Polyanionic cellulose (PAC) ndi chochokera ku cellulose, chomwe ndi polysaccharide yopezeka mwachilengedwe yomwe imapezeka m'makoma a zomera.PAC imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana, kuphatikiza kubowola mafuta, kukonza chakudya, mankhwala, ndi zodzoladzola, chifukwa chamankhwala ake apadera.Kapangidwe kake, kapangidwe kake, ndi mawonekedwe ake zimapangitsa kuti ikhale chowonjezera chofunikira pamagwiritsidwe ambiri.
Mapangidwe a Cellulose:
Selulosi ndi mzere wa polysaccharide wopangidwa ndi mayunitsi obwerezabwereza a mamolekyu a β-D-glucose olumikizidwa ndi β(1→4) glycosidic bond.Chigawo chilichonse cha shuga chimakhala ndi magulu atatu a hydroxyl (-OH), omwe ndi ofunikira pakusintha kwamankhwala.
Kusintha kwa Chemical:
Ma cellulose a polyanionic amapangidwa kudzera mukusintha kwa mankhwala a cellulose.Njira yosinthira imaphatikizapo kuyambitsa magulu a anionic pamsana wa cellulose, ndikuupereka ndi zinthu zinazake.Njira zodziwika bwino zosinthira cellulose ndi monga etherification ndi esterification reaction.
Magulu a Anionic:
Magulu a anionic omwe amawonjezeredwa ku cellulose panthawi yosinthidwa amapereka mphamvu za polyanionic ku polima.Maguluwa amatha kukhala ndi carboxylate (-COO⁻), sulfate (-OSO₃⁻), kapena magulu a phosphate (-OPO₃⁻).Kusankhidwa kwa gulu la anionic kumatengera zomwe mukufuna komanso zomwe zimagwiritsidwa ntchito ndi cellulose ya polyanionic.
Chemical Mapangidwe a PAC:
Kapangidwe kake ka cellulose ka polyanionic kumasiyanasiyana kutengera njira ya kaphatikizidwe ndi ntchito yomwe akufuna.Komabe, nthawi zambiri, PAC imakhala ndi msana wa cellulose wokhala ndi magulu a anionic omwe amaphatikizidwapo.Digiri ya substitution (DS), yomwe imatanthawuza kuchuluka kwa magulu a anionic pamtundu uliwonse wa shuga, imatha kusiyanasiyana komanso kukhudza kwambiri machitidwe a PAC.
Chitsanzo Kapangidwe ka Chemical:
Chitsanzo cha kapangidwe kake ka cellulose ya polyanionic yokhala ndi magulu a carboxylate ndi motere:
Mapangidwe a Polyanionic Cellulose
Pamapangidwe awa, mabwalo abuluu amayimira magawo a shuga a msana wa cellulose, ndipo zozungulira zofiira zimayimira magulu a carboxylate anionic (-COO⁻) omwe amaphatikizidwa ndi mayunitsi ena a glucose.
Katundu:
Polyanionic cellulose imawonetsa zinthu zingapo zofunika, kuphatikiza:
Kusintha kwa Rheology: Imatha kuwongolera kukhuthala ndi kutayika kwamadzimadzi pazinthu zosiyanasiyana, monga kukumba madzi m'makampani amafuta.
Kusunga madzi: PAC imatha kuyamwa ndikusunga madzi, kuwapangitsa kukhala othandiza pazinthu zomwe zimafunikira kuwongolera chinyezi, monga zakudya kapena mankhwala.
Kukhazikika: Kumawonjezera kukhazikika ndi magwiridwe antchito osiyanasiyana poletsa kupatukana kapena kuphatikiza.
Biocompatibility: M'mapulogalamu ambiri, PAC ndi biocompatible komanso yopanda poizoni, ndikupangitsa kuti ikhale yoyenera kugwiritsidwa ntchito muzamankhwala ndi zakudya.
Mapulogalamu:
Polyanionic cellulose imapezeka m'mafakitale osiyanasiyana:
Mafuta akubowola madzi: PAC ndi chowonjezera chachikulu pakubowola matope kuti azitha kuwongolera kukhuthala, kutayika kwamadzimadzi, komanso kuletsa kwa shale.
Kukonza chakudya: Kumagwiritsidwa ntchito ngati thickener, stabilizer, kapena chosungira madzi muzakudya monga sosi, mavalidwe, ndi zakumwa.
Pharmaceuticals: PAC imagwira ntchito ngati binder, disintegrant, kapena viscosity modifier pamapangidwe amapiritsi, kuyimitsidwa, ndi zopaka pamutu.
Zodzoladzola: Zimagwiritsidwa ntchito popanga zodzikongoletsera monga zopaka, mafuta odzola, ndi mashamposi kuti azitha kuwongolera komanso kukhazikika.
Kupanga:
Njira yopangira cellulose ya polyanionic imaphatikizapo njira zingapo:
Kupeza ma cellulose: Ma cellulose nthawi zambiri amachokera ku zamkati zamatabwa kapena ma linter a thonje.
Kusintha kwa Chemical: Ma cellulose amakumana ndi etherification kapena esterification kuti ayambitse magulu anionic pa mayunitsi a glucose.
Kuyeretsedwa: Ma cellulose osinthidwa amayeretsedwa kuti achotse zonyansa ndi zinthu zina.
Kuyanika ndikuyika: Selulosi yoyeretsedwa ya polyanionic imawumitsidwa ndikupakidwa kuti igawidwe kumafakitale osiyanasiyana.
polyanionic cellulose ndi chochokera ku cellulose chosinthidwa ndi mankhwala okhala ndi magulu anionic omwe amamangiriridwa ku msana wa cellulose.Kapangidwe kake ka mankhwala, kuphatikiza mtundu ndi kachulukidwe ka magulu a anionic, kumatsimikizira zomwe zili ndi kuyenera kwa ntchito zosiyanasiyana m'mafakitale monga kubowola mafuta, kukonza chakudya, mankhwala, ndi zodzoladzola.Kudzera pakuwongolera bwino kaphatikizidwe ndi kapangidwe kake, cellulose ya polyanionic ikupitilizabe kukhala chowonjezera chofunikira pazambiri ndi machitidwe ambiri padziko lonse lapansi.
Nthawi yotumiza: Apr-11-2024