Cellulose ether bụ ihe dị mkpa polymer nke a na-ejikarị eme ihe na ihe owuwu, ọgwụ, nri na ubi ndị ọzọ. Ihe eji ejide mmiri ya bụ otu n'ime isi ihe maka ọrụ ya n'ọtụtụ ngwa. Arụ ọrụ njide mmiri na-emetụta nrapado, ductility na ịrụ ọrụ nke ihe. Ogo etherification na okpomọkụ nke cellulose ether bụ ihe abụọ dị mkpa na-emetụta njide mmiri ya.
Mmetụta etherification ogo nke cellulose ether na njide mmiri
A na-emepụta ethers cellulose site n'ịgbanwe akụkụ hydroxyl nke cellulose n'ime otu ether. Ogo nke etherification na-ezo aka na ọnụ ọgụgụ ether dị iche iche ewepụtara na nkeji glucose ọ bụla, nke a na-eji tụọ ogo nnọchi nke ethers cellulose. Ogo nke etherification nwere mmetụta dị ukwuu na njide mmiri nke ethers cellulose. N'ikwu okwu n'ozuzu, ka ogo nke etherification na-abawanye, hydrophilicity nke cellulose ether na-abawanye, na ọrụ njigide mmiri ya na-abawanye.
Ka ogo nke etherification dị elu, otu ìgwè hydrophilic (dị ka methoxy, ethoxy, wdg) na-ewebata n'ime cellulose ether molecular chain. Ndị otu a nwere ike imekọrịta ihe na ụmụ irighiri mmiri site na njikọ hydrogen, na-ewusi cellulose ike ike adsorption nke ether na mmiri mmiri. Ya mere, cellulose ethers nwere ogo etherification dị elu nwere ike ịmịnye ma na-ejigide mmiri na gburugburu iru mmiri, na-eme ka ha mara mma na njide mmiri.
Otú ọ dị, ọkwa dị elu nke etherification, ka mma. Mgbe ogo nke etherification ruru ọkwa ụfọdụ, njide mmiri nke cellulose ether nwere ike ọ gaghị anọgide na-abawanye na mmụba nke ogo nke etherification, ma ọ pụkwara ọbụna ibelata. Nke a bụ n'ihi na mgbe etherification dị oke elu, nhazi nke cellulose ether molecular chain nwere ike gbanwee, na-eme ka ike gwụ nke ike intermolecular, n'ikpeazụ na-emetụta mmịpụta mmiri na njide mmiri. Ya mere, n'ime ngwa bara uru, ethers cellulose nwere ogo etherification kwesịrị ka ahọpụtara dịka ọnọdụ ndị akọwapụtara.
Mmetụta okpomọkụ na njide mmiri nke cellulose ethers
Okpomọkụ bụ ihe ọzọ nwere mmetụta dị mkpa na njide mmiri nke cellulose ethers. N'okpuru ọnọdụ okpomọkụ dị iche iche, ihe njigide mmiri nke ethers cellulose na-akpa àgwà dị iche iche. Dị ka ọ na-adịkarị, mmụba nke okpomọkụ ga-eduga na mbelata nke njide mmiri nke cellulose ethers. Nke a bụ n'ihi na okpomọkụ na-ebili na-eme ka ikpochapụ mmiri dịkwuo ngwa, na-eme ka o sie ike maka ihe onwunwe iji jide mmiri.
Na okpomọkụ dị ala, mmekọrịta dị n'etiti cellulose ether molecules na mmiri mmiri na-esiwanye ike, na-eme ka mmiri dị mma. Ka okpomọkụ na-abawanye, ụmụ irighiri mmiri na-apụ ngwa ngwa, na ike ijide mmiri nke cellulose ether ji nwayọọ nwayọọ na-ebelata. Na mgbakwunye, mmụba okpomọkụ nwere ike imetụta solubility nke cellulose ethers. N'okpuru ụfọdụ ọnọdụ okpomọkụ dị elu, cellulose ether nwere ike ịkwụsị solubility ma ghara ịmepụta otu ngwọta ma ọ bụ colloid, si otú a na-emetụta ọrụ njigide mmiri ya.
Ọ dị mma ịmara na ụdị cellulose ethers dị iche iche nwere mmetụta dị iche iche na mgbanwe okpomọkụ. Ụfọdụ cellulose ethers ka nwere ike ịnọgide na-ejigide mmiri dị mma na okpomọkụ dị elu, ebe ndị ọzọ ga-enwe mbelata dị ukwuu na njide mmiri mgbe okpomọkụ na-ebili ntakịrị. Ya mere, mgbe ị na-ahọrọ cellulose ether, ọ dị mkpa ịme nhọrọ kwesịrị ekwesị dabere na ọnọdụ okpomọkụ nke gburugburu ebe obibi.
Mmekọrịta dị n'etiti ogo etherification na okpomọkụ
Mmetụta nke ogo etherification na okpomọkụ na njide mmiri nke cellulose ether na-emekarị mmekọrịta. N'ime ngwa bara uru, ihe abụọ a na-adịkarị mkpa ka atụle ya nke ọma. Dịka ọmụmaatụ, mgbe a na-eji cellulose ether nwere ogo dị elu nke etherification na gburugburu ebe obibi dị elu, ọ bụ ezie na ọkwa dị elu nke etherification nwere ike ime ka njigide mmiri nke cellulose ether dị elu, a ga-enwekwa ike ikpochapụ mmiri na-ekpo ọkụ na gburugburu ebe okpomọkụ dị elu. mee ngwa ngwa n'otu aka ahụ, si otú a na-ebelata mmetụta njigide mmiri ya n'ezie. Ya mere, na gburugburu ebe okpomọkụ dị elu, ọ nwere ike ịdị mkpa iji cellulose ethers nwere ihe ndị a gbanwere n'ụzọ pụrụ iche iji meziwanye nguzogide okpomọkụ ha na njide mmiri.
N'ụzọ megidere nke ahụ, na ọnọdụ okpomọkụ dị ala, mmetụta nke ogo etherification na njide mmiri nke cellulose ether nwere ike ịpụta ìhè karị. N'okpuru ọnọdụ okpomọkụ dị ala, mmiri na-agbapụta nwayọọ nwayọọ, na cellulose ether nke nwere ọkwa dị elu nke etherification nwere ike ịrụ ọrụ nke ọma na mmiri na-enweta mmiri, si otú ahụ na-eme ka ọrụ njigide mmiri dị mma.
Ogo etherification na okpomọkụ nke cellulose ether bụ ihe ndị dị mkpa na-emetụta ọrụ njigide mmiri ya. Ọganihu dị elu nke etherification, otú ahụ ka hydrophilicity nke cellulose ether na-esiwanye ike ma na-arụ ọrụ njigide mmiri ka mma. Otú ọ dị, ogo dị elu nke etherification nwere ike iduga mgbanwe n'usoro ihe omimi, si otú ahụ na-emetụta njide mmiri. Igwe ọkụ na-ebili na-ebutekarị mbelata nke njide mmiri nke cellulose ethers. Karịsịa na gburugburu ebe okpomọkụ dị elu, mmiri na-ekpo ọkụ na-eme ngwa ngwa, na-emetụta mmetụta njide mmiri. N'ime ngwa ndị bara uru, ọ dị mkpa ịhọrọ cellulose ether na ogo kwesịrị ekwesị nke etherification dabere na ọnọdụ okpomọkụ kpọmkwem na ihe eji eme ihe iji nweta mmetụta njide mmiri kacha mma.
Oge nzipu: Sep-18-2024