Effect of clay on melt crystallization, crystallization kinetics and spherulitic morphology of poly(trimethylene terephthalate) nanocomposites

Smith, L. A.; Vasanthan, Nadarajah

doi:10.1016/j.tca.2015.08.035

Cited by 13 publications

(8 citation statements)

References 56 publications

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“…These PTFE crystals formed under fast cooling presented an axialite morphology which does not favor the secondary crystallization as the lamellae appear to be thinner and do not have sufficient time to form perfectly, [40] contrary to spherulite or ribbon morphology that present thicker lamellae. The variations of T c displayed in Figure 4 between the two samples present similar amplitudes as the variation amplitudes of T c observed in the study of Smith et al [41] on Poly(trimethylene terephthalate) that were employed for kinetics analysis. Figure 5 displays the values of T c measured by non-isothermal DSC and FSC measurements during crystallization from the melt for the two samples.…”

Section: Resultssupporting

confidence: 77%

Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters

et al. 2019

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Polytetrafluoroethylene (PTFE) is a polymer that displays exceptional properties. This synthetic fluoropolymer is also known to crystallize very fast upon cooling. The present work highlights for the first time the influence of nanosilica clusters on PTFE crystallization at fast cooling rates (up to 5000 K·s−1). The silica was synthesized from aqueous silicate solution and the surface modification was performed using TriEthoxyFluoroSilane (TEFS). In order to understand the crystallization behavior of PTFE/silica nanocomposite at a fast cooling rate, the measurements were carried out by Fast Scanning Calorimetry (FSC). The data were consequently combined with the measurements performed by conventional Differential Scanning Calorimetry (DSC). Interestingly, the results displayed variation of the crystallization behavior for the nanocomposite at fast cooling rates compared to slow cooling rates. The differences in crystal morphologies were then observed by Scanning Electron Microscopy (SEM) after slow and fast cooling rates. Finally, the effective activation energies (Eα) obtained from the crystallization under various cooling rates were combined in order to obtain one set of Hoffman-Lauritzen parameters. This procedure allowed us to show that the crystallization of PTFE in the presence of silica is promoted or hampered according to the cooling rates employed.

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Section: Resultssupporting

confidence: 77%

Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters

et al. 2019

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“…The orientation of the crystalline lamella along or perpendicular to the spherulite radius is evident from Maltese cross pattern. It can also be seen that the spherulite size increases with increasing melt crystallization temperature, indicating a slower crystallization rate at higher temperature . The spherulite size of melt crystallized PTT nanocomposite with 5 wt % TEOS at 120 to 150 to 180 °C increases from about 50 to 70 to 100 μm, respectively.…”

Section: Resultsmentioning

confidence: 83%

“…It is well known that the crystallization plays a significant role in the properties of polymer nanocomposites. − Therefore, the effects of SiO 2 on isothermal and nonisothermal melt crystallization and cold crystallization behavior of PTT nanocomposites were investigated by means of differential scanning calorimetry (DSC). Thermal properties obtained from DSC scans are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Polymer nanocomposites derived from nanoscale additives and polymer matrix became interesting new type of composite materials. Several methods such as melt blending, intercalation, and in situ intercalative polymerization have been used for the preparation of these nanocomposites. − Among them, montmorillonite clay, − carbon nanotubes, and SiO 2 nanoparticles − are commonly used as nanofillers. The crystallization behavior of semicrystalline polymers in the presence of nanofillers has been investigated extensively; − and studies have shown that nanoparticles can influence the flow, crystallization, and the final morphology of the polymer.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization Studies of Poly(trimethylene terephthalate)/Silica Nanocomposites Prepared by Sol–Gel Technique

Bodempudi

Vasanthan

2018

ACS Omega

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Poly(trimethylene terephthalate) (PTT)/silica nanocomposite films were successfully fabricated using a novel sol–gel approach. The synthesis of these nanocomposites is being carried out by hydrolysis and condensation of tetraethoxysilane using trifluoroacetic acid with a small amount of water. The scanning electron microscopy and zetasizer result showed that the silica particles with a size range of 80–100 nm were homogeneously dispersed in the PTT matrix. The effect of different amounts of silica on crystallization of PTT was investigated using X-ray diffraction, differential scanning calorimetry (DSC), and optical microscopy. Polarized light microscopic results revealed that the spherulite size gradually decreased with increasing silica loading and increased with crystallization temperature for a given nanocomposite during isothermal melt crystallization. PTT with a small amount of SiO 2 melt crystallized at low temperatures showed banded spherulites. DSC results revealed that nonisothermal cold crystallization temperature decreased with silica content, whereas no significant change in nonisothermal melt crystallization behavior was observed with silica content. The crystallinity of isothermally melt crystallized PTT increased with both crystallization temperature and silica loading.

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“…Smith and Vasanthan [18] studied the effect of a commercial organo-modified montmorillonite (Cloisite ® 15A) on isothermal and non-isothermal melt crystallization behavior of PTT by differential scanning calorimetry (DSC) experiments and polarized light microscopy (POM). Also they evaluated the roll of nanoclay on conformational changes during melt crystallization using FTIR spectroscopy.…”

Section: Figurementioning

confidence: 99%

Crystallization Behavior of Polymer Nanocomposites

Cyras

D'amico

Manfredi

2018

Crystallization in Multiphase Polymer Systems

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This chapter is an overview of theeffect of the different nanofillers in the crystallization performance of polymer matrices. The mostrelevantnanocomposites were classified according to the natureofthereinforcement. In general, it was reported that the way of processing highly affect the crystal sizes, crystalline structure and the degree of crystallinity of semicrystalline polymer nanocomposites, then modifying the performance of the material. Therefore, the influence of differentcrystallization processesonbarrier, thermal stability, dynamic or mechanical properties ofnanocomposites was described. Moreover, it was observed that the crystallization mechanism of polymers in the nanocomposites strongly depends on the intrinsic characteristics of the nanoparticles and the matrix, and in consequence the dispersion of the filler in the matrix. This chapter focuses on the studies about the effect of different types of nanofillers on several aspects of polymer crystallization, such as kinetics, crystal structure, nucleation effect as well as spherulitic grow and morphology.

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Effect of clay on melt crystallization, crystallization kinetics and spherulitic morphology of poly(trimethylene terephthalate) nanocomposites

Cited by 13 publications

References 56 publications

Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters

Crystallization of Polytetrafluoroethylene in a Wide Range of Cooling Rates: Nucleation and Diffusion in the Presence of Nanosilica Clusters

Crystallization Studies of Poly(trimethylene terephthalate)/Silica Nanocomposites Prepared by Sol–Gel Technique

Crystallization Behavior of Polymer Nanocomposites

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