scholarly journals A high modulus hydrogel obtained from hydrogen bond reconstruction and its application in vibration damper

RSC Advances ◽  
2017 ◽  
Vol 7 (69) ◽  
pp. 43755-43763 ◽  
Author(s):  
Longxiang Zhu ◽  
Jianhui Qiu ◽  
Eiichi Sakai
Keyword(s):  
Hydrogen Bond ◽  
Elastic Modulus ◽  
Cross Linking ◽  
High Modulus ◽  
Vibration Damper ◽  
Vibration Absorption ◽  
High Elastic Modulus ◽  
The Cross

The cross-linking network of the hydrogel can be rearranged by evaporation-swelling treatment, the obtained hydrogel possesses an excellent vibration absorption ability and high elastic modulus.

scholarly journals Electro-active elastomer composites based on doped titanium dioxide

2015 ◽  
Vol 3 (7) ◽  
pp. 1546-1556 ◽  
Author(s):  
Alaedine Kossi ◽  
Georges Bossis ◽  
Jacques Persello
Keyword(s):  
Titanium Dioxide ◽  
Elastic Modulus ◽  
Electric Field ◽  
Applied Electric Field ◽  
Cross Linking ◽  
High Elastic Modulus ◽  
Pdms Elastomer ◽  
Doped Titanium Dioxide ◽  
Elastomer Composites

The TiO2-Acac/PDMS elastomer conserves a high elastic modulus change (ΔG′) after cross-linking and achieves ΔG′ higher than 500 kPa for an applied electric field of 2 kV mm−1.

Microstructure and mechanical properties of rolled Mg–Gd–Zn–Zr–Ag–Al–Li alloys

2020 ◽  
Vol 111 (8) ◽  
pp. 645-653
Author(s):  
Xianhua Chen ◽  
Teng Tu ◽  
Tao Chen ◽  
Chunquan Liu ◽  
Fusheng Pan
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Dynamic Recrystallization ◽  
Microstructural Evolution ◽  
Basal Slip ◽  
High Modulus ◽  
High Elastic Modulus ◽  
Microstructure And Mechanical Properties ◽  
Hot Rolled

Abstract The microstructural evolution and mechanical properties of hot rolled Mg-12Gd-1Zn-0.5Zr-0.5Ag (in wt.%) (MGZKA) alloys, with and without Al and Li additions, were investigated in this study. The Al and Li-containing alloys achieved excellent overall mechanical properties, especially MGZKA-6Al5Li alloy with a high elastic modulus of 52.2 GPa and a good plasticity of 15%. Compared with Al and Li-free MGZKA alloy, the fragmented Al2Gd and nanoscale Al2Li3 phases with high modulus are observed in Al and Li-containing MGZKA-4Al3Li and MGZKA-6Al5Li alloys, which contribute to the overall elastic modulus of the alloys. The dynamic recrystallization regions of Al and Li-containing alloys increased while c/a ratio reduced, leading to the weakened texture. The activation of non-basal slip in Al and Li-containing alloys is closely related to the fine grains and weakened texture, which jointly promote the plasticity of Al and Li-containing alloys.

Study on Properties and Cross-Linking Structure of NR Dried by Microwave

2011 ◽  
Vol 335-336 ◽  
pp. 442-445
Author(s):  
Yong Zhou Wang ◽  
Fu Quan Zhang ◽  
Mei Chen ◽  
Ming Zhe Lv ◽  
Hong Hai Huang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Elastic Modulus ◽  
Low Frequency ◽  
Cross Linking ◽  
Test Results ◽  
Frequency Sweep ◽  
Nuclear Magnetic Resonance Spectrometer ◽  
Hot Air ◽  
The Cross ◽  
Frequency Phase

In this work, the cross-linking density and frequency sweep, temperature sweep of NR dried by microwave were tested by using nuclear magnetic resonance spectrometer (NMR) and rubber process analyzer (RPA), respectively. And the test results were compared with those of NR dried by hot-air. The results showed that the cross-linking density and A(Mc) for NR dried by microwave were bigger than those for NR dried by hot-air, but the A(T2) of latter was bigger; the frequency sweep results showed that the elastic modulus of NR dried by hot-air increased slower with the increase of frequency than those of NR dried by microwave , and the tanδ of NR dried by hot-air decreased with the increase of frequency slower than those of NR dried by microwave in low frequency phase, respectively; the temperature sweep results showed that the elastic modulus of NR dried by hot air were smaller compared with those of NR dried by microwave in the entire scanning process, but, the tanδ value of former was bigger.

