Polypropylene Blends: Properties Control by Design

Chow, W. S.

doi:10.1007/978-3-030-12903-3_8

Cited by 8 publications

(5 citation statements)

References 164 publications

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“…Furthermore, the cavity formed during extension was tiny, and the tie chains connecting the oriented fibrils were substantial. [208][209][210] Therefore, the stress transmission among these fibrils is homogeneous during transverse stretching and thus results in numerous channels between pores and the narrowest pore size distribution in the membranes.…”

Section: Deformation and Pore Formation Mechanism Of 𝛽 Nucleated Poly...mentioning

confidence: 99%

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Sharaf,

Kloczkowski

2023

Macro Chemistry & Physics

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Isotactic polypropylene (iPP) is a frequently used polymer in industrial processing and scientific research, used as a model material. This review highlights some current and forefront issues in polymer science and engineering. This review alludes to classical deformation schemes to interpret the complicated deformation in isotactic polypropylene as a semicrystalline polymer. Also, due to the complex hierarchical structures of crystallized polymers, we are concerned mainly with the progress on the multi‐scale and multi‐stage microstructural evolution covering each deformation stage from the initiation of plasticity until failure, particularly in terms of crystalline morphology changes. Specifically, the characterization of the microstructure evolution of a single spherulite, lamella, and chain of isotactic polypropylene will be emphasized and mentioned. Here, we are most interested in the results obtained from stretching (strain‐induced) orientation and crystallization studies accompanied by the in situ scattering and spectroscopy techniques offering a detection window from nano to micrometer scale, which should be able to reflect the microstructural changes at different length scales of interest.During polymer processing, the melts are frequently subjected to shear or/and elongation flow fields, producing flow‐induced molecular chain orientation in the melt. The oriented molecular chains crystallize differently than those encountered under quiescent conditions. Thus, orientation‐induced crystallization has long been an object of intense interest. A vast body of research was reported about the effects of preorientation on the crystallization of various polymers. Among them, iPP is most frequently studied since its diversified structure and morphology are very sensitive to changes in processing conditions and molecular parameters.This article is protected by copyright. All rights reserved

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Section: Deformation and Pore Formation Mechanism Of 𝛽 Nucleated Poly...mentioning

confidence: 99%

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Sharaf,

Kloczkowski

2023

Macro Chemistry & Physics

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“…ξ 1 and ξ 2 are the recycling strengthening coefficient of strain rate. For the non-recycled materials, N is equal to zero, Equations ( 7) and (8) reduce to the same form of Equations ( 1) and (2).…”

Section: Recycling Effectmentioning

confidence: 99%

“…These materials have attractive mechanical properties, low density, excellent chemical resistance and effectiveness price [1]. For manufacturing car bumpers tolerant to high loading rate, elastomers such as ethylene-propylenecopolymer (EPC) and ethylene-propylene-diene-monomer (EPDM) are generally mixed with neat PP to improve the impact properties [2]. However, these rubber particles lead to a decrease of stiffness and strength of the materials.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Modeling of the Tensile Behavior of Recycled Polypropylene Based Composites

Wang

Peng

Boumbimba

et al. 2019

Preprint

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The effect of reprocessing on the quasi-static uniaxial tensile behavior of two commercial polypropylene (PP) based composites is experimentally investigated and modeled. In particular, the studied materials consist of an unfilled high-impact PP and a talc-filled high-impact PP. These PP composites are subjected to repeated processing cycles including a grinding step and an extrusion step to simulate recycling at the laboratory level, the selected reprocessing numbers for this study being 0, 3, 6, 9 and 12. Because the repeated reprocessing leads to thermo-mechanical degradation by chain scission mechanisms, the tensile behavior of the two materials exhibits a continuous decrease of elastic modulus and failure strain with increasing number of reprocessing. A physically consistent three-dimensional constitutive model is used to predict the tensile response of non-recycled materials with strain rate dependence. For the recycled materials, the reprocessing effect is accounted by incorporating the reprocessing sensitive coefficient into the constitutive model for Young’s modulus, failure strain, softening and hardening equations. Our predictions of true stress - true strain curves for non-recycled and recycled 108MF97 and 7510 are in a good agreement with experimental data.

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“…8 Polymer blending is an economically viable and versatile industrial approach of modifying selected properties of the existing polymers. 9 A thermoplastic blend is a common method used to produce PLA with desirable properties. Polypropylene (PP) offers outstanding chemical and moisture resistance, low density, good processability and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Antistatic and Thermal Properties of Poly(Lactic Acid)/Polypropylene/Carbon Nanotube Nanocomposites

Chow

Lim

2020

JES

Self Cite

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The aim of this study is to investigate the influence of carbon nanotubes (CNT) on the antistatic and thermal properties of poly(lactic acid)/polypropylene/carbon nanotubes (PLA/PP/CNT) nanocomposites. PLA/PP (blend ratio = 60:40) containing CNT (loading 1.0 to 2.5 phr) was melt-compounded followed by compression moulding. The antistatic properties of PLA/PP/CNT nanocomposites achieved at 2.5 phr CNT loading. Thermogravimetric analysis (TGA) results indicated that the thermal stability of PLA/PP/ CNT nanocomposite was higher than PLA/PP blend. Differential Scanning Calorimetry (DSC) results demonstrated that CNT reduced the cold crystallisation temperature of PLA, while increased the crystallisation temperature of PP, which evidenced the nucleatingability of CNT in the PLA/PP blends.

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Polypropylene Blends: Properties Control by Design

Cited by 8 publications

References 164 publications

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Evolution of the Deformation‐ and Flow‐Induced Crystallization and Characterization of the Microstructure of a Single Spherulite, Lamella, and Chain of Isotactic Polypropylene

Constitutive Modeling of the Tensile Behavior of Recycled Polypropylene Based Composites

Antistatic and Thermal Properties of Poly(Lactic Acid)/Polypropylene/Carbon Nanotube Nanocomposites

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