3-aminopropyl Trimethoxysilane Research Articles

Improved corrosion protective performance of hybrid silane coatings reinforced with nano ZnO on 316 L stainless steel

In this research, silane hybrid coatings based on γ-glycidoxypropyltrimethoxysilane/ methyltrimethoxysilane/ 3-aminopropyl trimethoxysilane (GPTMS/MTMS/ APS) were produce by sol-gel method. ZnO nanoparticles were embedded in the silane coating and this exclusive silane coating was employed to 316 L stainless steel (SS) substrates by the dip-coating method. The surface characteristics of the samples were examined by FTIR analysis, XRD, SEM-EDS, and contact angle measurements. Further, the corrosion protection behavior of the coatings was examined in 3.5 wt% aqueous NaCl solution using potentiodynamic polarization, EIS, and SECM analysis. AFM was applied to determine the surface morphologies of the samples after the polarization test. Our results exhibited that the coatings enhanced the anti-corrosion performance of SS substrates. It was also obtained that the combination of GPTMS/MTMS/APS provided better corrosion protection properties and acts as a strong physical barrier to the corrosive molecules. The presence of nano ZnO further improved the protective barrier of the coating.

Influence of the polarization enhanced by barium strontium titanate and their surface modified fillers in the organic-inorganic composites of polyurethane based polycarbonate diol

The concept of making composite has been conducted to improve the polarization of polyurethane (PU) based polycarbonate diol. Barium strontium titanate (BST), lead-free ceramic with high dielectric and piezoelectric coefficient, was synthesized. To improve the compatibility of BST in PU composites, hydrogen peroxide and 3-aminopropyl trimethoxysilane were used to modify the BST surface. The organic-inorganic composite was synthesized using a prepolymer method by varying types of filler. BST create the physical interaction with PU while modified BST create the chemical interaction with PU in composites. The highest dielectric constant was found in the organic-inorganic composite with surface modified BST.

Facile Preparation of PANI-Sr Composite Flexible Thin Film for Ammonia Sensing at Very Low Concentration

Conducting polymers, are still fascinating the industrial applications area since their discovery, particularly in the field of chemical sensors. For this purpose, flexible and highly sensitive based polyaniline-strontium (PANI-Sr) films were successfully prepared via a facile in-situ chemical polymerization process of aniline in presence of Sr (NO3)2 deposited on biaxially oriented polyethylene terephthalate (BOPET) flexible substrates with prior surface treatment using (3-aminopropyl) trimethoxysilane. Spectral, structural, morphological, and surface behavior characterizations were carried out using Fourier transform infrared spectroscopy (FTIR-ATR), X-ray fluorescence (XRF), raman spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and surface wettability. The electrical conductivity was measured by the usual four probes technique. Noticeably, the prepared films with Sr (NO3)2 ∼2 M have shown a highest conductivity of 0.3 S·cm−1 over the other samples. This conductivity feature has been exploited to test the sensitivity and the performances of the obtained films toward different type of gas. The PANI-Sr sensor demonstrates an outstanding selectivity and an excellent sensitivity towards the ammonia (498% response to 100 ppm) within a detection limit of 0.013 ppm, and a fast response/recovery time (1 s /42 s) toward 50 ppm at room temperature. The PANI-Sr sensor also showed a good reproducibility during five cycles. The interaction mechanism of PANI-Sr sensor film and the NH3 vapors was discussed basing on the impedance spectroscopy analysis results. The obtained results highlight the paramount role played by the strontium particle in enhancing the ammonia detection performances, when they are imbedded into PANI matrix through facile preparation process, and they emphasize their prominence over the similar study.

Modification of magnetic Fe3O4 nanoparticles for targeted delivery of payloads

The development of methods for targeted delivery of payload is a rapidly developing area of research.For this reason, iron oxide nanoparticles have potential to be used in delivery of substances by using external magnetic field. However it is necessary to develop methods of their modification, which will lead to the pos-sibility of immobilization of payloads with the required concentration for therapeutic use. In this article, supermagnetic iron oxide nanoparticles (Fe3O4) were modified with silanes such as (3-chloropropyl)-trimethoxysilane, (3-mercaptopropyl)trimethoxysilane, (3-aminopropyl)trimethoxysilane and (3-glycidyl-propyl)trimethoxysilane by reaction of polycondensation. Then carborane compound (payload) was success-fully attached on the modified nanoparticles via covalent bonding. Structure, size and element composition were studied by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDA). It was found that resulting nanoparticles contain 16.6% of bo-ron (according to EDA), and their average size is 32±9 nm (according to SEM). In vitro test using HeLa (cer-vical cancer cell) and PC-3 (prostate cancer cell) shows low cytotoxicity in concentration range of 1–200μg/ml.

