Fabrication of well-miscible and highly enhanced polyethylene/ultrahigh molecular weight polyethylene blends by facile construction of interfacial intermolecular entanglement

Wu, Buyong; Cai, Yuanli; Zhao, Xiaowen; Ye, Lin

doi:10.1016/j.polymertesting.2020.106973

Cited by 21 publications

(20 citation statements)

References 27 publications

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“…The characteristic absorption peaks of UHMWPE resembled those of the neat PE sample, while the corresponding absorption peak intensity was obviously higher than that of neat PE. The intensity variation of the band at 1130.0 cm –1 attributed to the −C–C– skeleton was used to distinguish the UHMWPE phase from the PE matrix for mapping analysis, , while the color scale represented the corresponding phase distribution of neat PE (marked by a blue region), UHMWPE (marked by a red region), and interfacial transition area of the two phases (marked by a gradient color region from cyan to green and yellow) (Figure b). For the PE/UHMWPE sample (Figure d), the mapping image exhibited an obvious phase separation structure, and the UHMWPE domains with large size were distributed in PE domains with poor miscibility.…”

Section: Resultsmentioning

confidence: 99%

“…Figure a showed the storage modulus ( E ) versus temperature of the PE- g -GMA/UHMWPE- g -AA sample. A broad rubbery plateau can be observed for the sample due to the massive molecular entanglement of the UHMWPE phase, and the molecular chain interdiffusion and entanglements of the blends could be studied by means of performing tensile tests above the melting point. , Figure b shows stress–strain curves of PE samples at a tensile temperature of 150 °C, and the tensile properties are listed in Table . No strain hardening occurred for all samples.…”

Section: Resultsmentioning

confidence: 99%

“…The phase distribution of PE blends was investigated with a Renishaw inVia Reflex Raman spectrometer (UK) over the range of 400–1600 cm –1 . The morphology of fractured surfaces and worn surfaces was observed with a JEOL JSM-5900LV SEM (Japan), , while 3D topography of worn surfaces was detected with a VHX-1000E 3D microscope (Japan) . DMA of PE blends was conducted with a TA Instruments Q800 DMA (USA), using tension mode with a heating rate of 1 °C/min and a frequency of 1 Hz.…”

Section: Methodsmentioning

confidence: 99%

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Tailored Bonded Interfacial Intermolecular Entanglement of Polyethylene/Ultrahigh-Molecular-Weight Polyethylene Blends: Enhancing Miscibility, Reinforcement, and Friction Reduction

Cai

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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For achieving a well-miscible and highly enhanced polyethylene/ultrahigh-molecular-weight polyethylene (PE/UHMWPE) blend, which is an important blend for polyolefin materials with wide applications, tailored bonded interfacial intermolecular entanglement between the two phases was innovatively constructed via a facile reactive melt process through reaction between epoxy and carboxyl groups grafted onto polymer chains. The UHMWPE phase with obvious decreasing size and distribution was tightly embedded in a PE matrix, and the interfacial transition area increased dramatically, leading to forming a homogeneous and miscible blend. Meanwhile, the viscoelasticity and molecular entanglement density were improved remarkably, indicating an enhanced interfacial intermolecular diffusion, and a tight and robust dual network structure with covalent linkage and intermolecular entanglements was constructed in the blend. Obvious deformation with regular striation and many pulling-out UHMWPE fibrils were observed on an impact-fractured surface, and mechanical strength/toughness of the blend was remarkably enhanced. Furthermore, the wear rate and the friction coefficient were reduced significantly, and the worn surface presented smooth and flat features, confirming highly improved mechanical and tribological properties of the blend. This work provided a facile method to fabricate an enhanced PE/UHMWPE blend with application potential.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Tailored Bonded Interfacial Intermolecular Entanglement of Polyethylene/Ultrahigh-Molecular-Weight Polyethylene Blends: Enhancing Miscibility, Reinforcement, and Friction Reduction

Cai

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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“…According to the elastic theory of rubber, the density of entanglement network can be characterized by the modulus of rubber platform when the system reaches thermodynamic equilibrium, and the influence of crystal structure has been eliminated in this time. In this study, the rubber platform area exists in temperature range of 160-200 C, and Equations ( 14) and ( 15) 24,[35][36][37][38][39][40] are often used to evaluate the entanglement molecular weight (M e ) and entanglement density (v e ) of UHMWPE. The entanglement molecular weight (M e ) refers to the average molecular weight between two entanglement nodes in UHMWPE chains.…”

