Uticaj dodatka poli(dialildimetilamonijum hlorida) na kinetiku očvršćavanja urea-formaldehidnog adheziva za ploče iverice Naučni rad
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U ovom radu ispitan je uticaj dodatka poli(dialildimetilamonijum hlorida) (PDDA) na performanse urea-formaldehidnog (UF) adheziva. U tom cilju pripremljene su tri serije UF adheziva: bez dodatka PDDA i sa dodatkom PDDA od 1 i 3 % suve supstance po masi suve supstance adheziva. Dodatak PDDA smanjio je debljinsko bubrenje uzoraka eksperimentlano dobijenih ploča iverica, dok je zatezna čvrstoća upravno na površinu ploče značajno povećana tek pri dodatku PDDA od 3 %. Metoda diferencijalne skeirajuće kalorimetrije (engl. differential scanning calorimetry, DSC) primenjena je u cilju ispitivanja uticaja dodatka PDDA na kinetiku očvršćavanja UF adheziva. DSC merenja sprovedena su u dinamičkom režimu korišćenjem različitih brzina zagrevanja (5, 10 i 20 °C∙min−1). Povećanje koncentracije PDDA uticalo je na smanjenje vrednosti energije aktivacije očvršćavanja UF adheziva, izračunate po opštem Kisindžerovom modelu. Zavisnost energije aktivacije u odnosu na stepen konverzije određena je za sva tri ispitivana adhezivna sistema korišćenjem izo-konverzionih modela (Kissinger-Akahira-Sunose i Friedman), što je omogućilo detaljniji uvid u uticaj PDDA na tok reakcije očvršćavanja UF adheziva.
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