Biohybrid oxidized alginate/myocardial extracellular matrix injectable hydrogels with improved electromechanical properties for cardiac tissue engineering

Injectable hydrogels which mimic the physicochemical and electromechanical properties of cardiac tissue is advantageous for cardiac tissue engineering. Here, a newly-developed in situ forming double-network hydrogel derived from biological macromolecules (oxidized alginate (OA) and myocardial extracellular matrix (ECM)) with improved mechanical properties and electrical conductivity was optimized. 3-(2-aminoethyl amino) propyltrimethoxysilane (APTMS)-functionalized reduced graphene oxide (Amine-rGO) was added to this system with varied concentrations to promote electromechanical properties of the hydrogel. Alginate was partially oxidized with an oxidation degree of 5% and the resulting OA was cross-linked via calcium ions which was reacted with amine groups of ECM and Amine-rGO through Schiff-base reaction. In situ forming hydrogels composed of 4% w/v OA and 0.8% w/v ECM showed appropriate gelation time and tensile Young's modulus. The electroactive hydrogels showed electrical conductivity in the range of semi-conductors and a suitable biodegradation profile for cardiac tissue engineering. Cytocompatibility analysis was performed by MTT assay against human umbilical vein endothelial cells (HUVECs), and the optimal hydrogel with 25 μg/ml concentration of Amine-rGO showed higher cell viability than that for other samples. The results of this study present the potential of OA/myocardial ECM-based hydrogel incorporated with Amine-rGO to provide a desirable platform for cardiac tissue engineering.

A General Approach for Monolayer Adsorption of High Weight Loadings of Uniform Nanocrystals on Oxide Supports.

Monodispersed metal and semiconductor nanocrystals have attracted great attention in fundamental and applied research due to their tunable size, morphology, and well-defined chemical composition. Utilizing these nanocrystals in a controllable way is highly desirable especially when using them as building blocks for the preparation of nanostructured materials. Their deposition onto oxide materials provide them with wide applicability in many areas, including catalysis. However, so far deposition methods are limited and do not provide control to achieve high particle loadings. This study demonstrates a general approach for the deposition of hydrophobic ligand-stabilized nanocrystals on hydrophilic oxide supports without ligand-exchange. Surface functionalization of the supports with primary amine groups either using an organosilane ((3-aminopropyl)trimethoxysilane) or bonding with aminoalcohols (3-amino-1,2-propanediol) were found to significantly improve the interaction between nanocrystals and supports achieving high loadings (>10 wt. %). The bonding method with aminoalcohols guarantees the opportunity to remove the binding molecules thus allowing clean metal/oxide materials to be obtained, which is of great importance in the preparation of supported nanocrystals for heterogeneous catalysis.

AMT/APS Multilayered Films as Adherence Promoters for Epoxy Coatings on Carbon Steel—Part I: Influence of Curing Conditions on Anticorrosive Properties of AMT/APS Films in Saline Medium

The first part of this work evaluates the influence of the cure conditions on the preparation of 3-aminopropyl trimethoxysilane (APS) and the corrosion inhibitor 5-amino-1,3,4-thiadiazole-2-thiol (AMT) multilayered films onto AISI 1020 carbon steel. The steel samples were pretreated in a 10−2 mol L−1 AMT solution for 3 h, immersed twice in a 5% v/v APS solution, and heat-treated at different temperatures and curing times. Regardless of the curing conditions used, electrochemical impedance spectroscopy (EIS) in 0.5 mol L−1 NaCl showed that the inhibitor pretreatment favored the formation of a more protective film when compared to the alkaline-treated steel, covered or not by AMT or APS thin films. The AMT/APS multilayered film cured at 100 °C and 80 min exhibited the best improvement in the anticorrosive properties among all of the films studied in this work, which was confirmed by potentiodynamic polarization (PP) experiments performed in the same electrolyte. XPS analysis of the selected AMT/APS film system revealed the formation of a Fe-O-S-R chemical bond, confirming the interaction of the AMT inhibitor with the NaOH-treated steel surface. The present findings indicate that the APS-AMT interaction may have occurred from the N-S bond, identified in the N 1s spectrum.

