Dendrimers and hyper-branched polymers interacting with clays: fruitful associations for functional materials

Caminade, Anne‐Marie; Beraa, Abdellah; Laurent, Régis; Delavaux‐Nicot, Béatrice; Hajjaji, M.

doi:10.1039/c9ta05718h

Cited by 30 publications

(14 citation statements)

References 146 publications

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“…An increase to 36 wt % was noticed for CS-DG 2 -10%- f , and an impressive 45 wt % residue was even harvested in the case of CS-DG 2 -25%- f . Because of the improvement seen for DG 0 up to 617 °C and the even better properties achieved using DG 2 and DG 3 , we can tentatively attribute this stability to the robustness of the cyclotriphosphazene core that could act as a flame retardant during thermal treatment − as well as to the heteroatom functionalities located on the branching position. − DSC reveals that the first endothermic peak related to water evaporation was shifted in reticular chitosan. While routinely observed at 80 °C, this appears at 106 °C, meaning that water evaporation was delayed by an impressive Δ T of ∼26 °C (Figure S12).…”

Section: Resultsmentioning

confidence: 95%

Expanding Chitosan Reticular Chemistry Using Multifunctional and Thermally Stable Phosphorus-Containing Dendrimers

et al. 2023

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Chitosan is an astonishing building block that is extracted from marine crustacean waste, features randomly distributed amino and acetamido groups in its backbone, and can be handled in different forms, giving rise to an impressive diversity of functional nanomaterials. Hitherto, its reticular chemistry, although mandatory to circumvent its main drawback of instability, has been dominated by the use of glutaraldehyde. Unfortunately, the toxicity and inherent chemistry of the latter narrow further development of such cross-linked materials and constitute an impediment for their massive spreading and real implementation, especially in nanomedicine and related healthcare applications. Prompted by the well-established advantages of dendrimers, more distinctively those containing phosphorus in their skeleton, we herein explore the use of second-and third-generation phosphoruscontaining dendrimers as cross-linkers to provide an extended covalent dendritic framework grown inside of the carbohydrate network. The presence of residual amine and aldehyde defects was explored to conjugate other chemicals (viologen-based ionic liquid and aminopropyltriethoxysilane) thereby adding more functional diversity to the assembled framework. We also leveraged on the film-forming ability of chitosan to shape the reticular network as flexible films. Despite the bulkiness of the used phosphorus dendrimers, the film-forming memory of chitosan was preserved, allowing successful preparation of highly functional, transparent, and flexible micrometer-thick bioplastics. The cross-linking seems to delay the half-weight degradation temperature of the plastics, with a significant increase in the char residue and a reduced heat release rate. Ternary objects (Congo red dye and gold nanoparticles) could also be entrapped within the transparent films without leaching or degradation, thereby expanding the usefulness of these transparent coatings as multifunctional sensors, flame retardants, biofoulants, etc.

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Section: Resultsmentioning

confidence: 95%

Expanding Chitosan Reticular Chemistry Using Multifunctional and Thermally Stable Phosphorus-Containing Dendrimers

et al. 2023

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“…134 The cation exchange capacity (cmol kg −1 ), specific surface area (m 2 g −1 ), and basal interlayer spacing are higher for montmorillonite compared with illite-, kaolinite-, and muscovite-type layered silicates. 44,135 Another prominent member of the smectite group is trioctahedral smectite, known as LAPONITE® nanoclay (Fig. 4b).…”

Section: Structure and Propertiesmentioning

confidence: 99%

“…8,9 Their relative abundance and cost-effectiveness have been extensively exploited by their use in batteries, [10][11][12][13] supercapacitors, [14][15][16][17][18] flexible electronics, 19 dye discoloration, 17,20 biomedical applications, 21,22 drug delivery and bio-imaging, 23 oil adsorbers, 17,24 catalysis, 17,[25][26][27][28] agriculture, 17 bio-based flame retardants, 29 electrochemical nanosensors, 30,31 energy storage and conversion devices, 32 orthopedic biomaterials, 33 bioremediation, [34][35][36] and synthetic endeavors, 27 especially under solvent-free conditions. [37][38][39][40] Recent advances in assorted nanostructures with intriguing properties have illustrated that nanotechnologies may help optimize the properties of various materials, [41][42][43][44] including clay-based materials. 6,45,46 Nanoclays are naturally occurring ...…”

Section: Introductionmentioning

confidence: 99%

Sustainable and safer nanoclay composites for multifaceted applications

Padil

Murugesan

et al. 2022

Green Chem.

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“…An investigation into an intercalated to exfoliated morphology was carried out, in which there was the incorporation of clay modified with dilauryldimethyl ammonium bromide and 4,4 -diaminodiphenylmethane, respectively [58]. Intercalated structures were mainly observed when the clay was used as a pseudo chain extender [59]. However, the prevalence was as follows: firstly, intercalated morphology with nontethered clay (clay that was mixed physically), and secondly, exfoliated morphology with the tethered clay (clay that had the active functional group)-where both were for nanocomposite prepared by in-situ preparation technique [60].…”

Section: Morphology Properties Of Nanofiller-tpu Nanocompositesmentioning

confidence: 99%

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

et al. 2021

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The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU–polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU–clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg’s) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU–CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10-1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.

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Dendrimers and hyper-branched polymers interacting with clays: fruitful associations for functional materials

Abstract: The interaction of dendrimers or hyper-branched polymers with clays produces different types of new materials.

Cited by 30 publications

References 146 publications

Expanding Chitosan Reticular Chemistry Using Multifunctional and Thermally Stable Phosphorus-Containing Dendrimers

Expanding Chitosan Reticular Chemistry Using Multifunctional and Thermally Stable Phosphorus-Containing Dendrimers

Sustainable and safer nanoclay composites for multifaceted applications

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

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