Tertiary Ammonium Cations Research Articles

Exogenous Metal Cations in the Synthesis of CsPbBr3 Nanocrystals and Their Interplay with Tertiary Amines.

Current syntheses of CsPbBr3 halide perovskite nanocrystals (NCs) rely on overstoichiometric amounts of Pb2+ precursors, resulting in unreacted lead ions at the end of the process. In our synthesis scheme of CsPbBr3 NCs, we replaced excess Pb2+ with different exogenous metal cations (M) and investigated their effect on the synthesis products. These cations can be divided into two groups: group 1 delivers monodisperse CsPbBr3 cubes capped with oleate species (as for the case when Pb2+ is used in excess) and with a photoluminescence quantum yield (PLQY) as high as 90% with some cations (for example with M = In3+); group 2 yields irregularly shaped CsPbBr3 NCs with broad size distributions. In both cases, the addition of a tertiary ammonium cation (didodecylmethylammonium, DDMA+) during the synthesis, after the nucleation of the NCs, reshapes the NCs to monodisperse truncated cubes. Such NCs feature a mixed oleate/DDMA+ surface termination with PLQY values of up to 97%. For group 1 cations this happens only if the ammonium cation is directly added as a salt (DDMA-Br), while for group 2 cations this happens even if the corresponding tertiary amine (DDMA) is added, instead of DDMA-Br. This is attributed to the fact that only group 2 cations can facilitate the protonation of DDMA by the excess oleic acid present in the reaction environment. In all cases studied, the incorporation of M cations is marginal, and the reshaping of the NCs is only transient: if the reactions are run for a long time, the truncated cubes evolve to cubes.

Synthesis of different organic ammonium-based bismuth iodide perovskites for photodetection application.

Bismuth-based perovskites are promising candidates for highly stable halide perovskites with low toxicity. Here, we report the synthesis of a series of bismuth iodide-based perovskites with different primary, secondary, and tertiary ammonium cations and study their structural, thermal, and optical properties, and the likelihood of photodetection. Interestingly, the variation of A-site organic ammonium cations, with different interlayer spacings between adjacent bismuth iodide monolayers, has exotic effects on the diffraction patterns and morphological structures of the perovskite crystals. Thermogravimetric analysis reveals the highest thermal stability of tertiary ammonium-based bismuth perovskite with a decomposition temperature of 385 °C. The branched primary ammonium-based photodetector has photo-responsivity roughly two and four times faster than that of secondary and tertiary ammonium-based devices, respectively. These findings provide insight into the importance of A-site cation engineering for structural modulation and tailoring the optoelectronic properties of bismuth-based perovskites for emerging optoelectronic devices.

Outstanding lubrication properties of carbon dot-based ionic liquids

Although carbon dots (CDs) have attracted much attention due to their excellent lubricity and high load-carrying capacity as lubricant additives, the deficiency of easy agglomeration and the feature of solid state still restrict the application of CDs in the field of lubrication engineering. In order to break through the above limitations, novel liquid CD materials, carbon dot-based ionic liquids (CDILs), were synthesized via ionic modification of CDs with organic ammonium cations endowing new functions as novel liquid lubricants, which demonstrates that CDILs provide better lubrication performance than classical ILs ([BMIM][BF4]) and at room and high temperature (30 °C and 100 °C). More importantly, the newly synthesized [N888H][CDs] containing tertiary ammonium cations with long alkyl chains exhibits the best lubrication performance. The resultant analyses give direct evidence that CD anions play a surprising role in improving the lubricity and protecting the steel/steel friction pairs, growing robust tribofilm with abundant CDs on the worn surfaces. Hence, it can not only offer fundamental insights into the formation of the tribofilm, but also provide a method for modifying CDs to promote their lubricity as liquid lubricants.

