scholarly journals Amino-diol borate complexation for controlling transport phenomena of penetrant molecules into polymeric matrices

2019 ◽  
Vol 10 (36) ◽  
pp. 4920-4929 ◽  
Author(s):  
Matthew G. Unthank ◽  
Colin Cameron ◽  
Anthony Wright ◽  
David Hughes ◽  
M. Ashraf Alam ◽  
...  
Keyword(s):  
Hybrid Material ◽  
Transport Phenomena ◽  
Polymer Networks ◽  
Polymeric Matrices ◽  
Epoxy Amine ◽  
New Type ◽  
Borate Complexation ◽  
Solvent Molecules

A new type of epoxy-amine-borate (EAB) hybrid material is reported for control of penetrant solvent molecules into cross-linked polymer networks.

scholarly journals Bisphenol-Free Epoxy Resins Derived from Natural Resources Exhibiting High Thermal Conductivity

Proceedings ◽  
2020 ◽  
Vol 69 (1) ◽  
pp. 18
Author(s):  
Matthias Sebastian Windberger ◽  
Evgenia Dimitriou ◽  
Frank Wiesbrock
Keyword(s):  
Thermal Conductivity ◽  
Natural Resources ◽  
Polymer Networks ◽  
Sio2 Nanoparticles ◽  
Diglycidyl Ether ◽  
Epoxy Compound ◽  
Inorganic Materials ◽  
Limiting Factor ◽  
Epoxy Amine ◽  
Π Stacking

Polymers commonly have low thermal conductivity in the range of 0.1–0.2 W·m−1·K−1, which is a limiting factor for their usage in the course of continuously increasing miniaturization and heat generation in electronic applications. Two strategies can be applied to increase the transport of phonons in polymers: (i) the embedment of thermally conductive inorganic materials and (ii) the involvement of aromatic units enabling anisotropy by π–π stacking. In this study, the thermal conductivity of resins based on bisphenol A diglycidyl ether BADGE and 1,2,7,8-diepoxyoctane DEO was compared. DEO can be derived from pseudo-pelletierine, which is contained in the bark of the pomegranate tree. The epoxy compounds were cured with isophorone diamine IPDA, o-dianisidine DAN, or mixtures of the both diamines. Notably, isophorone diamine is derived from isophorone of which the latter naturally occurs in cranberries. The formulations were produced without filler or with 5 wt.-% of SiO2 nanoparticles. Significantly enhanced thermal conductivity in the range of 0.4 W·m−1·K−1 occurs only in DEO-based polymer networks that were cured with DAN (and do not contain SiO2 fillers). This observation is argued to originate from π–π stacking of the aromatic units of DAN enabled by the higher flexibility of the aliphatic carbon chain of DEO compared to that of BADGE. This assumption is further supported by the facts that significantly improved thermal conductivity occurs only above the glass-transition temperature and that nanoparticles appear to disrupt the π–π stacking of the aromatic groups. In summary, it can be argued that the bisphenol-free epoxy/amine resin with an epoxy compound derivable from natural resources shows favorably higher thermal conductivity in comparison to the petrol-based epoxy/amine resins.

TiO2-B nanoribbons anchored with NiO nanosheets as hybrid anode materials for rechargeable lithium ion batteries

CrystEngComm ◽  
2015 ◽  
Vol 17 (7) ◽  
pp. 1710-1715 ◽  
Author(s):  
Jiayan Zhang ◽  
Jianxing Shen ◽  
Tailin Wang ◽  
Huayong Zhang ◽  
Changbao Wei ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Hybrid Material ◽  
Anode Materials ◽  
Lithium Ion ◽  
New Type ◽  
Nio Nanosheets

A new type of TiO2-B nanoribbons anchored with NiO nanosheets hybrid material is synthesized and exhibit outstanding electrochemical properties.

Self-assembling of three rare structurally various homomultinuclear CuII complexes derived from a bis(salamo)-based multioxime ligand

2021 ◽  
Vol 77 (5) ◽  
pp. 848-860
Author(s):  
Peng Li ◽  
Ting Zhang ◽  
Li-Li Li ◽  
Wen-Kui Dong
Keyword(s):  
Complex Structure ◽  
Three Dimensional ◽  
Monoclinic Space Group ◽  
Space Group ◽  
X Ray Crystallography ◽  
Self Assembling ◽  
Elemental Analyses ◽  
New Type ◽  
Spiral Structures ◽  
Solvent Molecules

