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Ibikoresho bya Polyurethane birwanya ubushyuhe bwo hejuru? Muri rusange, Polyurethane ntabwo irwanya ubushyuhe bwo hejuru, ndetse na sisitemu isanzwe ya PPDI, imipaka ntarengwa yubushyuhe irashobora kuba hafi 150 °. Ubwoko bwa polyester cyangwa polyhereher ntibishobora kwihanganira ubushyuhe hejuru ya 120 °. Ariko, Polyurethane ni Polymer Polymer cyane, kandi ugereranije na plastike rusange, birahanganira ubushyuhe. Kubwibyo, gusobanura ubushyuhe bwurugero rwo kurwanya ubushyuhe bwo hejuru cyangwa gutandukanya gukoresha bitandukanye ni ngombwa cyane.
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None se imitunganyirize ya polyurethane ishobora gutezimbere? Igisubizo cyibanze nukumura kristu yibikoresho, nka ppdi isanzwe cyane ppéanate twavuze haruguru. Kuki kongera amatungo ya polymer atezimbere umutekano wacyo? Igisubizo gizwi ahanini kuri buri wese, ni ukuvuga, imiterere igena imiterere. Uyu munsi, turashaka kugerageza gusobanura impamvu iterambere ryimiterere ya molekeri rihora rizana iterambere ryubushyuhe, igitekerezo cyibanze kiva mubisobanuro cyangwa formula yingufu zubusa, ni ukuvuga △ g = H-ST. Uruhande rwibumoso rwa G rwerekana imbaraga zubusa, nuruhande rwiburyo rwigereranya h ni enthalpy, s ni entropy, na t ni ubushyuhe.
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Ingufu zubusa ni igitekerezo cyingufu muri Thermodynamike, kandi ubunini bwacyo akenshi ni agaciro ki hagati yintangiriro no kurangiza imbere yacyo, nkuko agaciro kadashobora kuboneka mu buryo butaziguye cyangwa bugereranywa. Iyo △ g igabanuka, ni ukuvuga iyo ari bibi, bivuze ko imiti ishobora kubaho cyangwa ngo ibe nziza kubitekerezo runaka. Ibi birashobora kandi gukoreshwa kugirango umenye niba reaction ibaho cyangwa ihinduka muri thermodynamic. Impamyabumenyi cyangwa igipimo cyo kugabanya birashobora kumvikana nka kinetike yigisubizo ubwacyo. H ahanini biremewe, bishobora kumvikana nkimbaraga zimbere za molekile. Birashobora gukekwa hafi yubuso bwubuso bwabashinwa, nkuko umuriro utari

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S igereranya entroppi ya sisitemu, muri rusange izwi kandi ibisobanuro bisanzwe birasobanutse neza. Bifitanye isano cyangwa bigaragazwa mubijyanye nubushyuhe t, nibisobanuro byibanze ni urugero rwimvururu cyangwa ubwisanzure bwa microscopique sisitemu nto. Muri iki gihe, inshuti ntoya ishobora kuba yarabonye ko ubushyuhe t bujyanye no kurwanya ubushyuhe turimo kuganira uyu munsi amaherezo byagaragaye. Reka mvunishe gusa kubijyanye n'igitekerezo cya entroy. Entropie irashobora kumvikana nkibinyuranye na kristu. Hejuru agaciro karemereye, niko uruhara kandi akabona akajagari imiterere ya molekelar ni. Isumbabyose imiterere ya molekile isanzwe, ibyiza bya molekile ni. Noneho, reka dukemo kare kare kuri reberi ya polyurethane kandi ufate umwanya muto nkuburyo bwuzuye. Misa yacyo irakosowe, tekereza ko kare igizwe na molekile 100 ya Polyurethane (mubyukuri, mugihe kinini cyane kuri zeru zidahinduka, hanyuma tukagera kuri zeru zidahindutse, hanyuma tukagereranywa na zeru zidahinduka, hanyuma tukagereranywa na zeru zidahinduka, hanyuma tukagera kuri zeru zidahindutse, hanyuma tukagera kuri zeru nyinshi zirashobora guhinduka muri St = H, aho T ni entropie. Ni ukuvuga, kurwanya ubushyuhe bwa polyinethane kare ntoya ninganiye kuri enthalpy h kandi ugereranije na entropy S. Birumvikana ko iyi ari uburyo bugereranijwe, kandi nibyiza kongeramo △ mbere yuko (byabonetse mugereranya).
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Ntabwo bigoye kubona ko iterambere rya kirisiti ridashobora kugabanya agaciro kanini gusa ahubwo ni ukuvuga uburyo bwiza bwo kwiyongera, kandi ni bumwe muburyo bwo kwiyongera. IKIKEZA GUHINDUKA ni uko bisanzwe na kotstallinity byimiterere ya monomer hamwe nibisanzwe muri rusange kandi hakaba haragurika muri molekile nyinshi nyuma yo guterana, bishobora kugereranywa cyangwa kumvikana muburyo bumwe. Enthalpy H ahanini yatanzwe nimbaraga zimbere za molekile, hamwe nimbaraga zimbere za molekile ni ibisubizo bya molekile bitandukanye, kandi birumvikana, kandi biroroshye gutanga ibitekerezo bya molekile bitandukanye, kandi biroroshye gutanga ibitekerezo bya molekile bitandukanye, kandi biroroshye gutanga ibitekerezo bya molekile bitandukanye, kandi biroroshye gutanga ibitekerezo bya molekile bitandukanye, kandi biroroshye kubyara ibintu bitandukanye, kandi biroroshye kubyara ibintu bitandukanye, kandi biroroshye kubyara ibintu bitandukanye, kandi biroroshye kubyara ibintu bitandukanye, kandi biroroshye kubyara ibintu bitandukanye, kandi biroroshye kubyara ibintu bitandukanye, kandi biroroshye gutanga ibintu bya molekile bitandukanye, kandi biroroshye gutanga ibitekerezo bya molekile Byongeye kandi, twafashe molekile 100 gusa, imbaraga za Polyurethane hagati yiyi molekile 100 nazo zizagira ingaruka kumiti igabanya ubushyuhe, nubwo umubare wa hydrogen ya molekili, nubwo badakomeye muri sydrogène yumubiri, nubwo umubare wa hydrogen ya moleclen, nubwo badakomeye muri sydrogène yumubiri, nubwo umubare wa hydrogen nyinshi Molekile, rero hydrogen bond nibyiza kuzamura imitako yubushyuhe.