Supramolekulare Kontrolle der mechanischen Eigenschaften feuerabschirmender biomimetischer Perlmuttanaloga

Walther, Andreas; Bjurhager, Ingela; Malho, Jani–Markus; Ruokolainen, Janne; Berglund, Lars A.; Ikkala, Olli

doi:10.1002/ange.201001577

Cited by 23 publications

(12 citation statements)

References 37 publications

(65 reference statements)

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“…Using a similar technique, greatly improved modulus and strength was reported for MTM-PVA (polyvinylalcohol) composites where the MTM-polymer interaction is strong [8]. In other studies [9,10], a much simpler preparation route was used which was inspired by papermaking filtration procedures. A hydrocolloidal dispersion of exfoliated silicate platelets was mixed with a water-soluble polymer solution.…”

Section: Introductionmentioning

confidence: 91%

“…Addition of chitosan reduces filtration time and modifies mechanical properties [13]. The polymer adsorption method developed for true nanostructural control [9,10], was also used to prepare MTM/chitosan bionanocomposite films [14]. The hybrid films prepared by first adsorbing chitosan show improved optical transparency and mechanical properties compared with hybrid films prepared by directly mixing MTM and chitosan (without separate adsorption step).…”

Section: Introductionmentioning

confidence: 99%

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Fire-retardant and ductile clay nanopaper biocomposites based on montmorrilonite in matrix of cellulose nanofibers and carboxymethyl cellulose

Liu

Berglund

2013

European Polymer Journal

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Fire-retardant and ductile clay nanopaper biocomposites based on montmorrilonite in matrix of cellulose nanofibers and carboxymethyl cellulose

Liu

Berglund

2013

European Polymer Journal

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“…HPAMAM-clay layered hybrid films were prepared in a simple vacuum-aided filtration process ( Figure 1). [15] Firstly, HPAMAM aqueous solution was mixed with an aqueous suspension of exfoliated clay nanosheets. The resulting mixture was stirred for 24 hours to allow HPAMAM molecules to fully adsorb onto the surface of the clay nanosheets.…”

mentioning

confidence: 94%

Nacrelike Nanocomposite Films from Fluorescent Hyperbranched Poly(amido amine)s and Clay Nanosheets

et al. 2013

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Inspired by the hierarchical structure of nacre, lots of functional nanocomposite films have been fabricated through finely tuning the composition and structure. To broaden their application in biological and biomedical research, it is highly demanded to develop a new strategy to fabricate nanocomposite films that are both biocompatible and functional. Herein, hyperbranched poly(amido amine)s (HPAMAMs) have been assembled with clay nanosheets. The obtained nanocomposite films show good mechanical performance and fluorescence properties. Analysis of the structure of the nanocomposite films indicates that the HPAMAMs and the clay nanosheets are stacked together in an orderly manner. The clay nanosheets align in the direction parallel to the film surface. Because of the inherent biocompatibility and autofluorescence property of the HPAMAMs, such composite films are thought to be very promising in applications requiring biocompatibility, fluorescence, and good mechanical performance. The method should provide a new route to the fabrication of functional nacrelike composite materials.[a] Prof.

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“…1a) consisting of 2, 4, 6, 8 or 10 acetylated glucosamine units corresponding to a DA of 20%, 40%, 60%, 80% and 100%, respectively. The Mnt clay model was a sodium smectite was built based on the structure of pyrophyllite by Cygan et al 27 In the present study, the Mnt model was built from combining 8 super-cells in the x-direction, and 5 in the y-direction, with the chemical formula of each 16 (Fig. Only the polymer charges were varied at the different pH.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…This is possibly related to its highly acetylated structure. 13 Tang et al 14 pioneered the eld of nacre-mimetic composites with a layer-by-layer deposition technique using clay and a water-soluble polymer, and Walther et al 15,16 provided the next large step forward by utilizing the self-assembly properties of the two phases in a process similar to paper making, thereby permitting a continuous water-based processing. The gain in solubility is an effect of alkaline deacetylation of CHT, and the protonation of the amino groups in the acidic condition (pH < 6.5).…”

Section: Introductionmentioning

confidence: 99%

Molecular mechanisms for the adhesion of chitin and chitosan to montmorillonite clay

Wang

Wohlert

Bergenstråhle-Wohlert

et al. 2015

RSC Adv.

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Molecular dynamics simulations have been performed to investigate molecular adhesion of chitin and chitosan oligomers to montmorillonite (Mnt) clay at different degrees of acetylation (DA, 0%, 20%, 40%, 60%, 80% and 100%) and different degree of protonation (DPr, 0%, 50%, 100% mimicking pH > 6.5, pH ¼ 6.5, pH < 4, respectively) under fully hydrated conditions. Although the Mnt surface is negatively charged and a variation in DA also implies going from a positively charged oligomer at DA ¼ 0% to a neutral oligomer at DA ¼ 100%, the simulations show unexpectedly small variation of the total molecular adhesion as a function of DA. From our analysis we propose that this quantitatively similar adhesion arises from two different mechanisms. At low DA, the oligomer is rich in positively charged amino groups interacting strongly with the negatively charged surface by direct electrostatic interaction. On the other hand, at high DA, electrically neutral acetyl groups are strongly correlated with the Na + counter ions, which are in all cases stuck at the surface and the counter ions seem to act as 'glue' between the acetyl groups and the Mnt. However, when protonation was decreased, adhesion was affected and significantly lowered at neutral conditions (DPr ¼ 0%). The reason is concluded to be differences in charge distributions of the respective functional groups. A further investigation on the intramolecular hydrogen bonds formed in CHT or CHS shows that the adsorbed conformation of the polymer is also highly affected by DA. This work provides fundamental insights into adhesion mechanisms and is of potential importance for the development of polymer-clay based composite materials. † Electronic supplementary information (ESI) available: Details of the parameterization of protonated and deprotonated glucosamine; charge distributions of atoms in glucosamine, protonated glucosamine and acetylated glucosamine units; density proles of the different functional group atoms for all studied CHS or CHT combined Mnt clay systems; radial distribution functions between the functional group atoms and counter ions for all the simulated systems; interaction energies between polymer and clay, and between polymer and water; and water orientations around the hydroxyl O3 atom of the CHS and CHT chains in solution. See

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Supramolekulare Kontrolle der mechanischen Eigenschaften feuerabschirmender biomimetischer Perlmuttanaloga

Cited by 23 publications

References 37 publications

Fire-retardant and ductile clay nanopaper biocomposites based on montmorrilonite in matrix of cellulose nanofibers and carboxymethyl cellulose

Fire-retardant and ductile clay nanopaper biocomposites based on montmorrilonite in matrix of cellulose nanofibers and carboxymethyl cellulose

Nacrelike Nanocomposite Films from Fluorescent Hyperbranched Poly(amido amine)s and Clay Nanosheets

Molecular mechanisms for the adhesion of chitin and chitosan to montmorillonite clay

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