Mechanistic origins of multi-scale reinforcements in segmented polyurethane-clay nanocomposites

Rath, Sangram K.; Aswal, Vinod K.; Chandan, Mohammed Rehaan; Joshi, Kapil; Patri, M.; Harikrishnan, G.; Khakhar, D. V.

doi:10.1016/j.polymer.2014.08.035

Cited by 22 publications

(25 citation statements)

References 72 publications

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“…26 The decreasing I 3 and the fractional free volume can be attributed to the immobilization of the soft segments around the nanoclay platelets as the constrained region can diminish the formation of free volume holes, as can be seen from the decreasing I 3 with an increased constrained region fraction in Fig. 42 The constrained fraction region has been shown to be stiffer than the unaffected bulk in PCNs because of the lower mobility of polymer chains in this region. Fig.…”

Section: Resultsmentioning

confidence: 91%

“…In polyurethane/clay nanocomposites, preferential interactions of nanoclay with segment blocks are observed depending on the polarity of the latter. 42 In this section we provide further evidence of the existence of the constrained region by using WAXD, PALS and AFM. As regards the hard segment and nanoclay interactions, from FTIR analysis we have observed an increased degree of urethane hydrogen bonding for the nanocomposites compared to the pristine polymer.…”

Section: Resultsmentioning

confidence: 92%

“…From the image analysis of the TEM micrographs at different magnifications we reported, 42 an empirical aspect ratio of 18 AE 3 was determined for the intercalated nanoclay layers using the Fornes and Paul method. 42 The fractured surface of the neat matrix, on the other hand, shows patchy patterns believed to form during the brittle, unstable fracture in glassy polymers 50 and also in elastomers. 2 shows the FESEM micrographs of the air-substrate interfaces and the cross-section (freeze fractured) of the PBDPU and its nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

“…The objective of the present work is to understand the mechanistic origin of the barrier properties of the nanoclay filled segmented polybutadiene polyurethane-urea matrix. 42 We demonstrated that the polymer chains in the proximity of nanoclay are constrained because of their interactions with the welldispersed nanofillers, and these constrained polymer chains contributed to the enhancement of the mechanical properties from the nano-to macro-scale. There are several reports on the morphology-gas transport correlations of these model systems.…”

Section: Introductionmentioning

confidence: 88%

“…42 Briefly, the aromatic diamine chain extended polyurethane-urea and its nanocomposites were prepared by a two-step process consisting of the synthesis of a prepolymer using hydroxyl terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI), followed by chain extension with 4,4 0methylene bis(o-chloroaniline) (MOCA) using toluene as the solvent. 42 Briefly, the aromatic diamine chain extended polyurethane-urea and its nanocomposites were prepared by a two-step process consisting of the synthesis of a prepolymer using hydroxyl terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI), followed by chain extension with 4,4 0methylene bis(o-chloroaniline) (MOCA) using toluene as the solvent.…”

Section: Preparation Of Polyurethane-urea and Its Nanocompositesmentioning

confidence: 99%

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Characterizing the nanoclay induced constrained amorphous region in model segmented polyurethane–urea/clay nanocomposites and its implications on gas barrier properties

Rath

Sudarshan

Bhavsar

et al. 2016

Phys. Chem. Chem. Phys.

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There has been an increasing recognition of the fact that purely geometric factors associated with clay platelet dispersion in a polymer matrix cannot adequately explain the barrier properties of polymer/clay nanocomposites. The objective of the present work is to understand the nanoclay induced structural changes in a polyurethane-urea matrix and clay dispersion at different length scales using segment-specific characterization techniques and implications of the same in gas barrier properties using He, N2 and CO2 as probe molecules. Wide angle X-ray diffraction (WAXD) and positron annihilation life time spectroscopy (PALS) studies revealed nanoclay induced alterations in the chain packing of the amorphous soft segments of the polyurethane matrix at a molecular scale of a few Angstroms. The hard segment organization and the phase morphology of the nanocomposites, spanning length scales of several nanometers, were investigated by small angle X-ray scattering (SAXS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Furthermore, the presence of a constrained amorphous region surrounding the nanoclay was confirmed from AFM, WAXD and PALS results. Several pertinent structural variables from the gas transport point of view were deduced from these characterization techniques to understand the effect of the barrier properties in tandem with the clay dispersion morphology.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Preparation Of Polyurethane-urea and Its Nanocompositesmentioning

