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• W2079779108 abstract "Monolithic hierarchical fractal assemblies of silica nanoparticles are referred to as aerogels, and despite an impressive collection of attractive macroscopic properties, fragility has been the primary drawback to applications. In that regard, polymer-cross-linked silica aerogels have emerged as strong lightweight nanostructured alternatives rendering new applications unrelated to aerogels before, as in ballistic protection, possible. In polymer-cross-linked aerogels skeletal nanoparticles are connected covalently with a polymer. However, the exact location of the polymer on the elementary structure of silica and, therefore, critical issues, such as how much is enough, have remained ambiguous. To address those issues, the internal nanoporous surfaces of silica wet-gels were modified with norbornene (NB) by cogelation of tetramethyl orthosilicate (TMOS) with a newly synthesized derivative of nadic acid (Si-NAD: N-(3-triethoxysilylpropyl)-5-norbornene-2,3-dicarboximide). As inferred by both rheological and liquid 29Si NMR data, Si-NAD reacts more slowly than TMOS, yielding a TMOS-derived skeletal silica network surface-derivatized with NB via monomer-cluster aggregation. Then, ring-opening metathesis polymerization (ROMP) of free NB in the nanopores engages surface-bound NB moieties and bridges skeletal nanoparticles either through cross-metathesis or a newly described stitching mechanism. After solvent exchange and drying with supercritical fluid CO2 into aerogels (bulk densities in the range 0.27–0.63 g cm–3, versus 0.20 g cm–3 of the native network), the bridging nature of the polymer is inferred by a >10-fold increase in mechanical strength and a 4-fold increase in the energy absorption capability relative to the native samples. The cross-linking polymer was freed from silica by treatment with HF, and it was found by GPC that it consists of a long and a short component, with around 400 and 10 monomer units, respectively. No evidence (by SAXS) was found for the polymer coiling up into particles, consistent with the microscopic similarity (by SEM) of both native and cross-linked samples. Most importantly, the polymer does not need to spill over higher aggregates for greatly improved mechanical strength; mechanical properties begin improving after the polymer coats primary particles. Extremely robust materials are obtained when the polymer fills most of the fractal space within secondary particles." @default.
• W2079779108 created "2016-06-24" @default.
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• W2079779108 date "2012-08-23" @default.
• W2079779108 modified "2023-10-09" @default.
• W2079779108 title "Monolithic Hierarchical Fractal Assemblies of Silica Nanoparticles Cross-Linked with Polynorbornene via ROMP: A Structure–Property Correlation from Molecular to Bulk through Nano" @default.
• W2079779108 cites W1040089164 @default.
• W2079779108 cites W1040161955 @default.
• W2079779108 cites W1963485703 @default.
• W2079779108 cites W1967617739 @default.
• W2079779108 cites W1968079766 @default.
• W2079779108 cites W1970078569 @default.
• W2079779108 cites W1970728984 @default.
• W2079779108 cites W1975892814 @default.
• W2079779108 cites W1977125685 @default.
• W2079779108 cites W1979664959 @default.
• W2079779108 cites W1981556229 @default.
• W2079779108 cites W1981872421 @default.
• W2079779108 cites W1986372607 @default.
• W2079779108 cites W1986533208 @default.
• W2079779108 cites W1989275496 @default.
• W2079779108 cites W1992183960 @default.
• W2079779108 cites W1993896045 @default.
• W2079779108 cites W1994259446 @default.
• W2079779108 cites W1995490731 @default.
• W2079779108 cites W1996429030 @default.
• W2079779108 cites W1997118039 @default.
• W2079779108 cites W2001586956 @default.
• W2079779108 cites W2005650638 @default.
• W2079779108 cites W2007351527 @default.
• W2079779108 cites W2011652417 @default.
• W2079779108 cites W2011789564 @default.
• W2079779108 cites W2013277537 @default.
• W2079779108 cites W2020881063 @default.
• W2079779108 cites W2023387304 @default.
• W2079779108 cites W2027630847 @default.
• W2079779108 cites W2029734865 @default.
• W2079779108 cites W2035524534 @default.
• W2079779108 cites W2037255761 @default.
• W2079779108 cites W2040036433 @default.
• W2079779108 cites W2042079661 @default.
• W2079779108 cites W2051194659 @default.
• W2079779108 cites W2052848977 @default.
• W2079779108 cites W2052942755 @default.
• W2079779108 cites W2057036687 @default.
• W2079779108 cites W2058169530 @default.
• W2079779108 cites W2058803281 @default.
• W2079779108 cites W2063192186 @default.
• W2079779108 cites W2063371534 @default.
• W2079779108 cites W2064282254 @default.
• W2079779108 cites W2068202469 @default.
• W2079779108 cites W2070573826 @default.
• W2079779108 cites W2074874316 @default.
• W2079779108 cites W2077537974 @default.
• W2079779108 cites W2082397718 @default.
• W2079779108 cites W2082830524 @default.
• W2079779108 cites W2084904473 @default.
• W2079779108 cites W2085734342 @default.
• W2079779108 cites W2090796369 @default.
• W2079779108 cites W2093988152 @default.
• W2079779108 cites W2096794840 @default.
• W2079779108 cites W2097674624 @default.
• W2079779108 cites W2099113566 @default.
• W2079779108 cites W2103777704 @default.
• W2079779108 cites W2105418804 @default.
• W2079779108 cites W2120167381 @default.
• W2079779108 cites W2140551148 @default.
• W2079779108 cites W2151046161 @default.
• W2079779108 cites W2155614421 @default.
• W2079779108 cites W2157768297 @default.
• W2079779108 cites W2159286877 @default.
• W2079779108 cites W2171620142 @default.
• W2079779108 cites W2200621920 @default.
• W2079779108 cites W2327706318 @default.
• W2079779108 cites W2953343485 @default.
• W2079779108 cites W3022501149 @default.
• W2079779108 cites W4250830673 @default.
• W2079779108 doi "https://doi.org/10.1021/cm3017648" @default.
• W2079779108 hasPublicationYear "2012" @default.
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