Polyurethane Dispersions Research Articles

Hybrid and biocompatible cellulose/polyurethane nanocomposites with water-activated shape memory properties

Water-activated shape memory bacterial cellulose/polyurethane nanocomposites were prepared by the immersion of bacterial cellulose (BC) wet membranes into waterborne polyurethane (WBPU) dispersions for different times. The high affinity between the hydrophilic BC and water stable polyurethane led to the coating and embedding of the BC membrane into the WBPU, facts that were confirmed by FTIR, SEM and mechanical testing of the nanocomposites. The mechanical performance of the nanocomposites resulted enhanced with respect to the neat WBPU, confirming the reinforcing effect of the BC membrane. An improvement of the shape fixity ability and faster recovery process with the presence of BC was observed. In 3 min, the nanocomposite with highest BC content recovered the 92.8 ± 6.3% of the original shape, while the neat WBPU only recovered the 33.4 ± 9.6%. The obtained results indicated that 5 min of impregnation time was enough to obtain nanocomposites with improved mechanical performance and fast shape recovery for potential biomedical applications. The present work provides an approach for developing environmentally friendly and biocompatible BC/polyurethane based materials with enhanced mechanical and shape memory properties.

Исследование антибактериальной резистентности алифатических четвертичных аммониевых солей в полиуретановых дисперсиях

In this work we investigated the possibility of using different structures of biocides to detect the stability of dispersion and the antibacterial properties of polyurethane water-dispersion coatings to combat the negative impact on materials, bio-damage, which can affect the quality of the human environment. This allows the use of polyurethane aqueous dispersions, where the constancy of aseptic conditions of quality is combined with good properties of polyurethane coatings. The oasheaters have been used in the first year of the 19th century to reduce the number of people. Coatings used dispe6rsionnye water-based polyurethane dispe6rsii complex poliefrov different structure (polietilenglikoladipinat, polietilenbutilenglikoladipinat, and polibutilenglikoladipinat polidietilenglikoladipinat) 2,4-diisocyanate, ionic agent and chain extenders, at a concentration of dry matter of 20-50% by weight. One of the most commonly used methods for determining the activity of antimicrobial agents is the method of diffusion of substances into agar. Evaluation of the activity of antimicrobial agents by this method is carried out according to the diameter of the zone of inhibition of growth of microorganisms (Escherichia Colli and Bacillus subtilis) on the surface of the substrate. As a result of the research, it was revealed that the actions of the used antimicrobial agents can be arranged in the following order: alkyltrimethylammonium chloride > didecyldimethylammonium chloride > dialkyldimethylammonium chloride. Maximum concentrations of biocides were found at which polyurethane dispersions are stable and do not coagulate: for quaternary amine compounds with one alkyl, the maximum permissible concentration is 10%, with dialkyl the maximum permissible concentration is 7.5%, with trialkyl the maximum permissible concentration is 3%. The increase in the diameter of the suppression of the growth of microorganisms is also influenced by the concentration of the polyurethane dispersion, which makes it possible to introduce antibacterial compounds much more.

High Biobased Carbon Content Polyurethane Dispersions Synthesized from Fatty Acid-Based Isocyanate

A series of high biobased carbon content polyurethane dispersions (PUD) was successfully synthesized from dimer fatty acid diisocyanate (DDI), castor oil (CO), alkoxysilane-modified castor oil (MCO), and dimethylolpropionic acid (DMPA). This work focused on the improvement for the final performance of the renewable DDI-based PUD as well as the discussion of structure/property relationships. The chemical structure of MCO and Si–O–Si cross-link network structure on the dry-film of PUD were characterized by Fourier-transform infrared spectroscopy (FTIR) and solid-state 29Si NMR. The effect of alkoxysilane and NCO/OH ratio on DDI-based PUD were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile tests, and electrochemical impedance spectroscopy (EIS). The glass transition temperature, Young’s modulus, and tensile strength increased with the incorporation of alkoxysilane and increasing NCO/OH ratio. In the meanwhile, the initial degradation temperature and elongat...

