Physical and mechanical properties of a vegetable oil based nanocomposite

Buffa, Juan Manuel; Mondragón, Gurutz; Corcuera, María Ángeles; Eceiza, Arantxa; Mucci, Verónica Luján; Aranguren, Mirta I.

doi:10.1016/j.eurpolymj.2017.10.035

Cited by 27 publications

(12 citation statements)

References 47 publications

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“…The authors showed that an increasing content of CNC produces an increase of the C=O bond absorption at least up to the CNC percolation [ 18 ]. Minor changes were also reported for a similar composite in the ~1530 cm −1 region [ 83 ]. This report is in agreement with the shifts in the amide I and amide II regions observed in the present work.…”

Section: Resultssupporting

confidence: 54%

Nanocelluloses Reinforced Bio-Waterborne Polyurethane

et al. 2021

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The aim of this work was to evaluate the influence of two kinds of bio- nano-reinforcements, cellulose nanocrystals (CNCs) and bacterial cellulose (BC), on the properties of castor oil-based waterborne polyurethane (WBPU) films. CNCs were obtained by the acidolysis of microcrystalline cellulose, while BC was produced from Komagataeibacter medellinensis. A WBPU/BC composite was prepared by the impregnation of a wet BC membrane and further drying, while the WBPU/CNC composite was obtained by casting. The nanoreinforcement was adequately dispersed in the polymer using any of the preparation methods, obtaining optically transparent compounds. Thermal gravimetric analysis, Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, dynamical mechanical analysis, differential scanning calorimetry, contact angle, and water absorption tests were carried out to analyze the chemical, physical, and thermal properties, as well as the morphology of nanocelluloses and composites. The incorporation of nanoreinforcements into the formulation increased the storage modulus above the glass transition temperature of the polymer. The thermal stability of the BC-reinforced composites was slightly higher than that of the CNC composites. In addition, BC allowed maintaining the structural integrity of the composites films, when they were immersed in water. The results were related to the relatively high thermal stability and the particular three-dimensional interconnected reticular morphology of BC.

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Section: Resultssupporting

confidence: 54%

Nanocelluloses Reinforced Bio-Waterborne Polyurethane

et al. 2021

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“…We understood these results by taking into account the molecular structure of each polymer. For ESO, the fact that it had a very high content of monomeric species implied the formation of a preponderant thermal transition, which was studied before by several researchers . On the other hand, the polyols presented a more polydispersive molecular structure; hence, it was logical to measure several thermal transitions associated with the nature of each oligomeric species.…”

Section: Resultsmentioning

confidence: 99%

Highly functional lactic acid ring‐opened soybean polyols applied to rigid polyurethane foams

Herrán

Amalvy

Chiacchiarelli

2019

J of Applied Polymer Sci

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We synthesized polyols with high hydroxyl functionalities (F OH s), between 9.0 and 12.6, and characterized them with differential scanning calorimetry, thermogravimetric analysis, and size exclusion chromatography after we parametrically studied the ringopening reaction of epoxidized soybean oil with lactic acid (LA) as a function of the reaction temperature and lactic acid equivalent fraction (f LA ). An increase of only 20 C in the reaction temperature (from 80 to 100 C) caused changes in the hydroxyl number (+17.8%), F OH (-25%), viscosity (-14.0%), and oligomeric content (-24.1%). f LA mostly affected the ring-opening yield, and only for f LA values above 0.4 was possible to achieve values higher than 80%. Rigid polyurethane foams (rPUFs) were synthesized and characterized with scanning electron microscopy, dynamic mechanical analysis (DMA), and compressive mechanical tests. rPUFs with a very high specific compressive strength (7.8 kPa kg -1 m 3 ) were synthesized solely with biobased soybean oil. DMA revealed a compromised relationship between the specific compressive strength and its temperature dependence. To increase the first one, the most relevant method was to increase F OH . Instead, to increase the latter one, the OH number had to be maximized.

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“…[47] However, as the addition of ACNCs continued to increase, hydrogen bonds between ACNCs and CPBAT were formed, which could restrict the molecular mobility of CPBAT and result in the reduction of T c . [48,49] Clearly, the χ c decreased with the addition of ACNCs, for reason that the rigid ACNCs nanoparticles restricted the rearrangement of the CPBAT molecular chains, which could be proved by some reported works. [34,50] As shown in Figure 4(B), there was a little effect on T m of torqued PBAT by the incorporation of CE.…”

Section: Crystallization and Melting Behaviorsmentioning

confidence: 61%