Synthesis and characterization of fillers of controlled structure based on polyhedral oligomeric silsesquioxane cages and their use in reinforcing siloxane elastomers

Pan, Guirong; Mark, J. E.; Schaefer, Dale W.

doi:10.1002/polb.10695

Cited by 125 publications

(85 citation statements)

References 16 publications

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“…The organic-inorganic hybrid polymers have been prepared by some effective methods (Mark et al, 1995;Mascia, 1995;Novak, 1993;Provatas et al, 1997;Laine et al, 1998;Vaia et al, 1996;Sogah et al, 1999;Saegusa et al, 1991;Landry st al., 1993;Yamada et al, 1997;Chujo et al, 2003;Laine et al, 2003;Galiastsatos et al, 2001). Hydrosilylation reaction of multi-functionalized crosslinking reagents containing Si-H or vinyl group is one of the effective methods to yield the organic-inorganic network polymers containing Si (Yoshida et al, 2004(Yoshida et al, , 2001Tsumura et al, 1998Tsumura et al, , 1999Michalczyk et al, 1993;Lercher et al, 2002;Laine et al, 1998;Schaefer et al, 2003). The authors recently attained effective synthesis of organic-inorganic hybrid gels by means of a hydrosilylation reaction of cyclic siloxane or cubic silsesquioxane with ,-nonconjugated dienes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

Naga¹,

Uchiyama²,

Takahashi³

et al. 2016

IJC

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Semi-interpenetrating polymer network (semi-IPN) gels have been synthesized using a hydrosilylation reaction of 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS) as a joint molecule, and ,-nonconjugated dienes, 1,5-hexadiene (HD) or 1,9-decadiene (DD) as linker molecules in the presence of polystyrene (PS) as a liner polymers in toluene or cyclohexane. Network structure, mesh size and mesh size distribution, of the resulting semi-IPN gels was quantitatively characterized by means of a scanning microscopic light scattering (SMILS). The relaxation peaks derived from three kinds of structures were detected in the semi-IPN gels prepared in toluene by the SMILS analysis. One was derived from the mesh formed by TMCTS/,-nonconjugated dienes about 1-2 nm. Others were derived from transition networks about 20-150 nm and large clustered liner polymer chains about 700-2300 nm. Effect of concentration and molecular weight of the liner polymer on the network structure of the semi-IPN gels in toluene was investigated. The relaxation peaks derived from transition networks or random coils formed by aggregated PS chains were detected in the semi-IPN gels containing high concentration or high molecular weight PS. The semi-IPN gels containing PS were also prepared in cyclohexane as a poor solvent for PS at 40º C, which was a higher temperature than the upper critical solution temperature (UCST = 34º C) of PS in cyclohexane. The network structure of the semi-IPN gels was traced by SMILS on the cooling process. In the semi-IPN gel with the short linker molecule of HD, the relaxation peak derived from clustered PS chains was detected over the UCST. By contrast, the relaxation peak derived from transition network was observed in the semi-IPN gel with the long linker molecule of DD.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

Naga¹,

Uchiyama²,

Takahashi³

et al. 2016

IJC

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“…Polymer nanocomposites have received considerable attention worldwide from research groups 1 because they offer an opportunity to modify the thermal, electrical, optical or mechanical properties of polymeric materials for use in a wide variety of practical applications. 2 Polymer nanocomposite materials based on the incorporation of polyhedral oligomeric silsesquioxane (POSS) are one of the composite materials that have drawn much interest.…”

Section: Introductionmentioning

confidence: 99%

“…7 The empirical formula of POSS is (RSiO3/2)n, where n is commonly 4, 6, 8, 10 or 12 for a completely condensed silsesquioxane, and R can be hydrogen, inert organic groups or reactive functional groups. 1,3,[7][8][9] An example structure of a completely 'condensed' POSS with n = 8 is shown in Figure 1. The substituent groups are used to improve solubility in solvents and to enhance miscibility with polymeric host materials.…”

Section: Introductionmentioning

confidence: 99%

“…1,2,17,18 Al-ternatively, nanocomposites prepared from polysilicate-based particles studied previously 19,20 also have an inner inorganic framework of silicon and oxygen and particle sizes ranging from 1-3 nm.…”

Section: Introductionmentioning

confidence: 99%

“…The substituent groups are used to improve solubility in solvents and to enhance miscibility with polymeric host materials. 1,8 The reactive functional groups permit the POSS cages to be a graftable and polymerisable nanoparticle. 4 The POSS materials are typically prepared by a process that involves crystallizing the target regular cage structured POSS molecules from solution.…”

Section: Introductionmentioning

confidence: 99%

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Impact of End-Tethered Polyhedral Nanoparticles on the Mobility of Poly(dimethylsiloxane)

et al. 2015

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A series of dumbbell-shaped nanocomposite materials of poly(dimethylsiloxanes) (PDMSs) and polyhedral oligomeric silsesquioxanes (POSSs) were synthesized through hydrosilylation reactions of allyl-and vinyl-POSS and hydrideterminated PDMS. The chemical structures of the dumbbellshaped materials, so-called POSS-PDMS-POSS triblocks, were characterized by 1 H NMR and FT-IR spectroscopy. The molecular weights of the triblock polymers were determined by gel permeation chromatography (GPC). Their size was analyzed by small-angle neutron scattering (SANS) and pulsed-field gradient stimulated echo (PFG STE) NMR experiments. The impact of POSS on the molecular mobility of the PDMS middle chain was observed by using 1 H spin−spin (T 2 ) relaxation NMR. In contrast to the PDMS melts, the triblocks showed an increase in mobility with increasing molecular weight over the range studied due to the reduced relative concentration of constraints imposed by the end-tethered nanoparticles. The triblock systems were used to compare the impact of tethered nanoparticles on the mobility of the linear component compared to the mobility of the polymer in conventional blended nanocomposites. The tethered nanoparticles were found to provide more reinforcement than physically dispersed particles especially at high molecular weights (low particle concentration). The physical blends showed an apparent percolation threshold behavior.

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Rheology and Processing of Polymer/ POSS Nanocomposites

Pielichowski

Majka

Raftopoulos

2016

Rheology and Processing of Polymer Nanocomposites

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Synthesis and characterization of fillers of controlled structure based on polyhedral oligomeric silsesquioxane cages and their use in reinforcing siloxane elastomers

Cited by 125 publications

References 16 publications

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

Impact of End-Tethered Polyhedral Nanoparticles on the Mobility of Poly(dimethylsiloxane)

Rheology and Processing of Polymer/ POSS Nanocomposites

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