Crystallization behavior of star-shaped poly(ethylene oxide) with cubic silsesquioxane (CSSQ) core

Mya, Khine Yi; Pramoda, K.P.; He, Chaobin

doi:10.1016/j.polymer.2006.04.068

Cited by 43 publications

(44 citation statements)

References 47 publications

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“…No new absorption bands were detected for the 10 wt.‐% apib‐POSS composite system (Figure 2), indicating that hydrogen bonding interactions would be very small – if they exist at all. It should be pointed out that the presence of these intermolecular interactions could affect the degree of association between the POM matrix and apib‐POSS molecules by affecting the molecular dynamics in the composite system 36, 37. However, it has been proved that the presence of hydrogen bonding between POM and POSS nanoparticles increases their mutual compatibility, but these interactions do not prevent POSS aggregation phase separation 38…”

Section: Resultsmentioning

confidence: 99%

Morphology and Thermomechanical Properties of Melt‐Mixed Polyoxymethylene/Polyhedral Oligomeric Silsesquioxane Nanocomposites

Sánchez‐Soto

Illescas

Milliman

et al. 2010

Macro Materials & Eng

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The influence of the functionalization of fully condensed POSS cages on the properties of POM‐based nanocomposites is studied. POSS with different organic substituents [glycidylethyl, aminopropylisobutyl, and poly(ethylene glycol)] are taken into account and melt mixed with POM. Good dispersion was achieved upon the addition of amino functionalized POSS, leading to an increase on the thermal decomposition temperature under nitrogen atmosphere up to 50 °C. However, µm‐size aggregates were observed for other nanocomposites. There is no significant change in other thermal properties of the nanocomposites. The relationships among these effects and the morphological characteristics of the systems were analyzed.magnified image

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Section: Resultsmentioning

confidence: 99%

Morphology and Thermomechanical Properties of Melt‐Mixed Polyoxymethylene/Polyhedral Oligomeric Silsesquioxane Nanocomposites

Sánchez‐Soto

Illescas

Milliman

et al. 2010

Macro Materials & Eng

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“…13,14 Therefore, the decrease in T c is attributed to the reduced segmental motion of PEO chains in the presence of the miscible PEG-POSS. Note that the mobility of the PEG that is covalently bonded to the POSS molecules is restricted by virtue of being covalently bonded to the inorganic portion of the POSS cage.…”

Section: Thermal Parameters and Crystallinitymentioning

confidence: 99%

“…It is also known that the silicon cage of POSS inhibits crystallization by reducing the segmental motion of PEO chains. 13,14 Therefore, the decrease in T c is attributed to the reduced segmental motion of PEO chains in the presence of the miscible PEG-POSS. Furthermore, the end groups of the organic PEG substituents, which are molecularly mixed with PEO chains in the crystalline phase, act as defects in the PEO crystallite, leading to a reduction in T m .…”

Section: Table I Thermal Characteristics Of Peo/ki/i 2 Poss/ki/i 2 mentioning

confidence: 99%

Thermal Behavior and Ion Conductivity of Polyethylene Oxide/Polyhedral Oligomeric Silsesquioxane Nanocomposite Electrolytes

2015

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We prepared and characterized nanocomposites of polyethylene oxide (PEO)/polyethylene glycol-polyhedral oligomeric silsesquioxane (PEG-POSS), all of which incorporated a KI/I 2 salt system, as electrolytes. Differential scanning calorimetry was used to investigate their melting and crystallization behaviors and to measure their respective degrees of crystallinity over mixing wide range of compositions. The degree of crystallinity reduced with POSS content, indicating restricted segmental motion of the polymer chains. Morphological observations were made using a polarized microscope, and the spherulite patterns observed in PEO/KI/I 2 collapsed with added POSS. A decrease in storage modulus was also observed by dynamic mechanical analysis. The ion conductivity measured by electrochemical impedance spectroscopy was enhanced from 1.19 × 10 −5 to 1.27 × 10 −4 S·cm −1 at 70 wt% POSS; presumably, this was due to the combined effects of lower crystallinity, lower glass transition, and lower modulus as POSS content increases. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21499; View this article online at wileyonlinelibrary.com.

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“…The presence of these intermolecular interactions could modify the degree of association between POM matrix and msib-POSS molecules by affecting the molecular dynamics in the composite system. 29,35,36 No new absorption bands were in fact detected for the 2.5 and 5 wt.% msib-POSS composite systems, however, indicating that if existing, hydrogen bonding interactions would be below the detection limit of the ATR equipment.…”

Section: Infrared Spectroscopymentioning

confidence: 92%

The morphology and properties of melt-mixed polyoxymethylene/monosilanolisobutyl-POSS composites

Illescas

Sánchez‐Soto

Milliman

et al. 2011

High Performance Polymers

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In this study, the morphology and thermo-mechanical behavior of composites formed by a polyoxymethylene (POM) matrix and monosilanolisobutyl polyhedral oligomeric silsesquioxane (msib-POSS) filler have been studied. The msib-POSS molecules were added to the POM by direct melt blending at loadings between 0 and 10 wt.%. Hydrogen bonding interactions were detected between POM and msib-POSS Si-OH groups, increasing their mutual compatibility and leading to nanometer-size dispersion of some msib-POSS molecules. These interactions do not prevent POSS aggregation during blending, but lead to micron-scale msib-POSS domains. The thermal decomposition temperature of the composites remained practically constant under inert and oxidative conditions. The low temperature thermal transition (g) and glass transition temperature (T g ) of POM were found to move to higher temperatures only when 2.5 wt.% of msib-POSS was added, indicating that POSS is physically linked to the POM chains, restricting their motion under those conditions. Low content (2.5 wt.%) of msib-POSS results in antiplastization, whereas higher levels of POSS lead to a decrease in the storage modulus of the polymer. The relationships among these effects and the morphological characteristics of the systems will be discussed herein.

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Crystallization behavior of star-shaped poly(ethylene oxide) with cubic silsesquioxane (CSSQ) core

Cited by 43 publications

References 47 publications

Morphology and Thermomechanical Properties of Melt‐Mixed Polyoxymethylene/Polyhedral Oligomeric Silsesquioxane Nanocomposites

Morphology and Thermomechanical Properties of Melt‐Mixed Polyoxymethylene/Polyhedral Oligomeric Silsesquioxane Nanocomposites

Thermal Behavior and Ion Conductivity of Polyethylene Oxide/Polyhedral Oligomeric Silsesquioxane Nanocomposite Electrolytes

The morphology and properties of melt-mixed polyoxymethylene/monosilanolisobutyl-POSS composites

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