Fabrication of Polypropylene/Poly (Trimethylene Terephthalate) Blend Fibers with Highly Improved Resiliency and Preserved Mechanical Properties

The present study has addressed the effects of nanoclay on the properties of polypropylene (PP)/polybutylene terephthalate (PBT) blend fibers such as their dyeability and, rheological and resiliency behaviors which are produced by melt spinning. The results of the differential scanning calorimetry (DSC) analysis indicated that the presence of both nanoclay and PBT significantly influenced the crystallinity of PP which also confirmed their nucleating effects on the nanocomposite fibers. Compared to neat PP fibers, the incorporation of 0.5–1wt.% of nanoclay and 10 wt.% of PBT nanocomposite fibers caused approximately 23% and 52% enhancements in the resiliency and dye uptake respectively without using toxic carriers. The rheological analysis was carried out for investigating the viscoelastic behavior, and microstructural and dispersion of nanoclay in the nanocomposite fibers. The rheological behavior in the small amplitude oscillatory shear (SAOS) test demonstrated the percolation threshold network of the structure of PBT fibrils in the PP matrix. When the PBT domains are fibrillated, the storage modulus (G′) and complex viscosity increase compared to neat PP. Also, the nonterminal behavior at low frequencies indicates the uniform dispersion of nanoclay in fiber nanocomposites. These all cause the improvement of the melt strength of the PP matrix. Transmission electron microscopy (TEM) was used to study the dispersion and localization of nanoclay. Nanoclay has also played a compatibilizing role in the immisible PP/PBT blend and was localized mainly in the PBT disperse and interface, and therefore prevented coalescence. The role of the compatibility of nanoparticles is to decrease the mean diameter of the nano-fibrils to 75 nm, for the hot-drawn nanocomposite fibers, as measured by scanning electron microscopy (SEM). All of the above lead to increasing the melt strength and elasticity of the nanocomposites in the fiber spinning process.

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“…Although this method is old, it has been a common method for calculating the resiliency behavior and has been used in many new articles. 53,54…”

Section: Resultsmentioning

confidence: 99%

Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

Seraji

Bajgholi

2022

Journal of Industrial Textiles

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“…However, the library of fibrillar technology lacks complementary information about influence of processing temperature on fibril structure and its respective diameter and length can definitely help engineers to manipulate more precise morphologies. Since the viscosity is under the control of temperature, by changing the processing temperature and the amount/type of shear field (in the extruder,21,22 at die3,8,16), droplet deformation behavior varies leading to fibrils with different diameters and lengths. Using the fiber spinning process, Fakirov et al showed that the diameters of polyethylene terephthalate (PET) in polypropylene (PP) matrix reduced to 150 nm 18.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, it was documented that the fabrication of a polymer blend in which the dispersed phase is transferred into an elongated structure (fibrillation mechanism) requires three sequential steps: i) blending two incompatible polymers with different melting temperatures, ii) fibrillation at processing temperatures below the melting temperature ( T m ) of the dispersed phase and higher than that of the matrix, iii) isotropization at a temperature higher and lower than the matrix and dispersed phase, respectively. Applying fibrillar reinforced composites has drawn the attention of many industries such as textile, automotive, and construction in which better dyeability of polymer fibers,11 less solvent and oxygen permeability,10,12,13 and improved mechanical properties4,14–16 may be the advantages of fibrillar polymer composites over the traditional ones, along with partitioning nanofillers to fabricate nanosensors with final application in the electronic industry 17…”

Section: Introductionmentioning

confidence: 99%

An Insight into Phenomenology of Polytrimethylene Terephthalate Fibrillation

Hajiraissi

2020

Macro Materials & Eng

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The objective of this work is to analyze the effect of the processing temperature on fibrillation of the dispersed phase and to correlate melt viscoelastic responses to formed morphologies. A blend system of polypropylene (PP)/polytrimethylene terephthalate (PTT) with varying ratios (PP/PTT: 99/1, 94/6, 90/10, and 80/20) is prepared on a co‐rotating twin screw extruder, and then pelletized blend samples are fed into a laboratory mixing extruder to spin monofilaments at three different orifice temperatures of 180, 195, and 240 °C. As revealed by scanning electron microscopy, a nano‐fibrillar morphology forms after employing spinning. Rheological approach performed in the linear region shows a transition from terminal trend into non‐terminal trend in the low‐frequency region when the fibrillar morphology forms, the magnitude and width of which are reflective of the fibril growth. Transient stress measurements prove its capability to enable the blend system to show potentials of morphology development during dynamic tests. Startup of steady shear flow shows that after reaching the percolation concentration of dispersed phase, fibril–fibril coalescence leads to the formation of long fibrils whose contribution to the blend system increases the elasticity of the blend fibers.

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Linear and nonlinear melt viscoelastic properties of fibrillated blend fiber based on polypropylene/polytrimethylene terephthalate

Hajiraissi

2019

Polym. Bull.

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Fabrication of Polypropylene/Poly (Trimethylene Terephthalate) Blend Fibers with Highly Improved Resiliency and Preserved Mechanical Properties

Cited by 7 publications

References 41 publications

Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites

An Insight into Phenomenology of Polytrimethylene Terephthalate Fibrillation

Linear and nonlinear melt viscoelastic properties of fibrillated blend fiber based on polypropylene/polytrimethylene terephthalate

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