(3-Aminopropyl)trimethoxysilane Self-Assembled Monolayer as Barrier of Porous SiOCH for Electroless Cu Metallization: Optimizations of SiOCH Hydroxylation and Monolayer Functionalization

Self-assembled monolayers (SAMs) are potential diffusion barriers of nanoporous carbon-doped organosilica (p-SiOCH) for Cu metallization. A concern regarding silanization of the p-SiOCH using a wet chemical process is that its dielectric properties and bonding structures could be damaged by the chemical solution used, which is rarely addressed. In this study, the capacity of various (3-aminopropyl)trimethoxysilane self-assembled monolayers (APTMS-SAMs) as a barrier of p-SiOCH for electroless Cu metallization is evaluated. The processing of hydroxylation of the p-SiOCH (for silanization) and functionalization of APTMS-SAMs (for seeding of electroless metallization) was controlled through examining dielectric properties and bond structures of the hydroxylated p-SiOCH and functionalized APTMS-SAMs. Through tailoring the wet chemical treatments, the dielectric constant, insulating capacity, and bonding structure of post-treated p-SiOCH could be preserved at the pristine states, and the APTMS-SAM fabricated turns out to be a reliable barrier thermally stable up to 500 °C, 100 °C greater than that of the p-SiOCH without an SAM barrier. The integration of electroless Cu metallization reliably with p-SiOCH using a near-zero-thickness monolayer (free of a conventional metallic barrier) in an all-wet manner will be demonstrated. However, to make this approach working, both the hydroxylation of p-SiOCH and functionalization of APTMS-SAM have to be optimized.

Adsorption of pharmaceuticals pollutants, Ibuprofen, Acetaminophen, and Streptomycin from the aqueous phase using amine functionalized superparamagnetic silica nanocomposite

Pharmaceuticals are one of the emerging pollutants that pose a severe threat to the aquatic habitats, which in turn affects other species in the biosphere. The superparamagnetic based silica nanocomposites modified with aminosilane were characterized for their physicochemical properties and also the purity of the nanocomposite obtained was determined. The adsorptive properties of the nanocomposites were investigated for the removal of pharmaceutical pollutants such as Ibuprofen, Acetaminophen, and Streptomycin from aqueous solutions. The adsorption process of pharmaceuticals was found to reach equilibrium within the first 15 min reporting high removal efficiency of up to 97% for Ibuprofen (IBF) followed by (94%) acetaminophen (ACE) and (70%) streptomycin (STR) for a concentration of 12 mg L−1. The adsorption process was found to follow the pseudo-second-order kinetics and fits well with the Langmuir isotherm model, confirming the adsorption on to the homogenous surface of the nanocomposite. The amine functional groups formed on the nickel ferrite nanocomposites by coating aminopropyltrimethoxysilane (APTS) were observed to aid the adsorption process. The adsorption capacity of the nanocomposites varies for IBF, ACE, and STR as 59, 58, and 49 mg g−1 at pH 7.0, 6.0, and 5.0, respectively. The amine coated magnetic nanocomposite also showed excellent regeneration capacity for up to four cycles and can be a promising adsorbent, especially for removing of pharmaceutical pollutants from aqueous streams.

Effect of silane/amine-based dopants on polymer-metal interaction of sub-surface silver nanoparticulate films

The optical and morphological properties of the vacuum-evaporated silver (Ag) nanoparticulate films on softened polyvinyl alcohol (PVA) modified with the 3-mercaptopropyl trimethoxysilane (MPTMS) and 3-aminopropyl trimethoxysilane (APTMS) dopants are reported. The topography of the particulate films is characterized by the field-emission scanning electron microscopy. The optical spectra broadening, red-shift, and the increase in the intensity values of the plasmonic resonance peak with the nature of dopant have a strong dependence on the particle size, shape, and inter-particle separation. The conducted experimental optical studies are supported by Finite Difference Time-Domain (FDTD) simulation results. Quantitative analysis of the Fourier-Transform Infrared Spectroscopy (FTIR) and Raman Spectroscopy studies confirm the surface modification of Ag nanoparticulate films on doped PVA substrates. The amount of polymer-metal interaction caused by the strongly interacting silane groups of the dopants and their influence on the morphology and optical properties are discussed.

Tuning Cell Behavior on 3D Scaffolds Fabricated by Atmospheric Plasma-Assisted Additive Manufacturing.

