1
Kodi zida za poureurethaine ndi zotentha kwambiri? Mwambiri, pounirethane salimbana ndi kutentha kwambiri, ngakhale ndi kachitidwe ka PPDI yokhazikika, kutentha kwake kwakukulu kumatha kukhala pafupifupi 150 °. Mitundu wamba kapena mitundu ya polyter sangathe kupirira kutentha kwambiri kuposa 120 °. Komabe, polyirethane ndi polar polymer yayikulu, ndipo poyerekeza ndi pulasitiki, imatha kugonja kutentha. Chifukwa chake, kufotokozera kutentha kwa kutentha kwa kutentha kwambiri kapena kusiyanitsa magwiritsidwe osiyanasiyana ndikovuta kwambiri.
2
Ndiye kodi kukhazikika kwa matenthedwe kwa ma poliretha kungasinthe bwanji? Yankho loyamba ndikuwonjezera makristallity wazinthuzo, monga PPDI yokhazikika ya PPDI ISOYAMAND yomwe tafotokozayi. Chifukwa chiyani kukulitsa crystalli ya polymer ikusintha kutentha kwake? Yankho lake limadziwika ndi aliyense, ndiye kuti, kapangidwe kake kanipangitse katundu. Masiku ano, tikufuna kuyesa kufotokoza chifukwa chake kusintha kwa kapangidwe kake kumadzetsa kusintha kwa matenthedwe, lingaliro loyambira limachokera kutanthauzo kapena njira ya Gibbs Free mphamvu, mwachitsanzo △ g = h = st. Mbali yakumanzere ya G imayimira mphamvu zaulere, ndipo mbali yakumanja ya equation H Ndi Aglypy, S ndi Endy, ndipo ndi kutentha.
3
Ma Gibbs aulere ndi lingaliro lamphamvu mu thermodynamics, ndipo kukula kwake nthawi zambiri kumakhala kochepa, ndikusinthana pakati pa zoyambira, kotero chiphiphiritso △ sichitha kukhala patsogolo pake, choyimiridwa. Pamene id Izi zitha kugwiritsidwanso ntchito kudziwa ngati zomwe zikuchitikazo zimakhalapo kapena zimasinthidwa mu thermodynamics. Mulingo kapena kuchuluka kwa kuchepetsa kumatha kumveka ngati achifwamba a zomwe zidachitika. H yaimbidwanso, yomwe ingamveke bwino ngati mphamvu yamkati ya molekyulu. Imatha kunenedwa motere chifukwa cha tanthauzo la zilembo zaku China, ngati moto mulibe

4
S imayimira cholembera cha dongosolo, lomwe limadziwika ndipo tanthauzo lenileni limamveka bwino. Ndizokhudzana ndi kapena kufotokozedwa malinga ndi kutentha T, ndipo tanthauzo lake loyambirira ndi kuchuluka kwa matenda kapena ufulu wa microscopic yaying'ono. Pakadali pano, bwenzi laling'onoli lingaone kuti kutentha kumakhudzana ndi kuchuluka kwa mafuta omwe tikukambirana lero. Ndiroleni ndingoyambira lingaliro lolowera. Kulowera kumatha kumvedwa mopusa ngati kosiyana ndi crystality. Chofunika kwambiri, kusokonekera komanso kusokonekera kwambiri kwa ma molecular. Kukhazikika kwa ma molecular, kumalikola kwa crystality ya molekyulu ndi. Tsopano, tiyeni tidulire bwalo laling'ono kuchokera ku rabara ya polyurethane ndikuwona lalikulu laling'ono ngati dongosolo lathunthu. Unyinji wake umakhazikika, kungoganiza kuti lalikulu limapangidwa ndi mamolekyu a ma polyirethane (malinga ndi mitundu ya ma polints (motero, pomwe pali ma qubble ocheperako, h, ndiye kuti ndi wolowererapo. Ndiye kuti, kukana kwamafuta a polyurethane kumaphatikizika kwa Highdwar H komanso mofananira ndi affy s. Inde, iyi ndi njira yofananira.
5
Sikovuta kudziwa kuti kusintha kwa curstallent sikungathe kuchepetsa phindu komanso kuwonjezera mtengo wopititsa patsogolo ma teniya (T = H / S) kutentha kwagalasi kapena kutentha kwagalu. Zomwe zikufunika kusinthidwa ndikuti nthawi zonse ndi makiyile a monomer molecular mawonekedwe ndi ma crystallity ya okhazikika kwambiri pambuyo poyerekeza, yomwe imatha kukhala yofanana kapena yofananira munjira ya mzere. Okakamiza h amathandizidwa makamaka ndi mphamvu zamkati, ndipo mphamvu yamkati ya molecular imachitika chifukwa chazomwe zimatheka ndi mankhwalawa. Kupatula apo, tinkangoganiza za mamolekyu a anthu 100, kulumikizana kumayambitsa mamolekyume 100 awa kungakhudzenso kukana kwa ma hydrogen, koma osalimbana ndi ma hydrogen Moleky, kotero Hydrogen Compend ndi yopindulitsa kukonza mphamvu yamatenthedwe.