Umthelela We-Methyl Hydroxyethyl Cellulose Ku-Epoxy Resin Matrix

I-Methyl Hydroxyethyl Cellulose (MHEC) iyi-ether ye-cellulose encibilikayo emanzini esetshenziswa kabanzi embonini yezokwakha njenge-thickener kanye ne-rheology modifier ezinhlelweni zikasimende. Kwaziwa ngokuthuthukisa izakhiwo zokugeleza, ukusebenza, kanye nokunamathela kwezinto zikasimende, okuyenza ibe isithasiselo esifanelekile sokwakheka kukakhonkolo, udaka, kanye negrout. Kodwa-ke, umthelela we-MHEC ezimpahleni ze-epoxy resin matrices uthole ukunakwa okuncane.

Ama-epoxy resins ayikilasi lama-polymers e-thermosetting asetshenziswa kakhulu ezimbonini ze-aerospace, zezimoto, nezokwakha ngenxa yezakhiwo zabo ezinhle kakhulu zemishini, ukumelana namakhemikhali, nokunamathela kuma-substrates ahlukahlukene. Kodwa-ke, zingaba brittle futhi zibonise amandla omthelela ophansi, okukhawulela ukusetshenziswa kwazo kwezinye izinhlelo zokusebenza. Ukuze kuxazululwe le nkinga, abacwaningi baye baphenya ukusetshenziswa kwezithasiselo ezihlukahlukene, kuhlanganise ne-cellulose ethers, ukuze kuthuthukiswe ukuqina nomthelela wokuphikiswa kwama-epoxy resins.

Ucwaningo oluningana lubike ukusetshenziswa kwe-MHEC njengesengezo kumatrices e-epoxy resin. Isibonelo, isifundo sikaKim et al. (2019) iphenye umthelela we-MHEC ezimpahleni zomshini zezinhlanganisela ezisuselwa ku-epoxy. Abacwaningi bathola ukuthi ukungezwa kwe-MHEC kuthuthukisa ukuqina kwe-fracture namandla omthelela wezinhlanganisela, kanye nokuzinza kokushisa nokumelana kwamanzi. Ababhali bathi lokhu kuthuthukiswa kunamandla we-MHEC okwenza izibopho ze-hydrogen nge-epoxy resin matrix, okwandisa ukunamathela kobuso nokuvimbela ukusakazeka kokuqhekeka.

Olunye ucwaningo olwenziwe nguPan et al. (2017) uphenye umphumela we-MHEC ekuziphatheni kokwelapha kanye nezakhiwo zemishini zesistimu ye-epoxy resin. Abacwaningi bathola ukuthi ukungezwa kwe-MHEC kubambezele isikhathi sokuphulukisa futhi kunciphise izinga lokushisa eliphezulu lokuphulukisa le-epoxy resin, okuthiwa yimvelo ye-hydrophilic ye-MHEC. Kodwa-ke, ukungezwa kwe-MHEC kuphinde kwathuthukisa amandla okuqina kanye nokwelula ngesikhathi sokuphumula kwe-epoxy resin ephulukisiwe, okubonisa ukuthi i-MHEC ingathuthukisa ukuguquguquka nokuqina kwe-epoxy resin matrix.

Ngaphezu kokuthuthukisa izakhiwo zemishini ye-epoxy resin matrices, i-MHEC iphinde yabikwa ukuthi inomthelela omuhle ezindaweni ze-rheological zezinhlelo ezisekelwe epoxy. Isibonelo, isifundo sika-Li et al. (2019) iphenye umphumela we-MHEC ku-rheology kanye nezakhiwo zemishini zokunamathisela okususelwa ku-epoxy. Abacwaningi bathola ukuthi ukungezwa kwe-MHEC kuthuthukisa ukuziphatha kwe-thixotropic kwe-adhesive futhi kunciphise ukulungiswa kwama-fillers. Ukwengezwa kwe-MHEC kuphinde kwathuthukisa amandla okunamathela kanye nokumelana nomthelela we-adhesive.

Sekukonke, ukusetshenziswa kwe-MHEC njengesengezo kumatrices e-epoxy resin kubonise imiphumela ethembisayo ekuthuthukiseni izakhiwo zemishini, ukuqina, nokuziphatha kwe-rheological yesistimu. Ikhono le-MHEC lokwenza izibopho ze-hydrogen nge-epoxy resin matrix kukholakala ukuthi liyindlela eyinhloko ngemuva kwalokhu kuthuthukiswa, okungaholela ekwandeni kokunamathela kobuso nokunciphisa ukusakazeka kokuqhekeka. Kodwa-ke, ucwaningo olwengeziwe luyadingeka ukuze kuqondwe ngokugcwele umthelela we-MHEC ezimpahleni zamatrices e-epoxy resin nokwandisa ukusetshenziswa kwale ether cellulose ekwakhiweni okusekelwe epoxy.