Study of phenolic resin/EVA blends by thermal analysis |
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Authors: | C. G. Mothé M. I. B. Tavares |
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Affiliation: | (1) Escola de Química da Universidade Federal do Rio de Janeiro, Centro de Technologia, Cidade Universitária, Ilha do Fundao, CP 68522, Cep 21949-900, Brazil;(2) Instituto de Macromoléculas Professora Eloisa Mano da Universidade Federal do Rio de Janeiro, Centro de Technologia, Cidade Universitária, Ilha do Fundao, CP 68525, Cep 21945-970 RJ, Brazil |
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Abstract: | The properties of polymeric blends originate from the synergistic association of their components. In this investigation, phenolic resins obtained by the reaction of cashew-nut shell liquid (CNSL) and aldehyde are used in several applications. Mixtures of CNSL with industrial reject ethylene-co-vinyl acetate (EVA reject) were prepared with an EVA reject content up to 70%. The thermal compatibility and stability were evaluated by means of thermogravimetry (TG), derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC). For blends containing a high percentage of EVA reject, the TG curves clearly show two decomposition stages, one at 350C and the other at 450C (onset 467C). The DIG curves of the blend containing 70% CNSL exhibit decomposition at 240C. The DSC curves show that the samples containing a high percentage of EVA reject are incompatible, withTg values around –30C.The authors would like to thank PETROBRAS/CENPES/DIQUIM for the NMR facilities and thermal measurements. |
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Keywords: | DSC EVA blends phenolic resin TG-DTG |
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