Urethane Oligomers Research Articles

The effect of oligomers and monomers on the properties of UV-curable adhesive for cold embossing of foil

This paper studies the influence of an oligomer–monomer compound on the functional properties of UV-curable adhesive for cold foil on flexographic equipment. It is shown that difunctional aliphatic urethane acrylate and oligomer classified as an ordinary amine-modified polyester acrylate are best suited for cold embossing as the basis of a UV-curable adhesive composition.

Single‐phase product obtained via crude glycerine depolymerisation of polyurethane elastomer: structure characterisation and rheological behaviour

AbstractPolyurethane recycling is a topic of growing interest due to the increasing amount of polyurethane waste. The main purpose of polyurethane feedstock recycling is to recover the starting polyol, a valuable material. In this work, a method of polyurethane thermo‐chemical recycling, glycerolysis by means of crude glycerine, is proposed. The main effort is focused on the employment of crude glycerine without purification from biodiesel production as a decomposing agent for polyurethane recycling. The influence of polyurethane‐to‐glycerine mass ratio (PU/GL) on chemical structure was examined using Fourier Transform Infrared (FTIR) and Proton Nuclear Magnetic Resonance (1H NMR) spectroscopy and Gel Permeation Chromatography (GPC). Glass transition temperature (Tg) and thermal properties using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and also rheology were analysed. FTIR and 1H NMR analyses of the glycerolysates showed peaks similar to those of virgin polyol. From GPC chromatograms it was concluded that glycerolysates are a mixture of compounds with different molecular weights, such as recovered polyol, urethane oligomers or carbamates. Glycerolysates indicated Tg in the range from −65 to −60 °C and, for high PU/GL ratio, a second Tg appeared. Thermal stability of glycerolysates increased with increasing PU/GL ratio. The molecular weight of glycerolysates ranged from 700 to 1020 g mol−1 depending on PU/GL mass ratio. The semi‐products were defined as non‐Newtonian fluids, where viscosity depended on the shear rate. Crude glycerine, derived from biodiesel production, was successfully used in polyurethane decomposition, resulting in valuable semi‐products. © 2016 Society of Chemical Industry

The Effect of Reactives Diluents to the Physical Properties of Acrylated Palm Oil Based Polyurethane Coatings

The development of polyurethane with hydroxyl access in a molecule leads to a new alternative of low toxicity green product. Palm oil is one of the major commodities in Malaysia. The potential of palm oil to be used as coatings raw material such as alkyd is limited due to low unsaturated side on fatty acid chains. To overcome this limitation, palm oil was modified through transesterification process to produce polyol. Acrylated isocyanate (urethane oligomer) was then grafted onto polyol to produce polyurethane with vinylic ends. The polyurethane was formulated with different cross-linkers (reactive diluents) and cured under UV radiation. The effect of three different diluents; monoacrylate, diacrylate and triacrylate on the properties of cured polymer were studied in this research. Fourier Transform Infrared (FTIR), Hydroxyl Value Titration, Gel Content, and Volatile Organic Compound (VOC) were used for characterization. Physical testing performed were Pencil Hardness and Pull-Off Adhesion test. Novel palm oil-based polyurethane coatings have been found to have good properties with mono acrylate functionality.

A new oligourethane-crosslinked biologic mesh for abdominal wall tissue reconstruction

