Influence of Organic Modification and Polyurethane Structure on Clay Dispersion in Polyurethane–Clay Nanocomposites

Mallikarjuna, S. R.; Sivaram, Swaminathan

doi:10.1002/9783527659647.ch3

Cited by 2 publications

(1 citation statement)

References 133 publications

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“…The flexible soft segment is composed of long-chain diols, and the hard segment is formed by the reaction of diisocyanate, typically with a short diol chain extender. In attempts to broaden the typical property profiles to expand the range of possible applications, various types of functional nanofillers (e.g., carbon nanotubes, layered silicates, nanoclays) [1][2][3] have been incorporated into TPUs to pursue nanocomposites with better mechanical properties and thermal stability and low gas permeability. However, for biomedical devices, the biocompatibility/nontoxicity of TPU nanocomposites is also very important.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal stability of biomedical thermoplastic polyurethane with the addition of cellulose nanocrystals

Liu

Martin²,

Moon

et al. 2015

J of Applied Polymer Sci

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Freeze‐dried cellulose nanocrystals (CNCs) were dispersed in the thermoplastic polyurethane [Pellethane 2363‐55D (P55D)] by a solvent casting method to fabricate CNC‐reinforced nanocomposites. This study demonstrated that the addition of small amounts (1–5 wt %) of CNCs to P55D increased the thermal degradation temperature while maintaining a similar stiffness, strength, and elongation of the neat P55D. CNC additions to P55D did not alter the glass‐transition temperature, but the onset decomposition temperature was shifted from 286 to 327°C when 1 wt % CNCs was dispersed in the matrix. The higher onset decomposition temperature was attributed to the formation of hydrogen bonds between the hydroxyl groups on the CNC surface and urethane groups in the hard block of P55D. The ultimate tensile strength and strain to failure (εf) of the nanocomposites were minimally affected by additions up to 5 wt % CNCs, whereas the elastic modulus was increased by about 70%. The observation that εf was unchanged with the addition of up to 5 wt % CNCs suggested that the flow/sliding of the hard blocks and chains were not hindered by the presence of the CNCs during plastic deformation. The ramifications of this study was that CNC additions resulted in wider processing temperatures of P55D for various biomedical devices while maintaining a similar stiffness, strength, and elongation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41970.

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Section: Introductionmentioning

confidence: 99%

Enhanced thermal stability of biomedical thermoplastic polyurethane with the addition of cellulose nanocrystals

Liu

Martin²,

Moon

et al. 2015

J of Applied Polymer Sci

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Creation of Polymeric Nanocomposite

2023

Polymer-Inorganic Nanostructured Composites Based on Amorphous Silica, Layered Silicates, and Polyionenes

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The present chapter is focused on problems and challenges for creation of polymer composites using clay minerals. The main difficulties are shown to be the low thermal stability of modifying mineral additives, such as decomposition; of the most commercially available modifying additives, quaternary ammonium salts decompose below the processing temperatures of most polymers and their low long-term thermal stability during processing and operation. Extrapolation of research results to other objects is complicated because of insufficient understanding of the mechanism of this nanotechnology for specific polymer matrices. The main directions of development of this nanotechnology are shown to be the use of polymers and oligomers as heat-resistant modifying additives of clay minerals.

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Influence of Organic Modification and Polyurethane Structure on Clay Dispersion in Polyurethane–Clay Nanocomposites

Cited by 2 publications

References 133 publications

Enhanced thermal stability of biomedical thermoplastic polyurethane with the addition of cellulose nanocrystals

Enhanced thermal stability of biomedical thermoplastic polyurethane with the addition of cellulose nanocrystals

Creation of Polymeric Nanocomposite

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