Dynamic tensile failure of epoxy resin cured with two different curing agents was studied in terms of spall strength, fracture toughness, and shock behaviour. Plate impact experiments were conducted to examine how the epoxy responds to one-dimensional, high-strain rate loading. Velocity measurem...
Alkali activated slag (AAS) commonly exhibits very large autogenous shrinkage, which can be reduced or eliminated by internal curing. However, using existing internal curing agents can induce significant reduction of the compressive strength. To address this issue, this study proposes to use per...
As a representative single component epoxy resin, diglycidyl ether of bisphenol A resin (DGEBA) is the most widely used matrix in adhesives. However, challenges are still remained including high curing temperature and short shelf life. Herein, bisphenol A (BPA), Tetrachlorobisphenol A (TCBPA), a...
Low-temperature curing polyethersulfone (PES) coatings (LTCC-PES and LTCC-PES/PTFE) with excellent anti-corrosion properties have been successfully fabricated by introducing crosslinking agent. Water absorption of LTCC-PES is far lower than the common neat epoxy coatings, indicating LTCC-PES can...
In the present study, phosphorus-sulphur containing di and tetra functional carboxyl curing agents were synthesized from renewable resource, cardanol and used in the preparation of high performance epoxy coatings. Structure of the curing agents was analysed by evaluating its acid and iodine numb...
In this study, 1-cyanoethyl-2-ethyl-4-methylimidazole (1C2E4MI) was modified by copper chloride to improve its thermal latency towards epoxy resins. Unexpected complexation between 1C2E4MI and copper chloride was discovered, and two complexes which included a liquid and a solid were generated. T...
Effects of curing temperature on the hydration and expansion behaviours of MgO expansive agents with different reactivities in cement pastes were investigated via quantitative examination on the hydration degree of MgO, expansion, and microstructure of the cement pastes cured under various tempe...
In this work, a bio-based macromolecule ammonium phytic acid named as PA-AEP was synthesized successfully via neutralization reaction between phytic acid (PA) and N-aminoethylpiperazine (AEP) and served as a monocomponent flame-retardant curing agent to improve the flame retardancy and smoke sup...
Phenoxyacetate herbicides, such as 2,4-D and MCPA, having a high toxicity to non-target organisms are commonly used for controlling broadleaf weeds in agriculture. However, novel and environmentally friendly analogs are constantly sought after. For this purpose, various substituents at the pheny...
The molecular geometry of compounds of the series (CH3)nSi(NCX)4-n, (where n 0, 1, 2, 3 X S, O) were investigated with the objective of determining the magnitudes of the SiNC angles. Measurement of the infrared spectra and dipole moments were carried out. The infrared spectra unambiguo...
AimTo evaluate the effect of different types of novel silane coupling agents with two concentrations on the micro-tensile bond strength of a dental glass ceramic with leucite crystals to a dual-cured resin cement using an optimized method of silane application.
Precursor of polyimide, polyamic acid has been prepared by reacting 4,4′-oxydianiline with 3,3′,4,4′-benzophenone tetracarboxylic dianhydride. Acid modified multiwall carbon nanotubes (MWCNTs) were grafted with 3-isocyanato-propyltriethoxysilane. Silane grafted MWCNTs were then mixed with the...
SiO2:polyethylene glycol (PEG)–3-isocyanato-propyltrietoxysilane (IPTES) hydrophilic films were prepared from PEG having various average molecular weights, namely 200, 400 and 600; SiO2 nanoparticles, and tetraethyl orthosilicate (TEOS) through sol–gel method. SiO2 nanoparticles were utilized ...
Mixtures of (poly)isocyanate and water glass (WG) result in water-in-oil emulsions. After an indirect two-step reaction a thermosetting organomineral hybrid resin is obtained. Crosslinked polyurea serves as the organic part, while cavitated non-bonded polysilicate particles in micron-size serve ...
Silica aerogels have only half the thermal conductivity of conventional insulation, but their application potential is limited by the poor mechanical properties. The fragility arises from the thin necks between the silica nanoparticle building blocks. Here, we produce strong silica aerogels thro...
ObjectiveTo give a current review of silane adhesion chemistry, applications of silane coupling agents and related surface pretreatment methods in contemporary dentistry.
Titanium(IV) chloride and silyl reagents mediated regio- and chemoselective ring opening reactions of oxa-bridged piperidinone ring systems were demonstrated. This methodology interestingly undergoes the stereoselective ring opening at the C–O bond of oxa-bridged piperidinone ring systems. Stud...
(4S,5S)-5-hydroxy-4-methylpiperidine-2-one 4, readily available from S-glutamic acid, serves as a starting material for the synthesis of (2S,4S,5S)-5-hydroxy-4-methylpipecolic acid 12. The key step of this reaction sequence is the chemoselective methylenation of the amide carbonyl group of 6 wit...
The impact of pollution on children's health has been increasingly pointed out in numerous studies which emphasized their increased vulnerability compared to adults. This pilot study investigated the relevance of hair analysis for the assessment of children exposure to pollution and to envi...
Peroxy-organic acids are formed by the chemical reaction between organic acids and hydrogen peroxide. The peroxy-acid process was applied to two Superfund site soils provided by the U.S. Environmental Protection Agency (EPA). Initial small-scale experiments applied ratios of 3:5:7 (v/v/v) or 3:3...
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