Ho rarolla bothata ba hore lipekere tsa polyurethane tse tloaelehileng li sekametse tšenyong le ho hloka bokhoni ba ho iphekola, bafuputsi ba hlahisitse lipekere tsa polyurethane tse iphekolang tse nang le li-agent tsa pholiso tsa 5 wt% le 10 wt% ka mokhoa oa Diels-Alder (DA) cycloaddition. Liphetho li bontša hore ho kenyelletsoa ha li-agent tsa pholiso ho eketsa thatafalo ea ho koahela ka 3%–12% mme ho fihlella bokhoni ba pholiso ea ho ngoapa ba 85.6%–93.6% ka metsotso e 30 mochesong oa 120 °C, e leng se eketsang bophelo ba tšebeletso ea lipekere haholo. Phuputso ena e fana ka tharollo e ncha bakeng sa tšireletso ea bokaholimo ba thepa ea boenjiniere.
Lefapheng la thepa ea boenjiniere, ho lokisoa ha tšenyo ea mechini linthong tsa ho koahela e bile phephetso e kholo ka nako e telele. Le hoja liphahlo tsa polyurethane tsa setso li bontša ho hanyetsa le ho khomarela hantle ha boemo ba leholimo, ts'ebetso ea tsona ea tšireletso e fokotseha ka potlako hang ha ho hlaha maqeba kapa mapetso. Ba susumelitsoe ke mekhoa ea baeloji ea ho iphekola, bo-rasaense ba qalile ho hlahloba thepa ea ho iphekola e thehiloeng holim'a litlamo tse matla tsa covalent, 'me karabelo ea Diels-Alder (DA) e fumana tlhokomelo e kholo ka lebaka la maemo a eona a bobebe a karabelo le ho khutlisetsoa morao ho molemo. Leha ho le joalo, lipatlisiso tse teng li shebane haholo le litsamaiso tsa polyurethane tse otlolohileng, li siea sekheo thutong ea thepa ea ho iphekola liphahlong tsa phofo ea polyurethane tse hokahaneng ka sefapano.
Ho phunyeletsa tšitiso ena ea tekheniki, bafuputsi ba lehae ba ile ba hlahisa metsoako e 'meli ea pholiso ea DA ka boqapi—furan-maleic anhydride le furan-bismaleimide—tsamaisong ea resin ea polyester e nang le hydroxylated, ba nts'etsapele lesela la phofo ea polyurethane le nang le thepa e ntle ea ho ipholisa. Phuputso e sebelisitse ¹H NMR ho netefatsa sebopeho sa metsoako ea pholiso, differential scanning calorimetry (DSC) ho netefatsa ho khutlisetsoa morao ha likarabo tsa DA/retro-DA, le mekhoa ea nanoindentation hammoho le surface profilometry ho lekola ka mokhoa o hlophisehileng thepa ea mechini le litšobotsi tsa holim'a liphahlo.
Mabapi le mekhoa ea bohlokoa ea liteko, sehlopha sa lipatlisiso se qalile ka ho kopanya metsoako ea pholiso ea DA e nang le hydroxyl ka mokhoa oa mehato e 'meli. Ka mor'a moo, phofo ea polyurethane e nang le metsoako ea pholiso ea 5 wt% le 10 wt% e ile ea lokisoa ka ho kopanya metsoako ea tšepe ka ho sebelisa ho fafatsa ka motlakase. Ka ho bapisa le lihlopha tsa taolo tse se nang metsoako ea pholiso, tšusumetso ea mahloriso a metsoako ea pholiso thepeng ea thepa e ile ea hlahlojoa ka mokhoa o hlophisitsoeng.
1.Tlhahlobo ea NMR e Tiisa Sebopeho sa Moemeli oa Pholiso
1 H NMR spectra e bontšitse hore amine-insert furan-maleic anhydride (HA-1) e bontšitse litlhōrō tsa lesale la DA tse ikhethang ho δ = 3.07 ppm le 5.78 ppm, ha furan-bismaleimide adduct (HA-2) e bonts'itse lets'oao le tloaelehileng la proton ea DA bond ho δ = 4.69 ppm, e tiisang tlhahiso e atlehileng ea metsoako ea pholiso.
