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Ndezvipi zvinhu purlyurethane vanopikisa tembiricha dzakakwirira? Kazhinji, polyurethane haisi kuramba kupisa kwakanyanya, kunyangwe neyakajairwa PPDI system, iyo yakakwana tembiricha yekudziya inogona kungotenderera 150 °. Oblary polyester kana polyether mhando inogona kusakwanisa kutsungirira kupisa pamusoro pe120 °. Nekudaro, polyurethane inzvimbo yakanyanya polar polymer, uye ichienzaniswa nemapuranga evanhu, inodzivirira kupisa. Naizvozvo, kutsanangura tembiricha yekudziya yekushomeka kwepamusoro kana kusiyanisa kushandiswa kwakasiyana kunotsoropodza zvakanyanya.
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Saka kudzikama kwakakura kunogona sei kugadzirwa kwePolyurethane zvinhu zvinovandudzwa? Mhinduro yekutanga ndeyekuwedzera iyo crystallinity yezvinyorwa, senge iyo nguva dzose ppdi isocyanate yambotaurwa. Nei kuwedzera kuchema kwePolymer kunorevesa kugadzikana kwayo? Mhinduro yacho inozivikanwa kune wese munhu, kureva kuti, chimiro chinosarudza zvivakwa. Nhasi, isu tinoda kuyedza kutsanangura chikonzero nei kuvandudzwa kwemanyorerwo kujairika kunounza kugadzikana kwekunyora Rutivi rwokuruboshwe rwe gimiririra simba remahara, uye rutivi rworudyi rwequation h inghalpy, s is entropy, uye t is tembiricha.
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Simba remahara emahara isimba rekutyaira, uye hukuru hwayo hunowanzo kukosha pakati pekutanga uye maitiro ekupedzisira, saka chiratidzo chacho chinoshandiswa pamberi payo, sezvo kukosha kwayo hakugone kuwanikwa zvakananga kana kunomiririrwa. Kana △ G inoderera, ie kana isina kunaka, zvinoreva kuti maitiro emakemikari anogona kungoitika kana kuve akanaka pane imwe nzira inotarisirwa. Izvi zvinogona zvakare kushandiswa kuona kuti maitiro aripo here kana kuti anozvidzora kuimba yekutamba. Dhigirii kana chiyero chekudzikiswa chinogona kunzwisiswa sekinetics yekuita pachayo. H ari kunyanya enyanzvi, ayo anogona kunzwisiswa sesimba remukati remamorekuru. Inogona kuve yakajeka inofungidzirwa kubva pane iyo sosi yezvirevo yemavara eChinese, sezvo moto hausi

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S inomiririra gadziriro yehurongwa, iyo inowanzozivikanwa uye chirevo chaicho chakajeka. Iyo ine hukama kana inoratidzwa maererano nekupisa t, uye chirevo chayo chakakosha ndeye degree rekusagadzikana kana rusununguko rwemiumbi microscopic diki. Panguva ino, shamwari diki inocherechedza inogona kunge yakaona kuti tembiricha inoenderana nekuparadzira kupesana kwedu isu tiri kukurukura nhasi pakupedzisira vakaoneka. Rega ndimbondisunga zvishoma nezvepfungwa yemutambo. Enterropy inogona kuve yakapepuka kunonzwisiswa seyakapesana ne crystallinity. Yakakwira kukosha kwekutungamira Iyo yepamusoro iyo molecular mamiriro ekugara, zviri nani crystallo's crystallinity iri. Zvino, ngatitemei chidiki chidiki kubva paraurethene rabber roll uye tarisa chidiki chidiki seyakaipisisa system. Misa kwayo yakatarwa, uchifungidzira kuti mraba inogadzirwa ne100 polyurethane mamorekuru (mune zvakawanda zvishoma nezvishoma Ndokunge, kupokana kunopesana kwePolyurehane madiki madiki akaenzana neInthalpy H uye zvisingaenzaniswi kune iyo entropporis
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Hazvina kuoma kuwana kuti kuvandudzwa kwekristunity hakugone kuderedza kukosha kwetropy, ndiko kuti, ndezveimwe nzira dzakanyanyisa uye dzinotsemuka, zvisinei nekuti tembiricha yekudziya kana tembiricha yekunyungudika. Izvo zvinoda kushandurwa ndechekuti kujairirwa uye kuchema kweMonomer molecular chimiro uye crystallinity yeiyo yakakwira molecular solidha mushure mekuwedzera mutsara, iyo inogona kunzi yakaenzana kana kunzwisiswa nenzira mutsara. Iyo Enthalpy H inonyanya kukonzerwa nesimba remukati wemamorekuru, uye chimiro cheMorecular chinokwanisa kuwanda, uye zviri nyore kuburitsa michero. Kunze kwezvo, isu takangofungidzira mamorekuru zana, masimba emamolekora ari pakati peaya anodzvinyirira, asi haana kujairika Molecule, saka Hydrogen chisungo chinobatsira kuvandudza kupesana kunodzidzisa.