Section: Entanglement Dilutionmentioning

confidence: 99%

Regulating the dissolving system of ultra‐high molecular weight polyethylene to enhance the high‐strength and high‐modulus properties of resultant fibers

Wang

Song

et al. 2022

J of Applied Polymer Sci

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The molecular weight loss of ultra‐high molecular weight polyethylene (UHMWPE) fibers is extremely serious in comparison with raw materials due to the high temperature and strong shearing during dissolving process. In this study, decalin was introduced as preswelling solvent and the dissolving system was regulated to improve the solubility of UHMWPE in paraffin oil without severe degradation so as to prepare UHMWPE fibers with high molecular weight retention and low entanglement. UHMWPE was preswelling in decalin with different content, the mass ratio of decalin to UHMWPE were 1:1, 1.5:1, 2:1, 2.5:1, and 3:1. All UHMWPE fibers were prepared by gel‐spinning and hot‐drawing. UHMWPE fibers possess the highest molecular weight after preswelling of UHMWPE in decalin (with a mass ratio of 3:1 to UHMWPE, namely UPE/dec‐s‐3 sample). What's more, the entanglement of UHMWPE fibers gained from UPE/dec‐s‐3 sample has been observably diluted in comparation to that from UPE‐neat and other swollen samples. More importantly, the tensile strength and modulus of UHMWPE fibers obtained from UPE/dec‐s‐3 sample can reach 31.41 and 1446.26 cN/dtex, increased by 15.1% and 14.3% compared with UPE‐neat fibers, respectively. Besides, the thermal and crystallization behavior of UHMWPE fibers prepared from swollen UHMWPE have also been boosted.

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“…Polyethylene (PE) pipes have been widely used for transporting natural gas and water due to comprehensive advantages, such as low cost, long-term durability against environmental factors, easy installation, excellent corrosion resistance and so on. [1][2][3][4][5] With the significant increase of the transporting distance and pressure in practical fluid supply processes, the requirement of the pressure resistance for PE pipes becomes more significant. 6 In industry, the most common way to improve the mechanical strength and pressure resistance of PE pipe is chemical modification of its molecular structure.…”

Section: Introductionmentioning

confidence: 99%

Formation and reinforcing effect of epitaxial oriented crystallization of polyethylene induced by self‐assembly nucleating agent under stress

Kong

Cai

et al. 2021

Polymer International

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A rare earth nucleating agent (RENA) was introduced to fabricate polyethylene (PE) pipe resin, which self‐assembled into various structures in PE melt during processing and further induced PE molecules to epitaxially crystallize on its surface to form, among others, a hybrid shish‐kebab crystalline structure due to good crystallographic matching between RENA and PE. Under stress, the shish structure formed by needle‐like RENA assembly arranged preferentially along the drawing direction, which was beneficial for an orderly arrangement of PE chains epitaxially crystallizing on its surface in the process of stress‐induced recrystallization and thus promoted the formation of a dense oriented crystalline structure with a large number of shish structures, resulting in higher degree of crystallinity and orientation, and lower long period and lateral size of lamellae than those of PE sample. By orientation, compared with PE sample at the same draw ratio, PE‐RENA samples showed much higher tensile strength and modulus. Especially, the oriented PE‐RENA pipes showed an approximately 96% and 100% increase in tensile strength along the hoop direction and internal pressure resistance, respectively, compared with unoriented pipe sample. This work provides a facile method for fabricating highly enhanced PE pipes with wide application prospects. © 2021 Society of Industrial Chemistry.

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Fabrication of well-miscible and highly enhanced polyethylene/ultrahigh molecular weight polyethylene blends by facile construction of interfacial intermolecular entanglement

Cited by 21 publications

References 27 publications

Tailored Bonded Interfacial Intermolecular Entanglement of Polyethylene/Ultrahigh-Molecular-Weight Polyethylene Blends: Enhancing Miscibility, Reinforcement, and Friction Reduction

Tailored Bonded Interfacial Intermolecular Entanglement of Polyethylene/Ultrahigh-Molecular-Weight Polyethylene Blends: Enhancing Miscibility, Reinforcement, and Friction Reduction

Regulating the dissolving system of ultra‐high molecular weight polyethylene to enhance the high‐strength and high‐modulus properties of resultant fibers

Formation and reinforcing effect of epitaxial oriented crystallization of polyethylene induced by self‐assembly nucleating agent under stress

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