A Study on Structure and Mechanical Properties of Polyurethane/Organic-Montmorillonite Nanocomposites

Wu, Shishan; Aimin, Cheng; Hua, Hongyan; Shen, Jian

doi:10.1080/03602550600609507

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…In the case of layered silicates like montmorillonites which exhibit high cationic exchange capacity (CEC) value the compatibilization step of inorganic compound with organic matrix was done by a cationic exchange process between silicate and protonated organic agents (cetyl trimethyl ammonium bromide, triphenyl phosphite, imidazolium salts) [22][23][24][25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

New Hybrid Materials Based on Modified Halloysite and Unsaturated Polyester Resin

Gârea

Ghebaur

Constantin

et al. 2011

Polymer-Plastics Technology and Engineering

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New hybrid materials based on unsaturated polyester resin and modified halloysite with different coupling agents were synthesized. The effect of functional groups grafted on the surface of halloysite against the properties of the final hybrids was studied using different characterization methods. The results of dynamic mechanical analyses showed that the glass transition temperature value of hybrids was strongly influenced by the halloysite modifier type. The concentration of halloysite and the modifier agent type influence the thermal stability of final hybrid materials.Keywords Halloysite; Hybrid materials; Unsaturated polyester resin; X-ray photoelectron spectroscopy INTRODUCTIONRecently the halloysite nanotubes (HNT) were used as nanofillers in polymer matrices and monomers such as linear low density polyethylene (LLDPE), polystyrene, polypropylene, epoxy resin, elastomers, natural rubber and ethylene propylene diene monomer (EPDM) .HNT represents a natural clay with a chemical structure similar with the kaolin minerals but with a distinct morphology. HNT exhibit different morphology depending on the soil from which they are extracted. The most interesting morphology of HNT is hallow nanotubular structure characterized by 20-50 nm in diameter and several hundreds nanometers in length [1] .As other layered silicates, halloysite in the natural state exhibits a high hydrophilic behavior and therefore a low compatibility with polymer matrix like epoxy resins, unsaturated polyester resins. In the case of layered silicates like montmorillonites which exhibit high cationic exchange capacity (CEC) value the compatibilization step of inorganic compound with organic matrix was done by a cationic exchange process between silicate and protonated

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Section: Introductionmentioning

confidence: 99%

New Hybrid Materials Based on Modified Halloysite and Unsaturated Polyester Resin

Gârea

Ghebaur

Constantin

et al. 2011

Polymer-Plastics Technology and Engineering

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“…This result also illustrates that organosilicate is dispersed and delaminated effectively in the segmented polyurethanes via melt processing route where molecular diffusion and shear stress play a good driving force for intercalation between the polymer and organosilicates. There are very few reports on polyurethane nanocomposites prepared by melt processing20–26 in spite of the obvious advantages of this approach than that of in situ polymerization and solution intercalation techniques. Since the possibility of direct melt intercalation was first demonstrated by Vaia and Giannelis,27 the melt intercalation method has become a primary method for the preparation of the intercalated polymer nanocomposites without in situ intercalative polymerization.…”

Section: Introductionmentioning

confidence: 99%

Effect of organoclay on thermal and dynamic mechanical properties of novel thermoplastic polyurethane nanocomposites prepared by melt intercalation technique

Barick

Tripathy

2010

Polymers for Advanced Techs

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Polymer nanocomposites based on thermoplastic polyurethane (TPU) containing organophilic montmorillonite (OMMT) were prepared by melt compounding method followed by compression molding. Different percentage of organically modified nanoclays (1, 3, 5, 7, and 9 wt%) was incorporated into the TPU matrix in order to examine the influence of the nanofillers on nanophase morphology and materials' properties. The microstructure morphology of the nanocomposites was examined by transmission electron microscopy (TEM), energy dispersion X-ray analysis (EDX), wide angle X-ray diffraction (WAXD), and atomic force microscope (AFM). The observation established that the organoclay is homogeneously dispersed and preferentially embedded in the TPU soft segment phase. Significant enhancement in the thermal stability of the nanocomposites was observed with the addition of the OMMT under thermogravimetric analysis (TGA). Dynamic mechanical properties of the TPU nanocomposites were analyzed using a dynamic mechanical thermal analyzer (DMTA), which confirms that the addition of OMMT has a strong influence on the storage and loss modulus of the TPU matrix.View this article online at wileyonlinelibrary.com EFFECT OF ORGANOCLAY ON TPU NANOCOMPOSITE Figure 12. Cole-Cole plot (plot of E 0 vs. E 00 ) of the pure TPU and TPU nanocomposites as a function of (a) temperature, (b) strain amplitude, and (c) frequency.View this article online at wileyonlinelibrary.com

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“…Poly(ester‐urethane) containing soft segments based on low molar mass PCL can present low degrees of phase separation that restrict soft segment segregation and therefore crystallization 33. The large halo around 2θ = 20° on the WAXS curves is typical of materials that have only short‐range order 33–36…”

Section: Resultsmentioning

confidence: 99%

Effect of the degree of clay delamination on the phase morphology, surface chemical aspects, and properties of hydrolyzable polyurethanes for periodontal regeneration

Pereira

Carvalho

Pereira

et al. 2009

J of Applied Polymer Sci

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In recent years, there has been increased interest in biodegradable polyurethanes for use in regenerative medicine because of their versatility and biocompatibility. Nevertheless, these polymers are usually produced using organic solvents that can lead to the release of toxic components. In this work, polyurethane/montmorillonite nanocomposites were designed to work as guided tissue regeneration membranes to treat periodontal diseases. Polyurethanes were synthesized in an aqueous environment. The composition, morphology, and mechanical properties of the biomaterials were evaluated. The cellular viability, proliferation, and morphology changes of rat culture cementoblasts were also investigated using a montmorillonite assay. Small-angle X-ray scattering, X-ray diffraction, and infrared spectroscopy results showed that the degree of clay delamination within the polymer was able to tailor the phase morphology of the polymer, the chemical aspects of the surface, the mechanical properties, and the kinetics of hydrolysis of the materials. The produced scaffolds provided a good environment for the adhesion and proliferation of cementoblasts and thus can be considered suitable biomaterials for participating in procedures associated with periodontal regeneration.

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A Study on Structure and Mechanical Properties of Polyurethane/Organic-Montmorillonite Nanocomposites

Cited by 16 publications

References 10 publications

New Hybrid Materials Based on Modified Halloysite and Unsaturated Polyester Resin

New Hybrid Materials Based on Modified Halloysite and Unsaturated Polyester Resin

Effect of organoclay on thermal and dynamic mechanical properties of novel thermoplastic polyurethane nanocomposites prepared by melt intercalation technique

Effect of the degree of clay delamination on the phase morphology, surface chemical aspects, and properties of hydrolyzable polyurethanes for periodontal regeneration

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