Macromolecular Monomer Txuj Ci
Hauv cov qauv no, macromonomers (feem ntau methoxy polyethylene glycol methacrylate) nrog cov haujlwm polymerization tau npaj los ntawm esterification cov tshuaj tiv thaiv, thiab tom qab ntawd cov monomers nrog qee qhov sib xyaw tau sib xyaw ua ke thiab cov khoom tau ncaj qha polymerized los ntawm kev daws polymerization. Cov txheej txheem hluavtaws no zoo li yooj yim, tab sis cov txheej txheem sib cais nruab nrab thiab kev ntxuav kom huv yog qhov nyuaj thiab tsis kim. Lub tuam txhab Japanese Catalyst siv luv, ntev cov saw methoxy polyethylene glycol methacrylate thiab methacrylic acid rau copolymerize ncaj qha mus rau hauv cov pob zeb ua admixture nrog kev ua haujlwm zoo cia thiab polyether sab saw.
Kev siv tshuaj tiv thaiv Macromolecular
Hauv cov qauv no, polycarboxylic acid nrog paub qhov txheeb ze molecular hnyav tau tsim tawm ua ntej, thiab tom qab ntawd txuas rau polycarboxylic acid los ntawm esterification cov tshuaj tiv thaiv ntawm polyether nrog paub txheeb ze molecular phaus ntawm qhov kub dua nyob rau hauv qhov kev txiav txim ntawm catalyst. Txawm li cas los xij, vim muaj qee hom thiab qee yam tshwj xeeb ntawm cov khoom lag luam polycarboxylic acid, nws nyuaj rau kho nws cov lus sib xyaw thiab cov phaus molecular sib txheeb ze. Tib lub sijhawm, vim qhov tsis zoo ntawm polycarboxylic acid thiab polyether, cov haujlwm ua haujlwm ntawm esterification yog qhov nyuaj. Nrog cov txheej txheem esterification, dej tsis tu ncua nchuav tawm, thiab kev sib cais theem yuav tshwm sim.
Yog tias polyether monool lossis diol uas muaj kev sib raug zoo nrog polycarboxylic acid tuaj yeem xaiv, qhov teeb meem ntawm kev sib cais theem tuaj yeem daws tau. Nws Jing li al. synthesized ib hom Polycarboxylic Dej Txo Siv Hluav Taws Xob los ntawm kev siv monomer styrene thiab maleic anhydride rau polymerize ua ntej, tom qab ntawd sulfonate thiab esterify the copolymer. Lub tshuab nqus dej muaj qhov siab dispersibility thiab zoo slump cia.
Hauv-situ Polymerization thiab Qiv
Cov txheej txheem sib xyaw ua ke polymerization thiab esterification, uas yog, polyether yog siv los ua cov tshuaj tiv thaiv nruab nrab ntawm cov roj av tsis sib xyaw ntawm carboxylic acid, thiab esterification tshwm sim tib lub sijhawm ntawm polymerization ntawm unsaturated monomers ntawm carboxylic acid, yog li zam qhov teeb meem ntawm qhov tsis zoo ntawm polycarboxylic acid thiab polyether. Ntxoov thiab li al. maj mam ntxiv qhov sib xyaw daws ntawm acrylic acid monomer, hloov mus rau lwm tus neeg sawv cev thiab tus pib ua cov tshuaj aqueous ntawm methoxy polyethylene glycol nrog tus txheeb ze molecular phaus ntawm 2000. Tom qab 45 feeb ntawm cov tshuaj tiv thaiv ntawm 60 ℃, qhov kub tau nce mus txog 120 ℃, thiab cov av noo tau muab tshem tawm tsis tu ncua hauv kev tiv thaiv N2 (li 50 min). Tom qab ntawd qhov kub ntawm catalyst tau nce mus rau 165 ℃, thiab lub sijhawm muab tshuaj tiv thaiv yog 1 h. Cov khoom tau los ntawm pob. Txawm hais tias hom no tuaj yeem tswj tus txheeb ze molecular phaus ntawm cov polymers, cov txheej txheem synthesis yooj yim thiab cov nqi tsim tawm yog tsawg, cov monomers uas muaj cov pab pawg carboxyl tsuas tuaj yeem xaiv tau feem ntau, txwv tsis pub nws nyuaj rau kev sib tsoo, thiab qhov kev sib tsoo no yog qhov rov ua kom rov zoo li qub. kev tawm tsam. Muaj dej ntau heev rau hauv kev tiv thaiv ua ntej, thiab nws tus lej ntawm lub pob yog tsis siab thiab nyuaj rau kev tswj hwm. Molecular tsim yog qhov nyuaj.
