In-situ visualization of polypropylene crystallization during extrusion

Tabatabaei, Alireza; Barzegari, Mohamad Reza; Nofar, Mohammadreza; Park, Chul

doi:10.1016/j.polymertesting.2013.10.017

Cited by 25 publications

(15 citation statements)

References 33 publications

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“…During compression molding, the molecular orientation of UHMWPE induces nucleation. As nucleation increases, the spherulite size decreases . The decreased spherulite size improves the elongation at break.…”

Section: Resultsmentioning

confidence: 99%

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Feng

Chen

et al. 2019

Polymer International

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Low processing efficiency and fusion defects limit the application of ultra‐high molecular weight polyethylene (UHMWPE) in artificial joint implants. These problems result from the high melt viscosity of UHMWPE. Here, we use an eccentric rotor extruder (ERE) based on elongational flow to pretreat UHMWPE. Compression molded UHMWPE is obtained without and with ERE pretreatment (EP‐UHMWPE). The processing efficiency of EP‐UHMWPE is improved compared with direct compression molded UHMWPE. This is because the preheating time can be omitted during the molding process, and the residence time of UHMWPE in the extruder is less than 90 s. The mechanical properties and friction resistance of EP‐UHMWPE are significantly improved compared with those of direct compression molded UHMWPE. The yield strength increases from 21 MPa to 23 MPa, the tensile strength increases from 36 MPa to 46 MPa, the elongation at break increases from 610% to 700%, and the abrasion loss decreases from 1.73 mg/1000 r to 0.93 mg/1000 r when UHMWPE is subjected to ERE pretreatment. We attribute these improvements to the elongational flow enhancing the orientation and disentanglement of UHMWPE molecular chains, which in turn improves particle fusion. The molecular weight is well maintained when subjected to ERE pretreatment. UHMWPE components pretreated by ERE have good prospects in artificial joint implants. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Feng

Chen

et al. 2019

Polymer International

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“…It should be noted that both MPET-1 and FPET have good melt strength to support extrusion foaming, but their crystallization rates are significantly different. Tabatabaei et al [52][53][54] investigated polymer strain-induced crystallization under the influence of scCO 2 in extrusion adopting mold visualization apparatus. It was observed that polymer crystallites were quickly formed inside the die at a temperature even above the melting temperature (T m ).…”

Section: Foaming Behavior Using Co 2 As Blowing Agentmentioning

confidence: 99%

Good extrusion foaming performance of long‐chain branched PET induced by its enhanced crystallization property

Yao

Guo

Liu

et al. 2020

J of Applied Polymer Sci

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Poly(ethylene terephthalate) (PET) was modified by regulating different contents of branching agent epoxy‐based multifunctional oligomer and chain extender pyromellitic dianhydride in reactive extrusion process. The modified PET with better long‐chain branched (LCB) structure boosted its rheological properties, and its enhancement of melt viscoelasticity resulted in excellent foamability in molten‐state foaming process using supercritical CO2 as blowing agent. More importantly, the branched structures acted as crystal sites to accelerate the crystallization kinetic of LCB PET whether under atmospheric pressure or high‐pressure CO2. The shear and elongation flow inside die further quickly induced the crystallization of LCB PET. The rapidly generated fine crystals could both introduce heterogeneous cell nucleation and suppress CO2 escape, so the cell morphology of LCB PET in continuous extrusion foaming process exhibited a three‐fold increase in cell density and smaller uniform cell size with respect to those of other foam‐grade PET with long‐chain structure.

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“…Another example of new polymer materials in need of detailed investigations are semi‐crystalline polymers. As discussed by Tabatabaei et al [TBNP14] the properties and morphology of semi‐crystalline polymers need to be continuously analyzed during the crystallization process in order to reach the targeted application properties, which are mainly defined by the crystallite structures. In general, polymers are found in important material systems for future applications.…”

Section: Visual Computing In Materials Sciencementioning

confidence: 99%

STAR: Visual Computing in Materials Science

Heinzl

Stappen

2017

Computer Graphics Forum

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Visual computing has become highly attractive for boosting research endeavors in the materials science domain. Using visual computing, a multitude of different phenomena may now be studied, at various scales, dimensions, or using different modalities. This was simply impossible before. Visual computing techniques provide novel insights in order to understand complex material systems of interest, which is demonstrated by strongly rising number of new approaches, publishing new techniques for materials analysis and simulation. Outlining the proximity of materials science and visual computing, this state of the art report focuses on the intersection of both domains in order to guide research endeavors in this field. We provide a systematic survey on the close interrelations of both fields as well as how they profit from each other. Analyzing the existing body of literature, we review the domain of visual computing supported materials science, starting with the definition of materials science as well as material systems for which visual computing is frequently used. Major tasks for visual computing, visual analysis and visualization in materials sciences are identified, as well as simulation and testing techniques, which are providing the data for the respective analyses. We reviewed the input data characteristics and the direct and derived outputs, the visualization techniques and visual metaphors used, as well as the interactions and analysis workflows employed. All our findings are finally integrated in a cumulative matrix, giving insights about the different interrelations of both domains. We conclude our report with the identification of open high level and low level challenges for future research.

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In-situ visualization of polypropylene crystallization during extrusion

Cited by 25 publications

References 33 publications

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Good extrusion foaming performance of long‐chain branched PET induced by its enhanced crystallization property

STAR: Visual Computing in Materials Science

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