Njide mmiri bụ ihe dị mkpa maka ọtụtụ ụlọ ọrụ na-eji ihe hydrophilic dị ka cellulose ethers. Hydroxypropylmethylcellulose (HPMC) bụ otu n'ime ethers cellulose nwere nnukwu njigide mmiri. HPMC bụ polymer synthetic nke sitere na cellulose, a na-ejikarị ya eme ihe n'ụdị dị iche iche na ụlọ ọrụ mmepụta ihe, ọgwụ na nri.
A na-eji HPMC eme ihe n'ọtụtụ ebe dị ka thickener, stabilizer na emulsifier na ngwaahịa nri dị iche iche dị ka ice cream, sauces na uwe iji welie udidi ha, nkwụsi ike na ndụ shelf. A na-ejikwa HPMC na-emepụta ọgwụ na-emepụta ọgwụ na ụlọ ọrụ na-emepụta ọgwụ dị ka onye na-ekekọta, disintegrant na ihe mkpuchi ihe nkiri. A na-ejikwa ya dị ka ihe na-ejigide mmiri na ihe eji arụ ụlọ, tumadi na ciment na ngwa agha.
Idobe mmiri bụ ihe dị mkpa na-ewu n'ihi na ọ na-enyere aka mee ka simenti na ngwa ngwa agwakọta ọhụrụ ghara ịnwụ. Ịkpọ nkụ nwere ike ịkpata mbelata na mgbawa, na-ebute ihe ndị na-adịghị ike na ndị na-adịghị akwụ ụgwọ. HPMC na-enyere aka idowe ọdịnaya mmiri dị na simenti na ngwa agha site na ịmịnye ụmụ irighiri mmiri ma jiri nwayọọ nwayọọ na-ahapụ ha ka oge na-aga, na-ekwe ka ihe ụlọ na-agwọta nke ọma ma sie ike.
Ụkpụrụ njide mmiri nke HPMC dabeere na hydrophilicity ya. N'ihi ọnụnọ nke otu hydroxyl (-OH) na usoro ihe omimi ya, HPMC nwere oke mmekọrịta maka mmiri. Otu hydroxyl na-emekọrịta ihe na ụmụ irighiri mmiri iji mepụta njikọ hydrogen, na-eme ka e guzobe shei hydration gburugburu ụdọ polymer. Shei hydrated na-enye ohere ka ụdọ polymer gbasaa, na-abawanye olu nke HPMC.
Ọzịza nke HPMC bụ usoro siri ike na-adabere n'ihe dị iche iche dị ka ogo nke nnọchi (DS), nha nha, okpomọkụ na pH. Ogo nke nnọchi na-ezo aka na ọnụọgụ nke otu hydroxyl nọchiri anya otu anhydroglucose n'ime agbụ cellulose. Ọnụ ahịa DS dị elu, nke dị elu nke hydrophilicity na mma na-arụ ọrụ njigide mmiri. The urughuru size nke HPMC na-emetụta mmiri njigide, dị ka nta ahụ nwere a ukwuu n'elu ebe kwa unit uka, dapụtara na ukwuu mmiri absorption. Okpomọkụ na uru pH na-emetụta ogo ọzịza na njide mmiri, yana okpomọkụ dị elu na uru pH dị ala na-eme ka ọzịza na njide mmiri nke HPMC dịkwuo elu.
Usoro njigide mmiri nke HPMC gụnyere usoro abụọ: absorption na desorption. N'oge absorption, HPMC na-amịkọrọ mmiri ụmụ irighiri mmiri site na gburugburu ebe obibi, na-akpụ shei hydration gburugburu ụdọ polymer. Shei hydration na-egbochi ụdọ polymer ka ọ daa ma mee ka ha kewapụ iche, na-eduga na ọzịza nke HPMC. Mkpụrụ ndụ mmiri na-etinye uche na ya na-etolite njikọ hydrogen na otu hydroxyl dị na HPMC, na-eme ka ọrụ njide mmiri dịkwuo elu.
N'oge desorption, HPMC ji nwayọọ nwayọọ na-ahapụ mmiri molekul, na-ekwe ka ihe owuwu na-agwọ ọrịa nke ọma. Ntọhapụ nke ụmụ irighiri mmiri na-adị ngwa ngwa na-eme ka simenti na ngwa ngwa na-anọgide na-enwe mmiri zuru oke, na-eme ka ọ bụrụ ihe kwụsiri ike ma dịgidere. Ntọhapụ ngwa ngwa nke ụmụ irighiri mmiri na-enyekwa mmiri na-enye ciment na ngwa agha mmiri mgbe nile, na-eme ka usoro ọgwụgwọ ahụ dịkwuo elu ma na-abawanye ike na nkwụsi ike nke ngwaahịa ikpeazụ.
Na nchịkọta, njide mmiri bụ ihe dị mkpa maka ọtụtụ ụlọ ọrụ na-eji ihe hydrophilic dị ka cellulose ethers. HPMC bụ otu n'ime cellulose ethers nwere nnukwu njigide mmiri ma na-eji ya eme ihe na-ewu ụlọ, ọgwụ na ụlọ ọrụ nri. Ihe njide mmiri nke HPMC dabeere na hydrophilicity ya, nke na-enyere ya aka ịmịkọrọ mmiri mmiri site na gburugburu ebe obibi, na-eme ka shei hydration gburugburu ụdọ polymer. Shei nwere hydrated na-eme ka HPMC zaa, na ntọhapụ nke ụmụ irighiri mmiri na-eme ngwa ngwa na-eme ka a hụ na ihe ụlọ ahụ na-anọgide na-enwe mmiri mmiri zuru oke, na-eme ka ọ bụrụ ihe kwụsiri ike na nke na-adịgide adịgide.
Oge nzipu: Ọgọst-24-2023