A family of rare structurally different homometal multinuclear CuII bis(salamo)-based complexes, [Cu4(L)2(MeOH)2](ClO4)2·2MeOH (1), [Cu4(L)2(EtOH)2](NO3)2·2EtOH (2) and [Cu2(HL)(EtOH)Br2]·CHCl3 (3), has been successfully synthesized by the reactions of cupric salts with a bis(salamo)-based multidentate chelate ligand (H3 L). The salamo-based ligand [R-CH=N—O—(CH2) n —O—N=CH—R] is a new type of salen-based analog. Complexes (1) and (2) are isostructural structures, and crystallize in monoclinic space group P21/n with centrosymmetric spiral structures, where the main structures contain two fully deprotonated ligand (L)3− units, a charged tetranuclear CuII folding center and two coordinated solvent molecules. Complex (3) crystallizes in monoclinic space group Cc and consists of two CuII cations, one incompletely deprotonated ligand (HL)2− unit and one coordinated ethanol molecule, and forms a novel homo-binuclear CuII complex structure due to Br− counter anions. Complexes (1)–(3) have zero-dimensional cluster-based structures and are further assembled into three-dimensional frameworks via intermolecular interactions. Because of the different solvents and counter anions which have a significant influence on the structures of complexes (1)–(3), the interactions were quantitatively evaluated by Hirshfeld surfaces analyses. Complexes (1)–(3) have been characterized by elemental analyses, IR spectra, UV–vis spectra and X-ray crystallography analyses. In addition, fluorescence properties are evaluated and DFT calculations are performed.

scholarly journals Temperature-Triggered/Switchable Thermal Conductivity of Epoxy Resins

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 65
Author(s):  
Matthias Sebastian Windberger ◽  
Evgenia Dimitriou ◽  
Sarah Rendl ◽  
Karin Wewerka ◽  
Frank Wiesbrock
Keyword(s):  
Thermal Conductivity ◽  
Polymer Networks ◽  
Diglycidyl Ether ◽  
Epoxy Compound ◽  
Inorganic Materials ◽  
Glass Transition Point ◽  
Limiting Factor ◽  
Epoxy Amine ◽  
Π Stacking ◽  
Enhanced Thermal Conductivity

The pronouncedly low thermal conductivity of polymers in the range of 0.1–0.2 W m−1 K−1 is a limiting factor for their application as an insulating layer in microelectronics that exhibit continuously higher power-to-volume ratios. Two strategies can be applied to increase the thermal conductivity of polymers; that is, compounding with thermally conductive inorganic materials as well as blending with aromatic units arranged by the principle of π-π stacking. In this study, both strategies were investigated and compared on the example of epoxy-amine resins of bisphenol A diglycidyl ether (BADGE) and 1,2,7,8-diepoxyoctane (DEO), respectively. These two diepoxy compounds were cured with mixtures of the diamines isophorone diamine (IPDA) and o-dianisidine (DAN). The epoxy-amine resins were cured without filler and with 5 wt.-% of SiO2 nanoparticles. Enhanced thermal conductivity in the range of 0.4 W·m−1·K−1 was observed exclusively in DEO-based polymer networks that were cured with DAN (and do not contain SiO2 fillers). This observation is argued to originate from π-π stacking of the aromatic units of DAN enabled by the higher flexibility of the aliphatic carbon chain of DEO compared with that of BADGE. The enhanced thermal conductivity occurs only at temperatures above the glass-transition point and only if no inorganic fillers, which disrupt the π-π stacking of the aromatic groups, are present. In summary, it can be argued that the bisphenol-free epoxy-amine resin with an epoxy compound derivable from natural resources shows favorably higher thermal conductivity in comparison with the petrol-based bisphenol-based epoxy/amine resins.

Wet-Chemical Synthesis and Enhanced Photocatalytic Performance of ZnO/Ag Micro Hybrid Material

2011 ◽  
Vol 328-330 ◽  
pp. 1139-1142 ◽  
Author(s):  
Pei Yan Ma ◽  
Yan Wu ◽  
Zheng Yi Fu ◽  
Wei Min Wang
Keyword(s):  
Photocatalytic Activity ◽  
Hybrid Material ◽  
Chemical Method ◽  
Photocatalytic Performance ◽  
Face Centered Cubic ◽  
Wet Chemical Method ◽  
Wet Chemical Synthesis ◽  
New Type ◽  
Wet Chemical ◽  
Face Centered

A new type of ZnO/Ag micro hybrid material has been fabricated by a facile wet chemical method using citrate as a crystal growth modifier. The morphology and component of ZnO/Ag hybrid material were characterized by SEM and XRD. It is shown that the platelike crystals connect together by means of embedding. The sample is composed of wurtzite ZnO and face-centered cubic Ag. The results of XPS, UV-Vis and PL spectra verify the electron transfer from Ag to ZnO. The photocatalytic test with Rhodamine B (RhB) as a representative dye pollutant shows that the ZnO/Ag hybrid material exhibits an improved photocatalytic activity.

Organic nanocrystals grown in sol–gel matrices: a new type of hybrid material for optics

2002 ◽  
Vol 3 (4) ◽  
pp. 463-478 ◽  
Author(s):  
Julien Zaccaro ◽  
Nathalie Sanz ◽  
Estelle Botzung Appert ◽  
Patrice L. Baldeck ◽  
Alain Ibanez
Keyword(s):  
Hybrid Material ◽  
Sol Gel ◽  
Organic Nanocrystals ◽  
New Type
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