PubMed Journals Articles About "Floor Adhesive Market Type Epoxy Urethane Acrylic Vinyl" RSS

04:56 EST 17th December 2018 | BioPortfolio

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Showing "Floor Adhesive Market Type Epoxy Urethane Acrylic Vinyl" PubMed Articles 1–25 of 14,000+

Occupational asthma from epoxy compounds.

Two-component epoxy resin systems (ERS) composed of epoxy resin and polyamine hardeners are extensively used in industrial and construction coating. Triglycidyl isocyanurate (TGIC) is another type of epoxy derivative, mostly encountered in polyester powder paints. Epoxy compounds are well known skin sensitizers, but their respiratory sensitizing potential is largely unknown.

Isocyanate-terminated urethane-based dental adhesive bridges dentinal matrix collagen with adhesive resin.

Commercially available dental adhesives fail to chemically unite the demineralized collagen matrix with resinous materials within the resin-dentin interface. Sub-micron separations between the collagen fibrils and polymerized resin provide the backdrop for bond deterioration. Here, novel isocyanate-terminated urethane methacrylate precursors (UMP) were synthesized with the capacity to bond chemically to dentin collagen via covalent and hydrogen bonds. Collagen grafted with UMP also copolymerized with other ...

Effects of market type and time of purchase on oxidative status and descriptive off-odors and off-flavors of beef in Vietnam.

The objective of the current study was to determine the effects of market type (super market - SM, indoor market - IM, open market - OM) and sampling time (at the opening - T0 and 4 h after the opening - T4) on antioxidant capacity, lipid oxidation, and descriptive sensory attributes of beef in Vietnam. Values of FC and TEAC were greater in OM beef than IM and SM (P 

Effect of cleaning protocols on bond strength of etch-and-rinse adhesive system to dentin.

This study aimed to evaluate the cleaning protocol of dentin impregnated with epoxy resin-based sealer (AH Plus) and the effects on the adhesive interface using 95% ethanol (E) or formamide solution (F) associated with microabrasion with glass microparticles (M).

Single-site, Organometallic Aluminum Catalysts for the Precise Group Transfer Polymerization of Michael-type Monomers.

Unlike different types of Lewis pairs as polymerization catalysts for acrylic monomers, we herein report on organometallic aluminum(III) compounds, which show a surprisingly high polymerization activity even without an additional Lewis base. DFT calculations, end group analysis and kinetic investigations clearly suggest a main group element (MGE) group transfer polymerization (GTP) mechanism analogous to the known metal-mediated GTP mechanism. The novel catalysts perform a precision polymerization of a broa...

One-Pot Regioselective and Stereoselective Synthesis of C-Glycosyl Amides from Glycals Using Vinyl Azides as Glycosyl Acceptors.

The reaction of glycals containing good leaving groups with aromatic vinyl azides to give α- C-glycosyl amides in good yields is described. Various vinyl azides with different groups undergo the reaction smoothly. In these reactions, an iminodiazonium intermediate is generated by the attack of the vinyl azide onto the glycal under Lewis acid conditions. This undergoes Schmidt-type denitrogenative 1,2-migration to form a nitrilium ion, which, upon hydrolysis, gives the desired C-glycosyl amide.

Epoxy isonitriles, a unique class of antibiotics - Synthesis of their metabolites and biological investigations.

Epoxy isonitrile containing natural products often possess specific and potent antibacterial activity against Gram-positive pathogens. This scaffold, however, is extremely labile under acidic and basic conditions, undergoing a Payne rearrangement to produce a stable epoxy ketone metabolite and releasing hydrogen cyanide. We synthesized and performed biological assays with epoxy ketone containing metabolites and identified that the epoxy isonitrile moiety is pertinent for biological activity. Serendipitously...

Detection of the first higher plant epoxyalcohol synthase: Molecular cloning and characterisation of the CYP74M2 enzyme of spikemoss Selaginella moellendorffii.

The CYP74M2 gene of a model plant, the spikemoss Selaginella moellendorffii Hieron, was cloned and the catalytic properties of corresponding recombinant protein were studied. The recombinant CYP74M2 protein was active towards 13-hydroperoxides of linoleic and a-linolenic acids (13-HPOD and 13-HPOT, respectively). In contrast to previously studied CYP74M1 and CYP74M3, which possessed the divinyl ether synthase activity, CYP74M2 behaved as a dedicated epoxyalcohol synthase (EAS). For instance, the 13-HPOD was...