Three-dimensional (3D) scaffolds with optimum physicochemical properties are able to elicit specific cellular behaviors and guide tissue formation. However, cell–material interactions are limited in scaffolds fabricated by melt extrusion additive manufacturing (ME-AM) of synthetic polymers, and plasma treatment can be used to render the surface of the scaffolds more cell adhesive. In this study, a hybrid AM technology, which combines a ME-AM technique with an atmospheric pressure plasma jet, was employed to fabricate and plasma treat scaffolds in a single process. The organosilane monomer (3-aminopropyl)trimethoxysilane (APTMS) and a mixture of maleic anhydride and vinyltrimethoxysilane (MA-VTMOS) were used for the first time to plasma treat 3D scaffolds. APTMS treatment deposited plasma-polymerized films containing positively charged amine functional groups, while MA-VTMOS introduced negatively charged carboxyl groups on the 3D scaffolds’ surface. Argon plasma activation was used as a control. All plasma treatments increased the surface wettability and protein adsorption to the surface of the scaffolds and improved cell distribution and proliferation. Notably, APTMS-treated scaffolds also allowed cell attachment by electrostatic interactions in the absence of serum. Interestingly, cell attachment and proliferation were not significantly affected by plasma treatment-induced aging. Also, while no significant differences were observed between plasma treatments in terms of gene expression, human mesenchymal stromal cells (hMSCs) could undergo osteogenic differentiation on aged scaffolds. This is probably because osteogenic differentiation is rather dependent on initial cell confluency and surface chemistry might play a secondary role.

NOVO ADSORVENTE NANOESTRUTURADO HÍBRIDO DO TIPO AMINA/KIT-6 PARA CAPTURA DE CO2

NEW HYBRID NANOSTRUCTURED ADSORBENT TYPE AMINE/KIT-6 FOR CO2 CAPTURE. The present work functionalized KIT-6 mesoporous material with aminopropyltrimethoxysilane (APTMS) and tested its efficiency in CO2 capture. The KIT-6 material was synthesized by hydrothermal method and functionalized via excess solvent in APTMS concentrations of 5 and 15% to obtain the hybrid adsorbents. All adsorbent materials were characterized by XRD, TGA/DTGA, DSC, N2 adsorption/desorption, SEM and applied in the CO2 capture, varying the temperature and pressure. The KIT-6 mesoporous structure at the hybrid adsorbents was kept. Variations in textural properties denoted that the organic molecules were incorporated in mesoporous structure. In the experiments, both chemisorption and physisorption were observed, reaching the best values at 25 ºC, indicating that the temperature influences the adsorption process. The experiments showed adsorbed amounts of up to 0.8 mmol/g at atmospheric pressure, displaying the efficiency of the chemisorption provided by the CO2 interaction with the hybrid adsorbents. At high pressures, a predominance of physisorption was observed, demonstrating a better performance for the KIT-6 support, due to the superior textural properties. Finally, a well-ordered and functional hybrid adsorbent was successfully developed for the adsorption of carbon dioxide

Ampicillin adsorption onto amine-functionalized magnetic graphene oxide: synthesis, characterization and removal mechanism

There are various chemical, physical and biological methods that have been applied to remove antibiotic residuals from aqueous environment. We investigated the removal of ampicillin (AMP) by a novel nanometer-size Fe3O4/graphene oxide/aminopropyltrimethoxysilane (FGOA). Based on the sol-gel method, the graphene oxide (GO) was first modified by aminopropyltrimethoxysilane (APTMS) to form GOA material containing both acidic and basic surface functional groups. The nanomagnetic iron oxide was then decorated to the GOA surface at various weight ratios by ultra-sonication in ethanol, resulting in different FGOA samples. The as-synthesized FGOA had single-layer structure and parallel array-like well-distributed Fe3O4. In laboratory-scale, the AMP treatment efficiency by FGOA with the ratio of Fe3O4: GOA as 1:5 ratio reached the highest value around 94% within 100 min and only lost 1% after five regeneration cycles. The maximum adsorption capacity of FGOA was 294mg g−1, significantly much higher than the previously published materials applied to AMP uptake. Interestingly, the optimum pH of FGOA ranged extensively from 4 to 9, revealing high application potential to real wastewater without any pH adjustment. The reasonable mechanism might be mainly attributed to electrostatic attraction, hydrophilic, and π-π interaction.

