kuluhlu olubanzi lobushushu. Ukuxhomekeka kobushushu be-nH yeesampuli ze-HEC kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) kuncinci kwaye ziyafana.
Olu phononongo lubonisa ngamandla ukuba indlela yokuziphatha kwamanzi/ukuphelelwa ngamanzi emzimbeni kwiisampuli ze-HEC ilawulwa kakhulu ngamaqela azo atshintshiweyo. I-3 yi-14 kwi-20 °C, yehla kancinci njengoko ubushushu bunyuka, kwaye yehla iye kwi-10 kwi-70 °C. Ixabiso le-nH lesampuli ye-HEC ngokucacileyo likhulu kunexabiso elincinci le-nH elibalulekileyo elimalunga ne-5. Ii-ether ze-Cellulose ezifana ne-MC kunye ne-HpMC kufuneka zinyibilikiswe emanzini, nokuba zikwinqanaba lobushushu eliphezulu. Nangona kunjalo, iimolekyuli ze-HEC ziyanyibilika emanzini kuluhlu olubanzi lobushushu. Ukuxhomekeka kobushushu be-nH yeI-HECiisampulu kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) zithambile kwaye ziyafana. Olu qwalaselo lubonisa ngamandla ukuba indlela yokuziphatha kwe-hydration/dehydration kwiisampulu ze-HEC ilawulwa kakhulu ngamaqela azo atshintshiweyo.
Ixabiso le-nH lesampuli ye-HEC ngokucacileyo likhulu kunexabiso eliphantsi le-nH elibalulekileyo elimalunga ne-5. Ii-ether ze-cellulose ezifana ne-MC kunye ne-HpMC kufuneka zinyibilike emanzini, nokuba zikwinqanaba lobushushu obuphezulu. Nangona kunjalo, iimolekyuli ze-HEC ziyanyibilika emanzini kuluhlu olubanzi lobushushu. Ukuxhomekeka kobushushu be-nH kwiisampuli ze-HEC kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) kuncinci kwaye ziyafana. Olu qwalaselo lubonisa ngamandla ukuba ukuziphatha komswakama/ukuphelelwa ngamanzi emzimbeni kweesampuli ze-HEC kulawulwa kakhulu ngamaqela azo atshintshiweyo. Ixabiso le-nH lesampuli ye-HEC ngokucacileyo likhulu kunexabiso eliphantsi le-nH elibalulekileyo elimalunga ne-5 Ii-ether ze-Cellulose ezifana ne-MC kunye ne-HpMC kufuneka zinyibilike emanzini, nokuba zikwinqanaba lobushushu obuphezulu. Nangona kunjalo, iimolekyuli ze-HEC ziyanyibilika emanzini kuluhlu olubanzi lobushushu. Ukuxhomekeka kobushushu be-nH kwiisampuli ze-HEC kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) kuncinci kwaye ziyafana.
Olu qwalaselo lubonisa ngamandla ukuba indlela yokuziphatha komswakama/ukuphelelwa ngamanzi emzimbeni kwiisampuli ze-HEC ilawulwa kakhulu ngamaqela azo atshintshiweyo. Iimolekyuli ze-HEC ziyanyibilika emanzini kumanqanaba obushushu abanzi. Ukuxhomekeka kobushushu be-nH kwiisampuli ze-HEC kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) kuncinci kwaye ziyafana. Olu qwalaselo lubonisa ngamandla ukuba indlela yokuziphatha komswakama/ukuphelelwa ngamanzi emzimbeni kwiisampuli ze-HEC ilawulwa kakhulu ngamaqela azo atshintshiweyo.I-HECIimolekyuli ziyanyibilika emanzini kuluhlu olubanzi lobushushu. Ukuxhomekeka kobushushu be-nH kwiisampuli ze-HEC kunye ne-triglycol (iikhompawundi zemodeli ze-HEC substituents) kuncinci kwaye ziyafana. Olu qwalaselo lubonisa ngamandla ukuba ukuziphatha komswakama/ukuphelelwa ngamanzi emzimbeni kweesampuli ze-HEC kulawulwa kakhulu ngamaqela azo atshintshiweyo.
Ixesha leposi: Epreli-25-2024