Morphology and properties of thermoplastic polyurethane nanocomposites: Effect of organoclay structure

Chavarria, F.; Paul, Donald R

doi:10.1016/j.polymer.2006.08.067

Cited by 153 publications

(102 citation statements)

References 35 publications

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“…The nanoparticles act as nucleation sites promoting the formation of higher quantity of bubbles, and this trends to increase with the nanoparticles content, but at the same time, growth of the resulting cells seems to be hindered by the increase in viscosity. The increase in apparent density in foams modified with nanofillers has been reported elsewhere [32][33][34][35][36]. The tensile strength of unmodified flexible polyurethane foam is 106 kPa, and the elongation at break is 83 %.…”

Section: Mechanical Propertiessupporting

confidence: 65%

Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound

Piszczyk

Danowska

Mietlarek-Kropidłowska

et al. 2014

J Therm Anal Calorim

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This work presents thermal studies of nanocomposites based on the flexible polyurethane (PU) matrix and filled using montmorillonite organically modified with organophosphorus flame retardant compound. Flexible PU nanocomposite foams were prepared in the reaction carried out between reactive alcoholic hydroxyl and isocyanate groups with the ratio of NCO to OH groups equal to 1.05. The amount of an organoclay ranging from 3 to 9 vol% was added to the polyol component of the resin before mixing with isocyanate. The apparent density of PU foams was ranging from 0.066 to 0.077 g cm -1 . Thermal properties of the flexible PU nanocomposite foams were investigated by thermogravimetry and dynamical mechanical analysis. Glass transition temperatures (T g ) were defined as maximum peak on tand curve. Thermal decomposition was observed at 310-320°C (calculated from the onset of TG curve). Tensile strength of the PU foams was determined using mechanical test. The microstructure of the nanoparticles and the composites was investigated by X-ray diffraction. Finally, it was confirmed that the thermal and mechanical properties of flexible PU nanocomposite depend on the amount of nanoclay.

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Section: Mechanical Propertiessupporting

confidence: 65%

Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound

Piszczyk

Danowska

Mietlarek-Kropidłowska

et al. 2014

J Therm Anal Calorim

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“…Indentation has been successfully applied to several polymers, such as poly(methyl methacrylate) [10], and polymer systems [11][12][13][14][15][16][17][18][19][20], such as blends [21], copolymers [22,23], composites [24,25], bone cement [26], and multilayer systems [27]. However, its applicability is strictly limited by the probe dimension that allows spatial resolution of the order of tens of microns and does not allow the reconstruction of an accurate mapping of the sample surface.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Characterization of Complex Polypropylene Morphologies by HarmoniX AFM

Liparoti

Sorrentino

Speranza

2017

International Journal of Polymer Science

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This paper examines the capability of the HarmoniX Atomic Force Microscopy (AFM) technique to draw accurate and reliable micromechanical characterization of complex polymer morphologies generally found in conventional thermoplastic polymers. To that purpose, injection molded polypropylene samples, containing representative morphologies, have been characterized by HarmoniX AFM. Mapping and distributions of mechanical properties of the samples surface are determined and analyzed. Effects of sample preparation and test conditions are also analyzed. Finally, the AFM determination of surface elastic moduli has been compared with that obtained by indentation tests, finding good agreement among the results.

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“…For example, VASP of MMA on A-C18/C6MMT (sample 2) showed a high increment of 498.3 wt%, which meant that the product comprised 83.3 wt % of newly generated material and 16.7 wt% of the original C18/C6MMT. No change in weight was observed on [1,2] in Table 1 using C18/C6MMT without radical initiator. From XRD measurements, VASP samples of MMA on A-C18MMT and A-C18/C6MMT (samples 1 and 2) were confirmed to be exfoliated structures because of no 2θ peak being apparent in XRD profiles (Figure 1).…”

Section: Vasp Of Vinyl Monomers Withmentioning

confidence: 92%

“…Polymer/clay nanocomposites have brought about significant improvements in optical [1], mechanical [2,3], flameresistant [4][5][6][7], and gas barrier [8][9][10] properties over their corresponding pristine polymers and as such have been extensively studied. Moreover, because the improvements are expressed even at low concentrations of clay, the transparency of the original polymers is preserved.…”

Section: Introductionmentioning

confidence: 99%

Melt-Processable Nanocomposites Grafting-From Platelet Surfaces by Vapor-Assisted Surface Polymerization

Andou

Nishida

2011

ISRN Nanotechnology

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One issue accompanying the melt-processing polymer/clay nanocomposites is the reaggregation of silicate platelets, which induces decreases in advantages of nanocomposites. To address this issue, vapor-assisted surface polymerization (VASP) method was applied with an initiator-attached and copolymerizable surfactant moiety-bound A-C18/C6MMT to obtain the exfoliated and intercalated nanocomposites using methylmethacrylate and styrene as vinyl monomers, respectively. The melt processing of the nanocomposites was carried out by a melt-compression molding method at 200• C. From XRD measurements, the C18/C6MMT-based nanocomposites showed no change in d-spacing even after melt processing, indicating the maintenance of the exfoliation and intercalation states. This maintenance must result from polymer chains grafting from the silicate layer surfaces, thus clearly confirming the anchoring effect of the copolymerizable surfactant moiety units.

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Morphology and properties of thermoplastic polyurethane nanocomposites: Effect of organoclay structure

Cited by 153 publications

References 35 publications

Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound

Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound

Micromechanical Characterization of Complex Polypropylene Morphologies by HarmoniX AFM

Melt-Processable Nanocomposites Grafting-From Platelet Surfaces by Vapor-Assisted Surface Polymerization

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