Effect of sisal fiber filler on thermal properties of bio-based polyurethane composites

Abstract

This work is mainly focused on study of thermal and thermomechanical properties of obtained bio-based polyurethane (coded as bio-PU) composites via using different types of bio-components (bio-glycol, modified soybean oil and sisal fiber) in the procedure. The chemical structure, morphology and mechanical properties were also investigated and described in this manuscript in order to know more perfect characterization of produced composites. The bio-based polyurethane matrix of composites was synthesized via prepolymer method. Bio-PU composites were produced by dispersing 5 and 15 mass% of sisal fibers into the polyurethane matrix during their synthesis. To investigate the thermal stability of sisal fibers and bio-PU composites, the thermogravimetric method (TG) was used. Thermomechanical tests were performed by means of dynamic mechanical analysis (DMA). Based on the results of thermomechanical analysis, it was found that the sisal fibers amount has the impact on storage and loss modulus. Chemical structure was confirmed by FTIR spectra. Mechanical results and scanning microscopy images of the composites showed good interfacial adhesion between sisal fibers and the bio-based PU matrix.

Eco-friendly Route for Thermoplastic Polyurethane Elastomers with Bio-based Hard Segments Composed of Bio-glycol and Mixtures of Aromatic–Aliphatic and Aliphatic–Aliphatic Diisocyanate

“…In this work, TGA was used to indicate the differences in thermal properties of partially bio-based thermoplastic polyurethane elastomers obtained using diisocyanates mixtures and determine the onset of thermal decomposition of obtained materials. Mostly, the thermal decomposition in the case of PUs occurs in two main steps and is related with the dissociation of urethane group and polyol residue and also pointed on the phase separation in the material [ 7 , 27 ]. The onset and rate of the decomposition depend on many factors such type of used substrates in the synthesis of PU and their molar ratio.…”

“…On the basis of storage modulus (E′) the amount of energy accumulated in material and its stiffness can be defined. Loss modulus (E″) informs about energy dissipated as a heat and loss factor (tanδ) provides information about the macromolecular mobility [ 27 ]. Plots of storage modulus (E′), loss modulus (E″) and tanδ as a function of temperature were presented in Figs.…”

“…6 ). It is connected with better dumping properties of this material [ 27 ]. On the basis of maximum of loss factor, glass transition temperatures (T g ) of soft segments of polyurethanes were determined.…”

A comparative study on selective properties of Kraft lignin–natural rubber composites containing different plasticizers

“…The lowest value (−44 °C) was determined for the naphthenic oil-based reference sample. The value of tan δ is correlated with the degree of crosslinking density of the macromolecular chains [43]. The decreasing trend with growing filler content in the composites suggested the decline in the crosslinking in the prepared materials.…”

Flame Retardancy of Bio-Based Polyurethanes: Opportunities and Challenges

“…The development of bio-based PUs using bio-based/renewable isocyanates and/or polyols has also attracted the interest of academic and industrial researchers [ 15 , 16 , 17 , 18 , 19 ]; accordingly, several review papers have been published that rely on such a necessity [ 20 , 21 , 22 ]. Moreover, the development of isocyanate-free PU-based materials has been recognized as an efficient approach to avoid the toxicity issues associated with the use of isocyanates.…”