Event Abstract Back to Event A new oligourethane-crosslinked biologic mesh for abdominal wall tissue reconstruction Aarón J. Palacios-Rodríguez1, José L. Mata-Mata2, Laura E. Castellano1, Iraís A. Quintero-Ortega1, Jorge Delgado1, Juan Vargas-Mancilla3, Arturo Vega-González1 and Birzabith Mendoza-Novelo1 1 Universidad de Guanajuato, Chemical, Electronics and Biomedical Engineering, Mexico 2 Universidad de Guanajuato, Chemistry, Mexico 3 Centro Médico Nacional del Bajío, IMSS, Hospital Gineco-Pediatra No 48, Mexico Introduction: The extension of the crosslinking degree in collagen matrices has been established as an influencing factor on the mechanical properties, surface properties, biodegradation, and cell behavior [1],[2]. The crosslinking of acellular pericardial meshes with water-soluble urethane oligomers is easily adjusted by process parameters such as pH, volume and molecular weight [3]. Subsequently, the susceptibility to the in vitro degradation and the cytotoxic potential of the soluble products appear to be dependent on the crosslinking [4]. In this work, we explore the relationship between the crosslinking extension and the performance of a biologic mesh in the reconstruction of the rodent abdominal wall tissue. Materials and Methods: The acellular pericardial matrix [5] was crosslinked with oligourethanes synthesized from hexamethylene diisocyanate and poly(ethylene glycol) 1000 Da [4]. The ratio of oligourethane-to-matrix-to-buffered saline solution was adjusted to obtain two different extensions of crosslinking [3]. The crosslinking extension was confirmed by the ninhydrin assay. Wistar rats (male) were subjected to the surgical procedure to implant lyophilized meshes in an abdominal wall defect. The animals were euthanized at 30 days post-implantation and the implant were retrieved and rinsed with saline solution. The explanted grafts were examined for muscle integration, intraperitoneal adhesion, infection and vascularization. Results: The crosslinking process of acellular pericardial matrix with oligourethane produces extensions of 30 and 50 % according to blocking of tissue-amines. The lyophilized meshes are easily implanted in the rodent abdominal wall. The gained weight of the male rats, 15 and 30 days post-implantation, is similar for non-crosslinked and crosslinked meshes. The new vasculature are observed on all three grafts. According to the initial size, all three grafts show stretchability after 30 days implantation. In addition, the intestinal adhesions are not observed for the hybrid graft manufactured with a crosslinking extension of 50%. Discussion: The abdominal wall reconstruction with biologic grafts is an alternative to address the limitations of polypropylene meshes in many clinical conditions. The use of a biologic mesh crosslinked with water-soluble oligourethanes in the reconstruction, in a rodent model, of abdominal wall tissue appears to be promising in situations requiring the retarded biodegradation. This study indicated a processing-structure-property relationship in these hybrid templates that will contribute to engineer the host-graft integration. Conclusion: Biologic meshes are crosslinked with oligourethanes to produce gradients in the crosslinking extensions. The abdominal wall defects in a rodent model are easily repaired with the hybrid meshes. SEP-CONACYT (Grant CB2011/164440, Mexico) and Fund CIO-UG (Grant 2014 & 2015, León, Mexico).

Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane

In this work, a series of high-solids crosslinked hybrid networks based on the epoxy-terminated urethane oligomer and the comb-like structure epoxy-functional siloxane cured with diethylenetriamine, were obtained. The structure of the obtained poly(urethane–siloxane) thermosets was confirmed by FTIR spectroscopy. The samples were submitted to detailed thermal degradation investigations at non-isothermal conditions in nitrogen and air. The contact angles of the coatings and free surface energy calculated by Owens–Wend as well as van Oss–Good method, were studied. Some coating properties of the obtained hybrid materials were also investigated. The synthesized poly(urethane–siloxane) networks are hydrophobic materials, with free surface energy of 26–29 mJ/m2. The thermal stability and hardness of these increases with increasing siloxane content.

Preparation of Fully Bio-Based UV-Cured Non-Isocyanate Polyurethanes From Ricinoleic Acid

Fully bio-based non-isocyanate polyurethane (NIPU) was facilely prepared by self-condensation of primary amide of ricinoleic acid under oxidation conditions. The resulting linear urethane oligomer (Mn = 1300 Da) as a viscous liquid was further cured under UV light irradiation to afford a polymer film with hardness of lower than 2B. Infrared spectra as well as changes of polymer appearance proved crosslinking of the linear NIPU. Hardness of UV-cured film was promoted to 4H when a certain amount of cardanol was added to the linear urethane oligomer, accompanied by manifest improvement of resistance to chemical media such as aqueous HCl, EtOH, toluene and THF.

Synthesis and properties of UV-curable polyurethane acrylates containing fluorinated acrylic monomer/vinyltrimethoxysilane