Synthesis of waterborne polyurethane using snow as dispersant: Structures and properties controlled by polyols utilization

Waterborne polyurethane (WPU) dispersions have gained attention towards environmentally-friendly synthesis. In this article, a series of waterborne polyurethane emulsions was successfully synthesized and extensively characterized in terms of thermal, mechanical properties, hydrophilic behavior and morphology. Snow was chosen as dispersant instead of commonly used water. Preparation parameters such as intrinsic properties and molecular weight of polyols were discussed systematically. A chain structure was confirmed by Fourier transform infrared (FT-IR) spectroscopy. When comparing the nature of the polyols (PPG, PEG and PNA, 2000 g/mol) of this study, as-synthesized polyether waterborne polyurethane provided higher solid content, viscosity and water-resistance. However, polyester waterborne polyurethane performed differently and it exhibited higher thermal stability and crystallinity. When comparing the samples (WPU-N210, WPU-N220, WPU-N230 and WPU-N240) with different molecular weight of the same polyol (PPG) used as soft segment, the emulsion WPU-N220 with molecular weight of 2000 g/mol PPG provided the highest solid content and lowest viscosity. It was observed that particle size was uniform and highly dispersed for all samples from TEM images. Thermogravimetric, differential scanning calorimetry (DSC) and X-ray diffraction results demonstrated that the emulsion WPU-N230 with molecular weight of 3000 g/mol PPG possessed higher thermal stability and crystallinity than the other samples. The reason was that the Tg and thermal stability were increased with increasing molecular weight. When molecular weight increased, the arrangement of soft segment became more regular and so did the regularity of the molecular chains. This work demonstrated that different polyols as soft segment applied could lead to great differences in the structure and property of the resulting WPU.

Preparation of polyurethane ionomers by reactive extrusion and dispersions containing sulfonate groups and polyethylene glycol segments

ABSTRACTA synthesis method of polyurethane ionomers (PUIs) and anionic/nonionic polyurethane dispersions (PUDs) is introduced in this article. PUIs were synthesized in twin‐screw extruder without organic solvent. PUIs were then dissolved in acetone and dispersed in water. The PUDs were obtained after distilling off acetone and the solid content of PUDs was about 55% and had excellent stability. PUDs obtained were mainly used as adhesives. PUIs were synthesized from poly(1,4‐butylene adipate glycol) (PBA) as soft segments, 1,4‐butanediol (BDO) and diphenylmethane diisocyanate‐50 (MDI‐50) as hard segments, poly(ethylene glycol) methyl ether (MPEG) and polyether diol‐containing sulfonate (SPPG) as hydrophilic monomers, and dibutyltin dilaurate (DBTDL) as catalyst. The particle size, viscosity, and adhesive properties of the PUDs were measured and the results indicated that PUDs obtained have excellent stability and adhesive properties, such as the maximum initial peel strength and T‐peel strength were 2.38 and 11.82 N mm−1, respectively. The thermal properties, tensile stress–strain, and water resistance of the PUIs films were also characterized. The test results showed that films have good thermal properties and water resistance properties, and some typical characteristics of crystalline polymers were revealed in the tensile stress–strain curves. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47719.

Emulsion stability and water tolerance of cationic waterborne polyurethane with different soft segment ratios between trifunctional polyether and bifunctional polyester

A series of cationic waterborne polyurethanes (WPU) was prepared using isophorone diisocyanate (IPDI) as the hard segment and polyester diol (PE2348), polyether triol (ZC330) or their mixture as the soft segment. The effects of the content of PE2348 and ZC330, crosslinking density on the particle size and its distribution, stability of WPU emulsion and the thermosstability, mechanical properties of WPU membrane were investigated. The results indicated that the increase of PE2348 in the mixed soft segment contributes to inhibiting the hydration, and the average particle size of the emulsion decreased because of the same cause. However, the stickiness of the corresponding film was increased and the elasticity deteriorated too. Structure uniform and suitable hydrophilicity of soft segment contributed to the stability, and higher crosslinking degree will contribute to the water-impregnation resistance of cationic waterborne polyurethanes membrane. Moderate hydrophilicity of polyurethane molecules and uniform distribution of hydrophilic structure are beneficial to uniform dispersion of polyurethane and better emulsion stability. If the miscibility between soft segments and hard segments and between the different soft segments is better, water resistance of the membrane will be improved significantly.