Comparisons of NH…O and OH…O hydrogen bonds in various ethanolammonium–based protic ionic liquids

The effect of a number of terminal OH groups in tertiary ammonium cations (triethanolammonium, ethyldiethanolammonium, diethylethanolammonium, and triethylammonium) on structural and energetic characteristics of the ion pairs resulted from the acid–amine interaction with six different sulfonic acids was investigated. The ion pairs have been studied in detail from energetic and structural point of view by means of the B3LYP-GD3 dispersion-corrected density functional theory with further analysis of electron density function based on the Bader method. The topological properties of the electron density distributions for NH…O and ОH…O bonding interactions have been considered as well as their energies estimated by Espinosa approach. It was shown that the presence of OH groups in the cation leads to increasing structural stability of the ion pairs due to additional hydrogen bonding with acid anion. While the number of hydrogen bonds between cation and anion in the ion pair raises, the strength of each NH…O and ОH…O interaction is becoming weaker. The stronger interactions of the NH proton of the cation are evident in all the ion pairs studied. A thorough analysis of the interaction data on the ion pairs allows us to make the conclusion that the interaction energy of the ion pairs increases in the cation order TEA < DEEOA < EDEOA < TEOA, with the sequence of anions being TfO < NBsu < SA < Bsu < MTN < MsO.

Effect of ionic liquids on the fluorescence properties and aggregation of superfolder green fluorescence protein

Proteins generally tend to aggregate with less desirable properties in numerous solvents, which is one of the major challenges in the development of solvents for functional proteins. This work aims to utilize fluorescence spectroscopy and small angle X-ray scattering (SAXS) to understand the effects of ionic liquids (ILs) on the fluorescence and aggregation behavior of superfolder green fluorescent protein (sfGFP). The studied ILs consisted of four different anions coupled with primary, tertiary and quaternary ammonium cations. The results show that the chromophore fluorescence was generally maintained in 1 mol% IL-water mixtures, then decreased with increasing IL concentration. We primarily employed the pseudo-radius of gyration (pseudo-Rg) to evaluate sfGFP aggregation. The sfGFP was less aggregated with nitrate-based ILs compared to in buffer, and more aggregated in the mesylate-based ILs. Further, we show that the polyol additives of glycerol and glucose in IL-water mixtures slightly decreased the sfGFP propensity to aggregate. Size-exclusion chromatography (SEC)-SAXS was used to characterize the monomeric sfGFP in ethylammonium nitrate (EAN) and triethylammonium mesylate (TEAMs)-water mixtures. The presence of 1 mol% TEAMs maintained the sfGFP fluorescence, promoted the compact structure, but slightly increased the amount of large aggregates, which contrasted with that of EAN.

Multifunctional molecules of surfactant to support enhanced efficiency and stability for perovskite solar cells

As the darling of new era, perovskite solar cells (PSCs) have drawn extensive attention because of their tremendous commercial potentials. However, many different types of defects are easily formed during the fabrication process of perovskite films, such as cation and anion vacancy, under-coordinate metal ions, humidity erosion and so on, which are detrimental to the efficiency and long-term stability of the devices. To decrease the charge trap density and improve the moisture resistance of the perovskite film, here, we introduce a multifunctional surfactant, cetyl trimethyl ammonium bromide (CTAB), into perovskite precursor solution to both passivate the two types of ionic vacancies and also enhance the humidity resistance. Benefiting from Br and quaternary cetyl tertiary ammonium cations filled up on X- and A-sites, fluorescence spectrum revealed that moderate CTAB doped perovskite films showed decreased defects and inhibited carrier recombination. Consequently, ternary cation perovskite solar cells with optimized CTAB additives deliver an enhanced champion power conversion efficiency (PCE) of 20.54% and outstanding long-range stability with 94.3% of the initial efficiency after 2000 h without encapsulation in N2 atmosphere.

Understanding the Role of Protic Ionic Liquids (PILs) in Reactive Systems: Rational Selection of PILs for the Design of Green Synthesis Strategies for Allylic Amines and β-Amino Esters.

The reactive behaviour of protic ionic liquids (PILs) has been shown to be governed not only by their chemical structures but also by their global compositions, which include the presence of free acids and bases at equilibrium with ionic pairs. Six PILs composed of primary, secondary, or tertiary alkyl ammonium cations with two couterions, nitrate or acetate, were tested in model reactions with unsaturated substrates. The free species that were naturally present in these liquids were identified by cyclic voltammetry. Only tributylammonium nitrate was found to be mostly composed just of the ionic pair; the other five PILs also contain variable amounts of free acid and amine. In reactive systems, these free species determine the products of the reaction. In particular, allylic amines and β-amino esters were obtained in good yields (91 and 75 %, respectively) by reaction of conjugated dienes and acrylates in the presence of PILs. By taking into account the actual composition of each PIL, it was possible to direct the reaction path towards a specific product with good yields, to ensure acid catalysis, to avoid polymerization of the substrate, and to promote phase transfer of products. These results establish some useful guidelines for the rational design of new PIL-based one-step synthetic strategies.