A series of UV-curable polyurethane acrylates containing fluorinated acrylic monomer (heptadecafluorodecyl methacrylate, PFA, 6 wt%)/vinyltrimethoxysilane (VTMS, 0–9 wt%) [FPUA6/0, FPUA6/3, FPUA6/6 and FPUA6/9, where the numbers indicate the wt% of PFA/VTMS] were synthesized from a reactive urethane oligomer (40 wt%) and diluents (60 wt%). This study examined the effect of bulky VTMS (0–9 wt%)/bulky IBOA (34–25 wt%) weight ratio on the properties of the UV-curable polyurethane acrylates for transparent anti-fouling coating materials. In the wavelength range of 400–800 nm, the transmittance % of the FPUA film samples increased markedly up to nearly 100 % with increase in the VTMS content up to 9 wt%. As the VTMS content increased, the storage modulus/tensile modulus/hardness of the UV-cured film samples increased significantly and the tensile strength/glass transition temperature increased a little; however, the elongation at break decreased significantly. XPS showed that the film–air surface of the UV-cured polyurethane acrylate film had a higher fluorine content than the film–dish interface indicating the gradient concentration of fluorine in the structure of the film from the film–air surface to the film–glass interface. As the VTMS content increased from 0 to 9 wt%, the surface tension of the UV-cured urethane acrylate films decreased from 17.2 to 15.9 mN/m, whereas the water/methylene iodide contact angles of the film–air surface increased significantly from 107.9/80.9° to 114.2.9/84.2°. These results suggest that the UV-curable polyurethane acrylate containing 9 wt% of VTMS has strong potential as a coating material for transparent antifouling applications.

Thermal degradation studies of poly(urethane–siloxane) thermosets based on co-poly(dimethyl)(methyl, 3-glycidoxypropyl)siloxane and epoxy-terminated urethane oligomer

Abstract A series of crosslinked hybrid poly(urethane–siloxane) networks based on comb-like structure co-poly(dimethyl)(methyl, 3-glycidoxypropyl) siloxane, epoxy-terminated urethane oligomer cured with diethylenetriamine, were obtained. The samples were submitted to thermal stability investigations at non-isothermal conditions in nitrogen and air. The thermal degradation behavior was investigated by evolved gas analysis, using coupled TG-FTIR technique. The kinetic parameters of the degradation process were determined both by isoconversional methods of Friedman and Kissinger–Akahira–Sunose as well as by model fitting multivariate non-linear regression method. It was observed that the thermal stability of the poly(urethane–siloxane) thermosets depends on the siloxane content. The first stage of degradation is associated with urethane degradation and the second with decomposition of polyoxytetramethylene and siloxane moieties. The best fit of the f ( α ) function with the experimental data was found for two-step degradation mechanism.

A New Way to Synthesize Poly(Urethane-Imide)s Based on Nitroethyl Carbamate Intermediary

Poly(urethane-imide)s were prepared using a new method based on Michael addition and elimination reactions of bis(nitroethyl)urethane oligomers (PUNO2) with bismaleimides. The bis(nitroethyl)urethane oligomers were synthesized from poly(tetramethylene oxide) glycol of molecular weight 650, 1000, 1500 and 2000 (Terathane 650, 1000, 1500 and 2000), 1,6-hexamethylene diisocyanate (HMDI) or dibenzyl diisocyanate (DBDI), and 2-nitroethanol, in the molar ratio of 1:2:2, in solution. The poly(urethane-imide)s were characterized using Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR) spectroscopies, thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), contact angle measurements, and mechanical analysis. The dynamic contact angles of the cast films of these polymers were influenced by the molecular weight of the poly(tetramethylene oxide) glycol and the hard segment of the polyurethanes. Static mechanical measurements showed greater strength at break and modulus for the obtained poly(urethane-imide)s (PUI), the modulus being even ten times higher than that of PUNO2 when using aryl diisocyanate.

UV curable urethane acrylate coatings formulation: experimental design approach

Purpose – The purpose of this work was to perform a systematic study on the effect of formulation on the physical and mechanical properties of ultaviolet (UV) curable urethane acrylate resins. In addition, the authors wanted to derive mathematical formula for the prediction of physical and mechanical properties for the aforementioned system. Design/methodology/approach – The experiments were carried out based on mixture experimental design to determine the effect of different multifunctional acrylates (i.e. 1,6-hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), trimethyolpropane triactylate (TMPTA)) concentration on the physical and mechanical properties of a UV curable polyurethane acrylate system. The urethane oligomer was synthesized and characterized by the research team. Microhardness, adhesion strength and scratch resistance of the cured films were evaluated as the physical and mechanical properties. Findings – The results revealed that the resin and TMPTA concentrations had the most significant effects on the microhardness property. Adhesion strength of the films showed a linear trend with respect to all variables. Moreover, all components also had a significant and complex influence on the scratch resistance of the cured systems. In addition, mathematical equations proposed by mixture experimental design were derived for all the mentioned properties. Research limitations/implications – Other multifunctional acrylate monomers (i.e. more than three functional) can be used in the formulations. The kinetics of the curing can affect on the network formation and consequently on the properties of the cured films. Practical implications – The obtained results can be used by the researchers who are active in the field of structure-property relationship of polymers and surface coatings. The reported data and the mathematical equations can also be used for the formulating of an appropriate formulation based on a specific application. Originality/value – A systematic and statistical-based approach, i.e. mixture experimental design, was used to evaluate the effect of formulation on some of the properties of a UV curable polyurethane acrylate system. A urethane oligomer and three different multifunctional acrylate monomers as reactive diluents were used in the formulations. Noteworthy to mention that several mathematical models were derived by using analysis of variance for the prediction of the properties studied in this system.