Preparation and Properties of Hydrophilic Rosin-Based Aromatic Polyurethane Microspheres

Hydrophilic aromatic polyurethane (HAPU) microspheres were prepared through dispersion polymerization of a rosin-based polyurethane dispersion with C=C and styrene (St). The effects of the monomer ratio (i.e., waterborne rosin-based aromatic polyurethane (WRPU) to St), dispersant level, and reaction temperature on the properties of the microspheres were investigated; the effects of pH and adsorption temperature on the adsorption capacity of Orange II were also studied. The microspheres were characterized using Fourier transform infrared spectroscopy, energy-dispersive spectrometry, thermogravimetric analysis, laser particle size analysis, and scanning electron microscopy. The results showed that HAPU microspheres have been successfully synthesized and the produced microspheres exhibited good thermal stability and monodispersion. The optimum reaction conditions for the preparation of the microspheres were determined as a monomer ratio (mWRPU/mSt) of 6:4 with 8 wt % poly(vinyl pyrrolidine) (on the basis of the mixed monomer) at 80 °C for 8 h. Under these conditions, the average particle size of the synthetic microspheres was 120 nm and the particle size distribution index was 0.442. The microspheres’ adsorption capacity for Orange II reached 17.53 mg·g–1 when the solid–liquid ratio was 1 g·L–1, with an initial concentration of 100 mg·L–1 at pH 5, and the adsorption was conducted at 313 K for 3 h.

Modified bitumen emulsion by anionic polyurethane dispersion nanocomposites

Different materials and compounds were used for improving mechanical and rheological properties of bitumen. Replacing the traditional bitumen by emulsion bitumen is increasing due to reduced environmental pollution. In recent years, emulsion bitumen modification has been considered to obtain higher efficiency bitumen with water-dispersible polymers. For this purpose, this study intends to investigate the modification of emulsion bitumen using water-dispersible anion polyurethane nanoclay nanocomposite. Since the polymer elasticity property plays an important role in bitumen modification and its properties, anionic polyurethane with different elastic properties was prepared by changing its structure, and its effects on modifying bitumen emulsion were investigated. Preliminary tests of bitumen properties and rheological behaviour analysis were performed on the prepared samples. The results of the tests showed that the penetration-modified bitumen decreased and softening point increased. As the structure of modifier changes, the rheological behaviour of bitumen is improved and changes from viscous to elastic one.

One pot stimuli-responsive linear waterborne polyurethanes via Diels-Alder reaction

Different strategies were used to obtain waterborne polyurethanes containing Diels-Alder moieties. In the first one (two pot), furan and maleimide end capped waterborne polyurethane dispersions were synthesized with the aim of obtaining a stimuli-responsive material after drying a mixture of both dispersions. However, the maleimide hydrolysis that took place at basic pH prevented the use of this strategy. The only way to introduce maleimide groups in the furan capped dispersions was after water removal, which limits the application. In the second strategy (one pot), a Diels-Alder adduct was introduced in the polyurethane chain. Using this strategy, stable waterborne polyurethane dispersions were successfully synthesized.Both strategies allowed the obtaining of films that according to FTIR, DSC and NMR experiments showed cyclic temperature responsive behaviour, as at high and low temperature the Diels-Alder adduct was opened and regenerated respectively. As a consequence of this reaction, the temperature increase provoked chain scission reducing both the polymer molecular weight and the viscosity.Using the one pot strategy, a Diels-Alder adduct containing polyurethane film was obtained for the first time from waterborne systems. This can be of great interest in order to obtain functional self-healing coatings with reduced volatile organic compounds (VOC).

Investigation of non-adhesive behaviour of waterborne polyurethane dispersions

The current work probe the thermo-mechanical defects responsible for the non-adhesive behaviour of waterborne polyurethane dispersions (PUDs). A sequence of composition of PUDs has been developed by using blended macrodiols of hydroxyl terminated polybutadiene (HTPB) and polypropylene glycol (PPG). The urethane linkages have been developed by the use of 1,6 hexane diisocyanate (HDI). The polymer contents synthesized by prepolymer method have been dispersed in deionized water to develop ecofriendly dispersions. The dispersions were subjected to probe tack analysis to determine the extent of adhesiveness. The adhesive properties evaluated from probe tack curve show tack adhesion energy from 10.5 to 42. 5 J-m-2. The DMA analysis revealed high storage modulus up to 1.42 MPa for PUD films. The adhesive properties evaluated by the consideration, of the ratio of loss tangent, to the storage modulus (tanδ / E′) for comparison resulted in the values from 0.15 -0.71 MPa-1. The Tg ranges from 65 °C to 57 °C. The composition of blended macrodiols of high molecular weight HTPB results in tack less rigid films of PUDs.

