Ukuqhubela phambili okutsha kwiiMathiriyeli zePolyurethane zoLungiso lwe-Ultra-Fast

Ukuphuhliswa kwezixhobo zepolymer kunye nokukwazi ukuziphilisa, ukwenzela ukuba izinto ezonakalisiweyo zikwazi ukuziphilisa ngokufanelekileyo kunye nokuvuselela, enye yeendlela zokunciphisa "ukungcola okumhlophe". Nangona kunjalo, kunzima ukuqaphela ubushushu begumbi ukuzilungisa ngokwakho kweepholima zeglasi ngenxa yokuxinana okuphezulu kokupakishwa kwemolekyuli kunye nomnatha onomkhenkce wentshukumo yetsheyina lemolekyuli. Nangona ukuphumelela kwenziwe kwi-glassy self-healing polymer materials kwiminyaka yamuva nje, iimpawu eziphantsi zomatshini, iindlela zokulungisa eziyinkimbinkimbi kunye nexesha elide lokulungisa zenza kube nzima ukusetyenziswa ngokoqobo. Ngoko ke, ukuphuhliswa kwezinto eziphezulu zepolymer ezikwazi ukulungiswa ngokukhawuleza kwimeko yeglasi ngokungathandabuzekiyo ngumngeni omkhulu.

Kungekudala, iqela likaProf. Jinrong Wu eKholeji libike i-glassy hyperbranched polyurethane (UGPU) enokulungiswa ngokukhawuleza kwiqondo lokushisa. Kulo msebenzi, abaphandi bafumana izinto ze-polyurethane ezinamatyathanga e-acyclic heteroatomic kunye nezakhiwo ze-hyperbranched ngokusabela ngendlela edibeneyo ye-monomer. Olu lwakhiwo lukhethekileyo lwemolekyuli ludibanisa ukuhamba kwemolekyuli ephezulu yeepolymers ezine-hyperbranched kunye ne-hydrogen bond ezininzi ze-polyurethanes ukwenza i-high-density hydrogen bonding network esekelwe kwiibhondi ze-urea, iibhondi ze-urethane, kunye namaqela e-terminal hydroxyl. I-70 MPa, imodyuli yokugcina ye-2.5 GPa, kunye nobushushu beglasi obuphezulu kakhulu kunobushushu begumbi (53 ℃), eyenza i-UGPU ibe yiplastiki yeglasi ecacileyo eqinileyo.

I-UGPU inamandla okuziphilisa, kwaye inokuqonda ukuziphilisa ngokweglasi phantsi koxinzelelo. Ngelo xesha, abaphandi bafumanisa ukuba amanani amancinci kakhulu amanzi asetyenziswe kwicandelo le-UGPU akhawulezise izinga lokulungisa. Yingxelo yexesha lonke yezixhobo zokuziphilisa. Ngaphezu koko, isampula esilungisiweyo sinokumelana novavanyo lwe-creep ye-MPa eyi-10, eyaneleyo ukuhlangabezana neemfuno zesicelo sokulungiswa ngokukhawuleza kunye nenkonzo eqhubekayo emva komonakalo kumacandelo ezakhiwo.