Linear Hybrid Polymer Building Blocks: Methacrylate-Functionalized Polyhedral Oligomeric Silsesquioxane Monomers and Polymers

Lichtenhan, Joseph D.; Otonari, Yoshiko A.; Carr, Michael J.

doi:10.1021/ma00128a067

Cited by 463 publications

(343 citation statements)

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“…These hybrids are characterized by two amorphous halos centered at 2θ = 7.2° and 18.8°, with minor differences with respect to poly(butyl methacrylate) homopolymer. In this case the random copolymerization process prevents crystallization of the dispersed silsesquioxane cages, like reported for other methacrylic hybrid copolymers [8]. Figure 6 shows the XRD patterns of methacrylcyclohexyl POSS in comparison to powders made of BU-POSS copolymers with a high content of silsesquioxane.…”

Section: Tabsupporting

confidence: 63%

“…However equation 12 leads to an extrapolated T g value of about 390-400 K, while it is known that poly-POSS homopolymers generally decompose before softening at T > +673 K [8,23]. One possible explanation of this is the fact that such hybrid copolymers, or at least those at higher nanofiller content, are not truly monophasic as also suggested by XRD analysis.…”

Section: Fig 5 X-ray Diffraction Profiles Of Bu-poss Copolymer Filmmentioning

confidence: 94%

“…POSS are molecular nanoparticles consisting of a cubic Si 8 O 12 cage of nanometric size, bearing at its corners eight organic groups. The choice of such groups can affect both solubility as well as chemical reactivity.…”

Section: Introductionmentioning

confidence: 99%

“…How this morphology changes or is retained in POSS containing hybrids is dependent on the affinity between the host polymer and POSS substituents. For example, it has been reported that introduction of POSS in an inherently amorphous architecture, like a methacrylic random copolymer, completely suppresses its crystallization behaviour [8]. By contrast, in other cases, ordered, self-assembled hybrid structures were found in polystyrene [9], polynorbornene [10], polyurethanes [11], polybutadiene [12] and even when host matrices were crystallizable like in case of polyethylene [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Among the various compositions, acrylic and methacrylic copolymers have been described and obtained by free radical [8] and atom transfer radical polymerization processes [15]. Some applications were also envisaged as resist materials [16].…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of Methacrylic Nanostructured Copolymers Containing Polyhedral Oligomeric Silsesquioxanes

et al. 2007

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Two hybrid copolymer series obtained by free-radical copolymerization of methacrylcyclohexyl Polyhedral oligomeric silsesquioxane (POSS) with butyl methacrylate or 2-ethylhexylmethacrylate were characterized by 1 H-NMR spectroscopy, gel permeation chromatography (GPC), X-rays Diffraction (XRD), differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA). Reactivity ratios were calculated by low yield composition data suggesting the formation of random copolymers with low probability of poly-POSS sequences. XRD studies showed the crystallization behaviour of the inorganic phase independently on the POSS content; however sample processing by solvent casting effectively hindered the copolymer self-assembling ability. DSC suggests the formation of polyphasic structures with T g increasing with POSS content, and with endothermal peaks occurring at higher temperature. Finally TGA shows an improved thermal stability of hybrid copolymers with char yield correlated to the level of inorganic phase.

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Section: Tabsupporting

confidence: 63%

Section: Fig 5 X-ray Diffraction Profiles Of Bu-poss Copolymer Filmmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of Methacrylic Nanostructured Copolymers Containing Polyhedral Oligomeric Silsesquioxanes

et al. 2007

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Thermal and viscoelastic property of epoxy-clay and hybrid inorganic-organic epoxy nanocomposites

Lee

Lichtenhan

1999

J. Appl. Polym. Sci.

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205

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ABSTRACT:The properties of nanostructured plastics are determined by complex relationships between the type and size of the nanoreinforcement, the interface and chemical interaction between the nanoreinforcement and the polymeric chain, along with macroscopic processing and microstructural effects. In this article, we investigated the thermal and viscoelastic property enhancement on crosslinked epoxy using two types of nanoreinforcement, namely, organoion exchange clay and polymerizable polyhedral oligomeric silsesquioxane (POSS) macromers. Glass transitions of these nanocomposites were studied using differential scanning calorimetry (DSC). Small-strain stress relaxation under uniaxial deformation was examined to provide insights into the time-dependent viscoelastic behavior of these nanocomposites. Since the size of the POSS macromer is comparable to the distance between molecular junctions, as we increase the amount of POSS macromers, the glass transition temperature T g as observed by DSC, increases. However, for an epoxy network reinforced with clay, we did not observe any effect on the T g due to the presence of clay reinforcements. In smallstrain stress relaxation experiments, both types of reinforcement provided some enhancement in creep resistance, namely, the characteristic relaxation time, as determined using a stretched exponential relaxation function increased with the addition of reinforcements. However, due to different reinforcement mechanisms, enhancement in the instantaneous modulus was observed for clay-reinforced epoxies, while the instantaneous modulus was not effected in POSS-epoxy nanocomposites.

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Polyhedral oligomeric silsesquioxane(POSS)-based polymers

Schwab¹,

Lichtenhan

1998

Appl. Organometal. Chem.

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379

270

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A diverse and entirely new class of monomer and polymer technology based on polyhedral oligomeric silsesquioxane (POSS) reagents has been developed. POSS reagents are unique in that they are physically large (approx. 15 Å diameter and 1000 amu) and are composed of a robust silicon-oxygen framework that can be easily functionalized with a variety of organic substituents. Appropriate functionalization of POSS cages allows for their incorporation into traditional thermoplastic resins without modification of existing manufacturing processes. The incorporation of POSS segments into linear copolymer systems results in increased glass transition and decomposition temperatures, increased oxygen permeability and reduced flammability and heat evolution, as well as modified mechanical properties relative to conventional organic systems.

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Linear Hybrid Polymer Building Blocks: Methacrylate-Functionalized Polyhedral Oligomeric Silsesquioxane Monomers and Polymers

Cited by 463 publications

References 0 publications

Self-Assembly of Methacrylic Nanostructured Copolymers Containing Polyhedral Oligomeric Silsesquioxanes

Self-Assembly of Methacrylic Nanostructured Copolymers Containing Polyhedral Oligomeric Silsesquioxanes

Thermal and viscoelastic property of epoxy-clay and hybrid inorganic-organic epoxy nanocomposites

Polyhedral oligomeric silsesquioxane(POSS)-based polymers

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