Effect of epitaxial crystallization on the structural evolution of PCL/RGO nanocomposites during stretching by in-situ synchrotron radiation

Duan, Tianchen; Xu, Haojun; Tang, Yujing; Jin, Jing; Wang, Zongbao

doi:10.1016/j.polymer.2018.11.020

Cited by 14 publications

(7 citation statements)

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“…We recently reported that strain-induced melting− recrystallization took place in the stretching process of poly(εcaprolactone) (PCL)/RGO nanocomposites with a low velocity at room temperature, and epitaxial crystallization imposed a restriction effect on the structural transformation of PCL and confirmed that the epitaxial crystallization of PCL upon RGO surfaces is the major factor for the improvement of mechanical properties of PCL/RGO nanocomposites. 54 We also reported that the RGO and HDPE crystals epitaxially grown on the RGO lead to the delay of the structural evolution and then the enhancement of mechanical properties of HDPE/ RGO nanocomposites. 55 Our previous work showed that the crystal of PA66/RGO nanocomposites included the non-epitaxial and the epitaxial crystals, and the content of two kinds of crystal changed, from all non-epitaxial crystals to almost all epitaxial crystals, with the RGO content in nanocomposites.…”

Section: Introductionmentioning

confidence: 83%

“…The cold stretching has been widely accepted for the study on structural evolution and mechanical property of a semicrystalline polymer. − Although an extensive number and variety of investigations have been carried out on the deformation behavior of semicrystalline polymers, there are few literature studies concerning the tensile deformation behavior of polymer/nanofillers composites, especially for those with epitaxial crystals. We recently reported that strain-induced melting–recrystallization took place in the stretching process of poly(ε-caprolactone) (PCL)/RGO nanocomposites with a low velocity at room temperature, and epitaxial crystallization imposed a restriction effect on the structural transformation of PCL and confirmed that the epitaxial crystallization of PCL upon RGO surfaces is the major factor for the improvement of mechanical properties of PCL/RGO nanocomposites . We also reported that the RGO and HDPE crystals epitaxially grown on the RGO lead to the delay of the structural evolution and then the enhancement of mechanical properties of HDPE/RGO nanocomposites …”

Section: Introductionmentioning

confidence: 99%

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In Situ SAXS and WAXD Investigations of Polyamide 66/Reduced Graphene Oxide Nanocomposites During Uniaxial Deformation

2021

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Epitaxial crystallization between Polyamide 66 (PA66) and reduced graphene oxide (RGO) can enhance the interfacial interaction and the mechanical properties of PA66/RGO nanocomposites. In situ two-dimensional synchrotron radiation wide angle X-ray diffraction and small angle X-ray scattering were used to track the structural evolution of the PA66/RGO nanocomposites with an epitaxial crystal during uniaxial deformation. In the PA66/RGO nanocomposites, the structural evolution of non-epitaxial and epitaxial crystals could be clearly analyzed. The non-epitaxial crystal, whose crystal plane can slip, shows the rearrangement and the Brill transition during uniaxial deformation. While the PA66 chains of an epitaxial crystal are held by RGO, the crystal plane could therefore not slip. The epitaxial crystal also constrains the deformation of the amorphous phase and the crystal form transition of non-epitaxial crystals around them. With the content increase of epitaxial crystals, the constraint effect becomes more obvious. Therefore, the rigid epitaxial crystals in the PA66/RGO nanocomposites promote mechanical properties. The present findings can deepen the understanding of structural evolution during the tensile deformation of PA66/RGO nanocomposites and the influence of the epitaxial crystals on the mechanical property in semicrystalline polymers with a H-bond.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

In Situ SAXS and WAXD Investigations of Polyamide 66/Reduced Graphene Oxide Nanocomposites During Uniaxial Deformation

2021

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“…Moreover, the azimuth angle of the hydrogel sample at 90° and 270° increased gradually with the prestretching deformation and became more and more sharp (Figure c). These clearly signaled the appearance of orientation alignment inside the hydrogel . Further, the 2D SAXS pattern of the original PVA/1CNF/0 hydrogel was distinctly isotropic, as evidenced by the almost identical scattering intensity in all directions (Figure b).…”

Section: Resultsmentioning

confidence: 84%

Natural-Wood-Inspired Ultrastrong Anisotropic Hybrid Hydrogels Targeting Artificial Tendons or Ligaments