Density-Functional Tight-Binding Study on the Effects of Interfacial Water in the Adhesion Force between Epoxy Resin and Alumina Surface.

Adhesion is one of the most interesting subjects in interface phenomena from the viewpoint of wide-range applications as well as basic science. Interfacial water has significant effects on coatings, adhesives, and fiber-reinforced polymer composites, often causing adhesion loss. The way of thinking based on quantum mechanics is essential for a better understanding of physical and chemical properties of adhesive interfaces. In this work the molecular mechanism of the adhesion interaction between epoxy resin ...

Highly selective synthesis of acrylic acid from lactide in liquid phase.

A novel reaction system for the highly selective, hydrobromic acid catalysed conversion of lactide into acrylic acid under mild conditions is reported. The applied liquid reaction system consists of a temperature-stable bromide-containing ionic liquid and 2-bromopropionic acid as source of dry HBr, with no volatile organic solvent being used. This allows for the in situ removal of the formed acrylic acid leading to an unmatched acrylic acid selectivity of over 72% at full lactide conversion. Accounting for ...

Post-synthetic modification of zirconium metal-organic frameworks by catalyst-free aza-Michael additions.

The reactions of the zirconium MOF [Zr6O4(OH)4(bdc-NH2)6] (UiO-66-NH2, bdc-NH2 = 2-amino-1,4-benzenedicarboxylate) with the Michael acceptors acrylonitrile (CH2[double bond, length as m-dash]CHCN), acrylic acid (CH2[double bond, length as m-dash]CHCO2H), methyl acrylate (CH2[double bond, length as m-dash]CHCO2Me) and methyl vinyl ketone (CH2[double bond, length as m-dash]CHC(O)Me) led to post-synthetic modification of the MOF through C-N bond formation without loss of crystallinity. The reactions with acryl...

Borinic Acid/Halide Co-catalyzed Semipinacol Rearrangements of 2,3-Epoxy Alcohols.

A new mode of catalysis of the semipinacol rearrangement of 2,3-epoxy alcohols is described. In combination with a halide salt additive, diarylborinic acids promote a Type II rearrangement that occurs with net retention of configuration. This unusual stereochemical outcome is consistent with a mechanism involving regioselective ring opening of the epoxy alcohol by halide, followed by rearrangement of the resulting halohydrin-derived borinic ester. The protocol is applicable to a range of substrates, enablin...

Photoinitiated Seeded RAFT Dispersion Polymerization: A Facile Method for the Preparation of Epoxy-Functionalized Triblock Copolymer Nano-Objects.

In this study, a novel photoinitiated seeded reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization is developed for the preparation of epoxy-functionalized triblock copolymer nano-objects at room temperature. Epoxy-functionalized worms and vesicles prepared by photoinitiated RAFT dispersion polymerization of glycidyl methacrylate are used as seeds for chain extension by photoinitiated seeded RAFT dispersion polymerization of methacrylic and acrylic monomers. Good control is maint...

The use of warmed ethyl vinyl acetate in reassembling skeletal remains.

Fragmentation of skeletal material is a common occurrence in archaeological excavations and during forensic investigations. Traditionally the reconstruction of skeletal fragments has relied on the use of adhesive tapes, waxes and glues. The application of warmed ethyl vinyl acetate or EVA enables precise anatomical location without damage to the skeletal material. If reversal is required, the EVA can be removed without damage. This inexpensive technique will enhance the capabilities of research investigator...

Ultrastiff Graphene Foams as Three-Dimensional Conductive Fillers for Epoxy Resin.

Conductive epoxy composites are of great interest due to their applications in electronics. They are usually made by mixing powdered conductive fillers with epoxy. But the conductivity of the composite is limited by the low filler content because increasing filler content causes processing difficulties and reduces the mechanical properties of the epoxy host. We describe here the use of ultrastiff graphene foams (uGFs) as three-dimensional (3D) continuous conductive fillers for epoxy resins. The powder metal...

Biomechanical testing of a polycarbonate-urethane-based dynamic instrumentation system under physiological conditions.

Posterior dynamic stabilization systems are developed to maintain the healthy biomechanics of the spine while providing stabilization. Numerous dynamic systems incorporate polycarbonate urethane with temperature- and moisture-dependent material properties. In the underlying study, a novel test rig is used to evaluate the biomechanical performance of a system containing polycarbonate urethane.

