Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. II. Microstructure investigation

Lei, Jun; Jiang, Chaodong; Shen, Kaizhi

doi:10.1002/app.20639

Cited by 13 publications

(12 citation statements)

References 9 publications

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“…Due to the features of sensitive response to shear flow and high flexibility in crystallization, for polyolefin chains both approaches of SCORIM and VAIM can efficiently produce shishkebab superstructure in the molded bars of single component polyolefin [90][91][92][93]. Although shear flow has been exerted on the melt via SCORIM approach, AFM micrographs acquired at different regions of the molded bar of polybutene-1, exhibited that interlocking shish-kebab morphology formed at the shear region whereas the crystals were isotropic spherulites in the core region [91].…”

Section: Shish-kebab Generated From the Single Component Melt Of Polymentioning

confidence: 99%

Shish–kebab of polyolefin by “melt manipulation” strategy in injection-molding: A convenience pathway from fundament to application

Wang

Chen

Zhang

et al. 2008

Polymer

105

100

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a b s t r a c tDue to both theoretical and practical importance, the formation mechanism of shear-induced shishkebab and the precise microstructure and molecular composition in shish-kebab have been extensively investigated for many years. However, a systematic review on the manipulation of shish-kebab superstructure in the injection-molded specimens, taken account of combining theoretical understanding, preparation processing, structural/morphological control and macroscopic properties, has rarely seen in the open publication by far. In this article, we will discuss mainly the topic of formation of fine polyolefin shish-kebab superstructure facilitated by ''melt manipulation'' strategy in injection-molding process. The main body of this review is governed by a logical sequence of (fundamental research)-(injection molding of melt manipulation)-(manipulation of shish-kebab)-(macroscopic mechanical properties). The fundamental understandings of the early stage of shish-kebab crystallization, transition process from random entangled chains network to stable shish-kebab cylindrulite, and the role of long polymer chains on shish-kebab formation, are very helpful for in-depth comprehension of shear-induced shishkebab in realistic processing. Various highly oriented morphologies with fine shish-kebab superstructure in injection-molded bars of polyolefin melts, including single component polyolefin melt, biphase melts of blend and heterogeneous melts of polyolefin/inorganic filler composites, could be achieved via ''melt manipulation'' strategy, as demonstrated by the work mainly from our group.

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Section: Shish-kebab Generated From the Single Component Melt Of Polymentioning

confidence: 99%

Shish–kebab of polyolefin by “melt manipulation” strategy in injection-molding: A convenience pathway from fundament to application

Wang

Chen

Zhang

et al. 2008

Polymer

105

100

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“…From 2D‐WAXD and 1D‐WAXD patterns and results listed in Table , the intensity of diffraction peak (110) increased with mandrel rotation, implying the improved orientation of crystal plane (110) under circumferential stress . Furthermore, the average crystal size of the film at high mandrel speed was slightly larger than at low rotational speed.…”

Section: Resultsmentioning

confidence: 96%

A novel method for industrial manufacturing of thermoplastic multilayer films: Processing, microstructure, and properties

Luo

2018

Polymer Engineering & Sci

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This article reports a facile approach for industrial‐scale manufacturing of multilayer coextrusion‐blown films by developing a novel rotation homogenization distribution (RHD) method. Materials in this unique process are subjected to a flow field combining both shear circulation and pressure flow. In RHD, circumferential shear causes a laminar flow, where the stable interface between layers can be obtained, and assigns melt evenly to the entire circumferential direction. This equipment has been used to prepare multilayer low‐density polyethylene (LDPE) films under various shear rates by altering the mandrel rotation speed. The effects of mandrel rotation speed on the microstructure, morphology, and properties of bilayer LDPE films were investigated. Multilayer LDPE films with superior interfacial stability and uniform layer distribution, which differ from the multiple melt channels in conventional multilayer coextrusion blown facilities, were successfully fabricated using the proposed equipment. Evident enhancements were observed in thermal shrinkage and mechanical properties of the multilayer films, especially in the transverse direction. © 2018 Society of Plastics Engineers POLYM. ENG. SCI., 59:E339–E349, 2019. © 2018 Society of Plastics Engineers

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“…Jun et al [7] used the DPIM device to prepare biaxially self-reinforced HDPE under the vibration in one direction, obtaining a 42% increase of the tensile strength in both MD and TD. The morphology [8] indicated that the biaxial self-reinforcement of HDPE was mainly due to the existence of an interlocking shish kebab morphology, along with the preferred orientation of the lamellae and the increased crystallinity.…”

Section: Introductionmentioning

confidence: 98%

Biaxially Self-Reinforced High-Density Polyethylene Prepared by Vibration-Assisted Injection Molding. I. Processing Conditions and Physical Properties

Shen

2014

Journal of Macromolecular Science, Part B

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A pulse pressure was imposed on the melt in the injection molding cavity during the injection and holding pressure stages, called vibration-assisted injection molding (VAIM) technology. With the VAIM technology, biaxially self-reinforced high-density polyethylene (HDPE) samples were prepared and the physical properties affected by the vibration processing conditions were studied. The tensile properties can be improved in both the machine direction (MD) and the transverse direction (TD) by changing the vibration frequency and vibration pressure amplitude, respectively. The elongation at break increased with increasing the vibration frequency for the VAIM sample processed at constant low vibration pressure amplitude; the yield strength increased with increasing the vibration pressure amplitude for the VAIM sample prepared at constant low vibration frequency. The softening point temperature for the VAIM sample increased by 8 • C compared with a conventional injection-molded (CIM) sample.

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Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. II. Microstructure investigation

Cited by 13 publications

References 9 publications

Shish–kebab of polyolefin by “melt manipulation” strategy in injection-molding: A convenience pathway from fundament to application

Shish–kebab of polyolefin by “melt manipulation” strategy in injection-molding: A convenience pathway from fundament to application

A novel method for industrial manufacturing of thermoplastic multilayer films: Processing, microstructure, and properties

Biaxially Self-Reinforced High-Density Polyethylene Prepared by Vibration-Assisted Injection Molding. I. Processing Conditions and Physical Properties

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