Isothermal Crystallization Kinetics of Novel Isotactic Polypropylene/MoS<sub>2</sub> Inorganic Nanotube Nanocomposites

Naffakh, Mohammed; Marco, Carlos; Gómez‐Fatou, Marian A.

doi:10.1021/jp111965b

Cited by 34 publications

(23 citation statements)

References 39 publications

(90 reference statements)

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“…The values of n reported in the literature are dispersed, ranging from 1.8 to 4.0. [35] As shown in Table 1, the values of n for pure PP and its nanocomposites ranged from 2.30 to 3.11 and were close to 3, implying a three-dimensional heterogeneously nucleated, spherulitic growth. [36,37] In the Avrami expression, the values of n of heterogeneous nucleation should be less than that of sporadic nucleation under the same crystal growth mechanism.…”

Section: Quiescent Crystallization Kinetics Of Ipp Nanocompositesmentioning

confidence: 79%

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Shi

Sun

Zhu

et al. 2012

Journal of Macromolecular Science, Part B

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Differential scanning calorimetry, x-ray diffraction, and polarized optical microscopy were used to investigate the quiescent crystallization and melting behavior of isotactic polypropylene (iPP) nanocomposites based on synthetic organic-soluble Ag nanocrystals (NCs). The effects of Ag loading and crystallization temperature on the crystallization behavior and crystalline structure were studied. The results showed that the synthetic Ag NCs as a novel effective β-crystal nucleating agent for iPP could promote the overall crystallinity, decrease the size of spherulites, and induce the formation of large amounts of β-crystals in the nanocomposites under quiescent crystallization. The relative content of β-crystals significantly increased with increasing Ag loading, and slightly increased with decreasing crystallization temperature. The quiescent crystallization kinetics was analyzed using the Avrami model. The results showed that the iPP nanocomposites with added Ag NCs had higher crystallization rate constant (k) and lower crystallization half-times (t 1/2 ) as well as the Avrami exponent (n) than pure iPP, indicating that the presence of Ag NCs acted as heterogeneous nucleating sites and promoted the crystallization rate of iPP.

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Section: Quiescent Crystallization Kinetics Of Ipp Nanocompositesmentioning

confidence: 79%

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Shi

Sun

Zhu

et al. 2012

Journal of Macromolecular Science, Part B

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“…In addition, the effect of MWCNTs on crystallization in PLA can be understood if the free energy concept is invoked for the formation of nucleus of a critical size. Naffak et al used the following expression to explain the crystallization behavior of nanotube reinforced polypropylene by means of free energy ( G * ) :

Δ G^{*} = \frac{4 b σ σ_{e} T_{m}^{0}}{Δ H_{m}^{o} Δ T}

where b is the layer thickness of the crystal, σ is the lateral surface energy, σ e is the fold surface energy, and Δ T is the undercooling, defined by

T_{m}^{o} - T_{c}

. Obviously, G * will decrease if σσ e decreases and Δ T increases.…”

Section: Resultsmentioning

confidence: 99%

Section: Crystallization Behaviormentioning

confidence: 99%

Structures and properties of injection-molded biodegradable poly(lactic acid) nanocomposites prepared with untreated and treated multiwalled carbon nanotubes

et al. 2013

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Structural, mechanical, thermal, and electrical properties of low‐loaded (0−1.5 wt%), untreated, and treated (with heat and nitric acid) multiwalled carbon nanotubes (MWCNTs)/poly (lactic acid) (PLA) nanocomposites have been studied. Among all synthesized composites, acid‐treated 1.0 wt% MWCNTs reinforced PLA shows superior tensile strength and modulus to those shown by other samples. All nanocomposites including the pure PLA exhibit the orthorhombic β‐form crystalline structure with low degree of crystallization, as demonstrated by X‐ray diffraction study. Differential scanning calorimetry (DSC) of injection molded samples, respectively, reveals an enhancement of PLA crystallinity by 8% and 14% for untreated and treated nanotubes, relating to the observed improvement in mechanical properties. Nanocomposites show double melting behavior when crystallized nonisothermally by DSC, whilst the pure PLA shows single melting character. Thermogravimetric analysis discloses that the MWCNTs‐loaded sample degraded faster than PLA. Surface resistivity of the nanocomposites is found to be dropped drastically by a factor of 1013 with a low loading of MWCNTs (1.5 wt%). A detailed discussion and correlation of the observed structures and properties are presented in this study. POLYM. ENG. SCI., 54:317–326, 2014. © 2013 Society of Plastics Engineers

