Hybrid Organic−Inorganic Thermoplastics:  Styryl-Based Polyhedral Oligomeric Silsesquioxane Polymers

Haddad, Timothy S.; Lichtenhan, Joseph D.

doi:10.1021/ma960609d

Cited by 487 publications

(359 citation statements)

References 11 publications

Supporting

Mentioning

346

Contrasting

Unclassified

Order By: Relevance

“…Uniformly, it is observed that the glass-transition temperature of the base resin is efficiently enhanced upon copolymerization with the associated POSS monomer. [1][2][3]6 Additionally, we have reported on the modification of rheological properties of styryl-POSS copolymers, showing evidence for retardation of chain motion and group interaction effects. 7 Of current interest, including the present work, is the determination of POSS modification of such solid-state properties as mechanical relaxation, fracture behavior, and abrasion resistance.…”

Section: Introductionmentioning

confidence: 91%

Mechanical Relaxation and Microstructure of Poly(norbornyl-POSS) Copolymers

Mather¹,

Jeon²,

Romo-Uribe³

et al. 1999

Macromolecules

Self Cite

390

277

View full text Add to dashboard Cite

The mechanical relaxation behavior and microstructure of a series of novel norbornyl-POSS organic-inorganic copolymers have been investigated. We have examined the influence on physical properties of both the weight fraction of POSS-norbornyl monomer and the corner group composition. POSS refers to the polyhedral oligomeric silsesquioxane inorganic/organic macromer, which is composed of an inorganic Si 8O12 spherical core surrounded by seven inert organic corner groups and one reactive norbornyl moiety. It was observed that POSS copolymerization enhances the R-relaxation temperature, TR, in proportion to the weight fraction of the POSS-norbornyl comonomer. Interestingly, however, the magnitude of this dependence is larger for the POSS-norbornyl comonomer possessing cyclohexyl corner groups (CyPOSS) than for the copolymer with cyclopentyl corner groups (CpPOSS). Although POSS copolymerization yields only slight enhancement of the room temperature storage modulus, at temperatures lower than a strong mechanical relaxation, identified as a -relaxation, and near T ) -

show abstract

Section: Introductionmentioning

confidence: 91%

Mechanical Relaxation and Microstructure of Poly(norbornyl-POSS) Copolymers

Mather¹,

Jeon²,

Romo-Uribe³

et al. 1999

Macromolecules

Self Cite

390

277

View full text Add to dashboard Cite

show abstract

“…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%

Self-Assembly of Methacrylic Nanostructured Copolymers Containing Polyhedral Oligomeric Silsesquioxanes

et al. 2007

View full text Add to dashboard Cite

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.

show abstract

“…There are few attempts to improve the physical properties by the introduction of polyhedral oligomeric silsesquioxane (POSS) unit in main chain of polysiloxane in place of the bulky and rigid organic moieties [12][13][14]. Moreover, incorporation of POSS unit in backbone of the linear step-condensed polymer in definite structure was quite difficult as the polycondensation of POSS having multiple reactive sites of equivalent reactivity with di-functional monomers typically generates insoluble cross-linked products [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polysilsesquioxanes with Double-Decker Silsesquioxane Repeating Units

Hoque¹,

Kawakami²

2016

J. Sci. Res.

View full text Add to dashboard Cite

Polysilsesquioxanes were synthesized with end functional double-decker silsesquioxanes (DDSQ) and the polymers were characterized with 1 H NMR, 29 Si NMR and size exclusion chromatography (SEC). Polysilsesquioxane containing iso-butyl end capped DDSQ showed better solubility compared to that of methyl end capped DDSQ. Thermal properties investigated with TGA showed that the polymers exhibited exceptionally high stabilities in the range of 470-530°C even in both nitrogen and air atmosphere. The average residual weights of the polymers at 760°C were around 80% in the nitrogen atmosphere.

show abstract

Hybrid Organic−Inorganic Thermoplastics: Styryl-Based Polyhedral Oligomeric Silsesquioxane Polymers

Cited by 487 publications

References 11 publications

Mechanical Relaxation and Microstructure of Poly(norbornyl-POSS) Copolymers

Mechanical Relaxation and Microstructure of Poly(norbornyl-POSS) Copolymers

Self-Assembly of Methacrylic Nanostructured Copolymers Containing Polyhedral Oligomeric Silsesquioxanes

Synthesis of Polysilsesquioxanes with Double-Decker Silsesquioxane Repeating Units

Contact Info

Product

Resources

About