Emergent Properties of Antiagglomerant Films Control Methane Transport: Implications for Hydrate Management.

The relationship between collective properties and performance of antiagglomerants (AAs) used in hydrate management is handled using molecular dynamics simulations and enhanced sampling techniques. A thin film of AAs adsorbed at the interface between one flat sII methane hydrate substrate and a fluid hydrocarbon mixture containing methane and n-dodecane is studied. The AA considered is a surface-active compound with a complex hydrophilic head that contains both amide and tertiary ammonium cation groups and hydrophobic tails. At a sufficiently high AA density, the interplay between the surfactant layer and the liquid hydrocarbon excludes methane from the interfacial region. In this scenario, we combine metadynamics and umbrella sampling frameworks to study accurately the free-energy landscape and the equilibrium rates associated with the transport of one methane molecule across the AA film. We observe that the local configurational changes of the liquid hydrocarbon packed within the AA film are associated with high free-energy barriers for methane transport. The time scales estimated for the transport of methane across the AA film can be, in some cases, comparable to those reported in the literature for the growth of hydrates, suggesting that one possible mechanism by which AAs delay the formation of hydrate plugs could be providing a barrier to methane transport. Considering the interplay between the structural design and collective properties of AAs might be of relevance to improve their performance in flow assurance.

High-efficiency surfactant prepared from phenolic resin for multi-walled carbon nanotube aqueous suspension

Carbon nanotubes (CNTs) have been widely exploited to be used in many fields due to its perfect mechanical properties, but CNT agglomerates severely prevent CNTs’ excellent properties from performing. Many dispersants were synthesized to resolve the difficulty reported in recent years. In this paper, a healthier and cheaper dispersant with phenolic resin as original reagent was synthesized (denoted as AEP-4). Fourier transform infrared spectroscopy, nuclear magnetic resonance, and mass spectra were carried out to characterize chemical structure of reagent and products. Ultraviolet–visible spectroscopy and transmission electron microscopy were employed to evaluate the dispersibility of multi-walled carbon nanotubes (MWCNTs) in aqueous solution. The results showed that AEP-4 containing tertiary ammonium cations exhibited strong ability to disperse MWCNTs in aqueous solution, which showed better dispersion ability than sodium dodecyl benzene sulfonate. The scanning electron microscope results of MWCNT/carbon fiber reinforcements showed that many single MWCNTs showed up and uniformly covered carbon fiber surface in the case of carbon fiber treated by MWCNT/AEP-4 suspension, which reflected that MWCNT suspension with AEP-4 had good dispersion.

Evidence of Structure-Performance Relation for Surfactants Used as Antiagglomerants for Hydrate Management

Molecular dynamics simulations were employed to study the structure of molecularly thin films of antiagglomerants adsorbed at the interface between sII methane hydrates and a liquid hydrocarbon. The liquid hydrocarbon was composed of dissolved methane and higher-molecular-weight alkane such as n-hexane, n-octane, and n-dodecane. The antiagglomerants considered were surface-active compounds with three hydrophobic tails and a complex hydrophilic head that contains both amide and tertiary ammonium cation groups. The length of the hydrophobic tails and the surface density of the compounds were changed systematically. The results were analyzed in terms of the preferential orientation of the antiagglomerants, density distributions of various molecular compounds, and other molecular-level properties. At low surface densities, the hydrophobic tails do not show preferred orientation, irrespectively of the tail length. At sufficiently high surface densities, our simulations show pronounced differences in the structure of the interfacial film depending on the molecular features and on the type of hydrocarbons present in the system. Some antiagglomerants are found to pack densely at the interface and exclude methane from the interfacial region. Under these conditions, the antiagglomerant film resembles a frozen interface. The hydrophobic tails of the antiagglomerants that show this feature has a length comparable to that of the n-dodecane in the liquid phase. It is possible that the structured interfacial layer is in part responsible for determining the performance of antiagglomerants in flow-assurance applications. The simulation results are compared against experimental data obtained with the rocking cell apparatus. It was found that the antiagglomerants for which our simulations suggest evidence of a frozen interface at sufficiently high surface densities are those that show better performance in rocking cell experiments.

