The influence of epitaxial crystallization on the mechanical properties of a high density polyethylene/reduced graphene oxide nanocomposite injection bar

Yao, Guibin; Duan, Tianchen; An, Minfang; Xu, Haojun; Tian, Feng; Wang, Zongbao

doi:10.1039/c7ra02742g

Cited by 24 publications

(21 citation statements)

References 54 publications

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“…Therefore, on the basis of the DSC and WAXD results, the crystalline degree of PA66 slightly reduces with the increase of RGO in the PA66/RGO nanocomposites. The result of the crystalline degree is consistent with the result of the PE/RGO nanocomposites [42]. It may be due to the fact that RGO hinders the motion of polymer chains.…”

Section: Resultssupporting

confidence: 80%

The Influence of Epitaxial Crystallization on the Mechanical Properties of Polyamide 66/Reduced Graphene Oxide Nanocomposite Injection Bar

Chi

Yao

et al. 2017

Crystals

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Polyamide 66 (PA66) was chosen as the representative of hydrophilic polymers, to investigate the influence of epitaxial crystals in semi-crystalline polymers/reduced graphene oxide nanocomposite injection-molding bars. A differential scanning calorimeter was used, and the two-dimensional wide-angle X-ray diffraction technique, as well as the two-dimensional small angle X-ray scattering technique, were used to research the crystallization behavior in PA66/RGO nanocomposites. The results indicated that RGO was an effective nucleation agent for PA66. The presence of RGO could enhance the orientation degree of the PA66 crystals and did not influence the crystal structure of the PA66. The non-epitaxial crystals and the epitaxial crystals existed in PA66/RGO nanocomposites. The size of epitaxial crystals was much greater than that of the non-epitaxial crystals. Tensile test results showed that the presence of fewer epitaxial crystals can improve the mechanical properties of a polymer.

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Section: Resultssupporting

confidence: 80%

The Influence of Epitaxial Crystallization on the Mechanical Properties of Polyamide 66/Reduced Graphene Oxide Nanocomposite Injection Bar

Chi

Yao

et al. 2017

Crystals

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“…Crystalline polymers are widely used in automobile manufacturing, electronic devices, and building fields because of their better physical properties in comparison with amorphous polymers. [1][2][3] However, the present crystalline polymers are mainly based on general and engineering polymers, including polyvinyl chloride, 4 polyethylene, 5 polybutylene, 6 vinyl ester, 7 and so on. The mechanical strength, thermal stability, and antioxidation were still limited.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and dielectric properties of crystalline poly(arylene ether nitrile) copolymers

Wang

et al. 2018

High Performance Polymers

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Poly(arylene ether nitrile) (PEN) copolymers (HQ/RS-PEN) containing different proportions of hydroquinone (HQ-PEN) block and resorcinol (RS-PEN) block were synthesized, and their crystalline, mechanical, and dielectric properties were investigated. Three HQ/RS-PEN copolymers with 10%, 20%, and 30% of RS-PEN blocks were prepared via condensation polymerization of HQ and RS with 2,6-dichlorobenzonitrile. The PEN copolymers were characterized and confirmed by Fourier transform infrared spectroscopy, intrinsic viscosity, and thermal analyses. With the addition of RS-PEN block, the flexibility of PEN copolymers was increased. In addition, even though the high loading content of RS-PEN block was incorporated, the PEN copolymers still exhibited relatively high dielectric constant, whereas the dielectric loss decreased. Furthermore, to investigate the effect of treatment time and temperature on the physical properties of crystalline PEN copolymers, HQ/RS-PEN20 was isothermally treated at different temperatures (280°C, 300°C, 310°C, 320°C, and 330°C) for a constant time and at a constant time for different hours (1, 2, 3, 4, and 5 h). After the optimization of the crystallization of HQ/RS-PEN polymer, excellent mechanical and dielectric properties of copolymers were obtained. The results showed that when isothermally treated at 320°C for 2 h, the HQ/RS-PEN20 showed optimal properties of tensile strength of 117.6 MPa and dielectric constant of 4.07 at 1 kHz.

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“…It has been confirmed that the PE chains can be absorbed and then epitaxially crystallized on RGO surfaces. In the injection moulding process of HDPE/RGO nanocomposites, it is reasonable that the flow field can also drive the preferred orientation of both HDPE chains and RGO nanosheets [30]. However, in the subsequent cooling course, the situation becomes different from that of pure polymers, for the release of the oriented large RGO nanosheets is rather hard to achieve.…”

Section: Resultsmentioning

confidence: 99%

“…So, when the content of RGO is quite small, the less but highly oriented RGO can also lead to the gently preferred orientation. Recently, we also reported that the introduction of RGO can enhance the mechanical properties of the injection bars of HDPE/RGO nanocomposites [30]. Here, by further investigating the microstructures via microbeam SAXS, despite the presence of weak difference in the enhancing effect at varied positions, especially for the cases of large RGO contents, we have demonstrated that the coupling between the flow-induced orientation and the RGO-depressed release of oriented chains by absorption and then epitaxial crystallization imposes an approximately uniform intensifying effect on the crystallization and orientation of HDPE in the flow direction, which results in the enhancement of the mechanical performance of injection bars of HDPE/RGO nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Microbeam two-dimensional small-angle X-ray scattering investigating the effects of reduced graphene oxide on local microstructures of high-density polyethylene/reduced graphene oxide nanocomposite bars

et al. 2019

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It has been reported that the introduction of reduced graphene oxide (RGO) can enhance the crystallization and orientation of high-density polyethylene (HDPE) matrix and thus improve the mechanical properties of HDPE/RGO nanocomposites. In this study, the local microstructures and orientations in different regions of HDPE/RGO bars with varied RGO contents were further explored by two-dimensional small-angle X-ray scattering using a microbeam technique. It is unveiled that the orientation orderings of each position is intensified with increasing RGO amount, and of particular interest is the observation of the slight change of the ordering degrees in diverse zones of HDPE/RGO nanocomposite bars, indicating that RGO imposes a uniform enhancing effect upon HDPE matrix within different areas and consequently induces an effective increase of the mechanical properties of HDPE/RGO nanocomposites.

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The influence of epitaxial crystallization on the mechanical properties of a high density polyethylene/reduced graphene oxide nanocomposite injection bar

Abstract: High density polyethylene (HDPE)/reduced graphene oxide (RGO) nanocomposite bars were prepared by injection molding and the effects of RGO on the HDPE matrix were investigated.

Cited by 24 publications

References 54 publications

The Influence of Epitaxial Crystallization on the Mechanical Properties of Polyamide 66/Reduced Graphene Oxide Nanocomposite Injection Bar

The Influence of Epitaxial Crystallization on the Mechanical Properties of Polyamide 66/Reduced Graphene Oxide Nanocomposite Injection Bar

Mechanical and dielectric properties of crystalline poly(arylene ether nitrile) copolymers

Microbeam two-dimensional small-angle X-ray scattering investigating the effects of reduced graphene oxide on local microstructures of high-density polyethylene/reduced graphene oxide nanocomposite bars

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