Antifouling behavior of self-renewal acrylate boron polymers with pyridine-diphenylborane side chains

2018 ◽  
Vol 42 (24) ◽  
pp. 19908-19916 ◽  
Author(s):  
Yakun Li ◽  
Rongrong Chen ◽  
YanHua Feng ◽  
Lianhe Liu ◽  
Xun Sun ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Side Chains ◽  
Self Renewal ◽  
Boron Polymers ◽  
Hydrolysis Of

The environmentally friendly polymers showed excellent antifouling performances in raft tests by the hydrolysis of diphenyl borane pyridine side groups.

STUDIES ON REACTIONS RELATING TO CARBOHYDRATES AND POLYSACCHARIDES: LIII. STRUCTURE OF THE DEXTRAN SYNTHESIZED BY THE ACTION OF LEUCONOSTOC MESENTERIOIDES ON SUCROSE

1937 ◽  
Vol 15b (11) ◽  
pp. 486-497 ◽  
Author(s):  
Frances L. Fowler ◽  
Irene K. Buckland ◽  
Fritz Brauns ◽  
Harold Hibbert
Keyword(s):  
Hydrochloric Acid ◽  
Linear Chain ◽  
Chemical Investigation ◽  
Side Chain ◽  
Side Chains ◽  
Methyl Glucoside ◽  
Antigenic Properties ◽  
Hydrolysis Of

The dextran synthesized from sucrose by the action of one strain of Leuconostoc mesenterioides has been subjected to chemical investigation. The polysaccharide has been hydrolyzed to glucose. The triacetate, tribenzoate, and trimethyl derivative (all calculated on a glucose anhydride unit) have been prepared. Hydrolysis of trimethyl dextran by the action of methanol-hydrochloric acid yielded dimethyl, trimethyl, and tetramethyl methyl glucosides in the ratio of 1: 3: 1. The products of hydrolysis have been identified as 2,3-dimethyl methyl glucoside, 2,3,4-trimethyl methyl glucoside, and 2,3,4,6-tetramethyl methyl glucoside.The results indicate that dextran is a polymer of a pentaglucopyranose anhydride. One of the glucopyranose units is attached as a side chain, the remaining four being most probably connected in linear chain union. Three of the linkages between building units are of the 1,6 type, while the remaining two are either 1,4 or 1,6.The antigenic properties shown by dextran are probably a result of the presence of the glucose side chains.

Triazine Monomers and Their Adhesion to Dentin

1986 ◽  
Vol 65 (12) ◽  
pp. 1402-1405 ◽  
Author(s):  
C.H. Lee ◽  
X.Q. Liu ◽  
X.Q. Gong
Keyword(s):  
Mass Spectrometry ◽  
Methyl Methacrylate ◽  
Adhesive Strength ◽  
Aprotic Solvent ◽  
Amino Derivative ◽  
Side Chains ◽  
Chlorine Atoms ◽  
Bonding Agents ◽  
Oh Groups ◽  
Hydrolysis Of

A series of 4,6-dichloro-1,3,5-triazines [e.g., 2-allylamino-(ADT), diallylamino-(DADT), 2-N-p-allyloxyphenylamino-, 2-N-allyl-N-phenylamino-, and 2-N-allyl-N-p-tolylamino-4,6-dichloro-1,3,5-triazine] was synthesized and characterized by IR, NMR, and mass spectrometry. These monomers have chlorine atoms that can react with NH2 or OH groups and double bonds capable of copolymerization. Aniline reacted readily with ADT and DADT, ethanol reacted with ADT, but acetone, H2O, and DMF did not react with either triazine. It appears that ADT or DADT will react with dentinal collagen through NH2 or OH groups in the peptide side-chains. An aprotic solvent should be used for ADT or DADT, but absolute dryness in clinical usage is not essential because of the slow hydrolysis of ADT and DADT. Stability of the N-di-substituted amino derivative (DADT) is greater than that of the mono-substituted compound (ADT), which may isomerize. ADT and methyl methacrylate were copolymerized at 37°C with amine-peroxide. ADT solutions enhanced the adhesive strength of restorative resin to dentin. Thus, monomers such as ADT and DADT appear to be promising dentin-bonding agents.