Unexpected Reaction Promoted by NH+···O=Mo Hydrogen Bonds in Nonpolar Solvents

A new synthetic method using [MoIV(S‐tBu)4], 1,2‐benzenedithiol containing bulky hydrophobic acylamino substituents, 3,6‐[(4‐tBuC6H4)3CCONH]2C6H2‐1,2‐(SH)2 (LH2), a tertiary amine [R3N = Et3N or 2,6‐lutidine (Lu)], and an equimolar amount of water afforded (R3NH)2[MoIVO(L)2] [(R3NH)2[1]]. Each compound formed a strong NH+···O=Mo hydrogen bond between the tertiary ammonium cation and the terminal oxo ligand in toluene, which unexpectedly promoted the one‐electron oxidation of MoIV by lutidinium ion or 0.5 equiv. Me3NO to produce [MoVO(L)2]–. In contrast, in polar solvents, typical oxygen atom transfer (OAT) from Me3NO to [1]2– was observed. A possible mechanism is presented and the role of the hydrogen bond in molybdenum enzymes is discussed.

Understanding the Influence of Key Ionic Liquid Properties on the Hydrolytic Activity of Thermomyces lanuginosus Lipase

AbstractIonic liquids (ILs) are solvents with numerous properties, which have been recently used for enzyme catalysis. In this work, five different ILs based on primary, tertiary, and quaternary ammonium cations coupled with mesylate and propionate anions were used as media for hydrolysis by the industrially relevant enzyme Thermomyces lanuginosus lipase (TLL). We correlated the TLL activity with various key IL and IL–water properties, including ion concentration, water activity (aw), kosmotropicity, hydrogen‐bond basicity (β), and pH. The ion concentration was associated with aw, and the molar ratio of water/IL 5:1 (aw≈0.6) was found to be the threshold for assured TLL activity. Triethylammonium mesylate was the best IL owing to its kosmotropicity and ideal intrinsic β. The pH of IL–water mixtures is a key parameter related to the conformational change of TLL. We demonstrated the pH effect of the IL–water mixtures can be overcome by buffering, and the buffered system displayed the greatest activity.

Functionalization of perovskite thin films with moisture-tolerant molecules

Organic–inorganic hybrid perovskites are particularly suited as light-harvesting materials in photovoltaic devices. The power conversion efficiency of perovskite solar cells has reached certified values of over 20% in just a few years. However, one of the major hindrances for application of these materials in real-world devices is the performance degradation in humid conditions, leading to a rapid loss of photovoltaic response. Here, we demonstrate that hydrophobic tertiary and quaternary alkyl ammonium cations can be successfully assembled on the perovskite surface as efficient water-resisting layers via a facile surface functionalization technique. Such layers can protect the perovskite film under high relative humidity (90 ± 5%) over 30 days. More importantly, devices based on such films can retain the photovoltaic capacities of bulk perovskites, with power conversion efficiencies over 15%. Improving the humidity tolerance of perovskite materials is a necessary step towards large-scale production of high-performance perovskite-based devices under ambient humidity. Organic–inorganic perovskites are promising materials for photovoltaic devices, however they have poor tolerance to ambient humidity. Now, their surface can be functionalized with water-resistant molecules to stabilize their performance under humid conditions.

Assessing the mutagenicity of protic ionic liquids using the mini Ames test

Protic ionic liquids (PILs) have been suggested as “greener” alternatives to conventional solvents in various industrial applications. In order to assess their suitability for such purposes, a thorough evaluation of their toxicity, mutagenicity, carcinogenicity and environmental impact is crucial. Whilst some studies have been published concerning the biodegradability and toxicity towards microorganisms of a limited number of PILs, no data concerning the mutagenicity of any PIL exist within the literature. As part of our ongoing studies into the toxicity and environmental impact of PILs, we quantify herein the mutagenic potential of a range of PILs through the mini Ames test. In total, 16 PILs and two precursor amines were assessed based on the Ames test, using Salmonella typhimurium strains TA98 and TA100. The 16 PILs used in this study included both carboxylate and chloride anions, as well as secondary and tertiary ammonium cations. Our results show that out of the 16 PILs, 15 gave negative results to the mini Ames test, concluding that they are unlikely to be either mutagenic or carcinogenic. The PIL N,N-Dimethylethanolammonium Octanoate ([DMEtA][Oct]) was toxic to both test strains, and its mutagenic potential could not be assessed by the mini Ames test. The two precursor amines, diethanolamine and N,N-dimethylethanolamine, gave negative results to the mini Ames tests despite the suggestion from other mutagenicity tests of diethanolamine’s suggested carcinogenicity. 15 PILs have been deemed likely to be neither mutagenic nor carcinogenic in accordance with the mini Ames test. We find that these results compare well to the relevant carboxylic acids and amines from the literature, suggesting that PILs exist as well solvated ions in these test conditions, similar to those of their precursors in the same test. From this, we caution the use of secondary ammonium cations in PILs, as certain secondary amines have been suggested to be potentially carcinogenic, despite their results from the mini Ames test.

