Kodi mankhwala a ethyl cellulose ndi ati?

Ethylcellulose ndi chochokera ku cellulose, polima wachilengedwe wopangidwa ndi mayunitsi a shuga.Amapangidwa pochita ma cellulose ndi ethyl chloride kapena ethylene oxide, kupanga mamolekyu olowa m'malo mwa cellulose.Ethylcellulose ili ndi mankhwala osiyanasiyana omwe amapangitsa kuti ikhale yothandiza pamafakitale ndi mankhwala osiyanasiyana.

Kapangidwe ka Molecular:

Ethylcellulose imasungabe maziko a cellulose, omwe amakhala ndi mayunitsi obwerezabwereza omwe amalumikizidwa ndi β-1,4-glycosidic bond.

Kusintha kwa ethyl kumachitika makamaka pamagulu a hydroxyl a cellulose msana, zomwe zimapangitsa kuti magawo osiyanasiyana alowe m'malo (DS) akuwonetsa kuchuluka kwamagulu a ethyl pagawo la shuga.

Mlingo wa m'malo zimakhudza katundu wa ethylcellulose, kuphatikizapo solubility, mamasukidwe akayendedwe, ndi filimu kupanga luso.

Kusungunuka:

Chifukwa cha chikhalidwe cha hydrophobic cha gulu la ethyl, ethylcellulose sichisungunuka m'madzi.

Imawonetsa kusungunuka mumitundu yosiyanasiyana ya zosungunulira, kuphatikiza ma alcohols, ketoni, esters, ndi ma hydrocarboni a chlorinated.

Kusungunuka kumawonjezeka ndi kuchepa kwa kulemera kwa maselo ndi kuchuluka kwa ethoxylation.

Kupanga Mafilimu:

Ethylcellulose imadziwika chifukwa cha luso lake lopanga filimu, zomwe zimapangitsa kuti zikhale zofunika kwambiri popanga zokutira, mafilimu, ndi kupanga mankhwala oyendetsedwa bwino.

Kuthekera kwa ethylcellulose kusungunula mumitundu yosiyanasiyana yamadzimadzi kumathandizira kupanga filimu, ndipo kenako kutuluka kwa zosungunulira kumasiya filimu yofananira.

Kuchitanso:

Ethylcellulose amawonetsa reactivity yotsika pansi pamikhalidwe yabwinobwino.Komabe, imatha kusinthidwa mwamachitidwe monga etherification, esterification, ndi kulumikizana.

Zochita za etherification zimaphatikizapo kuyambitsa zowonjezera zowonjezera pa cellulose msana, potero kusintha katundu.

Esterification imatha kuchitika pochita ethylcellulose ndi carboxylic acid kapena acid chlorides, kupanga ma cellulose esters ndi kusungunuka kosinthika ndi zina.

Zolumikizana zolumikizana zitha kuyambika kuti zipititse patsogolo mphamvu zamakina komanso kukhazikika kwamafuta amtundu wa ethyl cellulose.

Kutentha kotentha:

Ethylcellulose imasonyeza kukhazikika kwa kutentha mkati mwa kutentha kwina, kupitirira pamene kuwonongeka kumachitika.

Kuwonongeka kwa kutentha kumayambira pafupifupi 200-250 ° C, kutengera zinthu monga kuchuluka kwa m'malo ndi kukhalapo kwa mapulasitiki kapena zowonjezera.

Thermogravimetric analysis (TGA) ndi differential scanning calorimetry (DSC) ndi njira zomwe zimagwiritsidwa ntchito nthawi zambiri kusonyeza khalidwe la kutentha kwa ethylcellulose ndi kusakanikirana kwake.

kugwilizana:

Ethylcellulose imagwirizana ndi ma polima ena osiyanasiyana, mapulasitiki ndi zowonjezera, zomwe zimapangitsa kuti zikhale zoyenera kusakanikirana ndi zinthu zina kuti zikwaniritse zomwe mukufuna.

Zowonjezera zowonjezera zimaphatikizapo mapulasitiki monga polyethylene glycol (PEG) ndi triethyl citrate, zomwe zimapangitsa kusinthasintha ndi kupanga mafilimu.

Kugwirizana ndi zosakaniza zogwiritsira ntchito mankhwala (APIs) ndizofunikira kwambiri popanga mafomu a mlingo wa mankhwala monga mapiritsi otulutsidwa nthawi yaitali ndi zigamba za transdermal.

Zolepheretsa:

Mafilimu a ethylcellulose amawonetsa zotchinga zabwino kwambiri polimbana ndi chinyezi, mpweya ndi nthunzi.

Zotchinga izi zimapangitsa ethylcellulose kukhala yoyenera kuyikapo ntchito pomwe chitetezo kuzinthu zachilengedwe ndizofunikira kwambiri kuti zinthu zisungidwe kukhulupirika komanso alumali moyo.

Makhalidwe a Rheological:

The mamasukidwe akayendedwe a ethylcellulose njira zimadalira zinthu monga polima ndende, mlingo wa m'malo, ndi zosungunulira mtundu.

Mayankho a ethylcellulose nthawi zambiri amasonyeza khalidwe la pseudoplastic, kutanthauza kuti kukhuthala kwawo kumachepa ndi kuwonjezeka kwa kumeta ubweya.

Maphunziro a Rheological ndi ofunikira kuti amvetsetse mawonekedwe otaya a mayankho a ethylcellulose panthawi yokonza ndi zokutira.

Ethylcellulose ndi polima wosunthika wokhala ndi mankhwala osiyanasiyana omwe amathandizira kuti azitha kugwiritsidwa ntchito m'mafakitale ndi mankhwala osiyanasiyana.Kusungunuka kwake, luso lopanga mafilimu, reactivity, kukhazikika kwa kutentha, kugwirizanitsa, zotchinga katundu ndi rheology zimapangitsa kuti zikhale zofunikira zopangira zokutira, mafilimu, kumasulidwa kolamuliridwa kumasulidwa ndi njira zothetsera.Kufufuza kwina ndi chitukuko mu gawo la zotumphukira za cellulose kukupitiliza kukulitsa ntchito ndi kuthekera kwa ethylcellulose m'magawo osiyanasiyana.