1. Zvinhu zvemavhiri epolyurethane zvakapfava, zvine kupesana kwakanaka kwekukwesha uye ruzha rwakaderera;nepo mavhiri enylon akaomarara, uye kuramba kwavo kukwesha kwakasiyana zvishoma neiyo yepolyurethane.Semuenzaniso, zvipfeko zvakagadzirwa nenylon zvakare hazvipfeki.
2. Zvinhu zve polyurethane mavhiri uye nylon mavhiri zvakasiyana.Polyurethanes inogadzirwa kubva kune isocyanates (monomers) uye hydroxyl makomisheni.Nekuda kweboka rakasimba repolar carbamate, risinganyunguriki mumapoka asiri-polar, rine mafuta akanaka ekupikisa, kusimba, kusapfeka kupfeka, kuramba kuchembera uye kunamatira.Zvishandiso zvakakodzera kune yakakura tembiricha renji (-50 kusvika 150 ° C) inogona kugadzirirwa kubva kwakasiyana-siyana mbishi, kusanganisira elastomers, thermoplastic resins uye thermosetting resins.Haisi kupikisa hydrolysis pakupisa kwepamusoro, kana kune alkaline medium.Nylon ishoko rakajairwa remapolymer ane mapoka eamide mune inodzokorodza unit ye macromolecular main chain.Polyamides inogona kugadzirwa nemhete-kuvhura polymerization yelactam, kana ne polycondensation yemadiamine uye dibasic acid.
Nguva yekutumira: Zvita-23-2022