Facile synthesis of hydrophobic fluoroalkyl functionalized silsesquioxane nanostructures

Iacono, Scott T.; Vij, Ashwani; Grabow, Wade W.; Smith, Dennis W.; Mabry, Joseph M.

doi:10.1039/b712976a

Cited by 79 publications

(68 citation statements)

References 36 publications

(12 reference statements)

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“…These findings are consistent with previously reported studies showing increased surface hydrophobicity for other POSS/polymer systems and POSS molecules with fluorinated alkyl chains attached to the POSS cage. 12,[21][22][23][24] Surface dynamics were further studied via dynamic water contact angle analysis. The advancing (h a ) and receding (h r ) water contact angles were measured and their difference, the contact angle hysteresis (h h ), was calculated (Table 4).…”

Section: Resultsmentioning

confidence: 99%

“…6,18 Recently, studies on surface properties of POSS HPNC's have appeared in the literature, and these are focused mainly on the surface hydrophobicity of POSS based copolymers, 21,22 fluorinated POSS, 23 and fluorinated POSS/ fluorinated polymer composites. 24 All of these studies report increased hydrophobicity on incorporation of POSS nanoparticles. Takahara and coworkers 25 evaluated surface dewetting characteristics of polystyrene-POSS hybrid films prepared via solution dispersion of POSS and PS in a common solvent.…”

Section: Introductionmentioning

confidence: 99%

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Surface energetics, dispersion, and nanotribomechanical behavior of POSS/PP hybrid nanocomposites

Misra¹,

Fu²,

Morgan³

2007

J Polym Sci B Polym Phys

107

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Hybrid organic-inorganic polymer nanocomposites incorporating polyhedral oligomeric silsesquioxane (POSS) nanoparticles are of increasing interest for high performance materials applications. Octaisobutyl POSS/polypropylene nanocomposites were prepared at varying POSS concentrations via melt blending. The interplay of POSS molecular geometry, composition, and concentration in relation to the tribological, nanomechanical, surface energy, and bulk properties of the nanocomposites were investigated. Ultra-low friction and enhanced hardness, modulus, and hydrophobicity were observed for the nanocomposite surfaces, with minimal changes in the bulk thermomechanical properties. Parallel AFM, SEM, TEM, and spectroscopic analyses demonstrated significant differences in POSS distribution and aggregation in the surface and the bulk, with preferential segregation of POSS to the surface. Additionally, contact angle studies reveal significant reduction in surface energy and increase in hysteresis with incorporation of POSS nanoparticles. The differences in bulk and surface properties are largely explained by the gradient concentration of POSS in the polymer matrix, driven by POSS/POSS and POSS/polymer interactions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface energetics, dispersion, and nanotribomechanical behavior of POSS/PP hybrid nanocomposites

Misra¹,

Fu²,

Morgan³

2007

J Polym Sci B Polym Phys

107

View full text Add to dashboard Cite

show abstract

“…Among them, the polyhedral oligomeric silsesquioxane (POSS) compounds, which have a functionalized silicon oxygen core, can act as robust nanometer sized building blocks for the preparation of new materials. [18][19][20][21] More recently, it was reported that layered structures in silsesquioxanes containing charged pendant organic groups can be prepared using aminopropyltrimethoxysilane as precursor reagent, in very acid medium. 22,23 The resulting product is a water soluble and viscous liquid of difficult handling.…”