Carbon Dioxide Retention on Bentonite Clay Adsorbents Modified by Mono-, Di- and Triethanolamine Compounds

A series of organic-inorganic hybrids were developed via intercalation process of primary, secondary and tertiary ammonium cations into different alkali and alkaline earth and transition metal cation forms of bentonite clay to be used as adsorbent materials for CO2capture under ambient temperature and slightly high pressure. The effect of the molar mass of amines on the structural characteristics, surface properties and CO2loading capacity of bentonite clay were investigated by X-ray diffraction, Brunauer-Emmett-Teller method and Magnetic Suspension Balance equipment, respectively. X-ray diffraction results revealed that the basal spacing of bentonite clay after modification with amines was increased with the molar mass of amine used, while BET results showed an inverse effect of the molar mass of amines on the surface area of the synthesized materials. The CO2loading capacity of the examined samples revealed that bentonite clay modified with monoethanolammonium cations retained higher CO2amount compared to those modified with di-and triethanolammonium cations. CO2adsorption isotherms on MEA+-Mg-MMT were conducted at 298, 323 and 348 K and different pressures. A decrease in CO2uptake with increasing temperature was observed, suggesting the exothermic nature of the adsorption process.

Influence of Different Organoclays on the Curing, Morphology, and Dynamic Mechanical Properties of an Epoxy Adhesive

The thermal, mechanical, and adhesive properties of nanoclay-modified adhesives were investigated. Two organically modified montmorillonites: Cloisite 93A (C93A) and Nanomer I.30E (I.30E) were used as reinforcement of an epoxy adhesive. C93A and I.30E are modified with tertiary and primary alkyl ammonium cations, respectively. The aim was to study the influence of the organoclays on the curing, and on the mechanical and adhesive properties of the nanocomposites. A specific goal was to compare their behavior with that of Cloisite30B/epoxy and Cloisite15A/epoxy nanocomposites that we have previously studied. Both C30B and C15A are modified with quaternary alkyl ammonium cations. Differential scanning calorimetry results showed that the clays accelerate the curing reaction, an effect that is related to the chemical structure of the ammonium cations. The three Cloisite/nanocomposites showed intercalated clay structures, the interlayer distance was independent of the clay content. The I.30E/epoxy nanocomposites presented exfoliated structure due to the catalytic effect of the organic modifier. Clay-epoxy nanocomposites showed lower glass transition temperature (T g ) and higher values of storage modulus than neat epoxy thermoset, with no significant differences between exfoliated or intercalated nanocomposites. The shear strength of aluminum joints using clay/epoxy adhesives was lower than with the neat epoxy adhesive. The water aging was less damaging for joints with I.30E/epoxy adhesive.

1.55 Å-resolution structure of ent-copalyl diphosphate synthase and exploration of general acid function by site-directed mutagenesis

BackgroundThe diterpene cyclase ent-copalyl diphosphate synthase (CPS) catalyzes the first committed step in the biosynthesis of gibberellins. The previously reported 2.25Å resolution crystal structure of CPS complexed with (S)-15-aza-14,15-dihydrogeranylgeranyl thiolodiphosphate (1) established the αβγ domain architecture, but ambiguities regarding substrate analog binding remained. MethodUse of crystallization additives yielded CPS crystals diffracting to 1.55Å resolution. Additionally, active site residues that hydrogen bond with D379, either directly or through hydrogen bonded water molecules, were probed by mutagenesis. ResultsThis work clarifies structure–function relationships that were ambiguous in the lower resolution structure. Well-defined positions for the diphosphate group and tertiary ammonium cation of 1, as well as extensive solvent structure, are observed. ConclusionsTwo channels involving hydrogen bonded solvent and protein residues lead to the active site, forming hydrogen bonded “proton wires” that link general acid D379 with bulk solvent. These proton wires may facilitate proton transfer with the general acid during catalysis. Activity measurements made with mutant enzymes indicate that N425, which donates a hydrogen bond directly to D379, and T421, which hydrogen bonds with D379 through an intervening solvent molecule, help orient D379 for catalysis. Residues involved in hydrogen bonds with the proton wire, R340 and D503, are also important. Finally, conserved residue E211, which is located near the diphosphate group of 1, is proposed to be a ligand to Mg2+ required for optimal catalytic activity. General significanceThis work establishes structure–function relationships for class II terpenoid cyclases.