Photo-Induced Decarboxylative Heck-Type Coupling of Unactivated Aliphatic Acids and Terminal Alkenes in the Absence of Sacrificial Hydrogen Acceptors.

1,2-Disubstituted alkenes such as vinyl arenes, vinyl silanes, and vinyl boronates are among the most versatile building blocks that can be found in every sector of chemical science. We herein report a noble-metal-free method of accessing such olefins through a photo-induced decarboxylative Heck-type coupling using alkyl carboxylic acids, one of the most ubiquitous building blocks, as the feedstocks. This transformation was achieved in the absence of external oxidants through the synergistic combination of ...

A Randomized Proof-of-Principle Bite Force Study of Two Experimental Denture Adhesives and a Commercially Available Adhesive.

To assess the efficacy of two experimental denture adhesive gels (adhesives 1 and 2) compared to a commercially available denture adhesive cream (positive control) and no adhesive (negative control).

Renovations Needed: the FDA's Floor/Ceiling Framework, Preemption, and the Opioid Epidemic.

The FDA's regulatory framework for pharmaceuticals uses a "floor/ceiling" model: administrative rules set a "floor" of minimum safety, while state tort liability sets a "ceiling" of maximum protection. This model emphasizes pre-market scrutiny but largely relies on the state common law "ceiling" to police the postapproval drug market. As the Supreme Court increasingly holds state tort law preempted by federal administrative standards, the FDA's framework becomes increasingly imbalanced. In the face of a his...

Six-Year Experience in Teaching Pelvic Floor Ultrasonography Using Pelvic Floor Phantoms.

To review our 6-year experience (2009-2015) in teaching three-dimensional pelvic floor ultrasonography workshops that utilized pelvic floor phantoms in the setting of an Objective Structured Assessment of Technical Skills methodology.

Enhancement of the corrosion resistance of epoxy coating by highly stable 3, 4, 9, 10-perylene tetracarboxylic acid functionalized graphene.

In this paper, the 3, 4, 9, 10-perylene tetracarboxylic acid-graphene (PTCA-G) composite was synthesized and the corrosion protection property of epoxy coating-coated Q235 steel containing PTCA-G composite was investigated. The results of Fourier transform infrared spectroscopy (FT-IR) proved that 3, 4, 9, 10-perylene tetracarboxylic acid (PTCA) and graphene (G) were combined via π-π interactions and hydrophobic forces between PTCA and G. The results of electrochemical tests indicated that with additives ...

Adhesion characteristics of porcine pancreatic islets and exocrine tissue to coating materials.

Since the report of the Edmonton protocol in 2000, islet transplantation has been implemented worldwide, and xenotransplantation using porcine islets has also been reported. In addition, many basic experiments using pancreatic islets and exocrine tissue after isolation have been reported. Recently, exocrine cells have been found to be essential for inducing the differentiation of pancreatic islets. Therefore, the importance of the culture conditions for pancreatic tissue when conducting experiments using pa...

Low-adhesive Ethylene Vinyl Alcohol-based Packaging to Xenogeneic Islets Encapsulation for Type 1 Diabetes Treatment.

Transplantation of encapsulated porcine islets is proposed to treat type 1 diabetes. However, envelopment of fibrous tissue and infiltration of immune cells impair islets function and eventually cause implant failure. It is known that hemodialysis using an ethylene vinyl alcohol (EVOH) membrane results in minor tissue responses. Therefore, we hypothesized that using a low adhesive EVOH membrane for encapsulation may prevent host cell accumulation and fibrous capsule formation. In this study, rat islets susp...

Homophilic and Heterophilic Interactions of Type II Cadherins Identify Specificity Groups Underlying Cell-Adhesive Behavior.

Type II cadherins are cell-cell adhesion proteins critical for tissue patterning and neuronal targeting but whose molecular binding code remains poorly understood. Here, we delineate binding preferences for type II cadherin cell-adhesive regions, revealing extensive heterophilic interactions between specific pairs, in addition to homophilic interactions. Three distinct specificity groups emerge from our analysis with members that share highly similar heterophilic binding patterns and favor binding to one an...

What Serum Lipid Abnormalities Are Associated with Adhesive Capsulitis Accompanied by Diabetes?

Adhesive capsulitis is common and can cause stiffness and pain. Diabetes and dyslipidemia are known to be associated with adhesive capsulitis. However, there is no report of any association between serum lipid profiles and adhesive capsulitis accompanied by diabetes.

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