Impembelelo yesidanga sokutshintshwa (DS) kuMgangatho weHEC

I-HEC (i-hydroxyethyl cellulose) i-non-ionic, i-polymer e-soluble yamanzi esetyenziswa ngokubanzi kumashishini ahlukeneyo afana nokunyamekela komntu, amayeza, kunye nokutya njengento yokuqina, ukubopha, kunye nokuzinzisa. I-degree of substitution (DS) yiparameter ebalulekileyo enokuchaphazela kakhulu iipropati kunye nokusebenza kwe-HEC.

Iqondo lokutshintsha libhekisa kwiavareji yenani lamaqela e-hydroxyethyl adityaniswe kwiyunithi nganye ye-anhydroglucose yomqolo we-cellulose. Ngamanye amazwi, ilinganisa ubungakanani apho i-molecule ye-cellulose iguqulwe ngamaqela e-hydroxyethyl.

Impembelelo yeqondo lokutshintshwa kumgangatho we-HEC ibalulekile. Ngokuqhelekileyo, njengoko iqondo lokutshintshwa landa, i-solubility ye-HEC emanzini iyanda, kwaye i-viscosity yayo iyancipha. I-HEC eneqondo eliphezulu lokutshintshwa ine-viscosity ephantsi, kwaye i-soluble ngakumbi emanzini. Oku kungenxa yokuba amaqela e-hydroxyethyl aphazamisa ukudibanisa kwe-hydrogen phakathi kwamakhonkco e-cellulose, okukhokelela kwisakhiwo esivulekileyo nesiguquguqukayo.

Ngaphezu koko, iqondo eliphezulu lokutshintshwa kunokuphucula ukuzinza kwe-thermal ye-HEC kunye nokwandisa ukuchasana kwayo nokuthotywa kwe-enzymatic. Nangona kunjalo, iqondo eliphezulu eligqithisiweyo lokutshintshwa lingakhokelela ekunciphiseni ubunzima be-molecular kunye nokulahlekelwa kweempawu zokuqala ze-cellulose backbone, ezinokuchaphazela ukusebenza ngokubanzi kwe-HEC.

Isishwankathelo, iqondo lokutshintshwa yipharamitha ebalulekileyo enokuthi ichaphazele kakhulu iipropati kunye nokusebenza kwe-HEC. Iqondo eliphezulu lokutshintshela linokuphucula ukunyibilika kunye nokuzinza kwe-thermal ye-HEC, kodwa iqondo eliphezulu lokutshintshela linokukhokelela ekulahlekelweni kweempawu zokuqala ze-cellulose backbone, ezinokuchaphazela ukusebenza ngokubanzi kwe-HEC.