Preparo e caracterização de blendas de PVP/PAADDA / Preparation and characterizaion of PVP/PAADDA blends

Maria Eduarda Escocard Consendey, Gustavo de Gusmão Celestino, Ana Lucia Shiguihara, Jorge Amim Junior

Abstract


O objetivo desse trabalho foi preparar e caracterizar filmes da blenda de polivinilpirrolidona (PVP) e poliacrilamida-co-dialildimetilamônio (PAADDA) usando a técnica de evaparação do solvente. A miscibilidade entre o PVP e o PAADDA  foi investigada através de medidas de viscosidade, espectroscopia vibracional na região do infravermelho (FTIR), difração de raios X (DRX), análise termogravimétrica (TGA) e calorimetria exploratória de varredura (DSC). Os resultados de viscosidade mostraram que o PVP e o PAADDA são miscíveis em solução aquosa. Os espectros de infravermelho exibiram as principais bandas dos  polímeros nos filmes das blendas. Os resultados de DRX mostraram que o PAADDA diminui a cristalinidade do PVP. As curvas TGA mostraram que o PAADDA promove uma diminuição da temperatura inicial de degradação (Tonset) do PVP. Além disso, os resultados de DSC revelaram que o PAADDA atua como plastificante para o PVP.


Keywords


blenda, PVP, PAADDA.

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DOI: https://doi.org/10.34117/bjdv7n10-18

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