Transparency Enhancement for Photoinitiated Polymerization (UV Curing) through Magnetic Field Alignment in a Piezoresistive Metal/Polymer Composite

We use a magnetic field to align nickel particles into stringlike assemblies in urethane oligomer mixtures and create a semitransparent UV-curable nickel particle/polymer composite with anisotropic electrical conductivity and piezoresistive properties. When the particles are uniformly distributed in the oligourethane matrix, the mixture is moderately conductive at higher particle fractions but becomes insulating once the fraction is below about 5 vol %. With the particle fraction below this threshold and using an external magnetic field, the particles are aligned into continuous pathways through the oligomer mixtures following the magnetic flux lines. The matrix is subsequently cured by UV light. This results in conductivity and piezoresistivity along the alignment direction, while the material is not conducting perpendicular to the alignment direction. The lower particle fraction results in a lower number of absorbers for UV light: the decrease from 5 to 1 vol % increases optical transmission from 10% to 50% in the UV/vis region. This leads to a shorter photocuring time, typically from tens of seconds to seconds for 300-μm-thick films at a wavelength of 365 nm. We propose that this concept could be applied in areas such as pressure sensors.

Synthesis and ultraviolet‐curing behaviors of vinyl ether functionalized polyurethane oligomers

ABSTRACTThe vinyl ether functionalized oligomer is one of the most basic components of vinyl ether functionalized materials for cationic UV‐curable coatings. In this study, three types of vinyl ether functionalized polyurethane oligomers (i.e., polyether, polyester, and polydimethylsiloxane) were synthesized with diisocyanate, diol, and hydroxyethyl vinyl ether. These oligomers were characterized by IR, 1H‐NMR, and 13C‐NMR spectroscopy. The effect of the raw material ratio on the oligomer, UV‐curing behaviors, and thermal properties of these oligomers were investigated. The UV‐curing behavior was analyzed by real‐time Fourier transform infrared spectroscopy. The vinyl ether terminated polyester urethane oligomer exhibited better UV curing, with a higher final conversion and maximum UV‐curing rates. In addition, the light intensity was enhanced for oligomers with better UV‐curing properties. Research on these vinyl ether functionalized oligomers is essential to the development and applications of cationic vinyl ethers systems. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40501.

Synthesis and characterization of protected oligourethanes as crosslinkers of collagen-based scaffolds.

This paper describes the preparation and characterization of water-soluble urethane oligomers bearing protected isocyanate groups. It also points out its ability to crosslink decellularized pericardium, as a model collagen scaffold, and to adjust their structural characteristics. A library of oligourethanes was synthesized by varying the molecular weight (Mw 400, 600, 1000 or 2000 g mol-1) of the poly(ethylene glycol) and the type of aliphatic diisocyanate (isophorone diisocyanate/IPDI or hexamethylene diisocyanate/HDI). 1H and 13C NMR, FTIR and mass spectrometry demonstrated that the crosslinkers are composed of chains with carbamoylsulfonate end groups that have trimeric and pentameric oligourethanes, and monomeric diisocyanate. The degree of crosslinking and hence the in vitro degradation susceptibility of the decellularized pericardium were inversely related to the Mw of the oligourethanes. The toxicity of the extractable products from oligourethane-collagen materials toward fibroblasts and macrophages was found to be lower for the crosslinker derived from IPDI than for those derived from HDI. On the other hand, the resistance to collagenase or oxidative degradation of the bovine pericardium crosslinked with HDI/oligourethane was higher than the one prepared with IPDI/oligourethane. As the Mw of the oligomers regulates the degree of crosslinking while the chemical composition influences the cytocompatibility and biodegradation of decellularized pericardium, these urethane oligomers can be used as safer crosslinkers for other protein-based biomaterials.

