Solvent Effect on the Morphology of Lamellar Nanocomposites Based on HIPS

Silva, Paulo Sergio Rangel Cruz da; Tavares, Maria Inês B.

doi:10.1590/1516-1439.307314

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…The polymer mass, chemical structure, semi-crystallinity, chemical solubility, and thermal stability, and the nanoparticle surface area, chemical structure, and dispersion are essential for obtaining polymer nanocomposites and understanding their behavior. There are several methods to obtain polymeric nanocomposites, such as modified emulsion polymerization [ 7 ], in situ polymerizations [ 8 , 9 ], via direct blending (mechanical mixing) [ 10 , 11 ], solution dispersion [ 12 , 13 , 14 ], the sol-gel method and melt compounding [ 15 , 16 ], selective laser sintering process [ 17 ], and melt extrusion and injection molding [ 18 , 19 ]. Each process is specific, but the final morphology of the nanocomposites plays an important role.…”

Section: Introductionmentioning

confidence: 99%

Synergic Effect of TiO2 Filler on the Mechanical Properties of Polymer Nanocomposites

2021

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Nanocomposites with polymer matrix offer excellent opportunities to explore new functionalities beyond those of conventional materials. TiO2, as a reinforcement agent in polymeric nanocomposites, is a viable strategy that significantly enhanced their mechanical properties. The size of the filler plays an essential role in determining the mechanical properties of the nanocomposite. A defining feature of polymer nanocomposites is that the small size of the fillers leads to an increase in the interfacial area compared to traditional composites. The interfacial area generates a significant volume fraction of interfacial polymer, with properties different from the bulk polymer even at low loadings of the nanofiller. This review aims to provide specific guidelines on the correlations between the structures of TiO2 nanocomposites with polymeric matrix and their mechanical properties. The correlations will be established and explained based on interfaces realized between the polymer matrix and inorganic filler. The paper focuses on the influence of the composition parameters (type of polymeric matrix, TiO2 filler with surface modified/unmodified, additives) and technological parameters (processing methods, temperature, time, pressure) on the mechanical strength of TiO2 nanocomposites with the polymeric matrix.

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Section: Introductionmentioning

confidence: 99%

Synergic Effect of TiO2 Filler on the Mechanical Properties of Polymer Nanocomposites

2021

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“…When polymer-layered silicate nanocomposites (PLSN) are prepared, some structure types are obtained: intercalated nanocomposites, where the polymer chains are intercalated in the galleries, but the periodicity of the clay lamellae is still intact; delaminated or exfoliated nanocomposites, where the lamellae are far apart from each other so that the periodicity of this layer arrangement is totally lost, allowing that delaminated silicates are uniformly dispersed in the matrix [7] [8]; or a mix of both, which is more common, since the dispersion and distribution of nanoparticles are not straightforward. One important point to obtain good nanomaterials is the polymer/nanoparticle pair, and consequently the nanoparticles' dispersion in the polymer matrix [9], which depends on the chemical structure of the polymer and nanoparticle and the mixing process as well. For PLSN, the properties are directly correlated with the exfoliated/intercalated regions, which in turn result from the dispersion/distribution of the nanoclay layers in the polymeric matrix [10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Organoclay Structure on Nanostructured Materials Based on Eva

Iulianelli

Sebastião²,

Tavares³

et al. 2015

MSA

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This article reports the preparation of a series of EVA nanocomposites employing solution casting methods using different types of organo-modified montmorillonite clay. The effect of the organoclay type on the structural organization and thermal behavior of EVA nanostructured materials were systematically investigated. Regarding thermal behavior, the thermogravimetric analysis showed that the nanocomposites presented a slight decrease in thermal degradation temperature compared to EVA, while differential scanning calorimetry, in general, did not show a significant change in the thermal transition temperatures such as glass transition, melting temperature and crystallization temperature of the nanocomposites, regardless of the type and proportion of organoclay in the systems. With respect to structural aspect, the X-ray diffractograms showed that all systems presented a heterogeneous distribution of the nanoparticles, containing part intercalated. Nuclear magnetic resonance relaxometry data provided complementary information for the X-ray results, showing that the EVA systems containing 5 wt% of both studied organoclays presented a mixture of intercalated and exfoliated structures, evidencing that there was a surface interaction between polymer chains and clay lamellae.

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“…High Impact Polystyrene films were also obtained as described above without adding the ViscogelS7 in order to compare the obtained materials. The samples were named considering the polymer and pair of solvents used (HTC), and the proportion of organoclay used varied from 0 to 3 wt% (HTC0, HTC1, HTC2 and HTC3) [25].…”

Section: Nanocomposite Preparationmentioning

confidence: 99%

Spin-Spin Relaxation Time to Evaluate Degradation of HIPS/Organoclaynano Composites by Aging

Silva¹,

Iulianelli²,

Tavares³

2017

MSA

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NMR relaxometry is one of the techniques that allow observing changes in the molecular mobility that come from materials' morphology. T 1 H has been used to monitor food and polymer sciences. However, T 2 H, although being a revealing as T 1 H, is rarely used to analyze changes in thermoplastic systems it is more sensitive to the mobile region. High Impact Polystyrene nanomaterials were prepared through solution casting and were exposed for different times to UV light in the air. The samples, removed after each exposure interval, were characterized by T 2 H, focusing on the changes in the relaxation data. The results for this parameter showed that the changes in the relaxation data come from the competition of chain scission and chain recombination processes, which occurs due to the UV light influence with increased time. The T 2 H data indicated that the clay ratio can influence the chain degradation processes, acting to inhibit or accelerate the aging process [1] [2].

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Solvent Effect on the Morphology of Lamellar Nanocomposites Based on HIPS

Cited by 10 publications

References 17 publications

Synergic Effect of TiO2 Filler on the Mechanical Properties of Polymer Nanocomposites

Synergic Effect of TiO2 Filler on the Mechanical Properties of Polymer Nanocomposites

Influence of Organoclay Structure on Nanostructured Materials Based on Eva

Spin-Spin Relaxation Time to Evaluate Degradation of HIPS/Organoclaynano Composites by Aging

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