Development of environmentally friendly composite matrices from epoxidized cottonseed oil

Abstract

The continuous rise in oil prices has led to the use of other ways to obtain polymer materials. This paper proposes a methodology to obtain a thermosetting resin from cottonseed oil by epoxidation process. The cottonseed oil contains as most representative fatty acids: 52.5% of linoleic acid (C18: 2), 23.9% of palmitic acid (C16: 0) and 17.6% of oleic acid (C18: 1); the real iodine index, which is indicative of the number of double bonds, has a value of 107. Epoxidized cottonseed oil (ECSO) has been successfully obtained using conventional epoxidation process with hydrogen peroxide, acetic acid and sulfuric acid, maintaining a constant temperature of 70 ºC with homogeneous magnetic stirring. Average oxirane oxygen content (OOC) of 5.32% can be obtained by conventional epoxidation process which represents a yield over 83%. The epoxidized oil has been crosslinked with mixtures of two cyclic anhydrides to tailor different properties on final crosslinked thermosetting resins: on the one hand, methyl nadic anhydride (MNA) which is characterized by a rigid molecular structure and on the other hand, dodecenylsuccinic anhydride (DDSA) with a long side chain that can confer flexibility. The crosslinking process has been followed by dynamic differential scanning calorimetry (DSC), ionic mobility and oscillatory rheometry (OR) as well as gel time determination.The effect of the hardener mixture (wt. % DDSA:MNA) on mechanical performance of cured materials has been followed by flexural and impact tests as well as the evolution of the storage modulus (G') by dynamic mechanical analysis (DMA) in torsion mode. By selecting the appropriate hardener mixture, it is possible to obtain crosslinked materials with different properties ranging from

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“…Joncryl ® ADR-4368 was supplied by BASF S.A (Barcelona, Spain) and is characterized by a T g of 54°C, an epoxy equivalent weight of 285 g·mol -1 and a molecular weight, M w of 6800 g·mol -1 . The cottonseed oil was subjected to epoxidation [40] and maleinization as reported in previous works [37]. The most relevant parameters obtained after the corresponding chemical processes are as follows.…”

Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid)

“…These epoxidized vegetable oils can be successfully used as high environmentally friendly epoxy resins [27][28][29][30] as well as plasticizers for poly(vinyl chloride), PVC industrial formulations due to its high compatibility with PVC resins [31][32][33][34][35]. Epoxidized vegetable oils also have been used as plasticizers for PLA.…”

Preparation and Characterization of All-Biomass Soy Protein Isolate-Based Films Enhanced by Epoxy Castor Oil Acid Sodium and Hydroxypropyl Cellulose

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