On the Structural and Mechanical Properties of Poly(Phenylacetylene) Truss‐Like Hexagonal Hierarchical Nanonetworks

@article{GrimaCornish2017OnTS,
  title={On the Structural and Mechanical Properties of Poly(Phenylacetylene) Truss‐Like Hexagonal Hierarchical Nanonetworks},
  author={James N. Grima-Cornish and Joseph N. Grima and Kenneth E. Evans},
  journal={physica status solidi (b)},
  year={2017},
  volume={254}
}
A novel class of hexagonal nanoscale honeycombs made from penta and tetra substituted polyphenlyacetylenes is proposed and modeled as crystalline systems using force‐field based simulations. It is shown that, in‐plane, these systems behave rather similarly to crystalline forms of graphyne, graphdiyne, and other fully substituted equivalents but benefit from the presence of larger pores which makes them less stiff and may enable them to be used in a wider range of applications such as… 

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References

SHOWING 1-10 OF 94 REFERENCES

Do Zeolites Have Negative Poisson's Ratios?

Consequently, the size of the resulting nanoparticles matches the dimension of the nanometer-sized cavities inside these swollen domains. The possibility of controlling the growth of the metal

Crystalline networks with unusual predicted mechanical and thermal properties

MOST materials shrink laterally and become less dense when stretched. Materials that both expand laterally (that is, have negative Poisson's ratio) and densify when stretched are of interest both

Toward molecular auxetics: Main chain liquid crystalline polymers consisting of laterally attached para‐quaterphenyls

Polymers containing para‐quaterphenyl rods laterally attached to the polymer main chain have been synthesized. The molecular design choices which led to use of the quaterphenyl rod to achieve auxetic

Auxetic two-dimensional polymer networks. An example of tailoring geometry for specific mechanical properties

TLDR
The Poisson's ratios and Young's moduli of 2D molecular networks having conventional and re-entrant honeycomb forms have been modelled using molecular modelling to predict accurately the properties of more complex variants of the networks.

Molecular origin of auxetic behavior in tetrahedral framework silicates.

TLDR
The concurrent model is in excellent agreement with experiment and explains the dichotomy between negative and positive nu(31) values in alpha-cristobalite and alpha-quartz, respectively.

Magnetic and electronic properties of α-graphyne nanoribbons.

TLDR
The zigzag α-graphyne NRs are found to have magnetic semiconducting ground state with ferromagnetic ordering at each edge and opposite spin orientation between the two edges which strongly depends on the width of the ribbon.

Graphene-based composite materials

TLDR
The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.

Modelling of hexagonal honeycombs exhibiting zero Poisson's ratio

A detailed analytical model for novel hexagonal honeycomb structures which are composed of alternate layers of re‐entrant and non re‐entrant features is presented. It is shown that deformation from
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