Crystallization kinetics and morphology of melt spun poly(ethylene terephthalate) nanocomposite fibers

Hegde, Raghavendra R.; Bhat, Gajanan; Deshpande, Bhushan

doi:10.3144/expresspolymlett.2013.79

Cited by 12 publications

(9 citation statements)

References 32 publications

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“…A nanoclay dispersion instead of conventional micron sized additives is currently being used to increase the opacity, modulus, tensile strength, barrier properties, flame resistance, and thermal and structural properties of many plastics. Studies have often shown enhanced properties in the final products derived by clay loading as low as 0.5 wt% compared with conventional composites with a large amount of fillers …”

Section: Introductionmentioning

confidence: 99%

Investigation of the morphology of polypropylene − nanoclay nanocomposites

2013

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The morphology development in polypropylene − nanoclay composites with different weight percentages of nanoclay additives was studied using a combination of wide-angle X-ray diffraction, small-angle X-ray scattering (SAXS), polarized optical microscopy and transmission electron microscopy. SAXS studies showed an increase in long period with increase in additive weight percentage. Thermal analysis showed that even if the clay platelets are not completely exfoliated they can act as effective nucleating agents. Studies indicated that the ultimate morphology formation is influenced by both the thermodynamics of mixing and crystallization and spherulite formation. During spherulite growth, unenclosed clay platelets were excluded at the spherulite boundaries. From the observed results, a schematic model of morphology formation in polypropylene − nanoclay composites is proposed.

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Section: Introductionmentioning

confidence: 99%

Investigation of the morphology of polypropylene − nanoclay nanocomposites

2013

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“…Samples of approximately 5 mg in weight were heated at a temperature in the 40–300 °C range in nitrogen environment at a ramp rate of 5 °C/min. The degree of crystallinity was then measured using the following equation:

χ % = \frac{Δ H}{Δ H_{\infty}} \times 100

…”

Section: Methodsmentioning

confidence: 99%

“…Here

χ %

is the degree of crystallinity, Δ H the measured heat of fusion of the PET nonwovens, and

Δ H_{\infty}

the theoretical heat of fusion of a 100% crystalline PET sample. Note that, Δ H is measured as the area under the melting peak of the DSC curve obtained using the Universal Analysis software, and

Δ H_{\infty}

= 115 J/g for PET . It should be emphasized that the method of characterizing the degree of crystallinity by DSC should only be used in a comparative study of the same polymer samples.…”

Section: Methodsmentioning

confidence: 99%

Polymer adhesion in heat‐treated nonwovens

Staszel

Yarin

Pourdeyhimi

2017

J of Applied Polymer Sci

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Polymer adhesion and sintering in compound nonwovens was studied. Nonwovens containing a mixture of binding bicomponent (BICO) fibers embedded in a fibrous matrix were heated to melt the outer shell of BICO fibers and interlock the matrix to create stiff load-bearing surfaces. It was found that stiffness depends on heat-treatment regimes. In low-temperature regimes, BICO fibers melt, but do not fully flow and encase the surrounding filler matrix. At sufficiently high temperatures, the shells of BICO fibers melt and flow which results in encasing the neighboring filler fibers. This results in an abrupt increase in the nonwoven stiffness which is independent of heat-treatment temperature. At significantly high temperatures, the filler matrix fibers sinter to each other leading to a further increase in stiffness. The experiments were conducted with co-polymers frequently used in the shells of BICO to demonstrate the interlocking mechanism characteristic of these compound nonwovens. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46165.

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“…The scattered phase should be used in a quantity not lower than the percolation threshold. The value of Electrical Properties of Polyesters http://dx.doi.org/10.5772/intechopen.78612 percolation threshold depends on the coefficient of the shape of conducting particles, their dimensions and arrangement in the matrix [54][55][56]. Particularly beneficial is the use of nanophase scattered in PET and PLA [57][58][59][60][61][62][63][64].…”

Section: Imparting Electro-conductive and Antistatic Properties To Pomentioning

confidence: 99%

Electrical Properties of Polyesters

Urbaniak–Domagała¹

2019

Electrical and Electronic Properties of Materials

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Polyesters occupy an important place in the group of polymers as engineering materials to be used in electrotechnology and electronics. These polymers are characterized by excellent electro-insulating properties, showing mechanical strength, thermal resistance, and easiness in processing at the same time. The chapter presents the behavior analysis of the following polyesters in electric field: poly(ethylene terephthalate), poly(lactic acid), and polycarbonate. The effect of polymer microstructure on electric properties is presented, including its susceptibility to polarization that makes it possible to use polyesters as electrets materials. The second trend of the study presents the possibilities of transforming the electro-insulating properties of polyester fabrics to conductive properties with the use of modern processing methods such as PVD, CVD, and digital print. The functionalization of polyester fabrics extends their application range, for example, in e-textiles and reduces the fabric susceptibility to static electricity, increasing the safety of use.

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Crystallization kinetics and morphology of melt spun poly(ethylene terephthalate) nanocomposite fibers

Cited by 12 publications

References 32 publications

Investigation of the morphology of polypropylene − nanoclay nanocomposites

Investigation of the morphology of polypropylene − nanoclay nanocomposites

Polymer adhesion in heat‐treated nonwovens

Electrical Properties of Polyesters

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