Nanoscale reinforcement of polyhedral oligomeric silsesquioxane (POSS) in polyurethane elastomer

Fu, Bruce X.; Hsiao, Benjamin S.; White, Henry; Rafailovich, Miriam; Mather, Patrick T.; Jeon, Hong G.; Phillips, Shawn H.; Lichtenhan, Joseph D.; Schwab, Joseph J.

doi:10.1002/(sici)1097-0126(200005)49:5<437::aid-pi239>3.0.co;2-1

Cited by 186 publications

(110 citation statements)

References 16 publications

(19 reference statements)

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“…[4][5][6] Among them, POSS-modified elastomeric polyurethanes were also considered. [7][8][9][10] In this communication we report on the preparation and surface behavior of a new class of POSS-modified ionomeric polyurethanes with the aim to investigate the effect of nanostructure formation on the surface wettability of films applied from aqueous environment.…”

Section: Introductionmentioning

confidence: 99%

Wettability of Polyhedral Oligomeric Silsesquioxane Nanostructured Polymer Surfaces

Turri

Levi

2005

Macromol. Rapid Commun.

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Summary: Some model structures of waterborne polyurethane anionomers containing various amounts (ca. 3–20%) of a diol functionalized polyhedral oligomeric silsesquioxane (POSS) nanofiller were prepared. X‐ray diffraction showed the formation of a nanocrystalline structure in all copolymers considered. Static contact angle measurements indicated a significant enhancement of surface hydrophobicity as well as reduction in surface tension components even at the least POSS level (3%). Dynamic contact angle cycles allowed the evaluation of the hysteresis, which was found to be large and kinetically increasing in POSS‐modified samples. Film topography was analyzed by AFM, showing a more pronounced roughness in the nanostructured surface.The AFM image showing a moderate roughness increase.magnified imageThe AFM image showing a moderate roughness increase.

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Section: Introductionmentioning

confidence: 99%

Wettability of Polyhedral Oligomeric Silsesquioxane Nanostructured Polymer Surfaces

Turri

Levi

2005

Macromol. Rapid Commun.

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“…The POSS molecules have been successfully incorporated into many polymers, such as styryls, acrylics, liquid-crystalline polyesters, siloxanes, and polyamides. [22][23][24][25][26][27][28][29][30][31] Either by chemical or physical means, the POSS molecules can be dispersed in the polymer matrix by the adjustment of the chemical groups attached to the silicon atoms. The addition of POSS molecules can enhance many properties, such as heat resistance, oxygen permeation, and hardness.…”

Section: Introductionmentioning

confidence: 99%

Crystallization studies of isotactic polypropylene containing nanostructured polyhedral oligomeric silsesquioxane molecules under quiescent and shear conditions

Yang

Somani

et al. 2001

J Polym Sci B Polym Phys

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145

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Crystallization studies at quiescent and shear states in isotactic polypropylene (iPP) containing nanostructured polyhedral oligomeric silsesquioxane (POSS) molecules were performed with in situ small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). DSC was used to characterize the quiescent crystallization behavior. It was observed that the addition of POSS molecules increased the crystallization rate of iPP under both isothermal and nonisothermal conditions, which suggests that POSS crystals act as nucleating agents. Furthermore, the crystallization rate was significantly reduced at a POSS concentration of 30 wt %, which suggests a retarded growth mechanism due to the molecular dispersion of POSS in the matrix. In situ SAXS was used to study the behavior of shear-induced crystallization at temperatures of 140, 145, and 150°C in samples with POSS concentrations of 10, 20, and 30 wt %. The SAXS patterns showed scattering maxima along the shear direction, which corresponded to a lamellar structure developed perpendicularly to the flow direction. The crystallization half-time was calculated from the total scattered intensity of the SAXS image. The oriented fraction, defined as the fraction of scattered intensity from the oriented component to the total scattered intensity, was also calculated. The addition of POSS significantly increased the crystallization rate during shear compared with the rate for the neat polymer without POSS. We postulate that although POSS crystals have a limited role in shear-induced crystallization, molecularly dispersed POSS molecules behave as weak crosslinkers in polymer melts and increase the relaxation time of iPP chains after shear. Therefore, the overall orientation of the polymer chains is improved and a faster crystallization rate is obtained with the addition of POSS. Moreover, higher POSS concentrations resulted in faster crystallization rates during shear. The addition of POSS decreased the average long-period value of crystallized iPP after shear, which indicates that iPP nuclei are probably initiated in large numbers near molecularly dispersed POSS molecules.

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“…Fu et al 51,52 obtained two phenolic hydroxyl POSS by hydrosilylation, and then polymerization of the POSS with 4,4'-methylenebis (phenylisocyanate) and polytetramethylene glycol resulted in high-density polyurethane, as shown in Figure 7. XRD studies found that the POSS in the system formed micro-crystals.…”

Section: Hydroxy-possmentioning

confidence: 99%

POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance

Diao¹,

Mao²,

Zhang³

et al. 2015

Elastomers and Composites

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Polyhedral oligomeric silsesquioxane (POSS) is an important inorganic-organic hybrid material with a threedimensional structure. Polyurethane (PU) is a widely applied polymer that has versatile properties with the change of two phase structure. When POSS is incorporated into PU by physical or chemical methods, many properties can be greatly improved, such as mechanical properties, thermal stability, biodegradation resistance, and water resistance. This paper reviews the recent progress in preparation, structure, and performance of POSS-modified polyurethane from the viewpoint of physical blending and chemical modification.

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Nanoscale reinforcement of polyhedral oligomeric silsesquioxane (POSS) in polyurethane elastomer

Cited by 186 publications

References 16 publications

Wettability of Polyhedral Oligomeric Silsesquioxane Nanostructured Polymer Surfaces

Wettability of Polyhedral Oligomeric Silsesquioxane Nanostructured Polymer Surfaces

Crystallization studies of isotactic polypropylene containing nanostructured polyhedral oligomeric silsesquioxane molecules under quiescent and shear conditions

POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance

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