Impembelelo ye-Methyl Hydroxyethyl Cellulose kwi-Epoxy Resin Matrix

I-Methyl Hydroxyethyl Cellulose (MHEC) yi-ether ye-cellulose e-soluble yamanzi esetyenziswa ngokubanzi kwishishini lokwakha njenge-thickener kunye ne-rheology modifier kwiinkqubo ze-cementitious. Kuyaziwa ukuba kuphuculwe iipropathi zokuhamba, ukusebenza, kunye nokubambelela kwizinto ze-cementitious, okwenza ukuba ibe yinto efanelekileyo yokudibanisa ikhonkrithi, i-mortar kunye ne-grout formulations. Nangona kunjalo, impembelelo ye-MHEC kwiipropati ze-epoxy resin matrices ifumene ingqalelo encinci.

I-Epoxy resins luhlobo lweepolymers ze-thermosetting ezisetyenziswa kakhulu kwindawo ye-aerospace, i-automotive, kunye nemizi-mveliso yokwakha ngenxa yeempawu zabo ezintle zoomatshini, ukuxhathisa imichiza, kunye nokunamathela kwii-substrates ezahlukeneyo. Nangona kunjalo, banokuba brittle kwaye babonise amandla empembelelo ephantsi, ethintela ukusetyenziswa kwabo kwezinye izicelo. Ukujongana nalo mbandela, abaphandi baye baphanda ukusetyenziswa kwezongezo ezahlukeneyo, kubandakanywa i-cellulose ethers, ukuphucula ukuqina kunye nefuthe lokuchasana kwee-epoxy resins.

Izifundo ezininzi ziye zaxela ukusetyenziswa kwe-MHEC njenge-additive in epoxy resin matrices. Umzekelo, isifundo sikaKim et al. (2019) iphande umphumo we-MHEC kwiipropati zomatshini we-epoxy-based composite. Abaphandi bafumanisa ukuba ukongezwa kwe-MHEC kuphuculwe ukunyanzeliswa kwe-fracture kunye namandla eempembelelo ze-composites, kunye nokuzinza kwe-thermal kunye nokuchasana kwamanzi. Ababhali bathi olu phuculo luphuculwe kwisakhono se-MHEC ukwenza iibhondi ze-hydrogen kunye ne-epoxy resin matrix, eyandisa i-adhesion interfacial kunye nokuthintela ukusasazeka kwe-crack.

Olunye uphononongo olwenziwe nguPan et al. (2017) iphande umphumo we-MHEC kwindlela yokuziphatha yokunyanga kunye neempawu zemishini ye-epoxy resin system. Abaphandi bafumanisa ukuba ukongezwa kwe-MHEC kulibazisekile ixesha lokunyanga kwaye kuncitshiswe ukushisa okuphezulu kokunyanga kwe-epoxy resin, ebizwa ngokuba yi-hydrophilic nature ye-MHEC. Nangona kunjalo, ukongezwa kwe-MHEC kukwaphucule amandla okuqina kunye nobude ngexesha lokuphumla kwe-epoxy resin ephilisiwe, ebonisa ukuba i-MHEC inokuphucula ukuguquguquka kunye nokuqina kwe-epoxy resin matrix.

Ukongezelela ekuphuculeni iimpawu zemishini ye-epoxy resin matrices, i-MHEC iphinde yaxelwa ukuba inefuthe elihle kwiimpawu ze-rheological ze-epoxy-based systems. Umzekelo, isifundo sikaLi et al. (2019) iphande umphumo we-MHEC kwi-rheology kunye neempawu zomatshini we-adhesive-based adhesive. Abaphandi bafumanisa ukuba ukongezwa kwe-MHEC kuphuculwe ukuziphatha kwe-thixotropic ye-adhesive kunye nokunciphisa ukulungiswa kweefayili. Ukongezwa kwe-MHEC kwakhona kwaphucula amandla okubambelela kunye nokuchasana kwempembelelo ye-adhesive.

Ngokubanzi, ukusetyenziswa kwe-MHEC njenge-additive in epoxy resin matrices ibonise iziphumo ezithembisayo ekuphuculeni iimpawu zomatshini, ukuqina, kunye nokuziphatha kwe-rheological yenkqubo. Ukukwazi kwe-MHEC ukwenza iibhondi ze-hydrogen kunye ne-epoxy resin matrix kukholelwa ukuba yindlela ephambili emva kolu phuculo, olunokuthi lukhokelela ekwandiseni ukunamathela kwi-interface kunye nokunciphisa ukusasazeka kwe-crack. Nangona kunjalo, uphando olongezelelweyo luyafuneka ukuqonda ngokupheleleyo impembelelo ye-MHEC kwiipropati ze-epoxy resin matrices kunye nokwandisa ukusetyenziswa kwe-cellulose ether kwi-epoxy-based formulations.