(PU)Pale i ka luhi, kiʻekiʻe-mahana, ho'ōla pono'ī ʻo Polyurethane Elastomer: Hana ʻia ma o kahi pūnaewele hoʻololi covalent dinamika ma muli o ka waikawa Ascorbic

Ua hoʻomohala nā kānaka noiʻi i kahi elastomer polyurethane hou e pili ana i kahi pūnaewele adaptive covalent dynamic i loaʻa mai ka ascorbic acid (A-CCANs). Ma ka hoʻohana ʻana i ka hopena synergistic o keto-enol tautomerism a me nā pilina carbamate dynamic, loaʻa i ka mea nā waiwai kūikawā: kahi mahana decomposition thermal o 345 °C, kahi stress fracture o 0.88 GPa, kahi ikaika compressive o 268.3 MPa (ka omo ikehu o 68.93 MJ·m⁻³), a me kahi strain koena ma lalo o 0.02 ma hope o 20,000 mau pōʻaiapuni. Hōʻike pū ia i ka ho'ōla pono'ī i loko o kekona a me ka pono hana hou a hiki i ka 90%, e hāʻawi ana i kahi hopena holomua no nā noi ma nā polokalamu akamai a me nā mea kūkulu.

Ua kūkulu kēia haʻawina hoʻomaka i kahi pūnaewele adaptive covalent dynamic (A-CCANs) me ka hoʻohana ʻana i ka waikawa ascorbic ma ke ʻano he poloka kūkulu kumu. Ma o ka tautomerism keto-enol i hoʻolālā pono ʻia a me nā pilina carbamate dynamic, ua hana ʻia kahi elastomer polyurethane kupaianaha. Hōʻike ka mea i ke kūpaʻa wela e like me ka polytetrafluoroethylene (PTFE) - me ka mahana decomposition thermal e like me 345 °C - ʻoiai e hōʻike ana i kahi kaulike kūpono o ka paʻakikī a me ka maʻalahi: kahi koʻikoʻi haki maoli o 0.88 GPa, a me ka hiki ke mālama i kahi koʻikoʻi o 268.3 MPa ma lalo o 99.9% compression strain ʻoiai e omo ana i ka 68.93 MJ·m⁻³ o ka ikehu. ʻOi aku ka kupaianaha, hōʻike ka mea i kahi koʻikoʻi koena ma lalo o 0.02% ma hope o 20,000 mau pōʻaiapuni mechanical, ho'ōla ponoʻī i loko o hoʻokahi kekona, a loaʻa ka pono hana hou o 90%. ʻO kēia hoʻolālā hoʻolālā, ka mea e hoʻokō ai i ka ʻōlelo nane "loaʻa ka iʻa a me ka wāwae o ka bea," hāʻawi i kahi hopena kipi no nā noi e like me nā mea hiki ke hoʻokomo akamai a me nā mea cushioning aerospace, kahi e koʻikoʻi ai ka ikaika mechanical a me ke kūpaʻa o ke kaiapuni.