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Biodiesel from soybean oil, castor oil and their blends
Oxidative stability by PDSC and rancimat
and their blends. This study aims at evaluating the thermal and oxidative stability of the ethylic biodiesel of soybean oil (BES), of castor oil (BEM) and their blends (BSM X —where X is the percentage of BEM in the blend) using PDSC and
production of biodiesel and to the improvement of synthesis process [ 1 – 4 ]. Biodiesel blends have been tested; however, the diversity of raw materials and technological routes employed in the biodiesel production has resulted in products with
, the unsatisfactory properties of the green polymers can be significantly modified when blended with others polymers [ 1 – 5 ]. PHAs with short side chains are associated with higher crystallite, narrow processing windows, and a relatively higher
Introduction Polymeric blends have been studied for making possible significant modifications in the traditional properties of synthetic polymers [ 1 , 2 ]. For instance, the poly(vinylidene fluoride), PVDF, and its copolymer
Abstract
A series of blends of dodecylbenzenesulfonic acid (DBSA)-doped polyaniline (PANDR) and PVC were synthesized by solution blending technique and investigated by heatflow microcalorimetry (HFC) for thermal and oxidative stability and for PVC–PANDR compatibility. FTIR results provided evidence for strong dipole–dipole interactions between PANDR and PVC. The energy of the oxidation is independent of the composition. The interaction energy and thermal stability increased with the increase of PANDR content in the blend. The activation energies calculated by using Arrhenius relationship can be employed for accelerated ageing of the synthesized blends. It has been observed that the average degradation of PANDR component is higher than that of PVC.
Starch plasticized with glycerol from biodiesel and polypropylene blends
Mechanical and thermal properties
Abstract
Plastics have been used in short-life products, which have presented harmful consequences for the nature, due to the low degradation rate reached by the most common polyolefins, such as the polypropylene. By this way, the incorporation of pro-oxidants has been shown nice results to the bio-assimilation of the common polymers. The aim of this study is to evaluate the mechanical and thermal properties of pure iPP, plasticized starch (TPS) with biodiesel glycerol (TPSBio) or commercial glycerol (TPSCom), and their blends (iPP/TPSPlas). TPS was plasticized in proportions of 80/20 (wt starch/wt glycerin). Blends of iPP/TPSPlas were obtained by extrusion in the following composition rates: 95/5, 90/10, 80/20, and 70/30 of modified PP/TPSPlas. Mechanical properties, calorimetric analysis, and thermogravimetric data were obtained, and biodegradation under simulated soil was performed. It can be verified that there were no meaningful variation induced by the incorporation of TPSPlas on the melting temperature on the blends, when compared to pure iPP. The addition of TPSPlas caused an increasing on the crystallinity of iPP, mainly for the compositions 90/10 and 80/20 of iPP/TPSPlas, probably due a morphological alteration such as crosslinking, which may have modified the molecular arrangement of the iPP macromolecules by the presence of glycerol, which was also indicated by mechanical evaluations.
Abstract
Plastics have been used in short-life products, which have presented harmful consequences for the nature, because of the low degradation rate reached by the most common polyolefins. This work evaluates the mechanical and thermal properties of pure iPP, plasticized starch (TPS) with biodiesel (TPSBio) or commercial (TPSCom) glycerols, and their blends (iPP/TPSPlas). The addition of TPSPlas caused an increasing on the cristallinity of iPP, mainly for the compositions 90/10 and 80/20, probably due to morphological alterations such as crosslinking, that may have modified the molecular arrangement of the iPP in the presence of glycerol.
energy, and high thermal stability, PDMS is a desirable blend component [ 13 , 14 ]. One blend system containing PDMS that received much attention in literature is with polystyrene (PS), often in combination with PS-b-PDMS block copolymers as
]. The aim of this article is to study the heat of combustion of soybean oil, biodiesel and diesel-like produced from soybean oil and diesel/biofuels blends by using a bomb calorimetry. Experimental Chemicals and
Introduction Thermal degradation and dynamic mechanical behavior of polymers and polymer blends are very important to predicting their suitability in the specific field of applications. Knowledge of degradation and mode of
