In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing

Xing, Qiang; Zhu, Meifang; Wang, Yiheng; Chen, Yanmo; Zhang, Yu; Pionteck, Jürgen; Adler, Hans-Jürgen P.

doi:10.1016/j.polymer.2005.03.100

Cited by 40 publications

(43 citation statements)

References 45 publications

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“…Xing et al also conducted spinning process and an amount of 4 wt% of PS was reported as the critical value for evolving a fibrillar morphology. Under this value, an elliptical shape of dispersed phase with a diameter of about 200 nm was observed and fibrils with diameters of about 50–70 nm were formed in the amounts above 8 wt% .…”

Section: Introductionmentioning

confidence: 92%

Investigation of rheology and morphology to follow physical fibrillar network evolution through fiber spinning of PP/PA6 blend fiber

Hajiraissi

Jahani

Hallmann

2017

Polymer Engineering & Sci

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This work is aimed at investigating the influence of fibrillar morphology of deformed Polyamide 6 (PA6) droplets dispersed in Polypropylene (PP) matrix on the melt viscoelastic behavior of their blends. The blends of PP with various amounts of PA6 (1%, 6%, 10%, and 20%) were prepared by melt mixing in a co‐rotating twin screw extruder and fibrillated by fiber spinning process. Scanning Electron Microscopy revealed that the PA6 spherical droplets form fibrillar inclusions after fiber spinning. The steady and transient shear rheological responses of samples were evaluated in both linear and nonlinear ranges of deformation. Non‐terminal behavior of storage modulus at low frequency appeared as a typical characteristic of fibrillar morphology whose width and value depend on fibril growth. Storage modulus and complex viscosity of the blends containing PA6 fibrillated structure were remarkably enhanced compared to as‐extruded samples. The fibrillar‐induced elasticity of the fibers is a distinguishable behavior which was revealed by conducting transient stress and creep‐recovery measurements and upon appearing mature fibrils, elasticity of the polymer blend fibers increased significantly. POLYM. ENG. SCI., 58:1251–1260, 2018. © 2017 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 92%

Investigation of rheology and morphology to follow physical fibrillar network evolution through fiber spinning of PP/PA6 blend fiber

Hajiraissi

Jahani

Hallmann

2017

Polymer Engineering & Sci

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“…As was observed by SEM, the fiber system with 1 wt% of PTT showed two different trends of fibrillation. Here, it may be deduced that temperature plays a crucial role in fibrillation threshold which can be seen that fibrillation shifts to 1 wt% of PTT in the fiber spun at 240 °C, which is not the case in previous works conducted at temperature below the T m of dispersed phase 30,39,45,47. According to the reported works, since viscosity ratio and processing conditions are under control of disperse‐phase ratio and temperature respectively, the fibrillation of each polymer blend system is also dependent, whose dependent fibrillation appears by forming fibrils with different lengths 2,14,18,28,30,31,36,38,47,51…”

Section: Resultsmentioning

confidence: 88%

“…Fiber spinning as a potent method to impose the highest amount of elongational field makes the dispersed phase experience the highest elongational field to be transferred into elongated morphology. Although it has been observed that low amount of dispersed phase (129 and 6 wt%45) (due to high interfacial stress) is incapable of being elongated, increasing the processing temperature enables the PTT droplet to be fibrillated even at 1 wt% of PTT, which did not represent a suitable fibrillar morphology29 at spinning temperature of 195 °C (Figure 6a at 240 ° C ). As is seen in Figure a, upon increasing the fibril diameter (proved by SEM), the fiber shows higher modulus.…”

Section: Resultsmentioning

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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“…Most clay platelets were exfoliated in the last polar polymer phase and PA6 fibrils formed (25) The nano-scale dispersed fibrils with gradient distribution in PP/PS blend fine fibers were observed by in situ formation during its melt spinning process. This study of the relationship between morphology and processing can provide a guide line for the design, research and development of polymer nanocomposite fiber (26).…”

Section: Thermoplastic-thermoplastic Polymer Blend Nanocompositesmentioning

confidence: 99%

Polyblend Nanocomposites

Feldman¹

2015

Journal of Macromolecular Science, Part A

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Blending polymers is used to obtain products with improved and wider range of properties. A polymer blend or polyblend is a microscopically mixture of two or more polymers. This paper deals with polyblend nanocomposites where one of the components has at least one dimension of the order of nanometer. It covers different groups of nanocomposites depending on the type of the polymer used in such mixtures, mainly:thermoplastic -thermoplastic polymer blend nanocomposites, thermoplastic -thermoset polymer blend nanocomposites, thermoplastic -elastomer polymer blend nanocomposites, biodegradable polymer blend nanocomposites.

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In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing

Cited by 40 publications

References 45 publications

Investigation of rheology and morphology to follow physical fibrillar network evolution through fiber spinning of PP/PA6 blend fiber

Investigation of rheology and morphology to follow physical fibrillar network evolution through fiber spinning of PP/PA6 blend fiber

An Insight into Phenomenology of Polytrimethylene Terephthalate Fibrillation

Polyblend Nanocomposites

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