STRUCTURE AND PROPERTIES OF NANOCOMPOSITE MATERIAL FROM UNSATURATED POLYESTER AND POLY (ETHYLENE OXIDE) – MODIFIED CLAY

In recent years, polymer clay nanocomposites are attracting considerable interests in polymers science because of many advantages. There are many scientists having researched about this kind of material and demonstrated that when matrix polymer is added little weight of clay, properties of material is enhanced considerably. Because clay is a hydrophilic substance so it is difficult to use as filler in matrix polymer having hydrophobic nature, so clay needs to be modified to become more hydrophobic. In this study, Poly (Ethylene Oxide) was used as a new modifier for clay to replace some traditional ionic surfactants such as primary, secondary, tertiary, and quaternary alkyl ammonium or alkylphosphonium cations having disadvantages: disintegrate at high temperature, catalyze polymer degradation, and make nano-products colorific…. In order to evaluate modifying effect of Poly (Ethylene Oxide), modified clay products were characterized by X-ray spectrum. And then organoclay was used to prepare nanocomposite based on Unsaturated Polyester. Morphology and properties of nanocomposites were measured by X-ray diffraction, Transmission electron microscopy, tensile strength and thermal property. The results show that clay galleries changed to intercalated or exfoliated state in the nanocomposites. Properties of nanocomposites were (significantly improved) improved a lots when the loading of the organoclay was used at 1phr.

Vesicles and lamella: outcome of the changing formation path of a sodium N-lauroylsarcosinate hydrate/1-decanol/water system

AbstractVesicles are closed bilayers that enclose a part of the continuous phase inside the core. In spherical shape, they attain the minimum free energy state. Conversely, lamella with maximum free energy remain in planer bilayer shape in the colloidal dispersion. Even with the same amphiphile concentration the colloidal structures depend on different parameters, many of these already addressed in different reports. However, the effect of mixing procedure as a formation path is unidentified. Here we reported water in 1-decanol and 1-decanol in water; these two different mixing procedures yield vesicles and lamella at the same point of the phase diagram of a sodium N-lauroylsarcosinate hydrate/1-decanol/water system. It was found that the favorable and unfavorable contact of water with the weak tertiary ammonium cation in amino-acid head-group plays the crucial role in this process. Moreover, this weak cationic property of this amphoteric surfactant can be exploited to carry DNA for gene therapy with a nontoxic system instead of cationic.

Study Structure and Properties of Nanocomposite Material Based on Unsaturated Polyester with Clay Modified by Poly(ethylene oxide)

In recent years, polymer clay nanocomposites have been attracting considerable interests in polymers science because of their advantages. There are many scientists who researched about this kind of material and demonstrated that when polymer matrix was added to little weight of clay, properties were enhanced considerably. Because clay is a hydrophilic substance so it is difficult to use as filler in polymer matrix having hydrophobic nature, so clay needs to be modified to become compatible with polymer. In this study, poly(ethylene oxide) was used as a new modifier for clay to replace some traditional ionic surfactants such as primary, secondary, tertiary, and quaternary alkyl ammonium or alkylphosphonium cations having the following disadvantages: disintegrate at high temperature, catalyze polymer degradation, and make nanoproducts colorific, and so forth. In order to evaluate modifying effect of poly(ethylene oxide), modified clay products were characterize d by X‐ray spectrum. Then organoclay was used to prepare nanocomposite based on unsaturated polyester. Morphology and properties of nanocomposites were measure d by X‐ray diffraction, transmission electron microscopy, tensile strength, and thermal stability. The results showed that clay galleries changed to intercalated state in the nanocomposites. Properties of nanocomposites were improved a lot when the loading of the organoclay was used at 1 phr.