Preparation of a Thermally Insulating Nanocomposite by Blending Ultra-High-Molecular-Weight Polyethylene with Gas-Phase Silica

Li, Jianxi; Zhang, Cong; Chen, Tao; Li, Linfan; Li, Jingye

doi:10.1021/acs.iecr.5b00020

Cited by 7 publications

(8 citation statements)

References 42 publications

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“…The collected powders were then dried in vacuum at 100 °C for 24 h to obtain a dry mixture. Then, the mixture was hot‐pressed at 220 °C for 0.5 h at 10 MPa and then cooled in air to room temperature to make a 1‐mm thick sheet for tensile and wear measurement . The sheet was called X‐UHMWPE/UHMWPE composite and a sketch is shown in Figure to describe the preparation procedure .…”

Section: Methodsmentioning

confidence: 99%

“…The morphology of the cross‐section of the composite was observed using a JEOL JSM‐6500F scanning electron microscope (SEM) with an acceleration voltage of 10 kV. Prior to the SEM observation, the cross‐section was obtained by quenching breakage in liquid nitrogen and a thin Au layer was coated to increase electrical conductivity . Mechanical properties such as tensile strength and elongation at break were obtained by using an Electromechanical Universal Testing Machine (ETM 5308) according to GB/T 1040.2‐2006/ISO 527‐2:1993 at room temperature and the tensile speed was set as 250 mm/min .…”

Section: Methodsmentioning

confidence: 99%

“…Mechanical properties such as tensile strength and elongation at break were obtained by using an Electromechanical Universal Testing Machine (ETM 5308) according to GB/T 1040.2‐2006/ISO 527‐2:1993 at room temperature and the tensile speed was set as 250 mm/min . Each specimen was measured ten times, the obtained data were the average value …”

Section: Methodsmentioning

confidence: 99%

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More wear‐resistant and ductile UHMWPE composite prepared by the addition of radiation crosslinked UHMWPE powder

Wang

Zhang

et al. 2016

J of Applied Polymer Sci

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Radiation crosslinked ultrahigh molecular weight polyethylene (X-UHMWPE) powder was prepared by g-ray irradiation under nitrogen atmosphere with a dose of 50-200 kGy at a dose rate of 7 kGy/h and further annealing in vacuum at 120 8C for 4 h. The crosslinked powder was characterized by FT-IR spectroscopy, gel content, and hot-press molding. Then, X-UHMWPE was added to pristine UHMWPE to prepare a composite with 0-25 wt % filler. The morphology, wear resistance, and tensile property of the composite were investigated. Using X-UHMWPE as a filler could sufficiently improve the wear resistance of the composite. Adding 25 wt % X-UHMWPE (dose: 150 kGy) improved wear resistance by 130% and retained approximately 90% tensile strength and 70% ductility. Wear-resistant and ductile UHMWPE composite may be potentially used for artificial joint replacement and engineering devices. The proposed route is useful in fabricating UHMWPE material with excellent comprehensive performance or functional polymer composite. INTRODUTIONUHMWPE is a polymer with numerous outstanding properties such as chemical inertness, excellent biocompatibility, good mechanical properties, and widely used in medical and engineering applications. Several unsatisfactory mechanical properties of this polymer are its poor creep-resistance and yield strength. Although UHMWPE exhibits better wear resistance than many other polymers, prolonged use of medical devices made from this polymer used as artificial joint produced debris in the human body. 1 This phenomenon shortens the lifetime of the device and induces pain to the patient. 2,3 Therefore, improving the wear resistance of UHMWPE is still urgent for its application as artificial organ and in engineering devices. Physical blending 4 and radiation crosslinking 5 are two useful methods for improving the wear resistance of UHMWPE. 6,7 Many fillers, such as carbon black, carbon fibers, 8,9 carbon nanotubes (CNTs), 7,10 and Al 2 O 3 , have been added to UHMWPE for physical blending to improve the wear resistance of this polymer. 11 However, dispersion compatibility remains a problem in most cases primarily because of the remarkable difference in chemical structure and surface energy. In addition, the chemical and physiological toxicity of the added material are important in vivo. For instance, 0.1 wt % CNTs in polyethylene can reduce the 80% wear of polyethylene, 12 but this supplementation can even induce cancer in vivo. 13 Therefore, these composites have not been used clinically. Polyethylene blends with other types of polyethylene exhibit better compatibility and lower physiological toxicity than blends with other materials. [14][15][16] This blending method can be used to improve the mechanical properties of UHMWPE. 15,17 Radiation crosslinking can obviously alter the chemical and crystal structures of UHMWPE. This process increases the molecular weight and induces the formation of crosslinking networks. These characteristics sufficiently improve the mechanical properties of UHMWPE such as creep resistanc...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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More wear‐resistant and ductile UHMWPE composite prepared by the addition of radiation crosslinked UHMWPE powder