Synthesis and characterization of chloromethyl-calix[4]arene-grafted silylated clay nanocomposite

In this study, we report the synthesis and characterization of novel nanocomposite namely doubly functionalized chloromethyl-calix[4]arene-methoxy grafted silylated clay (SC-C[4]). The silylation of nanoclay (thickness of the sheets ≈ 1 nm) was performed using (3-aminopropyl)trimethoxysilane (APTMS) (height ≈ 4.55 A) coupling agent. The resulting organoclay was characterized by various techniques such as X-ray diffraction (XRD), infrared spectroscopy (IR), thermal gravimetric analysis (TGA), and 29Si and 13C solid-state NMR. The XRD results suggested the presence of a double layer of silanes molecules into the clay galleries of nanoclay minerals by increasing in the basal spacing. While the IR, 29Si and 13C solid-state NMR, and TGA analysis demonstrated the successful silylation of clay by the appearance of novel absorption bands, the changes in the chemical environment and the peaks degradation in the range 200 to 500 ° C related to aminosilane molecules, respectively. The calix[4]arenes derivatives were synthesized and characterized by IR spectroscopy and 1HNMR. The results showed that calix[4]arene was functionalized at the lower and upper rim. The grafting of the doubly functionalized calix[4]arene onto clay surfaces was performed through nucleophilic reaction. Structure, thermal properties of the nanocomposite SC-C[4] were also investigated. All data approved the successful grafting of para-chloromethyl-calix[4]arene-OMe onto clay surfaces.

Amine-Functionalized Nanoporous Silica Monoliths for Heterogeneous Catalysis of the Knoevenagel Condensation in Flow.

Porous carrier materials functionalized with organocatalysts offer substantial advantages compared to homogeneous catalysts, e.g., easy separation of the catalyst, scalability, and an improved implementation in continuous operations. Here, we report the immobilization of (3-aminopropyl)trimethoxysilane (APTMS) onto self-prepared silica monoliths and its application as a heterogeneous catalyst in the Knoevenagel condensation between cyano ethylacetate and various aromatic aldehydes under continuous-flow conditions. The meso-macroporous silica monoliths (6–7 cm in length) were optimized to be used in flow taking advantage of their hierarchical meso- and macroporosity. The monoliths were cladded with a poly(ether ether ketone) (PEEK) tube by a refined procedure to guarantee tight connection between the carrier material and PEEK. Functionalization of the bare silica monoliths consisting of APTMS can be efficiently performed in flow in ethanol and toluene. While a large grafting gradient is obtained for toluene, the grafting in ethanol proceeds homogenously throughout the monolith, as evidenced by elemental analysis and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The silica monoliths exhibit high conversion up to 95% with concurrent low back pressures, which is of importance in flow catalysis. By connecting two monoliths, high conversions can be maintained for several flow rates. Two types of monoliths were synthesized, possessing different mesopore sizes. The monolith bearing the larger mesopore size showed an enhanced turnover frequency (TOF), while the monolith with the smaller mesopores allowed for larger quantities of the product to be synthesized, due to the higher surface area. A long-term stability test showed that the functionalized monoliths were still active after 66 h of continuous usage, while the overall yield decreased over time.

Lights and Shadows of Gold Introduction into Beta Zeolite.

Four different methods for gold deposition on Beta zeolite, namely impregnation, ion-exchange, deposition-reduction, and grafting on (3-aminopropyl)trimethoxysilane functionalized support, were applied to investigate their influence on textural/structural changes in the zeolite support and its surface acidity. The as-prepared materials were fully characterized by XRD, N2 physisorption, ICP-OES, XPS, TEM, and pyridine adsorption. The obtained results indicated that bifunctional redox–acidic materials prepared within this work were characterized not only by different gold loading and gold particle size, but also different textural parameters and acidity. All these features were strongly affected by the procedure applied for gold deposition. The introduction of Au into Beta zeolite by ion exchange caused a significant decrease in the Si/Al ratio in the zeolite framework. The size of Au particles determined the textural parameters of the zeolite and the number of Lewis acid sites (LAS). The Brønsted acid sites (BAS) number was decreased if (3-aminopropyl)trimethoxysilane or NaBH4 were used in the procedure of gold deposition. The highest BAS/LAS ratio was achieved for the sample prepared by ion exchange in the ammonium form of Beta zeolite. The presented results permit making a proper choice of the gold modification procedure for the preparation of bifunctional (redox–acidic) materials, addressed to a desired application.

