When the amount of diisocyanate of the PU/VERH SIN systems exactly corresponds to the hydroxyl
groups of polyether polyol and chain extender of the PU phase, by neglecting the pendent hydroxyl
groups of VERH, the tensile strength for both PU/VERH SINs containing Arco-5613 or GH-330E as the soft polyol decreases with increasing PU content.
In order to test the change of phenolic hydroxyl
content, we measured the UV absorption of the neutral solution against the one of alkaline solutions for getting the UV difference spectra, and we defined [DELTA][[DELTA].
Modification rate can be to a certain extent affected by three kinds of hydroxyl
position on the surface (isolated hydroxyl
, ortho-dihydroxy and double hydroxyl
) because of the hydrogen bond association in orthodihydroxy and steric hindrance of double hydroxyl
8) used statistical methods to develop hydroxyl
functional acrylic emulsions and to prepare 2K WBPU coatings for use in kitchen cabinet and office furniture applications.
radical scavenging as measured by degradation of the deoxy-D-ribose method was performed on the solutions of CDW/CDF1 to CDF4 (3-300 [micro]g/ml) as described by Kunchandy and Rao (1989).
In view of the over-production of nitrous acid thus highlighted by researchers, this phenomenon might be responsible for the production of half of all hydroxyl
The inner layer comprises a thermoplastic polyurethane resin material with at least one ethylenically unsaturated bond in its backbone, at least one pendent hydroxyl
group, or a combination thereof, wherein an interfacial chemical bond is formed between at least one of an unreacted functional group of at least one light-stable aliphatic thermoplastic polyurethane and an unreacted functional group of at least one heat activated crosslinking monomer or agent of the outer layer and at least one of at least one ethylenically unsaturated bond and at least one pendent hydroxyl
group of the inner layer.
Prior to the crystal structure determination, molecular modeling indicated that the [beta]Thr67 side chain hydroxyl
group in the distal beta-heme pocket forms a hydrogen bond with the backbone carbonyl of [beta]His63 and is within hydrogen-bonding distance of the ND atom of [beta]His63.
A measurement of this is known as the hydroxyl
value, which is a measure of all hydroxyl
groups in the form of hydroxy fatty acids, oxidized fatty acids, etc, contained in a fat or oil.
It is this part of the spectrum that has the energy to initiate photochemical reactions and produce hydroxyl
radicals,' Monks says.
Ozone in the lower atmosphere often reacts with water to form hydroxyl
After the notion of ionic dissociation was established by Arrhenius, an acid came to be defined as a substance that split up to yield hydrogen ions, while a base was one that split up to yield hydroxyl