confidence: 99%

See 3 more Smart Citations

Characterizing the nanoclay induced constrained amorphous region in model segmented polyurethane–urea/clay nanocomposites and its implications on gas barrier properties

Rath

Sudarshan

Bhavsar

et al. 2016

Phys. Chem. Chem. Phys.

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Viscoelastic polyacrylate with hierarchical hollow zeolite for sound insulation

Ji²,

et al. 2023

J of Applied Polymer Sci

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Acoustic materials embed with inorganic fillers in viscoelastic polymers have promising applications in industrial settings. However, optimizing the sound insulation of composites by adjusting the microstructure of nanofillers remains a challenge. In this study, we synthesize adjustable hollow hierarchical Zeolite Socony Mobil #5 (ZSM-5) which can be used as nanofillers in a sound insulation nanocomposite based on the polyacrylate (PA). The results show that the nanocomposites with 0.5 wt% hierarchical hollow ZSM-5 can increase the sound transmission loss (STL) by 33.4%. The maximum STL value reaches as high as 40 dB. The damping properties of the nanocomposites were also improved by adding ZSM-5 into the PA matrix. When the loading of hollow ZSM-5 is 0.5 wt%, the storage modulus increased by 44%, as high as 4486.7 MPa. This strategy opens up a promising way for the sound insulation of composites based on controllable inorganic nanofillers.controllable filler, hierarchical hollow zeolite, sound insulator, viscoelastic | INTRODUCTIONNoise can greatly influence human health and the environment as a result of the growth of modern industrial and transportation systems. The application of sound insulation materials is widely regarded as an effective method to reduce noise. [1][2][3] The lightweight and high performance of polymeric materials are designed to address the typically conflicting engineering requirements encountered in many situations compare to traditional high quality, high density sound insulation materials such as reinforced concrete walls, 4,5 gypsum boards, 6 wood

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Modified titanate nanotubes for the production of novel aliphatic polyurethane nanocomposites

et al. 2018

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Aliphatic polyurethane (PU) nanocomposites were prepared using modified titanate nanotubes (TNTs) as filler in order to improve the mechanical and thermal properties of the initial polymer. With a view to achieving greater interaction between the polymer chains and TNTs, the latter was functionalized with hexamethylene diisocyanate (H) and/or aminopropyl trimethoxysilane groups (A), producing the modified nanotubes TNTH, TNTA, or TNTHA. The thermogravimetric analyses used to quantify the amount of anchored diisocyanate or/and silanol groups in the nanotubes identified the H function as the best functional group in terms of improving the filler-PU compatibility. Transmission electron microscopy, field emission scanning electron microscopy, and atomic force microscopy analyses of the PU nanocomposites containing the three different fillers showed good TNT dispersion. The TNTHA nanotubes functionalized with both groups through the reaction between the H function already anchored on the TNTs and the A group, forming a monourea anchored group, significantly improved the mechanical and thermal properties of PU nanocomposites. POLYM. COMPOS., 40:2292-2300, 2019.

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Mechanistic origins of multi-scale reinforcements in segmented polyurethane-clay nanocomposites

Cited by 22 publications

References 72 publications

Characterizing the nanoclay induced constrained amorphous region in model segmented polyurethane–urea/clay nanocomposites and its implications on gas barrier properties

Characterizing the nanoclay induced constrained amorphous region in model segmented polyurethane–urea/clay nanocomposites and its implications on gas barrier properties

Viscoelastic polyacrylate with hierarchical hollow zeolite for sound insulation

Modified titanate nanotubes for the production of novel aliphatic polyurethane nanocomposites

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