Kang

Shi

et al. 2023

ACS Nano

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Hydrogels are able to mimic the flexibility of biological tissues or skin, but they still cannot achieve satisfactory strength and toughness, greatly limiting their scope of application. Natural wood can offer inspiration for designing high-strength hydrogels attributed to its anisotropic structure. Herein, we propose an integrated strategy for efficient preparation of ultrastrong hydrogels using a salting-assisted prestretching treatment. The as-prepared poly(vinyl alcohol)/cellulose nanofiber hybrid hydrogels show distinct wood-like anisotropy, including oriented molecular fiber bundles and extended grain size, which endows materials with extraordinarily comprehensive mechanical properties of ultimate breaking strength exceeding 40 MPa, strain approaching 250%, and toughness exceeding 60 MJ·m–3, and outstanding tear resistance. Impressively, the breaking strength and toughness of the reswollen preoriented hydrogels approach 10 MPa and 25 MJ·m–3, respectively. In vitro and in vivo tests demonstrate that the reswollen hydrogels do not affect the growth and viability of the cells, nor do they cause the inflammation or rejection of the mouse tissue, implying extremely low biotoxicity and perfect histocompatibility, showcasing bright prospects for application in artificial ligaments or tendons. The strategy provided in this study can be generalized to a variety of biocompatible polymers for the fabrication of high-performance hydrogels with anisotropic structures.

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“…Graphene oxide (GO) was exfoliated by ultrasonication from graphite oxide, which was produced by a modified Hummers method . Reduced graphene oxide was prepared by thermal exfoliation and reduction of GO …”

Section: Methodsmentioning

confidence: 99%

“…In addition, graphene has a high specific surface area, which decreases the surface free energy barrier and facilitates the epitaxial growth of polymers on its surface. The space lattice matching between PE and graphene results in the formation of edge-on lamellae on the graphene surface that are much thicker than those produced by bulk crystallization. − In our previous work, we studied the crystallization and mechanical properties of PCL/reduced graphene oxide (RGO) nanocomposites, and the results indicated that the epitaxial interaction between PCL and RGO can enhance the crystallization and orientation of the PCL matrix, which is the major factor for the improvement of mechanical properties …”

Section: Introductionmentioning

confidence: 99%

Epitaxial Crystallization of Poly(ε-caprolactone) on Reduced Graphene Oxide at a Low Shear Rate by In Situ SAXS/WAXD Methods

Miao

Zhou

et al. 2020

ACS Omega

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The interfacial interaction between polymers and reinforcements has a positive effect on the properties of polymer nanocomposites, and a further study on the evolution of this interfacial interaction under a shear field is conducive to reasonable regulation of the properties of polymer nanocomposites. For this purpose, epitaxial crystallization of poly(ε-caprolactone) (PCL) on reduced graphene oxide (RGO) is investigated by shearing at the shear rate of 3 s −1 by in situ synchrotron radiation. In situ two-dimensional small-angle X-ray scattering (2D SAXS) results suggest that the imposed shear field promotes the orientation of the polymer chains, resulting in the formation of a large periodic structure of PCL on the RGO surface. In addition, higher shear temperatures facilitate the conformational adjustment of the PCL molecular chain on RGO at the shear rate of 3 s −1 , resulting in the formation of thicker lamellae. In situ two-dimensional wide-angle X-ray diffraction (2D WAXD) results show that shear enhances the crystallinity of the PCL/RGO nanocomposite and promotes the oriented growth of epitaxial and bulk crystals. The current findings can improve the understanding of the structural evolution behavior of PCL/RGO nanocomposites after shear and especially enhance dramatically our understanding of the underlying mechanism of influence of shear on interfacial epitaxial crystallization in polymer/graphene nanocomposite systems.

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Effect of epitaxial crystallization on the structural evolution of PCL/RGO nanocomposites during stretching by in-situ synchrotron radiation

Cited by 14 publications

References 55 publications

In Situ SAXS and WAXD Investigations of Polyamide 66/Reduced Graphene Oxide Nanocomposites During Uniaxial Deformation

In Situ SAXS and WAXD Investigations of Polyamide 66/Reduced Graphene Oxide Nanocomposites During Uniaxial Deformation

Natural-Wood-Inspired Ultrastrong Anisotropic Hybrid Hydrogels Targeting Artificial Tendons or Ligaments

Epitaxial Crystallization of Poly(ε-caprolactone) on Reduced Graphene Oxide at a Low Shear Rate by In Situ SAXS/WAXD Methods

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