Selective Orientation of Needlelike Sepiolite Nanoclay in Polymer Blend for Controlled Properties

Satyanarayana, M.; Sreenath, P.R.; Bhowmick, Anil K.; Kumar, K. Dinesh

doi:10.1021/acsomega.8b01618

Cited by 9 publications

(4 citation statements)

References 43 publications

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“…Additionally, interfacial bonding between the sepiolite and polymer chains was evidenced through the equilibrium swelling behavior of the composite that exhibits a restricted solvent swelling compared to the unfilled sample [ 64 , 65 ]. An excellent compatibility between natural rubber and the organophilic sepiolite was also observed by Satyanarayana et al [ 68 ]…”

Section: Orientation Of Polymer Compositessupporting

confidence: 61%

Infrared Linear Dichroism for the Analysis of Molecular Orientation in Polymers and in Polymer Composites

Bokobza

2022

Polymers

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The mechanical properties of polymeric materials are strongly affected by molecular orientation occurring under processing conditions. Infrared dichroism is particularly well suited for characterizing polymer chain orientation at a molecular level. The usefulness of this technique has been demonstrated through various applications in homopolymers, semi-crystalline polymers, copolymers, polymer blends, as well as in polymer composites. Determination of molecular orientation can be carried out in the mid- and near-infrared ranges and very small dichroic effects can be detected with the use of a photoelastic modulator. Chain orientation in polymer composites is seen to increase with the filler content in the case of a strong interface between the two phases, making possible a quantification of the degree of bonding between the host polymeric matrix and the incorporated inclusions.

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Section: Orientation Of Polymer Compositessupporting

confidence: 61%

Infrared Linear Dichroism for the Analysis of Molecular Orientation in Polymers and in Polymer Composites

Bokobza

2022

Polymers

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“…26 The reduction in tan δ peak height on addition of filler indicates polymer-filler interactions, which reduce segmental mobility of the polymer chains. 27 Therefore, hydrogen bonding between TiO 2 and the blend components played very important role in the reduction of tan δ peak.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

Optimized titanium dioxide loading for properties of natural rubber latex and acrylic emulsion blends

Worlee,

Hayeemasae,

Masa

2024

Journal of Elastomers & Plastics

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Blends of prevulcanized natural rubber (PVNR) and acrylic emulsion (AC) were prepared at the fixed PVNR/AC ratio of 30/70. Effects of titanium dioxide (TiO2) addition were optimized across the contents 0, 10, 20 and 30 parts per hundred parts of polymer (php) with respect to various properties. Morphological analysis revealed a two-phase system in which the PVNR particles were dispersed in the AC matrix. Incorporation of TiO2 induced a finer blend morphology in which a part of the TiO2 was located at the interfaces of blend components. The tensile strength increased with initial TiO2 loading and reached its maximum at 10 php loading, with an improvement by about 127% over the blend without filler. However, further increase in filler loading reduced the tensile strength, and the filler tended to agglomerate at those higher loadings. Thermal stability and storage modulus in rubbery region of the blends containing TiO2 were also improved over the unfilled blend, due to the improved morphology and the hydrogen bonds between TiO2 filler and polymer matrix. TiO2 improved water wettability and adhesion of the blend. The maximum peel strengths on wood and metal substrates were about 120% and 26% larger than for the reference unfilled blend. Such drastic improvements suggest that the filled blends may find applications as coating materials.

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“…It is worth noting that an increase in the amplitude of the Payne effect is associated in this case with a good level dispersion of carbon nanotubes, while in conventional composites, an improvement of filler dispersion decreases the Payne effect [61,77]. Clay nanofibers of sepiolite have also been used to reinforce elastomeric ma [44,87,88]. Chemical modification processes of the pristine sepiolite developed an tented by Tolsa make it compatible with low-polarity polymers.…”

Section: Rod-shaped Particlesmentioning

confidence: 99%

“…The present work only focuses on graphitic materials and especially on graphen single layer of sp 2 hybridized carbon atoms considered as the basic building unit fo Clay nanofibers of sepiolite have also been used to reinforce elastomeric matrices [44,87,88]. Chemical modification processes of the pristine sepiolite developed and patented by Tolsa make it compatible with low-polarity polymers.…”

Section: Layered Fillersmentioning

confidence: 99%

Elastomer Nanocomposites: Effect of Filler–Matrix and Filler–Filler Interactions

Bokobza

2023

Polymers

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The reinforcement of elastomers is essential in the rubber industry in order to obtain the properties required for commercial applications. The addition of active fillers in an elastomer usually leads to an improvement in the mechanical properties such as the elastic modulus and the rupture properties. Filled rubbers are also characterized by two specific behaviors related to energy dissipation known as the Payne and the Mullins effects. The Payne effect is related to non-linear viscoelastic behavior of the storage modulus while the Mullins or stress-softening effect is characterized by a lowering in the stress when the vulcanizate is extended a second time. Both effects are shown to strongly depend on the interfacial adhesion and filler dispersion. The basic mechanisms of reinforcement are first discussed in the case of conventional rubber composites filled with carbon black or silica usually present in the host matrix in the form of aggregates and agglomerates. The use of nanoscale fillers with isotropic or anisotropic morphologies is expected to yield much more improvement than that imparted by micron-scale fillers owing to the very large polymer–filler interface. This work reports some results obtained with three types of nanoparticles that can reinforce rubbery matrices: spherical, rod-shaped and layered fillers. Each type of particle is shown to impart to the host medium a specific reinforcement on account of its own structure and geometry. The novelty of this work is to emphasize the particular mechanical behavior of some systems filled with nanospherical particles such as in situ silica-filled poly(dimethylsiloxane) networks that display a strong polymer–filler interface and whose mechanical response is typical of double network elastomers. Additionally, the potential of carbon dots as a reinforcing filler for elastomeric materials is highlighted. Different results are reported on the reinforcement imparted by carbon nanotubes and graphenic materials that is far below their expected capability despite the development of various techniques intended to reduce particle aggregation and improve interfacial bonding with the host matrix.

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Selective Orientation of Needlelike Sepiolite Nanoclay in Polymer Blend for Controlled Properties

Cited by 9 publications

References 43 publications

Infrared Linear Dichroism for the Analysis of Molecular Orientation in Polymers and in Polymer Composites

Infrared Linear Dichroism for the Analysis of Molecular Orientation in Polymers and in Polymer Composites

Optimized titanium dioxide loading for properties of natural rubber latex and acrylic emulsion blends

Elastomer Nanocomposites: Effect of Filler–Matrix and Filler–Filler Interactions

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