Understanding the effect of particle surface free energy on the structural and mechanical properties of clay-laden rigid polyurethane foams

Hooghten, Rob Van; Gyssels, Sarah; Estravís, Sergio; Rodríguez‐Pérez, Miguel Ángel; Moldenaers, Paula

doi:10.1016/j.eurpolymj.2014.08.029

Cited by 30 publications

(11 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values imply that clay platelets are preferentially located at the phase interface, with small amounts located within the PLA and PBSA phases. The literature values of the surface energies of PLA, PBSA, and Cloisite 30B led to the wetting coefficient of −0.72. The surface energy values at processing temperature were extrapolated from the experimental data at room temperature (using temperature coefficient of −0.06 (mN/m K) .…”

Section: Resultsmentioning

confidence: 99%

Reactive extrusion effects on rheological and mechanical properties of poly(lactic acid)/poly[(butylene succinate)‐co‐adipate]/epoxy chain extender blends and clay nanocomposites

Mirzadeh

Ghasemi

Mahrous

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(lactic acid) (PLA), a biosource, biodegradable polymer, is not suitable for some important polymer processing operations, such as film blowing and blow molding, due to its low melt strength. Moreover, while it has high tensile modulus and strength in the solid state, it exhibits low ductility. The present work is an extension of our earlier effort to improve the processability and mechanical properties of PLA by blending with poly[(butylene succinate)‐co‐adipate)] (PBSA), a biodegradable polymer with lower glass transition temperature. We evaluate the influences of incorporation of an epoxy chain extender and nanoclay on the properties of the blend. Since earlier work was conducted in a batch mixer, the influence of melt processing in the twin screw extruder and the differences between products obtained in the extruder and the batch mixer are evaluated and explained. Based on earlier work, the following PLA/PBSA blend ratios of 90:10, 80:20 and 70:30 were selected. All the samples were prepared in the twin‐screw extruder at two different screw speeds (50 and 150 rpm), to evaluate the effects of residence time and shear rates. The morphology and structure of the blends were examined using field emission scanning electron microscopy. Transmission electron microscopy (TEM) and X‐ray diffraction (XRD) were used to evaluate the levels of intercalation and exfoliation in the nanocomposites. The chain extension reaction was evaluated using nuclear magnetic resonance (NMR) spectroscopy and other techniques. Rheological properties (dynamic oscillatory shear and elongational viscosity measurements) and mechanical characteristics of the pure components, blends, and nanocomposites were studied and discussed in light of the composition and morphology of the blends and the nanocomposites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42664.

show abstract

Section: Resultsmentioning

confidence: 99%

Reactive extrusion effects on rheological and mechanical properties of poly(lactic acid)/poly[(butylene succinate)‐co‐adipate]/epoxy chain extender blends and clay nanocomposites

Mirzadeh

Ghasemi

Mahrous

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The hydrogen boned water will participate in blowing reaction in the later stage of foaming process, leading to the localized rapture of cell film around MMT particles. The contact angle of OMMT grafted with alkyl chain (77.0±1.3°) is larger than that of MMT, indicating that OMMT is less wetted by water and polyol which own hydrophilic groups [23,31]. Thus OMMT as insoluble particles mainly demonstrate an ability of bridging cell film by entering both air-liquid interfaces followed by cell film rupture due to capillary pressure forces and gravitational function [29].…”

Section: Mechanical Propertiesmentioning

confidence: 86%

Effect of nano-montmorillonite as cell opener on cell morphology and resilient performance of slow-resilience flexible polyurethane foams

et al. 2015

View full text Add to dashboard Cite

In this paper, polypropylene glycol Y-1900, unmodified nano-montmorillonite (MMT) and organically modified nano-montmorillonite (OMMT) serving as cell openers are introduced into slow-resilience flexible polyurethane foams (FPUFs), aiming at investigating the effects of them on cell morphology and the relationships between cell structure, nano-montmorillonite types and resilient performance of slow-resilience FPUFs. Experimental results indicate that OMMT can sever as an excellent alternative for conventional cell openers. The ability of nanomontmorillonite to open cells mainly depends on their surface property. Both MMT and OMMT are exfoliated in foaming process and play a significant role in cell diameter for nucleating function. The resilient performance of foams is closely related to open cell content and polyurethane matrix nature, due to that the friction effect of nanomontmorillonite and the deformation of open cells will lead to large energy dissipation. The mechanical properties (tensile strength, elongation at break and compression set) are related to cell structure and nano-montmorillonite. The addition of nano-montmorillonite especially organically modified nano-montmorillonite is an effective method to improve resilient performance and mechanical strength.However, this improvement is at the expense of impairing toughness of foams.

show abstract

“…8, we use PVP as a shape directing agent, which can affect the surface free energy. The amount of surface free energy is an important reason for nuclei clustering together to form nanoparticles [21]. NaOH was added as strong base to form Cu(OH) 2 nuclei.…”

Section: Growth Mechanismmentioning

confidence: 99%

Gas sensing property of novel flower-like nanostructure CuO

Zhu

Zeng

Cao

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Here we report a simple hydrothermal route for the preparation of CuO nano-flower which has been proved to exhibit good performances in gas-sensing. We concentrate on the microstructure and morphology of CuO by adjusting the reaction time length. Four different morphologies that formed a flower-like shape with a diameter of 1-3 lm were obtained. The CuO nanostructures were characterized in detail by means of X-ray diffraction and scanning electron microscopy and were apparently seen that they were composed of abundant aggregative nanobelts. The prepared CuO properties in gas-sensing were also measured in our experiments. In addition, a proper growth mechanism was proposed based on the results. Moreover, the CuO nano-flowers may resolve the difficulties in low-dimensional gas-sensing applications after more research having been conducted.

show abstract

Understanding the effect of particle surface free energy on the structural and mechanical properties of clay-laden rigid polyurethane foams

Cited by 30 publications

References 53 publications

Reactive extrusion effects on rheological and mechanical properties of poly(lactic acid)/poly[(butylene succinate)‐co‐adipate]/epoxy chain extender blends and clay nanocomposites

Reactive extrusion effects on rheological and mechanical properties of poly(lactic acid)/poly[(butylene succinate)‐co‐adipate]/epoxy chain extender blends and clay nanocomposites

Effect of nano-montmorillonite as cell opener on cell morphology and resilient performance of slow-resilience flexible polyurethane foams

Gas sensing property of novel flower-like nanostructure CuO

Contact Info

Product

Resources

About