Development and evaluation of self-polishing urethane coatings with tethered quaternary ammonium biocides

The synthesis and characterization of hydrolysable, antimicrobial cross-linked polyurethanes are described. Cross-linking of isocyanate-terminated urethane oligomers with glycol-modified silanes was used as a novel method for imparting enhanced mechanical integrity and hydrolytic potential to polyurethane coating systems. By combining these cross-linkers with a variety of biocidal quaternary ammonium salts and polyisocyanates, a library of hydrolysable polyurethanes were developed with controllable mechanical, thermal, hydrolytic, and antimicrobial properties. Up to a 3-log reduction of viable microbes was observed and correlated with the surface content of side chain quaternary ammonium salt moieties. Diminished antibacterial characteristics of completely amorphous systems are attributed to the segregation of low surface energy constituents at the material:air interface and relegation of biocidal species to within the bulk material.

Synthesis and Characterization of Aliphatic Tri-functional Oligomeric Urethane Methacrylate used for UV-Curable Aluminum Pigmented Coatings

A new UV-curable coating with aluminum pigments was developed as part of an effort to replace chromium coatings, which raise health and environmental concerns. For achieving this, aliphatic tri-functional oligomeric urethane methacrylate (ATOUA) was synthesized using trimethylol propane (TMP), isophorone diisocyanate (IPDI), hydroxyethyl methacrylate (HEMA) and dibutyltin dilaurate (DBTDL) as a catalyst. In order to obtain a metallic shine effect, leafing and non-leafing aluminum pigments were formulated with ATOUA to obtain a series of coatings. The UV-curable aluminum pigmented coatings were prepared by blending ATOUA, 1,6-hexanediol diacrylate (HDDA) and trimethylol propane triacrylate (TMPTA) as reactive diluents, benzophenone as photoinitiator, N-methyl diethanolamine as co-initiator, aluminum pigments, and wetting and dispersing agent (OA 10EO). Surface morphology of the coatings was investigated through SEM. FTIR; 1H-NMR and 13C-NMR spectroscopes were used to characterize composition of the synthesized oligomer. Physical, chemical and mechanical properties of surface coatings have been determined using König hardness, cross cut, impact, gloss, mandrel, cupping and salt spray test. Thermal properties of the cured coating were also investigated by means of DSC and TGA.

Study of Thermal Properties on UV-Curable Coatings Derived from Oleochemical Polyols

Over the last few years, UV radiation curing has become a well established coating technology used for several different applications. Polymeric component based on renewable resource is another area for getting low VOC coatings. In the present study cellulose and soya fatty acid were used to prepare oleochemical polyols which in turn reacted with diisocyanates to get PU which is further reacted with hydroxyl terminated acrylates to get oligomeric urethane acrylates. These polymeric compounds are used without any organic solvent for UV-coating formulation and cured by UV light on the metal surfaces. Thus effect of different types of polyols were used to prepared UV coatings studied on thermal properties like dynamic mechanical properties (DMA) and thermogravimetric analysis (TGA)

Polyurethane–epoxy based azopolymers: Influence of chemical structure over photoinduced birefringence

Abstract A comparative study of the influence of the competitive reactions that can take place in epoxy–isocyanate based azo systems over optical behavior was developed. Diverse disperse red 19 (DR 19) azo urethane oligomers (PUs) were synthesized and characterized using size exclusion chromatography (SEC), Fourier transform infrared (FTIR), and UV–visible spectroscopy. Based on these urethane oligomers, epoxy-PU networks having isocyanurate and oxazolidone rings in their structures were prepared in different isocyanate/epoxy stoichiometric ratios, r = eq. NCO/eq. epoxy (0.5, 1, and 2). Photoinduced anisotropy (Δ n ), remnant birefringence (RB) and dichroism were measured for the resulting polymers and evaluated as function of their T g s and chemical structures. Final materials exhibited very high values of Δ n and RB being promised materials for using in optical storage information devices.