Section: Introductionmentioning

confidence: 99%

An innovative series of layered nanostructured aminoalkylsilica hybrid material

Trindade

Stoll

Pereira

et al. 2009

J. Braz. Chem. Soc.

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Uma nova série de amostras de material híbrido à base de sílica, contendo o grupo catiônico amoniopropil ligado na forma pendente, foi obtida usando-se o método sol-gel de síntese, variandose a razão molar entre o precursor inorgânico e o precursor orgânico. A análise termogravimétrica mostrou que as amostras são termicamente estáveis até 260 °C. Os resultados obtidos por difratometria de raios X, microscopia eletrônica de transmissão, ressonância magnética nuclear de 29 Si e análise elementar são compatíveis com o modelo estrutural de camadas de silsesquioxano com distâncias basais de até 5,4 nm, contendo sílica amorfa no espaço entre as camadas.An innovative series of silica-based hybrid materials containing pendant cationic ammoniumpropyl groups was obtained using the sol-gel method, by varying the molar ratio of the inorganic and organic precursors. Thermogravimetric analysis showed that samples were thermally stable up to 260 °C. Results obtained by X-ray diffractometry, transmission electron microscopy, 29 Si nuclear magnetic resonance and elemental analysis were compatible with a silsesquioxane layered structural model showing basal distances up to 5.4 nm, containing amorphous silica in the interlayer space. Keywords: nanostructured materials, layered hybrid materials, silsesquioxanes IntroductionThe development of organic-inorganic silica-based hybrid materials has received growing attention in the last decades. These materials present characteristics of the individual components as well as new unexpected properties.1-6 A satisfactory method to obtain these hybrid materials is the sol-gel synthesis, which allows dispersion of the components in nano or molecular scale, combining their physicochemical properties or producing new ones. Among this ensemble, the self-organized silica-based hybrid materials are very promising, because a great quantity of novel materials with attractive properties can be obtained. [7][8][9][10][11][12] They can be prepared using proper organosilane precursors presenting two or more polycondensation points, which are gelified together with an inorganic alkylorthosilicate precursor. The self-organization of these hybrid materials is imposed by the rigidity of the organic groups chemically bonded in a bridged way to the inorganic moiety. [11][12][13][14][15] In recent times it was demonstrated that self-organized materials can also be obtained using bridging charged organic groups. 16,17 It is important to point out that the selforganization in silica-based hybrid material has always been associated with the presence of bridging organic groups. Up to the present time, as far as we know, the synthesis of self-organized silica-based hybrid materials containing pendant organic groups has not been reported.Another kind of hybrid materials can be obtained by gelation of organosilanes without addition of alkylorthosilicate inorganic precursors. These materials, called silsesquioxanes, have elevated organic content and can also present self-organization properties. Among them, the polyhe...

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“…On the other hand, as a blowing agent, ADP releases inert gases to dilute the oxygen concentration in the air. Moreover, ADP is able to catalyze the hydrolysiscondensation of MTMS to form a Si-O-Si network structure with a low surface energy [29,[34][35][36][37][38][39], as shown in Scheme 1. According to the previous research [40], amine salts can interact with clays, causing clay nanoplatelets to deposit in stacks rather than as individual sheets.…”

Section: Resultsmentioning

confidence: 99%

Flame retardant and hydrophobic cotton fabrics from intumescent coatings

Zhang

Williams

Becher

et al. 2017

Adv Compos Hybrid Mater

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Intumescent flame retardant and hydrophobic coatings, consisting of sodium montmorillonite (MMT), am moniu m d ihy dro gen ph os pha te ( ADP), an d methyltrimethoxysilane (MTMS), were prepared via in situ sol-gel and self-assembly techniques to acquire multifunctional cotton fabrics. The impact of MTMS concentration on hydrophobicity, fire resistance, thermal stability, and heat release behavior of the coated fabrics was investigated. A Si-O-Si network structure was generated via the hydrolysis-condensation reaction of MTMS, induced by the catalysis of ADP. After treated by the coating with 2.0 wt.% of MTMS, the cotton fabric with a total uptake of 22.7 wt.% achieved appreciable flame retardancy and hydrophobicity, as well as satisfactory thermal stability and heat release behaviors. Overall, this research provides a facile and effective approach to prepare flame retardant and hydrophobic cotton fabrics.

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Facile synthesis of hydrophobic fluoroalkyl functionalized silsesquioxane nanostructures

Abstract: New fluorinated polyhedral oligomeric silsesquioxane (F-POSS) structures possessing a high degree of hydrophobicity have been prepared via a facile corner-capping methodology.

Cited by 79 publications

References 36 publications

Surface energetics, dispersion, and nanotribomechanical behavior of POSS/PP hybrid nanocomposites

Surface energetics, dispersion, and nanotribomechanical behavior of POSS/PP hybrid nanocomposites

An innovative series of layered nanostructured aminoalkylsilica hybrid material

Flame retardant and hydrophobic cotton fabrics from intumescent coatings

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