Thermally stable amine-functionalized silica sorbents using one-pot synthesis method for CO2 capture at low temperature

Amine-functionalized silica sorbents have been widely investigated for post-combustion CO2 capture at low temperature. In previous studies, amine-functionalized silica sorbents were prepared using a synthetic hierarchically porous silica, which is not commercially available in large quantities, because porous silica support structures strongly influence CO2 capture performance. Here, we propose a feasible and facile fabrication method for amine-functionalized silica sorbents using 3-aminopropyltrimethoxy silane (APTS) and fumed silica (FS), where APTS serves as both an active material and a binder. The APTS-functionalized FS sorbents have large amounts of active amino groups and porous structures and demonstrate good multicycle stability with excellent CO2 capture performance. In addition, cetyltrimethylammonium bromide was found to improve the diffusion pathway of CO2, leading to enhanced CO2 capture capacity because of the suppression of excessive condensation during preparation. Therefore, the APTS-functionalized FS sorbents could be cost- and energy-efficiently prepared using a novel one-pot synthesis method; the resulting sorbents exhibit excellent CO2 capture performance.

Catalysis and specificity of the polycondensation of aminopropyltrimethoxysilane on nucleic acids

The polycondensation of a silane derivative such as aminopropyltrimethoxysilane (ATMS) in the presence of nucleic acids has never been investigated. Our group has previously demonstrated that in chloroform ATMS hydrolysis and polycondensation were faster when the reaction were carried out in the presence of double stranded DNA (146 bp). The results showed that the kinetics of ATMS hydrolysis was affected by the base type used, a fast hydrolysis reaction rate being observed with nucleotide molecules containing adenosine group, and that in the absence of water the amino group of deoxyadenosine units, and not the hydroxylic group of the sucrose residue, can react with ATMS methoxy groups. The present work was initiated aiming at providing a better understanding of this effect. It was observed that the polymerization degree of oligodeoxyadenylate has a clear impact on the kinetic of reaction this effect being as much important as the polymerization degree of the oligodeoxyadenylate was high. Structural investigation by molecular modeling showed that this enhanced reactivity can be explained by conformational effects. Altogether, these results are accounted for assuming that DNA can act as a specific template for ATMS polycondensation, in organic medium such as chloroform, opening the way to possible DNA encapsulation, and a new way for DNA chemical modification in organic solvent.

Preparation of isocyanate-free composite coating with controlled molecular architecture: A new convergent approach to functional macromolecules

Isocyanate-free composite coating can improve radiative cooling, energy storage and harvesting applications. This study reports the development and use of a isocyanate-free green surface coating(GSC) matrix derived from (2,2,6,6-tetramethylpiperidin-1-yl)oxy radical (TEMPO)-oxidized cellulose-(3-Aminopropyl)trimethoxysilane (APTMS)-ZnO nanoparticles-green polymer matrix that possesses upto ∼220 °C thermal stability. The GSC exhibited excellent UV block and IR active capacity while achieving good coating hardness. The NMR, TGA-DTG and Pencil hardness studies revealed that this attribute by GSC was due to the formation of uniform crosslinking and reinforcement network. Using electrochemical impedance spectroscopy, the GSC had a low resistance. A high charge transfer resistance of ∼15.826 kΩ was measured using electrochemical impedance spectroscopy for the GSC, high enough to attenuate photon radiation, making GSC material stable for application. Also, UV-weathering study was performed to investigate coating stability of the GSC. This is the first time application of TEMPO-cellulose based reinforcement of the green polymer matrix for the development of GSC through convergent approach to functional macromolecules. The study opens an opportunity of utilizing green material in energy applications, especially in windows shielding by a sufficient attenuation of photon radiations.

Synergetic Effect of Dopamine and Alkoxysilanes in Sustainable Non-Isocyanate Polyurethane Adhesives.

The preparation of non-isocyanate polyurethanes (NIPUs) by polyaddition of (poly)cyclic carbonates to (poly)amines represents one of the most optimistic alternatives for replacing conventional polyurethanes prepared by the toxic isocyanate chemistry. However, the limited reactivity of conventional five membered cyclic carbonates even in the presence of catalysts restricts their industrial implementation. One way to mitigate this lack of reactivity is to combine with other chemistries to create hybrid-NIPUs with superior performance. In this article the combination of the adhesive promoter, dopamine, and the fast-curing promoter, an aminopropyl trimethoxysilane, is found to create a synergetic effect on the rheological and adhesive properties of NIPUs. After demonstrating the importance of adjusting soft/hard ratios to obtain lap-shear strength adhesion values up to 21MPa on stainless steel, these values are retained when adding dopamine and silane compounds. Importantly, the adhesive properties of NIPU are preserved at high temperature (T>200°C) for optimal compositions. Finally, adhesion tests on various substrates (polyamide, high density polyethylene, poly(methyl methacrylate), oak wood, and aluminum) show best performances on polar substrates confirming the strong interactions of hydroxyl groups of NIPU and dopamine.