Studies on Influence of the Size of Waterborne Polyurethane Nanoparticles on Coating Performance

Abstract Waterborne polyurethanes are extensively utilized as in coatings and adhesive applications because of their outstanding performance as solventless system. To achieve such a product with almost no or minimum volatile organic compounds, water is the best choice to utilize as a solvent medium in coating formulations to eliminate organic solvents from the final products. During the synthesis of the waterborne polyurethanes, the particle size of final dispersion products depends on many factors like NCO:OH content, the concentration of acid, synthesis conditions, chain extension process etc. In this research work using the prepolymer mixing process and changing NCO:OH content, flame retardant waterborne polyurethane dispersions (FWBPUD) were prepared from phosphorous containing polyester polyol and isophorone diisocyanate (IPDI). These prepolymers were neutralized by triethylamine followed by the addition of predefined quantity of water. Diethylenetriamine was used as a chain extender. These FWBPUs were further coated on various substrates. Characterization was done using Fourier transform infrared and Nuclear magnetic resonance spectroscopy. The average particle size of the dispersions was characterized by Microtrac-analyser. An influence of the size of waterborne polyurethane nanoparticles on the coating performance was described by scratch resistance, pencil hardness, adhesion (cross-hatch), flexibility 1/4“ mandrel test, chemical resistance and solvent resistance test. Due to the presence of phosphorous moiety, these FWBPUs also show flame retardancy which was investigated by limiting oxygen index (LOI) and UL-94 test methods. The FWBPU dispersions were stable for 8 months.

Enzymatic recycling of thermoplastic polyurethanes: Synergistic effect of an esterase and an amidase and recovery of building blocks

Biological recycling of polyurethanes (PU) is a huge challenge to take up in order to reduce a large part of the environmental pollution from these materials. However, enzymatic depolymerization of PU still needs to be improved to propose valuable and green solutions. The present study aims to identify efficient PU degrading enzymes among a collection of 50 hydrolases. Screenings based on model molecules were performed leading to the selection of an efficient amidase (E4143) able to hydrolyze the urethane bond of a low molar mass molecule and an esterase (E3576) able to hydrolyze a waterborne polyester polyurethane dispersion. Degradation activities of the amidase, the esterase and a mix of these enzymes were then evaluated on four thermoplastic polyurethanes (TPU) specifically designed for this assay. The highest degradation was obtained on a polycaprolactone polyol-based polyurethane with weight loss of 33% after 51 days measured for the esterase. Deep cracks on the polymer surface observed by scanning electron microscopy and the presence of oligomers on the remaining TPU detected by size exclusion chromatography evidenced the polymer degradation. Mixing both enzymes led to an increased amount of urethane bonds hydrolysis of the polymer. 6-hydroxycaproic acid and 4,4′-methylene dianiline were recovered after depolymerization as hydrolysis products. Such building blocks could get a second life with the synthesis of new macromolecular architectures.

Synthesis and properties of castor oil-based waterborne polyurethane/sodium alginate composites with tunable properties

In this paper, bio-based waterborne polyurethane dispersions were successfully prepared from castor oil using 2, 2-dimethylolbutanoic acid as the chain extender. Then, a series of bio-based composite dispersions and films were prepared by blending different amounts of sodium alginate aqueous solution with these bio-based polyurethane dispersions. The chemical structures, thermo-mechanical properties, thermal stability, and mechanical properties of the resulting composite films were characterized and discussed. The results show that the tensile strength and storage moduli of the composite films increase while the elongation at break of the composite films decrease with increasing the sodium alginate content. In addition, the contact angle and thermal stability of the composite films also increase with increasing sodium alginate content. These improvements are related to the increase of the crosslink density and the formation of interpenetrating networks with introduction of sodium alginate macromolecule.

