Correlation between isothermal crystallization properties and slow crack growth resistance of polyethylene pipe materials

Gholami, Farzad; Pircheraghi, Gholamreza; Rashedi, Reza; Sepahi, Abdulhanan

doi:10.1016/j.polymertesting.2019.106128

Cited by 28 publications

(15 citation statements)

References 32 publications

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“…12,13 There are diverse publications concerning the effect of different parameters on the resistance to SCG. 1,[14][15][16][17][18][19] Deveci et al studied the effects of different molecular structure parameters on the SCG resistance of ethylene/1-butene and ethylene/1-hexene resins. They fully characterized a wide range of industrially available PE100 resins and revealed the effect of the molecular structure on the SCG resistance of the resins.…”

Section: Introductionmentioning

confidence: 99%

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Effects of polymerization parameters on the slow crack growth resistance and rheological properties of bimodal polyethylene resins

Jandaghian

Maddah

Sepahi³

et al. 2021

J of Applied Polymer Sci

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In this paper, using a comprehensive study, we have investigated the effect of various polymerization parameters during the synthesis of bimodal polyethylene resins on their rheological and mechanical properties. Bimodal polyethylene resins were synthesized in two subsequent stages in a lab-scale reactor by manipulating a set of parameters such as C 2 /H 2 ratios in the first and second stages, the split value, and the comonomer type. The results showed that the comonomer type and C 2 /H 2 ratio of the second stage of the polymerization are the most critical parameters that control the final resins' slow crack growth resistance properties. On the other hand, the shear-thinning behavior of the resins is mainly controlled by the first-stage polymers. Although the C 2 /H 2 ratio of the first stage results in a moderate effect on the rheological properties of the final resins, its split value governs the flow characteristics of the final molten polymers under high shear rates.

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Section: Introductionmentioning

confidence: 99%

“…They claimed that more ordered and larger spherulites, produced by a lower rate of crystallization, result in a lower SCG resistance. 16 Yang et al had a different idea. They compared different grades of PE100 and PE100RC and they found in all cases, the PE100RC grades with larger crystals, have higher SCG resistance.…”

Section: Introductionmentioning

confidence: 99%

Effects of polymerization parameters on the slow crack growth resistance and rheological properties of bimodal polyethylene resins

Jandaghian

Maddah

Sepahi³

et al. 2021

J of Applied Polymer Sci

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“…The SHM was considered the slope of the true stress versus (λ 2 − 1/λ) curve. [37][38][39][40][41] The rheological properties of the samples were investigated using a parallel plates Anton Paar (MCR 205®) rheometer. Small amplitude oscillatory share (SAOS) tests in the linear viscoelastic region were used to determine storage and loss modulus.…”

Section: Characterizationmentioning

confidence: 99%

Demystifying the two-sided role of inorganic halides in the structure and performance of Ziegler–Natta catalysts

Jandaghian

Maddah

Hosseini³

et al. 2022

Mol. Syst. Des. Eng.

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“…PE100 is the third generation of pipe grade high-density polyethylene (HDPE) and has an optimum balance of long-term strength, creep resistance, and slow crack growth resistance. PE100 pipes have been widely used in water and gas supply networks [ 1 , 2 , 3 ]. It is well recognized that HDPE exhibits viscoelastic–plastic behavior at room temperature, and its stress–strain response is strongly affected by the loading rate [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material

Luo

et al. 2022

Polymers

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It is not conservative to directly use the strength tested under the laboratory loading rates to evaluate the long-term creep strength of polymers. A suitable strain rate-dependent constitutive model is crucial for accurately predicting the long-term strength and mechanical behavior of polymer pressure pipes. In this study, the Kondner hyperbolic constitutive model is considered the base model in deriving the rate-dependent constitutive model for PE100 pipe material, and the yield stress and initial tangent modulus are the two rate-dependent parameters of the model. Uniaxial tension tests are carried out under five specified strain rates ranging from 10−5 s−1 to 5 × 10−2 s−1 to obtain these two parameters. It is demonstrated that the strain rate dependence of the yield stress and the initial tangent modulus can be described by either a power or a logarithm law. The predictions from the two models are in good agreement with the experiments. In contrast, the power-law rate-dependent Kondner model is more suitable for describing the rate-dependent tensile behavior of PE100 pipe material than the logarithm-law rate-dependent Kondner model, especially for the cases of very low strain rates which relate to the polymer pressure pipe applications.

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Correlation between isothermal crystallization properties and slow crack growth resistance of polyethylene pipe materials

Cited by 28 publications

References 32 publications

Effects of polymerization parameters on the slow crack growth resistance and rheological properties of bimodal polyethylene resins

Effects of polymerization parameters on the slow crack growth resistance and rheological properties of bimodal polyethylene resins

Demystifying the two-sided role of inorganic halides in the structure and performance of Ziegler–Natta catalysts

Strain Rate-Dependent Hyperbolic Constitutive Model for Tensile Behavior of PE100 Pipe Material

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