Zvitsva Zvitsva muPolyurethane Zvishandiso zveUltra-Fast Repair

Kuvandudzwa kwezvigadzirwa zvepolymer nekukwanisa kuzviporesa, kuitira kuti zvinhu zvakakuvadzwa zvigone kuzvirapa uye kugadzirisa patsva, ndiyo imwe yenzira dzekuderedza "kusvibiswa kwakachena". Nekudaro, zvakaoma kuona tembiricha yekamuri yekuzvigadzirisa yega yegirazi mapolymers nekuda kwehupamhi hwepamusoro hwemamorekuru akaturikidzana uye netiweki yechando yekufamba kwema molecular chain. Kunyangwe budiriro yakaitwa mune yegirazi yekuzvipodza yepolymer zvinhu mumakore achangopfuura, iyo yakaderera mekiniki zvivakwa, yakaoma kugadzirisa nzira uye nguva refu yekugadzirisa inoita kuti zviome kunyatso shandiswa. Naizvozvo, kuvandudzwa kwepamusoro-inoshanda polymer zvinhu zvinokwanisa kukurumidza kugadzirisa mune yegirazi mamiriro pasina mubvunzo idambudziko guru.

Munguva ichangopfuura, boka raProfessor Jinrong Wu kuKoreji rakashuma girazi rine hyperbranched polyurethane (UGPU) rinogona kugadziriswa nokukurumidza pakamuri yekushisa. Mubasa iri, vaongorori vakawana zvinhu zve polyurethane zvine acyclic heteroatomic cheni uye hyperbranched zvimiro nekuita nenzira yakabatanidzwa monomer. Ichi chakasarudzika chimiro chemolecular chinosanganisa iyo yakakwira molecular motility ye hyperbranched polymers ine akawanda ma hydrogen bond e polyurethanes kuti iite yakakwirira-density hydrogen bonding network yakavakirwa pa urea bond, urethane bond, uye branched terminal hydroxyl mapoka.UGPU ine simba rekusimba rinosvika kusvika 70 MPa, modulus yekuchengetera ye2.5 GPa, uye tembiricha yegirazi inokwira zvakanyanya kupfuura tembiricha yemukamuri (53 ℃), inoita UGPU purasitiki yakaoma yakajeka.

UGPU ine yakanakisa kuzvirapa kugona, uye inogona kuona yegirazi kuzvirapa pasi pekumanikidzwa. Panguva imwecheteyo, vatsvakurudzi vakaona kuti mvura shoma shoma yakashandiswa kuUGPU chikamu chakawedzera zvakanyanya chiyero chekugadzirisa. Irekodhi yenguva dzose yezvinhu zvekuzviporesa. Zvakare, iyo yakagadziridzwa sampu inogona kuramba bvunzo inokambaira yegumi MPa, iyo inokwana kusangana nezvinodiwa zvekushandisa zvekukurumidza kugadzirisa uye kuenderera mberi sevhisi mushure mekukuvadzwa kwezvikamu zvezvimiro.