Percolation networks and transient rheology of polylactide composites containing graphite nanosheets with various thicknesses

Wang, Yi; Cheng, Yuxin; Chen, Jianxiang; Wu, Defeng; Qiu, Yaxin; Yao, Xin; Zhou, Yanan; Chen, Chong

doi:10.1016/j.polymer.2015.04.076

Cited by 51 publications

(16 citation statements)

References 75 publications

(46 reference statements)

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“…A similar trend has also been reported for many other polymer nanocomposites containing the same types of particles with various sizes. 22,23 Therefore, it is reasonable to propose that the best dispersion state and fullest distribution of the treated nanosilica particles lead to the highest viscosity of TPEE-s20t, as can be seen in Figure 2. In this case, the treated silica nanoparticles present the highest effective volume-filling ratio and strongest flow suppression effect among the three kinds of nanosilicas, and as a result, the TPEE-s20t sample shows the most evident shear-thinning behavior during shear flow.…”

Section: Resultsmentioning

confidence: 94%

“…It is seen that the viscosity of TPEE-s20n is higher than that of TPEE-s50n, indicating that nanosilica particles with an average size of 20 nm have a higher effective volume ratio than the ones with an average size of 50 nm, according to the Krieger equation. , This is consistent with the TEM observation shown in Figure a,c. A similar trend has also been reported for many other polymer nanocomposites containing the same types of particles with various sizes. , Therefore, it is reasonable to propose that the best dispersion state and fullest distribution of the treated nanosilica particles lead to the highest viscosity of TPEE-s20t, as can be seen in Figure . In this case, the treated silica nanoparticles present the highest effective volume-filling ratio and strongest flow suppression effect among the three kinds of nanosilicas, and as a result, the TPEE-s20t sample shows the most evident shear-thinning behavior during shear flow.…”

Section: Resultsmentioning

confidence: 99%

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Nucleation of a Thermoplastic Polyester Elastomer Controlled by Silica Nanoparticles

Chen

et al. 2016

Ind. Eng. Chem. Res.

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Crystallization control of the hard polyester segments is an important way to design the final properties of a thermoplastic polyester elastomer (TPEE). In this work, the crystallization behavior of TPEE with nanosilica as the nucleating agent was studied. Three kinds of nanosilica with various sizes and surface treatments were chosen for nucleation design. The results reveal that all types of nanosilicas have evident nucleating effects, leading to a remarkable increase of the crystallization temperature of TPEE even by about 30 °C. However, the overall crystallization process is highly dependent on the particle size and surface treatment of silica because it is closely related to the nucleation ability of the particles and alteration of the system viscosities. The crystallization temperature of TPEE is more sensitive to the surface treatment of silica, while its crystallization rate shows a higher dependence on the particle size of silica. This work provides a facile way to well tailor crystallization of TPEE.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Nucleation of a Thermoplastic Polyester Elastomer Controlled by Silica Nanoparticles

Chen

et al. 2016

Ind. Eng. Chem. Res.

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“…As we all know that carbon spheres by HTC have been applied in the areas of adsorption, energy storage, catalyst support [33][34][35]. In this work, the addition of Cu in the carbon microspheres would provide a possibility for application in the antibacterial field.…”

Section: Catalytic Mechanism Of Cuso4 On the Formation Of Carbon Micrmentioning

confidence: 99%

Preparation and Characterization of Carbon Microspheres From Waste Cotton Textiles By Hydrothermal Carbonization

Zhang¹,

Hou²,

Guo³

et al. 2019

Journal of Renewable Materials

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Carbon microspheres were prepared from waste cotton fibers by hydrothermal carbonization (HTC) with the addition of copper sulphate in this work. The important influence factors, temperature, concentration of copper sulphate, resident time were explored here. The smooth and regular carbon microspheres could be formed at 330°C with 0.15 wt% copper sulphate after 6 h from waste cotton fibers. The crystal structures of cotton fibers were destructed in a short resident time with 0.15 wt% copper sulphate from SEM images and XRD patterns of solid products. This strategy provides a new, mild and efficient method to prepare carbon microspheres from waste cotton fibers by HTC. FTIR spectra verified that the abundant functional groups existed on the surface of synthesized carbon microspheres. From XPS and element analysis results, the copper sulphate participated in the forming process of carbon microspheres indeed. The presence of copper sulphate in the carbon microspheres provided a possibility for the application in antibacterial field. Besides, the catalytic mechanism of copper sulphate on the hydrolysis and carbonization of waste cotton fibers were also discussed. In conclusion, the copper sulphate is an efficient agent for preparing carbon microspheres by HTC from waste cotton fibers.

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“…For example, the shear modulus and the shear viscosity will normally increase with the addition of nanoparticles, known as the mechanical reinforcement. − The reinforcement has been found to vary at different time scales or in different states, usually more significant at a longer time scale. The NP percolation network, ,,− the entanglement network, − and the polymer bridging network ,,− have been suggested to account for the mechanical reinforcement in different states or at different time scales. For nanocomposites with stronger attractive particle–particle interaction, it is clear that the aggregation/agglomeration of nanoparticles is the key for the mechanical reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Mechanical Reinforcement for Weakly Attractive Nanocomposites in Glassy and Rubbery States

2021

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Polymer nanocomposites (PNCs) have been widely investigated due to their significant performance in mechanical reinforcement, but the mechanism of mechanical reinforcement is still an open challenge. In this work, we focus on the modulus reinforcement mechanism of weakly attractive poly(methyl methacrylate)/silica nanocomposites in both rubbery and glassy states with variable nanoparticle (NP) size, the molecular weight of the polymer matrix, loading fraction, and interaction strength. We find that the modulus reinforcement in both rubbery and glassy states is strongly related to the interfacial layer. In the glassy regime, the intrinsic modulus increases monotonically with the ratio between the particle radius and the radius of gyration of the polymer matrix, which results from the synergistic effects from the extent of stretching of adsorbed chains and the number of contacts between polymer segments and NPs. After deducting the part of particle substitution contribution, the increase of the effective plateau modulus with the NP content is ascribed to the additional entanglements from the trapped chains in the loops of adsorbed chains. An exponential dependence of the average entanglement molecular weight on the available interaction sites is deduced from the effective medium concept, which gives a quantitative description of experimental results.

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Percolation networks and transient rheology of polylactide composites containing graphite nanosheets with various thicknesses

Cited by 51 publications

References 75 publications

Nucleation of a Thermoplastic Polyester Elastomer Controlled by Silica Nanoparticles

Nucleation of a Thermoplastic Polyester Elastomer Controlled by Silica Nanoparticles

Preparation and Characterization of Carbon Microspheres From Waste Cotton Textiles By Hydrothermal Carbonization

Mechanism of Mechanical Reinforcement for Weakly Attractive Nanocomposites in Glassy and Rubbery States

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