POSS-Based Polymers

Lichtenhan, Joseph D.; Pielichowski, Krzysztof; Blanco, Ignazio

doi:10.3390/polym11101727

Cited by 45 publications

(28 citation statements)

References 18 publications

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“…THF and diethyl ether were distilled from sodium/benzophenone ketyl. Silsesquioxane substrates, i. e. 2 [(dimethylsiloxy)hepta(isobutyl)octasilsesquioxane], [13] 3 (monodecker silsesquioxane), [14] 4 (7,17-dimethyl-7,17-dihydro-1,3,5,9,11,13,15,1-octaphenylhexacyclo[9.13.1 1,9 .1 3,15 .1 5,13 .1 11,19 ] decasiloxane), [15] were prepared according to literature procedures. Dialkenylgermanes 1 a and 1 b were prepared from the respective dichlorogermanes and allyl-and vinylmagnesium Grignard reagents.…”

Section: Experimental Section General Informationmentioning

confidence: 99%

Dialkenylgermanes as Precursors of Silsesquioxane‐based Macromolecular Structures

Grzelak

Frąckowiak

Marciniec

2020

Chemistry An Asian Journal

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Herein we report a study of highly efficient platinum-catalyzed hydrosilylation of dialkenylgermanes with silsesquioxanes and spherosilicates. The use of divinyl-and diallylgermanes allowed the synthesis of new classes of compounds, i. e., dumbbell-type systems, silsesquioxanes with alkenyl pendant group, and oligomeric derivatives. The results are supported by detailed data from in situ FT-IR and NMR measurements, enabling precise monitoring of the reaction progress and determination of regioselectivity of the formed products.

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Section: Experimental Section General Informationmentioning

confidence: 99%

Dialkenylgermanes as Precursors of Silsesquioxane‐based Macromolecular Structures

Grzelak

Frąckowiak

Marciniec

2020

Chemistry An Asian Journal

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“…Polyhedral oligomeric silsesquioxanes (POSS) are nanostructures with the empirical formula of (RSiO 1.5 ) n , where R is a hydrogen atom or an organic group (alkyl, alkylene, acrylate, hydroxyl, or epoxide units) [ 35 , 36 , 37 ]. These chemicals are composed of a silicon and oxygen cage, which is externally completed by organic groups that are covalently bonded with the silicon atoms.…”

Section: Introductionmentioning

confidence: 99%

The Toxicological Testing and Thermal Decomposition of Drive and Transport Belts Made of Thermoplastic Multilayer Polymer Materials

et al. 2020

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The article presents the potential impact of flat drive and transport belts on people’s safety during a fire. The analysis distinguished belts made of classically used fabric–rubber composite materials reinforced with cord and currently used multilayer polymer composites. Moreover, the products’ multilayers during the thermal decomposition and combustion can be a source of emissions for unpredictable and toxic substances with different concentrations and compositions. In the evaluation of the compared belts, a testing methodology was used to determine the toxicometric indicators (WLC50SM) on the basis of which it was possible to determine the toxicity of thermal decomposition and combustion products in agreement with the standards in force in several countries of the EU and Russia. The analysis was carried out on the basis of the registration of emissions of chemical compounds during the thermal decomposition and combustion of polymer materials at three different temperatures. Moreover, the degradation kinetics of the polymeric belts by using the thermogravimetric (TGA) technique was evaluated. Test results have shown that products of thermal decomposition resulting from the neoprene (NE22), leder leder (LL2), thermoplastic connection (TC), and extra high top cower (XH) belts can be characterized as moderately toxic or toxic. Their toxicity significantly increases with the increasing temperature of thermal decomposition or combustion, especially above 450 °C. The results showed that the belts made of several layers of polyamide can be considered the least toxic in fire conditions. The TGA results showed that NBR/PA/PA/NBR belt made with two layers of polyamide and the acrylonitrile–butadiene rubber has the highest thermal stability in comparison to other belts.

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“…A potential solution is to incorporate inorganic constituents such as silica into the polymer backbone [ 25 , 26 , 27 , 28 , 29 ]. POSS is a cage-like silicon oxide-based molecule that contains various organic functional groups [ 30 , 31 ]. Depending on the functional groups, it can be mechanically dispersed in an organic matrix as a molecular filler, without covalent bonding, or it can be covalently linked to the matrix [ 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of POSS Type on the Shape Memory Properties of Epoxy-Based Nanocomposites

Bram

Gouzman²,

Bolker³

et al. 2020

Molecules

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Thermally activated shape memory polymers (SMPs) can memorize a temporary shape at low temperature and return to their permanent shape at higher temperature. These materials can be used for light and compact space deployment mechanisms. The control of transition temperature and thermomechanical properties of epoxy-based SMPs can be done using functionalized polyhedral oligomeric silsesquioxane (POSS) additives, which are also known to improve the durability to atomic oxygen in the space environment. In this study, the influence of varying amounts of two types of POSS added to epoxy-based SMPs on the shape memory effect (SME) were studied. The first type contained amine groups, whereas the second type contained epoxide groups. The curing conditions were defined using differential scanning calorimetry and glass transition temperature (Tg) measurements. Thermomechanical and SME properties were characterized using dynamic mechanical analysis. It was found that SMPs containing amine-based POSS show higher Tg, better shape fixity and faster recovery speed, while SMPs containing epoxide-based POSS have higher crosslinking density and show superior thermomechanical properties above Tg. This work demonstrates how the Tg and SME of SMPs can be controlled by the type and amount of POSS in an epoxy-based SMP nanocomposite for future space applications.

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POSS-Based Polymers

Abstract: The combination of functional polymers with inorganic nanostructured compounds has become a major area of research and technological development owing to the remarkable properties and multifunctionalities deriving from their nano and hybrid structures [...]

Cited by 45 publications

References 18 publications

Dialkenylgermanes as Precursors of Silsesquioxane‐based Macromolecular Structures

Dialkenylgermanes as Precursors of Silsesquioxane‐based Macromolecular Structures

The Toxicological Testing and Thermal Decomposition of Drive and Transport Belts Made of Thermoplastic Multilayer Polymer Materials

The Effect of POSS Type on the Shape Memory Properties of Epoxy-Based Nanocomposites

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