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The Effect of High Concentration and Small Size of Nanodiamonds on the Strength of Interface and Fracture Properties in Epoxy Nanocomposite.

作者信息

Haleem Yasir A, Song Pin, Liu Daobin, Wang Changda, Gan Wei, Saleem Muhammad Farooq, Song Li

机构信息

National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230029, Anhui, China.

School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230029, Anhui, China.

出版信息

Materials (Basel). 2016 Jun 23;9(7):507. doi: 10.3390/ma9070507.

DOI:10.3390/ma9070507
PMID:28773628
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5456879/
Abstract

The concentration and small size of nanodiamonds (NDs) plays a crucial role in the mechanical performance of epoxy-based nanocomposites by modifying the interface strength. Herein, we systemically analyzed the relation between the high concentration and small size of ND and the fracture properties of its epoxy-based nanocomposites. It was observed that there is a two-fold increase in fracture toughness and a three-fold increase in fracture energy. Rationally, functionalized-NDs (F-NDs) showed a much better performance for the nanocomposite than pristine NDs (P-NDs) because of additional functional groups on its surface. The F-ND/epoxy nanocomposites exhibited rougher surface in contrast with the P-ND/epoxy, indicating the presence of a strong interface. We found that the interfaces in F-ND/epoxy nanocomposites at high concentrations of NDs overlap by making a web, which can efficiently hinder further crack propagation. In addition, the de-bonding in P-ND/epoxy nanocomposites occurred at the interface with the appearance of plastic voids or semi-naked particles, whereas the de-bonding for F-ND/epoxy nanocomposites happened within the epoxy molecular network instead of the interface. Because of the strong interface in F-ND/epoxy nanocomposites, at high concentrations the de-bonding within the epoxy molecular network may lead to subsequent cracks, parallel to the parent crack, via crack splitting which results in a fiber-like structure on the fracture surface. The plastic void growth, crack deflection and subsequent crack growth were correlated to higher values of fracture toughness and fracture energy in F-ND/epoxy nanocomposites.

摘要
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/42a637ce30b0/materials-09-00507-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/3a4afe33eb56/materials-09-00507-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/f2d9b721d01a/materials-09-00507-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/7d6b0f6299c9/materials-09-00507-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/2313e9579b75/materials-09-00507-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/fb123b027487/materials-09-00507-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/eb9cfb819024/materials-09-00507-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/bcd85877b9b7/materials-09-00507-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/42a637ce30b0/materials-09-00507-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/3a4afe33eb56/materials-09-00507-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/f2d9b721d01a/materials-09-00507-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/7d6b0f6299c9/materials-09-00507-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/2313e9579b75/materials-09-00507-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/fb123b027487/materials-09-00507-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/eb9cfb819024/materials-09-00507-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/bcd85877b9b7/materials-09-00507-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a2e0/5456879/42a637ce30b0/materials-09-00507-g008.jpg

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本文引用的文献

1
Effective amino-functionalization of carbon nanotubes for reinforcing epoxy polymer composites.用于增强环氧聚合物复合材料的碳纳米管的有效氨基功能化
Nanotechnology. 2006 Mar 28;17(6):1551-7. doi: 10.1088/0957-4484/17/6/003. Epub 2006 Feb 21.
2
Nanoindentation study of interphases in epoxy/amine thermosetting systems modified with thermoplastics.热塑性塑料改性环氧/胺热固性体系中间相的纳米压痕研究
J Colloid Interface Sci. 2009 Aug 15;336(2):431-7. doi: 10.1016/j.jcis.2009.04.068. Epub 2009 May 5.
3
Control of sp2/sp3 carbon ratio and surface chemistry of nanodiamond powders by selective oxidation in air.
通过在空气中进行选择性氧化来控制纳米金刚石粉末的sp2/sp3碳比和表面化学性质。
J Am Chem Soc. 2006 Sep 6;128(35):11635-42. doi: 10.1021/ja063303n.