Influence of polyurethane dispersion as surface treatment on mechanical, thermal and dynamic mechanical properties of laminated woven carbon-fiber-reinforced polyamide 6 composites

Carbon fiber (CF) plain-woven fabric-reinforced polyamide 6 (PA6) (CF/PA6) laminates were fabricated by the hot-compression technique. The carbon plain woven was treated with polyurethane dispersion (PUD) to improve the compatibility and adhesion with PA6, and the effects of PUD treatment on the mechanical, thermal and dynamic mechanical properties of the composites were investigated. The results of flexural tests and low-cycle flexural fatigue tests demonstrate that compared with a composite without PUD treatment, treated CF/PA6 laminates (the pick-up ratio of PUD is 0.53%) not only exhibit a 28.6% enhancement in flexural strength but also acquire a 5.4% improvement in residual flexural strength retention after fatigue tests. The additional oxygen-containing groups (e.g. CO) that are associated with PUD treatment are the contributing factors that strengthen the interfacial interactions between the CF and PA6 matrix, as supported by Fourier transform infrared spectroscopy results. Morphological analyses of the fracture surfaces using optical microscopy and scanning electron microscopy reveal an improvement in interfacial adhesion between the CF and PA6 matrix in the presence of PUD treatment. Differential scanning calorimetry results reveal that PUD treatment leads to a decline in the percentage of crystallinity (Xc). The storage modulus and glass transition temperature (Tg) of this composite with PUD treatment show an impressive improvement compared with the virgin composite whereas the damping coefficient (tan δ) decreases according to dynamic mechanical analysis results. Moreover, this composite also demonstrates improved thermal stability in comparison with untreated CF/PA6 laminates.

Effects of different segments in polyurethane on the performance of sand stabilization

ABSTRACTSynthetic polymers have recently drawn increasing attention to chemical sand stabilization (CSS). The relationship between the molecular structure and the fixing effect, however, is rarely reported aside from the performance. In this article, different segments of waterborne polyurethane dispersions (PUDs) are discussed with respect to their influence on stabilizing sand. We prepared five PUDs by controlling parameters including the diisocyanate‐to‐polyol ratio (R) and the molecular weight and characterized them with Fourier transform infrared spectroscopy and laser particle analysis. The unconfined compressive strength (UCS), a key criterion in CSS, was used to evaluate the performance of the PUDs. We found that a biggerRgave the polyurethane (PU) film a higher strength than the smallerRbut did not do the same to the sand mold. This indicated that homogeneity was a primary property of the sand mold. Taking the details of the crushed sand molds and the PU films into account, we concluded that the soft segments played a major role in the homogeneity. Force analysis showed that four modes of breaking occurred at the interface of the sand and cured PU. We concluded that whereas the hard segments in PU determined the ceiling of the UCS, the soft segments determined the floor by benefiting adsorption. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 47267.

The influence of the NCO/OH ratio and the 1,6-hexanediol/dimethylol propionic acid molar ratio on the properties of waterborne polyurethane dispersions based on 1,5-pentamethylene diisocyanate

1,5-Pentamethylene diisocyanate, a novel aliphatic diisocyanate formed from bio-based 1,5-pentamethylenediamine, has been used as a hard segmented material to synthesize polyurethane. In this study, several waterborne polyurethane (WPU) dispersions have been successfully prepared by a prepolymer process from 1,5- pentamethylene diisocyanate poly(polyether) with different NCO/OH ratios and 1,6-hexanediol (HDO)/dimethylol propionic acid (DMPA) molar ratios. The Fourier transform infrared (FTIR) spectra, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, and a mechanical tensile test were used to investigate the structures, thermal stability, phase separation, crystallinity, mechanical properties, and adhesive performance of the WPU dispersions. The FTIR results indicate that the degree of hydrogen bonding and the numbers of urea groups increase as the NCO/OH ratio and HDO/DMPA molar ratio increase. Furthermore, the phase separation increases and the thermal stability decreases as the NCO/OH ratio increases or the HDO/DMPA molar ratio decreases. Finally, WPU3.0-2.4 (NCO/OH = 3, HDO/DMPA = 2.4) exhibits a maximum tensile strength and shear strength, pointing to its possible use as an adhesive. These results could provide a very valuable reference for industrial applications of WPU.

