Synthesis and Dielectric Properties of Polyimide-Chain-End Tethered Polyhedral Oligomeric Silsesquioxane Nanocomposites

Leu, Chyi Ming; Reddy, G. Madhusudhan; Wei, Kung‐Hwa; Shu, Ching‐Fong

doi:10.1021/cm0208408

Cited by 189 publications

(142 citation statements)

References 32 publications

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“…Verker et al [30] and Zhao and Schiraldi [31] attributed similar behaviour to a disruption of the polymer molecular (chain) structure brought on by POSS concentrations above 5 wt%. Liu and Zheng [32] suggested this observation is caused by a decrease in material density, due to an increase in nanocomposite porosity [33,34]. Additionally, the crosslinking densities per unit volume can decrease with increasing POSS content, compromising the reinforcement mechanism as a consequence.…”

Section: Thermomechanical Analysis 351 Stress-strain Analysismentioning

confidence: 99%

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Spoljaric¹,

Shanks²

2012

Express Polym. Lett.

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Abstract. Nanocomposites consisting of poly(styrene-b-butadiene-b-styrene) (SBS) and polyhedral oligomeric silsesquioxanes (POSS) were prepared using a solvent dispersion method. POSS molecules were functionalised with two dichlorotriazine reactive dyes (CI Reactive Blue 4, CI Reactive Red 2) prior to compounding. Infrared spectroscopy confirmed functionalisation. Scanning electron microscopy revealed an increase in filler aggregation with concentration, with preferential phase selectivity. Ultraviolet spectroscopy and colourimetry confirmed colour uniformity and suggested that colour intensity could be controlled. Functionalised POSS improved thermal stability by imparting restrictions on SBS chain motions. Tensile stress-strain analysis revealed an increase in modulus with filler concentration, while creep deformation decreased and permanent strain increased with POSS content. Storage modulus, loss modulus and glass transition temperature increased with filler content due to effective SBS-POSS interaction. Nanocomposite properties were influenced by the phase the filler was dispersed throughout and the structure of the dye chromophore.

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Section: Thermomechanical Analysis 351 Stress-strain Analysismentioning

confidence: 99%

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Spoljaric¹,

Shanks²

2012

Express Polym. Lett.

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“…The decreased densities could be ascribed to an increase in the porosity of the nanocomposites. [21,22] The porosity of POSS-containing nanocomposites is composed of two portions. One portion comes from the external porosity as a result of the inclusion of POSS cages, which can be interpreted as the increase in free volume of the nanocomposites caused by the interactions of POSS cages and polymer segments.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

Polyurethane Networks Nanoreinforced by Polyhedral Oligomeric Silsesquioxane

Liu

Zheng

2005

Macromol. Rapid Commun.

225

155

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Summary: Octaaminophenyl polyhedral oligomeric silsesquioxane (OapPOSS) was used as a crosslinking agent together with 4,4′‐methylenebis‐(2‐chloroaniline) to prepare polyurethane networks containing POSS. Fourier transform infrared spectroscopy (FT‐IR), dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) were employed to characterize the POSS‐reinforced polyurethane. The POSS‐containing PU networks displayed enhanced glass transition temperatures (Tgs) and the storage moduli of the networks of the glassy state and rubber plateaus were also observed to be significantly higher than that of the control polyurethane although only a small amount of POSS was incorporated into the systems. The results can be ascribed to the significant nanoscale reinforcement effect of POSS cages on the polyurethane matrix. TGA results showed the thermal stability was also improved with incorporation of POSS into the system.Dynamic mechanical spectra of PU and PU nanocomposites containing POSS.imageDynamic mechanical spectra of PU and PU nanocomposites containing POSS.

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“…In recent 20 years, researches on POSS reinforced resin matrix composites were rising, but most of them used experimental methods [7][8][9][10][11][12][13] , less with theoretical study. Until now, no available and practical theory design models and methods could be applied in engineering.…”

Section: Introductionmentioning

confidence: 99%

Design on Mechanical Reinforcement of POSS Reinforced Polymer Composites

Wang¹,

Liu²,

Chen³

et al. 2017

dtetr

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Abstract. POSS as a new kind of nanofiller which is organic-inorganic composite with nano-size and cage-like structure was added into polymer could to some extent improve materials' anti-high-temperature, anti-corrosion, surface hardness and other mechanical properties, had aroused great attentions of scientists workers. Reviews on the investigations that had been made on mechanism for mechanical reinforcement of Polyhedral oligomeric silsesquioxanes (POSS) reinforced polymer composites were presented. Several methods publicly published for predicted modulus of composites reinforced POSS up to now were also analyzed. Finally, the future research trends were outlined.

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Synthesis and Dielectric Properties of Polyimide-Chain-End Tethered Polyhedral Oligomeric Silsesquioxane Nanocomposites

Cited by 189 publications

References 32 publications

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Polyurethane Networks Nanoreinforced by Polyhedral Oligomeric Silsesquioxane

Design on Mechanical Reinforcement of POSS Reinforced Polymer Composites

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