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Open AccessArticle

The Use of Cashew Nut Shell Liquid (CNSL) in PP/HIPS Blends: Morphological, Thermal, Mechanical and Rheological Properties

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Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, 2.300 Horácio Macedo Av., Technology Center, Building J, 21941-598 Rio de Janeiro, RJ, Brazil
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Programa de Engenharia Ambiental (PEA/UFRJ), Universidade Federal do Rio de Janeiro, 149 Athos da Silveira Av., Technology Center, Building J, 21941-909 Rio de Janeiro, RJ, Brazil
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Escola de Química, Universidade Federal do Rio de Janeiro, 149 Athos da Silveira Av., Technology Center, Building E, 21941-611 Rio de Janeiro, RJ, Brazil
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Department of Chemical Processes, Universidade do Estado do Rio de Janeiro, 524 São Francisco Xavier, 20550-900 Rio de Janeiro, RJ, Brazil
*
Author to whom correspondence should be addressed.
Materials 2019, 12(12), 1904; https://doi.org/10.3390/ma12121904
Received: 14 May 2019 / Revised: 7 June 2019 / Accepted: 10 June 2019 / Published: 13 June 2019
(This article belongs to the Special Issue Environmentally Friendly Polymers and Polymer Composites)
Polypropylene (PP) and high impact polystyrene (HIPS) are two polymers that are frequently found in disposable waste. Both of these polymers are restricted from being separated in several ways. An easier way to reuse them in new applications, without the need for separation, would require them to be less immiscible. In this work, cashew nut shell liquid (CNSL), a sub-product of the cashew agroindustry, was added as a third component to PP-HIPS mixtures and its effect as a compatibilizing agent was investigated. Morphological results showed that CNSL acted as an emulsifier by promoting reduction in the domains of the dispersive phase, HIPS, thus stabilizing the blends morphology. Differential scanning calorimetry (DSC) analysis suggests that CNSL is preferably incorporated in the HIPS phase. Its plasticizing effect leads to more flexible materials, but no significant effect could be detected on impact resistance or elongation at break. View Full-Text
Keywords: polymer mixtures; blends; cashew nut shell liquid (CNSL); polypropylene; high impact polystyrene; compatibilization polymer mixtures; blends; cashew nut shell liquid (CNSL); polypropylene; high impact polystyrene; compatibilization
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Araújo, M.N.; Visconte, L.L.Y.; Barreto, D.W.; Escócio, V.A.; Silva, A.L.N.; Sousa, A.M.F.; Pacheco, E.B.A.V. The Use of Cashew Nut Shell Liquid (CNSL) in PP/HIPS Blends: Morphological, Thermal, Mechanical and Rheological Properties. Materials 2019, 12, 1904.

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