Properties of Waterborne Polyurethane Conductive Coating with Low MWCNTs Content by Electrostatic Spraying.

Because flammable organic solvents are emitted during the construction process, oil-based conductive coatings generally result in potential safety problems. A high content of conductive mediums can also weaken the adhesive and protective abilities of existing conductive coatings. Therefore, an anticorrosive and conductive coating was prepared on Q235 steel substrate by spraying the multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) dispersion with a low MWCNT content in this work. The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating was investigated. It was concluded that a spatial network structure of MWCNTs-WPU was formed to make the coating structure more compact. The electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating first increased and then decreased as the MWCNT content increased. When the MWCNT content was only 0.2 wt % (which was far lower than that of the existing conductive coatings at 1 wt %), the coating began to conduct electricity; its resistivity was 12,675.0 Ω·m. The best combination property was the 0.3 wt % MWCNTs/WPU conductive coating. Its adhesive strength was 19.99% higher than that of pure WPU coating. Its corrosion rate was about one order of magnitude lower than that of pure WPU coating after being immersed in 3.5 wt % NaCl solution for 17 days.

Effect of interfacial coating and testing conditions on the flexural performance of carbon woven fibre-reinforced polyamide laminates

ABSTRACTThis study addresses the effects of testing temperature and speed on carbon woven fibre-reinforced polyamide 6 composites (CF/PA6) with or without polyurethane dispersion (PUD) surface treatment. Dynamic mechanical analysis (DMA) was employed to check visco-elastic properties of CF/PA6 laminates. CF/PA6 laminates with and without surface treatment are tested and evaluated by three-point bending tests. Five testing temperatures (30°C, 60°C, 90°C, 120°C, 150°C) and three testing speeds (0.1, 1, 10 mm min−1) were chosen to investigate the time-temperature behaviour of CF/PA6 laminates. Results showed that PUD surface-treated CF/PA6 laminates exhibited better performance on mechanical properties but lower viscosity at various testing conditions owing to enhanced interfacial bonding capability.

Dispersion Characteristics and Curing Behaviour of Waterborne UV Crosslinkable Polyurethanes Based on Renewable Dimer Fatty Acid Polyesters

In the last few years there has been a great deal of interest in modifying the methodologies for obtaining polyurethanes using more sustainable strategies. Following this tendency, in the present work, waterborne UV-curable polyurethanes were synthesized using commercially available dimer fatty acid based polyols obtained from renewable resources (Priplast from Croda). The polyols, characterized by proton nuclear magnetic resonance (1H NMR), differential scanning calorimetry (DSC) and size exclusion chromatography (GPC–SEC), were semicrystalline and presented very broad melting related with their complex molecular weight distribution. Different polyurethane dispersions were obtained by changing the percentage of the hard segment. Comparing with waterborne polyurethane dispersions obtained from non-renewable resources, the dispersions showed higher particle size even using similar or higher amounts of internal emulsifier. The curing behaviour was characterized by photo-differential scanning calorimetry (Photo-DSC) and the results showed that the conversion and polymerization rate decreased with the hard segment content and temperature. The obtained products displayed good thermal characteristics with phase-separated structures.

Performance Behavior of Chitosan Based Water Dispersible Polyurethanes: Physicochemical Properties

The research work was carried out to synthesize a series of novel chitosan based water dispersible polyurethanes (CS-WDPUs). The three step synthesis involves the formation of end capped PU-prepolymer was formed through the reaction between polyethylene glycol (PEG) (Mn=600 g/mole, dimethylolpropionic acid (DMPA) and isophorone diisocyanate (IPDI) followed by the preparation of neutralized NCO terminated PU-prepolymer, which lead to the chain extension by using the chitosan. The dispersion of the obtained product was carried out by adding proper proportion of water. The synthesized CS-WDPUs were applied onto the different qualities of plain weave poly-cotton printed and dyed textile swatches by employing pad-dry-cure procedures. The textile assets of the treated and untreated textile swatches were assessed, as color fastness, pilling resistance, tear and tensile strength. The results showed that the chitosan incorporation into PU backbone has significant effect on the assets of treated textiles. These synthesized CS-WDPUs are eco-friendly bio-based finishes with potential applications for polyester/cotton textiles.