Dynamic Mechanical Analysis of Clay–Polymer Nanocomposites

Panwar, Vinay; Pal, Kaushik

doi:10.1016/b978-0-323-46153-5.00012-4

Cited by 31 publications

(25 citation statements)

References 65 publications

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“…This also shows that the CNF reached the highest C at 10 wt% content, while the CNCs showed the highest value at 20 wt%. In addition, a supportive parameter can be used for characterizing particle interaction with the polymer matrix, known as a reinforcement efficiency factor— r [ 59 ]. The nanocomposite’s storage modulus ( E c ) and the polymer matrix’s storage modulus ( E m ) values are related by an empirical relationship, which can be written using Einstein’s considerations for suspensions with rigid particles [ 57 , 60 ]:

where V f —the volume fraction of a particle in the composite.…”

Section: Resultsmentioning

confidence: 99%

“…As expected, r for CNCs showed a higher value than that for CNF nanocomposites, 8.7 and 2.2, respectively. Dispersion issues resulting in agglomerates and imperfect bonding or a reduced contact surface between nanoparticles and the polymer influence the nanocomposite’s storage modulus values [ 59 ]. CNFs, similarly to previous observations, offered limited performance at contents above 10 wt%, as indicated by the r factor that had almost identical values for 10 to 30 wt% nanocomposites (1.45 and 1.5, respectively).…”

Section: Resultsmentioning

confidence: 99%

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Cellulose Nanocrystals vs. Cellulose Nanofibers: A Comparative Study of Reinforcing Effects in UV-Cured Vegetable Oil Nanocomposites

et al. 2021

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There is an opportunity to use nanocellulose as an efficient renewable reinforcing filler for polymer composites. There have been many investigations to prove the reinforcement concept of different nanocellulose sources for thermoplastic and thermoset polymers. The present comparative study highlighted the beneficial effects of selecting cellulose nanofibers (CNFs) and nanocrystals (CNCs) on the exploitation properties of vegetable oil-based thermoset composite materials—thermal, thermomechanical, and structural characteristics. The proposed UV-light-curable resin consists of an acrylated epoxidized soybean oil polymer matrix and two different nanocellulose reinforcements. High loadings of up to 30 wt% of CNFs and CNCs in irradiation-cured vegetable oil-based thermoset composites were reported. Infrared spectroscopy analysis indicated developed hydrogen-bonding interactions between the nanocellulose and polymer matrix. CNCs yielded a homogeneous nanocrystal dispersion, while CNFs revealed a nanofiber agglomeration in the polymer matrix, as shown by scanning electron microscopy. Thermal degradation showed that nanocellulose reduced the maximum degradation temperature by 5 °C for the 30 wt% CNC and CNF nanocomposites. Above the glass transition temperature at 80 °C, the storage modulus values increased 6-fold and 2-fold for the 30 wt% CNC and CNF nanocomposites, respectively. In addition, the achieved reinforcement efficiency factor r value for CNCs was 8.7, which was significantly higher than that of CNFs of 2.2. The obtained nanocomposites with enhanced properties show great potential for applications such as UV-light-processed coatings, adhesives, and additive manufacturing inks.

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where V f —the volume fraction of a particle in the composite.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cellulose Nanocrystals vs. Cellulose Nanofibers: A Comparative Study of Reinforcing Effects in UV-Cured Vegetable Oil Nanocomposites

et al. 2021

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“…The tanδ versus temperature graphs are generally utilized to obtain the glass transition temperatures (T g ) of samples, as in this work. [34][35] Whole viscoelastic data obtained from DMA are also tabulated in Table 2. Introduction of MO modifier led to 15% increase in storage modulus, as shown in Figure 5 (onset of the graph at 40 C).…”

Section: Dynamic Mechanical Analysis Resultsmentioning

confidence: 99%

Effect of methyl orange as the modifier on the mechanical, thermal, and thermo‐mechanical properties of clay/epoxy composites

Baştürk

2021

J of Applied Polymer Sci

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In this study, bentonite clay/epoxy composites were simply and successfully produced via conventional casting method for 0.5, 1, and 2 wt% filler content.Previously modified clay (surfactant and silane agent applied) was treated with methyl orange (MO) and its effects on composites were investigated in terms of crystallographic, thermal, thermo-mechanical, morphologic, and topographic aspects as well as quasi-static characteristics. According to XRD graphs, MO presence led to the increase of interlayer distance and resulted in partial intercalation for modified clay (MC) based mixture, while an opposite case was seen in neat clay (NC) blend. The 2 wt% MO/MC loaded composite achieved the highest tensile modulus, flexural stiffness, and hardness values among all samples-increase of 14%, 40%, and 3%, respectively. Same composite system exhibited improved results for both glass transition temperature (~7%") and storage modulus (~35%"), in spite of insufficient thermal characteristics. Irregular particles/tactoids were present in the fracture images, which probably promoted the stress concentration and caused the reduction of strength parameter for all composites. Furthermore, independent of clay type (MC or NC) whole structures showed similar surface roughness values but different topographic textures in terms of surface profiles.

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“…As anticipated, the MIL-53-NH 2 /MMA-based composites exhibit lower damping factor (tan ) compared to pure polymeric material, agreeing well with commonly observed trends (Table S8). 54 Furthermore, the shape of the stress-strain curves for 3DP polymeric and MOF based materials suggests the brittle nature of the acrylate crosslinked systems, whose chemical composition defines mechanical properties expressed in terms of Young's modulus (E), stress ( R ) and strain at break ( R ) values (Table S8) Certainly, the brittle behaviour of 3DP composite can also be noted on corresponding cross-section views ( Figure 4E, I and J), where typical brittle fracture patterns and cracks can be observed. It is worth noting that the MOF filler commonly contributes to an earlier rupture of 3DP composite, presumably due to formation of discretely localized heterogeneous inclusions and defects that can contribute to the origin and propagation of cracks.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Rapid fabrication of MOF-based mixed matrix membranes through digital light processing

et al. 2021

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Dynamic Mechanical Analysis of Clay–Polymer Nanocomposites

Cited by 31 publications

References 65 publications

Cellulose Nanocrystals vs. Cellulose Nanofibers: A Comparative Study of Reinforcing Effects in UV-Cured Vegetable Oil Nanocomposites

Cellulose Nanocrystals vs. Cellulose Nanofibers: A Comparative Study of Reinforcing Effects in UV-Cured Vegetable Oil Nanocomposites

Effect of methyl orange as the modifier on the mechanical, thermal, and thermo‐mechanical properties of clay/epoxy composites

Rapid fabrication of MOF-based mixed matrix membranes through digital light processing

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