Synthesis and characterization of poly(vynil-alcohol) by the alcoholysis of poly(vinil-acetate) : bachelor thesis
| Autor: | Jankov, Ivona |
|---|---|
| Přispěvatelé: | Jakić, Miće |
| Jazyk: | chorvatština |
| Rok vydání: | 2020 |
| Předmět: |
thermogravimetric analysis
poli(vinil-acetat) poli(vinil-alkohol) TEHNIČKE ZNANOSTI. Kemijsko inženjerstvo TECHNICAL SCIENCES. Chemical Engineering termogravimetrijska analiza poli(vinyl-alcohol) diferencijalna pretražna kalorimetrija poli(vinyl-acetate) differential scanning calorimetry infrared spectroscopy infracrvena spektroskopija |
| Popis: | U ovom radu sintetiziran je poli(vinil-alkohol) (PVAL) alkoholizom poli(vinil-acetata) (PVAC) te je napravljena karakterizacija sintetiziranog i izvornog (kupljenog) PVAL-a pomoću infracrvene spektroskopije s Fourierovom tranformacijom (FT-IR) koja je primijenjena za potvrdu strukture polimera, odnosno uspješnosti sinteze PVAL-a alkoholizom poli(vinil-acetata), zatim diferencijalnom pretražnom kalorimetrijom (DSC) koja daje uvid u toplinska svojstva PVAL-a i termogravimetrijskom analizom (TG) s kojom se dobije uvid u toplinsku razgradnju PVAL-a. Usporedbom FT-IR spektrograma izvornog i sintetiziranog PVAL-a dobiven je koeficijent korelacije 89,5%. Te vrijednosti nisu dovoljno velike da bi potvrdile da se zaista radi o PVAL-u, međutim, prikazuju karakteristične vibracijske vrpce za čisti PVAL s blagim odstupanjem čime se dokazuje da je PVAL uspješno sintetiziran. DSC normaliziranim krivuljama potvrđeni su zaključci dobiveni FT-IR-om, ali temeljem vrijednosti staklišta, kristališta i tališta. Preklapanjem DTG krivulja dolazi se do istog zaključka, bliski rezultati u razgradnim stupnjevima potvrđuju da je sinteza PVAL-a alkoholizom PVAC-a uspješno provedena. In this paper poly(vinyl alcohol) (PVAL) was synthesized by the alcoholysis of poly(vynil acetate) (PVAC) and characterization of synthesized and original (purchased) PVAL was preformed using infrared spectroscopy with Fourier transform (FT-IR) which was applied to confirm the structure of the polymer or the success of the synthesis PVAL by the alcoholysis of PVAC, followed by differential scanning calorimetry (DSC) which gave an insight into the thermal properties of PVAL and thermogravimetric analysis which gives an insight into thermal decomposition of PVAL. By comparing FT-IR spectrograms of original and synthesized PVAL, correlation coefficient 89,5% was obtained. These values are not large enough to confirm that it is indeed PVAL however they show the characteristic vibration bands for pure PVAL with a slight deviation thus proving that PVAL has been succesffully synthesized. DSC normalized curves confirm the conclusions obtained by FT-IR but based on the glass, crystal and melting point. By overlapping the DTG curves the same conclusion was reached, close results in the degradation steps confirm that the synthesis of PVAL by the alcoholysis of PVAC was successfully implemented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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