avaliação das propriedades de misturas de poliestireno com oligômeros de poli(Óxido de propileno) e poliestireno property relationships in blends based on polystyrene

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ID: 241878
1998
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Abstract
Misturas poliméricas de poliestireno (PS1) com poli(óxido de propileno) (PPO) e de poliestireno (PS1) com poliestireno de baixíssima massa molecular (PS2), foram preparadas, em diversas composições, para avaliação das propriedades térmicas, mecânicas e de escoamento. As propriedades térmicas foram avaliadas por calorimetria diferencial de varredura (DSC) e as propriedades mecânicas e de escoamento foram determinadas através de ensaios de tração e monitoração do valor do torque durante o processamento das misturas, respectivamente. Foi observado que o PPO atua como plastificante do poliestireno enquanto que o PS2 não apresenta este comportamento. Entretanto, a adição de ambos os componentes produz mudança no empacotamento molecular, originando o aparecimento de fissuras na superfície dos materiais.
Poly(propylene oxide) (PPO) and polystyrene of lower molecular weight were added to commercial polystyrene. These blends were prepared in a Haake internal mixer and the properties of polystyrene/poly(propylene oxide) and polystyrene/polystyrene of lower molecular weight blends were evaluated using tensile testing, differential scanning calorimetry and torque curves obtained during the process. The results obtained show that PPO acts as a plasticizer for polystyrene, decreasing significantly its torque value and the glass transition temperature. The addition of polystyrene of lower molecular weight to polystyrene causes subtle modifications. However, the addition of both PPO and polystyrene of lower molecular weight to polystyrene probably accelerates crazes formation and it is usually detrimental to the mechanical properties.
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torres1998polmerosavaliao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Maria Andréa P. R. Torres;Michelle T. Telles;Clara Marize F. Oliveira
Journal journal of the chemical society, perkin transactions 1
Year 1998
DOI
10.1590/S0104-14281998000300006
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14281998000300006
Keywords
polystyrene crazeschemical technology

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