Chemistry of pyrrolic compounds. XXVII. Some aspects of the mass spectra and chemistry of meso-substituted porphyrins

1974 ◽  
Vol 27 (5) ◽  
pp. 1103 ◽  
Author(s):  
PS Clezy ◽  
Cl Lim ◽  
JS Shannon
Keyword(s):  
Thermal Decomposition ◽  
Mass Spectrometer ◽  
Mass Spectra ◽  
Side Chains ◽  
Methyl Radicals ◽  
Porphyrin Derivative ◽  
Acetic Ester ◽  
Hydrolysis Of ◽  
Successive Loss

Characteristic fragmentations have been observed in the mass spectra of some meso-substituted porphyrins, and especially in some meso-oxy derivatives. meso-Substituted octaethylporphyrins generally underwent thermal decomposition in the mass spectrometer; this resulted in the formation of the parent porphyrin from which the successive loss of eight methyl radicals was observed. Attempts to prepare meso-carboxyoctaethylporphyrin by oxidation of the formyl derivative or by hydrolysis of the meso-cyano compound failed. As a by-product of the preparation of meso-cyano- octaethylporphyrin a porphyrin isocyanide was obtained. Some aspects of the chemistry of this novel porphyrin derivative are reported together with the preparation and properties of an oxyporphyrin substituted with acetic ester side chains.

scholarly journals Specificities of haemagglutinating antibodies evoked by members of the cephalosporin C family and benzylpenicillin

1971 ◽  
Vol 123 (2) ◽  
pp. 183-190 ◽  
Author(s):  
J. M. T. Hamilton-Miller ◽  
E. P. Abraham
Keyword(s):  
Chemical Properties ◽  
Red Cells ◽  
Side Chain ◽  
Side Chains ◽  
Cephalosporin C ◽  
Significant Extent ◽  
Hydrolysis Of

1. Antisera have been produced in rabbits to benzylpenicillin and four members of the cephalosporin C family and to conjugates of these substances with bovine γ-globulin. 2. Deacetoxycephalosporin C reacted less readily and deacetylcephalosporin C lactone more readily with bovine γ-globulin than did benzylpenicillin, cephalosporin C or deacetylcephalosporin C. 3. Antisera to free or conjugated benzylpenicillin agglutinated red cells sensitized with a variety of penicillins, but only reacted to a significant extent with cells sensitized with the cephalosporins tested when the latter contained an N-phenylacetyl or chemically related side chain. 4. Antisera to members of the cephalosporin C family agglutinated cells sensitized with these cephalosporins or with penicillin N, but did not react with cephalosporins whose side chains were chemically unrelated to α-aminoadipic acid. 5. Members of the cephalosporin C family and products of hydrolysis of cephalosporin C behaved as hapten inhibitors of antisera to cephalosporin C, but 7-aminocephalosporanic acid was relatively ineffective. 6. These findings are discussed in relation to differences in the chemical properties of penicillins and cephalosporins.

CONSTITUTION OF THREE HEMICELLULOSES FROM THE WOOD OF ENGELMANN SPRUCE (PICEA ENGELMANNI)

1963 ◽  
Vol 41 (6) ◽  
pp. 1389-1395 ◽  
Author(s):  
A. R. Mills ◽  
T. E. Timell
Keyword(s):  
Glucuronic Acid ◽  
Water Soluble ◽  
Partial Hydrolysis ◽  
Side Chains ◽  
Engelmann Spruce ◽  
Linear Framework ◽  
Single Side ◽  
Hydrolysis Of ◽  
Picea Engelmanni

An arabino-4-O-methylglucuronoxylan (10:70:12), a water-soluble galactoglucomannan (1:1:3), and an alkali-soluble galactoglucomannan (0.2:1:3) have been isolated in yields of 8.0, 1.0, and 8.1% from the wood of Engelmann spruce (Picea engelmanni). The xylan consisted of a linear framework of (1 → 4)-linked β-D-xylose residues to which were directly attached single side chains of (1 → 2)-linked 4-O-methyl-α-D-glucuronic acid and (1 → 3)-linked α-L-arabinofuranose residues. The galactoglucomannans were both composed of a backbone of (1 → 4)-linked β-D-mannose and β-D-glucose residues, some of which carried directly attached side chains of (1 → 6)-linked α-D-galactopyranose residues. Partial hydrolysis of the water-soluble galactoglucomannan yielded, among other oligosaccharides, a trisaccharide composed of galactose, glucose, and mannose residues. It is concluded that the main polysaccharides in the wood of Engelmann spruce are the same as those in most other gymnosperms. In the bark of this tree, the water-soluble galactoglucomannan is replaced by one or several polysaccharides of an entirely different composition.

Sign in / Sign up

Export Citation Format

Share Document