Morphology and properties of nanocomposites formed from ethylene-vinyl acetate copolymers and organoclays

Cui, Lili; Ma, Xiaoyan; Paul, Donald R

doi:10.1016/j.polymer.2007.08.040

Cited by 86 publications

(88 citation statements)

References 29 publications

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“…It is interesting to observe that this result could have been predicted from the XRD spectra of the two binary EVA/20A and EVA/43B master batches. The first one, in accordance with other spectra reported in the literature [318,319], corresponds to intercalated/exfoliated nanocomposites, in which all the tactoids were intercalated by EVA chains. In contrast, in the EVA/43B pattern, the original peak of 43B is still present and a new peak trace at a lower angle indicates a partially intercalated hybrid structure.…”

Section: The Asphalt-polymer-clay Ternary Systemsupporting

confidence: 89%

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Polacco

Filippi

Merusi

et al. 2015

Advances in Colloid and Interface Science

503

184

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During the last decades, the number of vehicles per citizen as well as the traffic speed and load has dramatically increased. This sudden and somehow unplanned overloading has strongly shortened the life of pavements and increased its cost of maintenance and risks to users. In order to limit the deterioration of road networks, it is necessary to improve the quality and performance of pavements, which was achieved through the addition of a polymer to the bituminous binder. Since their introduction, polymer-modified asphalts have gained in importance during the second half of the twentieth century, and they now play a fundamental role in the field of road paving. With high-temperature and high-shear mixing with asphalt, the polymer incorporates asphalt molecules, thereby forming a swallowed network that involves the entire binder and results in a significant improvement of the viscoelastic properties in comparison with those of the unmodified binder. Such a process encounters the well-known difficulties related to the poor solubility of polymers, which limits the number of macromolecules able to not only form such a structure but also maintain it during high-temperature storage in static conditions, which may be necessary before laying the binder. Therefore, polymer-modified asphalts have been the subject of numerous studies aimed to understand and optimize their structure and storage stability, which gradually attracted polymer scientists into this field that was initially explored by civil engineers. The analytical techniques of polymer science have been applied to polymer-modified asphalts, which resulted in a good understanding of their internal structure. Nevertheless, the complexity and variability of asphalt composition rendered it nearly impossible to generalize the results and univocally predict the properties of a given polymer/asphalt pair. The aim of this paper is to review these aspects of polymer-modified asphalts. Together with a brief description of the specification and techniques proposed to quantify the storage stability, state-of-the-art knowledge about the internal structure and morphology of polymer-modified asphalts is presented. Moreover, the chemical, physical, and processing solutions suggested in the scientific and patent literature to improve storage stability are extensively discussed, with particular attention to an emerging class of asphalt binders in which the technologies of polymer-modified asphalts and polymer nanocomposites are combined. These polymer-modified asphalt nanocomposites have been introduced less than ten years ago and still do not meet the requirements of industrial practice, but they may constitute a solution for both the performance and storage requirements.

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Section: The Asphalt-polymer-clay Ternary Systemsupporting

confidence: 89%

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Polacco

Filippi

Merusi

et al. 2015

Advances in Colloid and Interface Science

503

184

View full text Add to dashboard Cite

show abstract

“…Polyethylenes, such as LDPE and LLDPE are known to unfavorably interact with one-tail organoclays, in particular with 30B [31,52,53]. The XRD pattern of the LLDPE/30B composite prepared by melt compounding at moderate temperature, comprises a shoulder on the wide-angle side of the basal plane reflection of the clay (Fig.…”

Section: Dissolution/precipitation Of 30b Nanocomposites With Collapsmentioning

confidence: 99%

“…The collapse of the d-spacing of 30B has been observed in most studies on the preparation of PCNs based on polycarbonate [29], polystyrene [30], LDPE [31], polypropylene [1,32e37], chlorinated polyethylene [23], epoxy resin [38], ethylene-acrylic acid and ethylene-methacrylic acid copolymers [24,39], EVA [31,37,40e47], poly(ethylene oxide) (PEO) [48], etc. A d-spacing collapse was also seen in a number of cases [49e54] where PCNs loaded with different one-tailed organoclays were investigated.…”

Section: Introductionmentioning

confidence: 99%

On the interlayer spacing collapse of Cloisite® 30B organoclay

Filippi

Paci

Polacco

et al. 2011

Polymer Degradation and Stability

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“…onset s for the WPU/ChW nanocomposites. In the WPU/ChW nanocomposites, the rigidity was mainly contributed by the ChWs nanophase as filler [37] and the ordered hard-segment domain of WPU matrix. Although the ordered hardsegment domain of WPU matrix partly cleaved after adding ChW (seen in the discussion on the hydrogen bonding associated with -C=O in ordered domain), the logE' of all the WPU/ChW nanocomposites were still higher than that of neat WPU due to the reinforcing function of rigid ChW.…”

Section: Thermal Behaviour Of Nanocompositesmentioning

confidence: 99%

New waterborne polyurethane-based nanocomposites reinforced with low loading levels of chitin whisker

Huang¹,

Zou²,

Chang³

et al. 2011

Express Polym. Lett.

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New waterborne polyurethane (WPU)-based nanocomposites were prepared by incorporating low loading levels of chitin whiskers (ChWs) as the nanophase. The resultant WPU/ChW nanocomposites exhibited prominent enhancement in both strength and Young's modulus, and maintained an elongation of greater than ca. 500%. The ChW loading level of 3 wt% showed the maximum tensile strength (28.8 MPa) and enhanced Young's modulus (6.5 MPa), ca.1.8- and 2.2-fold over those of neat WPU. The active surface and rigidity of ChW facilitated formation of the interface for stress transferring and contributed to higher stress-endurance. As the ChW loading level increased, self-aggregation of ChWs resulted in a decrease in strength; however, the rigidity of ChW still supported the increase in Young's modulus, and the nanocompositescontaining 5 wt% ChWs had the highest Young's modulus (9.6 MPa). This work enriches the research into achieving high mechanical performance of waterborne polyurethane-based nanocomposites by introducing a natural nanofiller, and this high performance 'green' bionanocomposites will likely have promising prospects

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Morphology and properties of nanocomposites formed from ethylene-vinyl acetate copolymers and organoclays

Cited by 86 publications

References 29 publications

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

On the interlayer spacing collapse of Cloisite® 30B organoclay

New waterborne polyurethane-based nanocomposites reinforced with low loading levels of chitin whisker

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