Zotsogola Zatsopano mu Zida za Polyurethane Zokonzekera Kwambiri Kwambiri

Kupanga zida za polima zokhala ndi mphamvu yodzichiritsa, kotero kuti zida zowonongeka zitha kudzichiritsa bwino ndikukonzanso, ndi njira imodzi yochepetsera "kuipitsa koyera". Komabe, n'kovuta kuzindikira kutentha kwa chipinda kudzikonza nokha kwa ma polima agalasi chifukwa cha kuchulukana kwa ma molekyulu komanso kuzizira kwa maukonde a mayendedwe a molekyulu. Ngakhale kuti zopambana zapangidwa mu magalasi odzichiritsa polima zipangizo m'zaka zaposachedwa, otsika makina katundu, zovuta kukonza njira ndi nthawi yaitali kukonza kumapangitsa kukhala kovuta kuti kwenikweni ntchito. Choncho, chitukuko cha zipangizo zapamwamba za polima zomwe zimatha kukonzanso mofulumira mu galasi la galasi mosakayikira ndizovuta kwambiri.

Posachedwapa, gulu la Prof. Jinrong Wu ku Koleji linanena za galasi la hyperbranched polyurethane (UGPU) lomwe lingathe kukonzedwa mofulumira kutentha. Mu ntchitoyi, ofufuzawo adapeza zida za polyurethane zokhala ndi maunyolo acyclic heteroatomic ndi ma hyperbranched pochita ndi njira yophatikizika ya monomer. Mapangidwe apadera a mamolekyuwa amaphatikiza ma motility apamwamba a ma polima a hyperbranched okhala ndi ma hydrogen bond angapo a polyurethanes kuti apange network yolumikizana kwambiri ya haidrojeni yotengera urea, ma urethane bond, ndi magulu anthambi a hydroxyl.UGPU ili ndi mphamvu zolimba mpaka mpaka 70 MPa, modulus yosungiramo 2.5 GPa, ndi kutentha kwa galasi komwe kumakhala kokwera kwambiri kuposa kutentha kwa chipinda (53 ℃), zomwe zimapangitsa UGPU kukhala pulasitiki yolimba yowonekera.

UGPU ili ndi luso lodzichiritsa lokha, ndipo imatha kuzindikira kudzichiritsa kwagalasi pansi pamavuto. Panthawi imodzimodziyo, ofufuzawo adapeza kuti madzi ochepa kwambiri omwe amagwiritsidwa ntchito ku gawo la UGPU amafulumizitsa kwambiri kukonzanso. Ndi mbiri yanthawi zonse ya zida zodzichiritsa zokha. Kuphatikiza apo, chitsanzo chokonzedwacho chimatha kukana kuyesa kwa 10 MPa, komwe ndi kokwanira kukwaniritsa zofunikira pakukonzanso mwachangu ndikupitiliza ntchito pambuyo pakuwonongeka kwa zigawo zamapangidwe.