Photopolymerization experiments and properties of some urethane/urea methacrylates tested in dental composites

Hydrophobic silyl-urea/urethane methacrylates (UHM-1, UHM-2) and a modified BisGMA derivative (BisGMA-UMA) were synthesized and used as photopolymerizable co-monomers in the preparation of dental composites, besides other urethane dimethacrylates containing oligoethylene oxide segments and carboxylic groups. The homo- and copolymerization behaviour of the synthesized monomers were investigated by FTIR spectroscopy using camphorquinone (CQ) and 4-(dimethylamino)-phenylacetic acid (DMPheAA) as a photoinitiating system, as well as by photo-DSC. The first hybrid monomethacrylate, N-(methacryloyloxyethyl-N’-diethoxymethylsilylpropyl)-urea showed the highest value for the maximum polymerization rate (0.117 s−1) followed by BisGMA analogue (0.085 s−1) and N-methacryloyloxyethyl-N’-bis(triethoxysilylpropylcarbamoyloxyethyl)-urea (0.069 s−1), whereas the degree of conversion decreased from 75.1% (UHM-2) to 41.6% (BisGMA-UMA). Polymerization shrinkage (PS) measured by picnometry for the mixture BisGMA-UMA/TEGDMA (4.78 vol.%) was lower than that exhibited of the control organic matrix BisGMA/TEGDMA (6.85 vol.%) at the same dilution. The addition of one of the obtained monomers into a mixture based on urethane oligomers led to a polymerization shrinkage varying between 8.33 and 6.97 vol.%. A number of properties of the composites formulated with our urethane methacrylates, a urethane dimethacrylate, BisGMA, and glass filler (Zr/Sr glass, quartz, and diatomite) were also determined including the surface damage caused by the Vickers indentation to establish their utility in dentistry.

Dual-curing behavior and scratch characteristics of hydroxyl functionalized urethane methacrylate oligomer for automotive clearcoats

UV–thermal dual-curable, hydroxyl- and methacrylate-functionalized urethane oligomers with different contents of unsaturated double bonds and hydroxyl groups have been synthesized and incorporated into automotive clearcoats to investigate their curing and scratch behaviors. Dynamic mechanical analyses (DMA) and FT-IR analyses were performed to observe the variation of the crosslinking networks that resulted from the chemical reactions by UV and thermal dual-curing operations with varying curing conditions, such as UV dose, thermal curing time, thermal curing temperature, and curing sequence. The scratch behaviors of dual-cured automotive clearcoats were analyzed via nano-scratch tests, accompanied with scratch images simultaneously visualized using scanning electron microscopy (SEM). The mechanical and chemical properties, such as impact resistance, pencil hardness, acid-etch resistance, and stone-chip resistance, of dual-curable clearcoats were also compared with those of UV mono-cure and 1K thermal-cure clearcoats. The results clearly showed that the dual-curing process induced a considerably higher degree of crosslinking for the cured clearcoats prepared from the dual-curable oligomers, melamine crosslinkers, and photoinitiators. Their mechanical properties including scratch resistance were also noticeably improved via the UV–thermal curing sequence, which led to an increased conversion rate of double bonds compared with clearcoats produced using the thermal–UV curing sequence. The best conditions for high crosslinking density as well as high hardness and modulus were 2400mJ/cm2 at 150°C for 10min in the UV–thermal curing process. This result was corroborated from the reaction kinetics and surface images of the scratched clearcoats captured by SEM.

Novel quinoline-based polyurethane elastomers. The effect of the hard segment structure in properties enhancement

Polyurethane elastomers incorporating a quinoline moiety along their polymeric backbones and aliphatic, aromatic or heterocyclic crosslinkers have been synthesized and characterized. For this, NCO-terminated urethane oligomers were prepared from poly(butylene adipate) diol and methylene diphenyl diisocyanate and were subsequently chain extended with 2,4-quinolinediol and different crosslinkers. This study reports the influence of the different crosslinker chemical structures and the hard segment molar ratio on the thermal and dynamic mechanical thermal properties, as well as on the mechanical properties of these elastomers. The fluorescence spectra of polyurethane elastomers were determined at an excitation wavelength of 290 nm. The different chemical structures of the crosslinkers determine the hard segment cohesion and reduce the mobility of the soft phase, having an important effect on thermal stability and on the mechanical properties of the polyurethane films. Thus the incorporation of aromatic crosslinkers results in polyurethanes with lower elongation and stress at break. The highest mechanical properties were obtained for polyurethanes crosslinked with aliphatic crosslinkers.