Intuthuko Entsha Ezinto Zokusebenza Ze-Polyurethane Zokulungisa Okushesha Kakhulu

Ukuthuthukiswa kwezinto ze-polymer ezinekhono lokuziphilisa, ukuze izinto ezilimele zikwazi ukuziphilisa ngokuphumelelayo futhi zivuselele, kungenye yezindlela zokunciphisa "ukungcola okumhlophe". Kodwa-ke, kunzima ukubona izinga lokushisa legumbi lokuzilungisa ngokwakho kwamapholima ayingilazi ngenxa yokuminyana okuphezulu kwamangqamuzana anqwabelene kanye nenethiwekhi eqandisiwe yokunyakaza kwamaketanga wamangqamuzana. Nakuba ukuphumelela kuye kwenziwa ezintweni ze-polymer zokuziphilisa eziyingilazi eminyakeni yamuva, izakhiwo eziphansi zemishini, izindlela zokulungisa eziyinkimbinkimbi kanye nesikhathi eside sokulungisa kwenza kube nzima ukufakwa ngokoqobo. Ngakho-ke, ukuthuthukiswa kwezinto eziphezulu ze-polymer ezikwazi ukukhanda ngokushesha esimweni seglasi ngokungangabazeki kuyinselele enkulu.

Muva nje, ithimba likaProf. Jinrong Wu eKolishi libike ngengilazi eyingilazi ye-polyurethane (UGPU) engakhandwa ngokushesha ekamelweni lokushisa. Kulo msebenzi, abacwaningi bathola izinto ze-polyurethane ezinamaketanga e-acyclic heteroatomic kanye nezakhiwo ezinamagatsha amakhulu ngokusabela ngendlela ehlanganisiwe ye-monomer. Lesi sakhiwo samangqamuzana esiyingqayizivele sihlanganisa i-molecular motility ephezulu yama-polymers ane-hyperbranched ne-multiple hydrogen bond of polyurethanes ukuze kwakheke inethiwekhi ye-hydrogen bonding ephezulu kakhulu esekelwe kumabhondi e-urea, amabhondi e-urethane, namaqembu e-branched terminal hydroxyl.I-UGPU inamandla aqinile afinyelela phezulu 70 MPa, imodulus yesitoreji engu-2.5 GPa, kanye nezinga lokushisa lengilazi eliphakeme kakhulu kunezinga lokushisa legumbi (53 ℃), okwenza i-UGPU ibe ipulasitiki eyingilazi ekhanyayo eqinile.

I-UGPU inekhono elihle kakhulu lokuziphulukisa, futhi ingabona ukuzelapha okuyingilazi ngaphansi kwengcindezi. Ngesikhathi esifanayo, abacwaningi bathola ukuthi amanani amancane kakhulu amanzi asetshenziswe esigabeni se-UGPU asheshisa kakhulu izinga lokulungisa. Irekhodi lasikhathi sonke lezinto zokuzilapha. Ngaphezu kwalokho, isampula elungisiwe ingamelana nokuhlolwa kwe-creep engu-10 MPa, okwanele ukuhlangabezana nezidingo zesicelo sokulungisa ngokushesha kanye nesevisi eqhubekayo ngemva kokulimala kwezingxenye zesakhiwo.