2.DSC e Senola Litšobotsi Tse ka Fetohang ka Mocheso
Di-curve tsa DSC di bontshitse hore disampole tse nang le di-agent tse fodisang di bontshitse ditlhoro tsa endothermic bakeng sa karabelo ya DA ho 75 °C le ditlhoro tse ikgethang bakeng sa karabelo ya retro-DA ho tloha ho 110–160 °C. Sebaka sa tlhoro se ile sa eketseha ka dikahare tse hodimo tsa di-agent tse fodisang, tse bontshang ho kgona ho fetola mocheso hantle.
3.Liteko tsa Nanoindentation li Bontša Ntlafatso ea ho Tiea
Liteko tsa nanoindentation tse nang le botebo bo tebileng li senotse hore ho eketsoa ha metsoako ea pholiso ea 5 wt% le 10 wt% ho ekelitse thatafalo ea ho roala ka 3% le 12%, ka ho latellana. Boleng ba thatafalo ba 0.227 GPa bo ile ba bolokoa esita le botebong ba 8500 nm, bo bakoang ke marang-rang a hokahaneng a entsoeng pakeng tsa metsoako ea pholiso le matrix ea polyurethane.
4.Tlhahlobo ea Sebopeho sa Bokaholimo
Liteko tsa ho se be le bokaholimo li bontšitse hore lipekere tse hloekileng tsa polyurethane li fokolitse boleng ba substrate Rz ka 86%, ha lipekere tse nang le li-agent tse folisang li bontšitse keketseho e nyane ea ho se be le bokaholimo ka lebaka la boteng ba likaroloana tse kholoanyane. Litšoantšo tsa FESEM li bontšitse liphetoho tse bonahalang sebopehong sa bokaholimo tse bakoang ke likaroloana tsa li-agent tse folisang.
5.Katleho e Kholo ea ho Folisa ka Bokhoni ba ho Qala
Liteko tsa microscopy ea mahlo li bontšitse hore liphahlo tse nang le sesebelisoa sa pholiso sa 10 wt%, kamora kalafo ea mocheso ho 120 °C metsotso e 30, li bontšitse phokotso ea bophara ba ho qaptjoa ho tloha ho 141 μm ho ea ho 9 μm, e leng se finyeletseng katleho ea pholiso ea 93.6%. Tshebetso ena e phahame haholo ho feta e tlalehiloeng libukeng tse teng bakeng sa litsamaiso tsa polyurethane tse otlolohileng.
E phatlalalitsoe ho Next Materials, thuto ena e fana ka boqapi bo bongata: Ea pele, lipehelo tsa phofo tsa polyurethane tse ntlafalitsoeng tse fetotsoeng ke DA li kopanya thepa e ntle ea mechini le bokhoni ba ho ipholisa, li fihlella ntlafatso ea thatafalo ea ho fihla ho 12%. Ea bobeli, tšebeliso ea theknoloji ea ho fafatsa ka motlakase e netefatsa ho hasana ho ts'oanang ha li-agent tsa pholiso ka har'a marang-rang a hokahaneng, ho hlola ho se nepahale ha sebaka ho tloaelehileng ha mekhoa ea setso ea microcapsule. Habohlokoa le ho feta, lipehelo tsena li fihlella katleho e phahameng ea pholiso mochesong o tlase haholo (120 °C), li fana ka ts'ebeliso e kholo ea indasteri ha e bapisoa le mocheso oa pholiso oa 145 °C o tlalehiloeng libukeng tse seng li ntse li le teng. Thuto ha e fane feela ka mokhoa o mocha oa ho atolosa bophelo ba tšebeletso ea lipehelo tsa boenjiniere empa hape e theha moralo oa khopolo-taba bakeng sa moralo oa limolek'hule oa lipehelo tse sebetsang ka tlhahlobo ea eona ea bongata ba kamano ea "khatello ea moemeli oa pholiso-ts'ebetso". Ntlafatso ea nakong e tlang ea litaba tsa hydroxyl ho li-agent tsa pholiso le karolelano ea li-cross-linkers tsa uretdione ho lebelletsoe ho sutumelletsa meeli ea ts'ebetso ea lipehelo tsa ho ipholisa.
Nako ea poso: Loetse-15-2025