scholarly journals Investigation of the functional network modifier loading on the stoichiometric ratio of epoxy resins and their dielectric properties

2021 ◽  
Author(s):  
Istebreq A. Saeedi ◽  
Sunny Chaudhary ◽  
Thomas Andritsch ◽  
Alun S. Vaughan
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Epoxy Resins ◽  
Functional Network ◽  
Cross Linking ◽  
Network Modifier ◽  
Epoxy Resin System ◽  
The Cross ◽  
The Impact

AbstractReactive molecular additives have often been employed to tailor the mechanical properties of epoxy resins. In addition, several studies have reported improved electrical properties in such systems, where the network architecture and included function groups have been modified through the use of so-called functional network modifier (FNM) molecules. The study reported here set out to investigate the effect of a glycidyl polyhedral oligomeric silsesquioxane (GPOSS) FNM on the cross-linking reactions, glass transition, breakdown strength and dielectric properties of an amine-cured epoxy resin system. Since many previous studies have considered POSS to act as an inorganic filler, a key aim was to consider the impact of GPOSS addition on the stoichiometry of curing. Fourier transform infrared spectroscopy revealed significant changes in the cross-linking reactions that occur if appropriate stoichiometric compensation is not made for the additional epoxide groups present on the GPOSS. These changes, in concert with the direct effect of the GPOSS itself, influence the glass transition temperature, dielectric breakdown behaviour and dielectric response of the system. Specifically, the work shows that the inclusion of GPOSS can result in beneficial changes in electrical properties, but that these gains are easily lost if consequential changes in the matrix polymer are not appropriately counteracted. Nevertheless, if the system is appropriately optimized, materials with pronounced improvements in technologically important characteristics can be designed.

scholarly journals The Effect of Surfactant-Modified Montmorillonite on the Cross-Linking Efficiency of Polysiloxanes

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2623
Author(s):  
Monika Wójcik-Bania ◽  
Jakub Matusik
Keyword(s):  
Total Pore Volume ◽  
Cross Linking ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
The Cross ◽  
Chain Lengths ◽  
First Time ◽  
Substituent Influence ◽  
Benzyl Substituent

Polymer–clay mineral composites are an important class of materials with various applications in the industry. Despite interesting properties of polysiloxanes, such matrices were rarely used in combination with clay minerals. Thus, for the first time, a systematic study was designed to investigate the cross-linking efficiency of polysiloxane networks in the presence of 2 wt % of organo-montmorillonite. Montmorillonite (Mt) was intercalated with six quaternary ammonium salts of the cation structure [(CH3)2R’NR]+, where R = C12, C14, C16, and R’ = methyl or benzyl substituent. The intercalation efficiency was examined by X-ray diffraction, CHN elemental analysis, and Fourier transform infrared (FTIR) spectroscopy. Textural studies have shown that the application of freezing in liquid nitrogen and freeze-drying after the intercalation increases the specific surface area and the total pore volume of organo-Mt. The polymer matrix was a poly(methylhydrosiloxane) cross-linked with two linear vinylsiloxanes of different siloxane chain lengths between end functional groups. X-ray diffraction and transmission electron microscopy studies have shown that the increase in d-spacing of organo-Mt and the benzyl substituent influence the degree of nanofillers’ exfoliation in the nanocomposites. The increase in the degree of organo-Mt exfoliation reduces the efficiency of hydrosilylation reaction monitored by FTIR. This was due to physical hindrance induced by exfoliated Mt particles.

Effects of a crosslinking agent on a supramolecular gel to control lost circulation

2021 ◽  
Vol 45 (16) ◽  
pp. 7089-7095
Author(s):  
Bo Wang ◽  
Jinsheng Sun ◽  
Kaihe Lv ◽  
Feng Shen ◽  
Yingrui Bai
Keyword(s):  
Crosslinking Agent ◽  
Network Density ◽  
Cross Linking ◽  
Supramolecular Gel ◽  
Lost Circulation ◽  
The Cross

The Cr3+ can improve the cross-linking degree and network density of the GP-A gel, and enhance its strength and plugging ability to control lost circulation.

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