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“…Excellent improvements in the thermal and mechanical properties at low concentrations of the hybrid in epoxy were obtained, when compared with their individual 2D counterparts. 15 The combination of different 2D nanomaterials was applied in a wide range of polymer systems as polyurethane, [22][23][24][25] polyester, 26 polyamides, 27,28 polypropylene, 29,30 polyamines, 31 polystyrenepoly(methylmethacrylate), 32 polycarbonates, epoxy 16,33-36 among others. The mixture of 2D nanomaterials in a single component can enable the production of novel materials in different technological applications with complementary properties.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity and mechanical properties of hybrid MoS₂/h‐BN polyurethane nanocomposites

Ribeiro

Trigueiro

Lopes

et al. 2018

J of Applied Polymer Sci

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Nanocomposites based on molybdenum disulfide (MoS2), hexagonal boron nitride (h‐BN) and hybrid MoS2/h‐BN nanofillers with different wt % in elastomeric polyurethane (PU) were studied with respect to their microstructure, thermal and mechanical properties. Tensile tests showed increases up to 80% in Young`s modulus for both h‐BN and hybrid MoS2/h‐BN composites. These results agree with dynamic mechanical analysis tests, which confirm an increase of up to 106% in storage modulus for hybrid MoS2/h‐BN with 0.5 wt % content. When the hybrid MoS2/h‐BN nanofillers were incorporated into the polymeric matrix, increases up to 102% in crosslink density were observed, indicating that strong interactions between the hybrid nanofillers and PU were established. However, the most important synergistic effect between the mixture of MoS2 and h‐BN nanoadditives was the increase of up to 752% in thermal conductivity with respect to neat polymer. Therefore, hybrid composites based in two‐dimensional MoS2/h‐BN nanofillers with multifunctional attributes can be applied in advanced polymeric materials that require high mechanical and thermal performance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46560.

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Isothermal Crystallization Kinetics of Novel Isotactic Polypropylene/MoS₂ Inorganic Nanotube Nanocomposites

Abstract: Abstract. Inorganic nanotubes (INT) were used for the first time to prepare advanced polymer nanocomposites by means of the most simple, cost-effective and ecologically friendly way (i.e. melt-processing route). The polymer matrix was isotactic polypropylene

Cited by 34 publications

References 39 publications

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Structures and properties of injection-molded biodegradable poly(lactic acid) nanocomposites prepared with untreated and treated multiwalled carbon nanotubes

Enhanced thermal conductivity and mechanical properties of hybrid MoS₂/h‐BN polyurethane nanocomposites

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Isothermal Crystallization Kinetics of Novel Isotactic Polypropylene/MoS2 Inorganic Nanotube Nanocomposites

Abstract: Abstract. Inorganic nanotubes (INT) were used for the first time to prepare advanced polymer nanocomposites by means of the most simple, cost-effective and ecologically friendly way (i.e. melt-processing route). The polymer matrix was isotactic polypropylene

Cited by 34 publications

References 39 publications

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Structures and properties of injection-molded biodegradable poly(lactic acid) nanocomposites prepared with untreated and treated multiwalled carbon nanotubes

Enhanced thermal conductivity and mechanical properties of hybrid MoS2/h‐BN polyurethane nanocomposites

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Product

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Isothermal Crystallization Kinetics of Novel Isotactic Polypropylene/MoS₂ Inorganic Nanotube Nanocomposites

Enhanced thermal conductivity and mechanical properties of hybrid MoS₂/h‐BN polyurethane nanocomposites