New insight into lamellar branching of β-nucleated isotactic polypropylene upon melt-stretching: WAXD and SAXS study

Liu, Zhongzhu; Liu, Xianhu; Zheng, Guoqiang; Dai, Kun; Liu, Chuntai; Shen, Changyu

doi:10.1007/s10853-014-8618-0

Cited by 26 publications

(26 citation statements)

References 29 publications

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Section: Introductionmentioning

confidence: 99%

“…The controlling and tailoring of crystalline morphologies, such as shish‐kebab, are significant for the physical properties of semicrystalline polymers . The mechanical strength as an example is strongly influenced by the degree of crystallinity and the bulk and surface morphology of the polymer . Shish‐kebab, as a highly oriented crystalline morphology, shows superior strength and modulus in comparison to other morphologies, providing the potential to fabricate self‐reinforced poly‐mer products .…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical strength as an example is strongly influenced by the degree of crystallinity and the bulk and surface morphology of the polymer . Shish‐kebab, as a highly oriented crystalline morphology, shows superior strength and modulus in comparison to other morphologies, providing the potential to fabricate self‐reinforced poly‐mer products . Therefore, the amount of shish‐kebabs in a polymer has become a decisive factor for the enhancement of physical properties of pure polymer products.…”

Section: Introductionmentioning

confidence: 99%

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An Alternating Skin–Core Structure in Melt Multi‐Injection‐Molded Polyethylene

Liu

Lian

Pan

et al. 2017

Macro Materials & Eng

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Shish‐kebab, which is endowed with superior strength and modulus, provides the potential to fabricate self‐reinforced polymer products. However, the injection‐molded product usually exhibits a typical skin–core structure, and the shish‐kebab is only located in an extremely thin shear layer. Therefore, the controlling and tailoring of crystal structures in complex flow field to improve the mechanical properties of the injection‐molded sample are still a great challenge. Herein, for the first time, high‐density polyethylene sample with a novel macroscopic alternating skin–core structure is achieved using a melt multi‐injection molding technique. Results show that, with increasing the amount of melt injection, the layers of skin–core structure increase in the form of arithmetic progression, and therefore the tensile strength of the samples progressively increases due to an increase of shish‐kebab content. This study demonstrates a new approach to achieve multilayer homogeneous materials with excellent tensile strength via macroscopic structural design during the practical molding process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Alternating Skin–Core Structure in Melt Multi‐Injection‐Molded Polyethylene

Liu

Lian

Pan

et al. 2017

Macro Materials & Eng

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“…The intensity of the (200) crystalline plane is plotted as a function of the azimuthal angle. For uniaxial oriented films, the set‐of‐plane typically followed is the (200) . The orientation value, f 200 , is calculated by the Hermans' orientation function:

f_{200} = \frac{3 ∙ \cos^{2} θ_{200} ∙ \overset{\sin^{2} φ_{200}}{true} - 1}{2}

…”

Section: Resultsmentioning

confidence: 99%

Effect of external field on the lamellar crystalline structure and properties of poly(4‐methyl‐1‐pentene) casting film

Zhao

et al. 2018

J of Applied Polymer Sci

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In this work, lamellae structures of poly(4‐methyl‐1‐pentene) casting films with different draw ratios and properties of corresponding stretched membranes were discussed. The crystalline structure was quantitatively analyzed in terms of crystallinity, long period, crystalline orientation, and lamellae lateral dimension, which were largely influenced by the draw ratio. Apparently, as draw ratio increased, the elapsed time of samples declined rapidly and porosity showed an upward tendency. In this article, these results can be used to predict the relationship between properties of casting films (such as orientation, lamellar structure, and elastic recovery) and properties of stretched membrane (average pore size, permeability, and porosity). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47293.

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“…It is well known that, in the injection molding process, polymer melt is subjected to an intricate thermo‐mechanical field characterized by fast cooling rate and severe stress field, and such a thermomechanical history in return does play an important role in the development of morphological features . The formation of orientation is a result of the competition between the flow induced orientation and its subsequent relaxation .…”

Section: Current Researchmentioning

confidence: 99%

Overview of the Experimental Trends in Water‐Assisted Injection Molding

Liu

Pan

Zheng

et al. 2018

Macro Materials & Eng

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In recent years, a new and promising polymer processing technology known as water‐assisted injection molding (WAIM) has attracted attention not only for academic reasons but also for its industrial applications. WAIM technology provides a new way to fabricate hollow or other complicated products due to its faster cycling time and light weight. This paper aims to give an overview of the basic principles and applications of WAIM as well as the current research status in academia. The origin and development of WAIM technology are first described and then, their advantages and applications are given. This review focuses on the experimental trends of WAIM such as computer simulation, the effect of processing parameters on the WAIM samples, and the morphology as well as related WAIM–molded composites and polymer blends' work.

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New insight into lamellar branching of β-nucleated isotactic polypropylene upon melt-stretching: WAXD and SAXS study

Cited by 26 publications

References 29 publications

An Alternating Skin–Core Structure in Melt Multi‐Injection‐Molded Polyethylene

An Alternating Skin–Core Structure in Melt Multi‐Injection‐Molded Polyethylene

Effect of external field on the lamellar crystalline structure and properties of poly(4‐methyl‐1‐pentene) casting film

Overview of the Experimental Trends in Water‐Assisted Injection Molding

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