Effect of the silsesquioxane structure on the mechanical properties of the silsesquioxane-reinforced polymer composite films

Hwang, Seon Oh; Lee, Ju‐Yeon

doi:10.1016/j.porgcoat.2019.105316

Cited by 15 publications

(9 citation statements)

References 49 publications

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“…The measured XRD patterns were similar to the XRD patterns of the POSS mixture and LPSQ [ 58 ]. In addition, EPSQ d-spacing 2 showed a stronger intensity than the XRD data from other studies with similar structures [ 29 ].…”

Section: Resultssupporting

confidence: 57%

“…The broad diffraction peak at 7.1° indicates the chain-to-chain length (d-spacing 1) of an interdigitated molecule by the side chain of the EPOSS molecule. [ 58 ] The d-spacing (d1) of the EPOSS film was 1.24 nm (λ = 2dsinθ). On the other hand, the broad diffraction peak at 17.5° indicates the average thickness (d-spacing 2) of EPOSS molecules.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the broad diffraction peak at 17.5° indicates the average thickness (d-spacing 2) of EPOSS molecules. [ 58 ] The d-spacing (d2) of the EPOSS film was 0.50 nm. Unlike the EPOSS film, in the out-of-plane diffraction peak of the EPSQ film, broad diffraction peaks appeared at approximately 6.3 and 18.0°.…”

Section: Resultsmentioning

confidence: 99%

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Hard Coating Materials Based on Photo-Reactive Silsesquioxane for Flexible Application: Improvement of Flexible and Hardness Properties by High Molecular Weight

et al. 2021

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EPOSS of polyhedral oligomeric silsesquioxanes (POSS) mixture structure and LPSQ of ladder-like polysilsesquioxane (LPSQ) structure were synthesized via sol–gel reaction. EPSQ had a high molecular weight due to polycondensation by potassium carbonate. The EPSQ film showed uniform surface morphology due to regular double-stranded structure. In contrast, the EPOSS-coated film showed nonuniform surface morphology due to strong aggregation. Due to the aggregation, the EPOSS film had shorter d-spacing (d1) than the EPSQ film in XRD analysis. In pencil hardness and nanoindentation analysis, EPSQ film showed higher hardness than the EPOSS film due to regular double-stranded structure. In addition, in the in-folding (r = 0.5 mm) and out-folding (r = 5 mm) tests, the EPSQ film did not crack unlike the EPOSS coated film.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

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Hard Coating Materials Based on Photo-Reactive Silsesquioxane for Flexible Application: Improvement of Flexible and Hardness Properties by High Molecular Weight

et al. 2021

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“…PSQ can be prepared by the hydrolysis and polycondensation of trialkoxysilane, and a coating film can be obtained using a solution process because of its excellent film formability. Therefore, PSQ has been studied in various fields, such as optical materials, gate insulator materials, low-dielectric-constant materials, and scratch-resistant materials. − …”

Section: Introductionmentioning

confidence: 99%

Robust and Transparent Antifogging Polysilsesquioxane Film Containing a Hydroxy Group

et al. 2022

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Poly(glycidyloxypropyl)silsesquioxane (PGPS) was successfully synthesized by hydrolysis and polycondensation using the nitrogen flow method. A poly(3-(2,3-dihydroxypropoxypropyl)silsesquioxane) (PSQ-OH) film was prepared via two routes. In route A, PSQ-OH was prepared by the hydrolysis of the epoxy group of PGPS in an aqueous hydrochloric acid (HCl)/tetrahydrofuran solution, affording a diol group; then, PSQ-OH was coated on a glass substrate and heated. The antifogging performance of the PSQ-OH film was evaluated in terms of water uptake (WU) and scratch resistance. The obtained PSQ-OH film exhibited a low WU of 5% and a scratch resistance of 1.6. In route B, PGPS was coated on a glass substrate and immersed in a 0.5 mol/L aqueous sulfuric acid solution for 1–15 h at room temperature, producing a diol group. The solid-state 13C nuclear magnetic resonance spectrum indicated that the epoxy group was completely hydrolyzed after immersion for 15 h. The WU of the PSQ-OH film prepared via route B increased from 5 to 19% with the increase in the immersion time and was higher than that of the PSQ-OH film prepared via route A. The PSQ-OH film on a glass substrate retained transparency under water vapor exposure at 60 °C. The PSQ-OH film prepared via route B exhibited a high scratch resistance of 2.7–3.6, similar to that of a poly(3-(2-aminoethylaminopropyl)silsesquioxane) film. The scratch resistance of the PSQ-OH film was 5–7 times higher than that of the poly(vinyl alcohol) film. The PSQ-OH film was uniform with no pinholes and cracks. The PSQ-OH film was transparent and colorless and exhibited a high transmittance of >90% in the wavelength range of 400–800 nm. Overall, the prepared PSQ-OH film exhibits good antifogging, transparency, and mechanical properties.

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“…Pcrit and hcrit data from 5000 μN ramping force nanoscratch tests, performed on PP and PP hybrid composites, are shown in Figure 14 c. The highest Pcrit and hcrit values were obtained for the composite DL, prepared by the dilution of LMB330-1 masterbatch, which is considered to have the best scratch resistance properties [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

The Effect of SEBS/Halloysite Masterbatch Obtained in Different Extrusion Conditions on the Properties of Hybrid Polypropylene/Glass Fiber Composites for Auto Parts

et al. 2021

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Masterbatches from a linear poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) and halloysite nanotubes (HNT-QM) were obtained in different conditions of temperature and shear using two co-rotating twin-screw extruders. The influence of screw configuration and melt processing conditions on the morpho-structural, thermal and mechanical properties of masterbatches at macro and nanoscale was studied. A good dispersion of halloysite nanotubes and better thermal stability and tensile and nanomechanical properties were obtained at a lower temperature profile and higher screw speed. The effect of masterbatches, the best and worst alternatives, on the properties of a polypropylene (PP)–glass fiber (GF) composite was also evaluated. Double hardness, tensile strength and modulus and four times higher impact strength were obtained for PP/GF composites containing masterbatches compared to pristine PP. However, the masterbatch with the best properties led further to enhanced mechanical properties of the PP/GF composite. A clear difference between the effects of the two masterbatches was obtained by nanoindentation and nanoscratch tests. These analyses proved to be useful for the design of polymer composites for automotive parts, such as bumpers or door panels. This study demonstrated that setting-up the correct processing conditions is very important to obtain the desired properties for automotive applications.

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Effect of the silsesquioxane structure on the mechanical properties of the silsesquioxane-reinforced polymer composite films

Cited by 15 publications

References 49 publications

Hard Coating Materials Based on Photo-Reactive Silsesquioxane for Flexible Application: Improvement of Flexible and Hardness Properties by High Molecular Weight

Hard Coating Materials Based on Photo-Reactive Silsesquioxane for Flexible Application: Improvement of Flexible and Hardness Properties by High Molecular Weight

Robust and Transparent Antifogging Polysilsesquioxane Film Containing a Hydroxy Group

The Effect of SEBS/Halloysite Masterbatch Obtained in Different Extrusion Conditions on the Properties of Hybrid Polypropylene/Glass Fiber Composites for Auto Parts

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