Sabbin Cigaba a Kayan Aikin Polyurethane don Gyaran Sauri

Haɓaka kayan polymer tare da ikon warkar da kai, ta yadda kayan da suka lalace za su iya warkar da kansu yadda ya kamata kuma su sake haɓakawa, yana ɗaya daga cikin hanyoyin da za a rage “ƙasar ƙazanta ta fari”. Duk da haka, yana da wahala a gane yanayin zafin ɗakin da kansa na gyare-gyare na polymers masu gilashi saboda yawan yawan adadin kwayoyin halitta da kuma daskararrewar cibiyar sadarwa na motsin kwayoyin halitta. Kodayake an sami nasara a cikin gilashin kayan aikin polymer na warkarwa a cikin 'yan shekarun nan, ƙananan kaddarorin injiniyoyi, hanyoyin gyare-gyare masu rikitarwa da kuma tsawon lokacin gyarawa yana da wuya a yi amfani da su a zahiri. Sabili da haka, haɓaka kayan aikin polymer mai girma wanda ke iya yin saurin gyarawa a cikin yanayin gilashin babu shakka babban ƙalubale ne.

Kwanan nan, ƙungiyar Farfesa Jinrong Wu a Kwalejin ta ba da rahoton wani gilashin gilashin polyurethane (UGPU) wanda za'a iya gyarawa da sauri a yanayin zafi. A cikin wannan aikin, masu binciken sun sami kayan polyurethane tare da sarƙoƙi na heteroatomic acyclic da sifofin hyperbranched ta hanyar amsawa tare da hanyar monomer guda biyu. Wannan tsari na musamman na kwayoyin halitta ya haɗu da babban motsi na kwayoyin halitta na hyperbranched polymers tare da nau'o'in hydrogen na polyurethanes don samar da cibiyar sadarwa mai yawa na hydrogen dangane da urea bonds, urethane bonds, da rassan hydroxyl kungiyoyin. UGPU yana da ƙarfin ƙarfi har zuwa 70 MPa, ma'auni na ajiya na 2.5GPa, da zafin jiki na gilashin da ya fi girma fiye da yawan zafin jiki (53 ℃), wanda ke sa UGPU ta zama filastik filastik mai haske.

UGPU yana da kyakkyawan ikon warkar da kansa, kuma yana iya gane warkarwa ta gilashi a ƙarƙashin matsin lamba. A lokaci guda kuma, masu binciken sun gano cewa ƙananan ƙananan ruwa da aka yi amfani da su a cikin sashin UGPU sun inganta saurin gyaran. Rikodi ne na kowane lokaci don kayan warkar da kai. Bugu da ƙari, samfurin da aka gyara zai iya tsayayya da gwajin gwaji na 10 MPa, wanda ya isa ya dace da buƙatun aikace-aikacen gaggawar gyaran gyare-gyare da ci gaba da sabis bayan lalacewa ga sassan tsarin.