Wang

Zhang

et al. 2016

J of Applied Polymer Sci

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“…Ultrahigh molecular weight polyethylene (UHMWPE) is a simple linear polymer with excellent impact resistance, toughness, and abrasion resistance. 17 The infrared spectrum of UHMWPE is shown in Figure S1. The atmospheric window corresponds to a wavelength range of 3-5 and 8-14 μm.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of light‐weight ultrahigh molecular weight polyethylene films with hybrid porous structure and the thermal insulation properties

Shen

Liu

Jiang³

et al. 2022

J of Applied Polymer Sci

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According to the infrared stealth mechanism, controlling the surface temperature of objects can effectively hide the infrared radiation and resist the infrared detection. In this paper, a high infrared transparent polymer ultrahigh molecular weight polyethylene (UHMWPE) is selected as the matrix of a thermal insulation material. UHMWPE porous films with high porosity and hybrid pore structure are obtained through the thermal induced phase separation combining with particle leaching method. The film structures with micropores and macropores are adjusted through the variation of the mass ratio of UHMWPE/liquid paraffin, the dosage and the particle size of NaCl. The thermal conductivity of the UHMWPE film is as low as 0.034 W/(m K), while the density is only 54.4 mg/cm 3 . The classical Maxwell-Eucken model is used to discuss the relationship between the pore structure and the thermal conductivity of the films. It is determined that the hybrid porous structure can reduce heat conduction and gas-solid coupling effect simultaneously, thus the thermal conductivity is significantly reduced. Moreover, the porous films exhibited remarkable flexibility and hydrophobicity. Based on these properties, the porous films are highly promising in the field of thermal insulation protection and infrared stealth.

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“…Organic–inorganic hybrids materials attracted a widespread attention due to the prominent improvement in the mechanical, thermal, electrical properties compared to the neat organic materials . As a common inorganic filler, nano‐silica (SiO 2 ) possesses small size effect, surface and boundary effect, quantum size effect, and so on, which give it high strength, toughness, and thermal stability . Nano‐silica is expected to hybrid with CNC to develop a novel CNC‐SiO 2 nanohybrids with better properties, especially thermal stability .…”

Section: Introductionmentioning

confidence: 99%

In situ fabrication of cellulose nanocrystal‐silica hybrids and its application in UHMWPE: Rheological, thermal, and wear resistance properties

Huang

et al. 2017

Polymer Composites

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Novel cellulose nanocrystal (CNC)‐silica (SiO2) nanohybrids with a better thermal stability were successfully fabricated by sol–gel method. In this unique hybrid architecture, it was found that silica particles were uniformly adsorbed/anchored by the CNC via covalent bonding and hydrogen bonding. Subsequently, the nanocomposites containing nanofillers (CNC‐SiO2 nanohybrids or CNC), ultrahigh molecular weight polyethylene (UHMWPE), polyethylene glycol (PEG), were prepared by the twin screw extrusion and their properties and structure were systematically investigated. With the incorporation of CNC‐SiO2 nanohybrids (or CNC) into the UHMWPE matrix, the tensile strength, flexural strength, flexural modulus, vicat softening temperature, and crystallinity of the ensuing nanocomposites were significantly increased. Meanwhile, the nanofiller could enhance the wear resistance of UHMWPE. Notably, compared to CNC, the unique beaded structure of CNC‐SiO2 nanohybrids could endow the UHMWPE with an overall superior performance. POLYM. COMPOS., 39:E1701–E1713, 2018. © 2017 Society of Plastics Engineers

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Preparation of a Thermally Insulating Nanocomposite by Blending Ultra-High-Molecular-Weight Polyethylene with Gas-Phase Silica

Cited by 7 publications

References 42 publications

More wear‐resistant and ductile UHMWPE composite prepared by the addition of radiation crosslinked UHMWPE powder

More wear‐resistant and ductile UHMWPE composite prepared by the addition of radiation crosslinked UHMWPE powder

Fabrication of light‐weight ultrahigh molecular weight polyethylene films with hybrid porous structure and the thermal insulation properties

In situ fabrication of cellulose nanocrystal‐silica hybrids and its application in UHMWPE: Rheological, thermal, and wear resistance properties

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