Hydrolytic degradation of poly(d,l-lactide) as a function of end group: Carboxylic acid vs. hydroxyl

Polymer ◽  
2006 ◽  
Vol 47 (6) ◽  
pp. 1960-1969 ◽  
Author(s):  
Jeffrey S. Wiggins ◽  
Mohammad K. Hassan ◽  
Kenneth A. Mauritz ◽  
Robson F. Storey
Keyword(s):  
Carboxylic Acid ◽  
Hydrolytic Degradation ◽  
End Group

Phase Behavior and Micellar Properties of Carboxylic Acid End Group Modified Pluronic Surfactants

Langmuir ◽  
2007 ◽  
Vol 23 (26) ◽  
pp. 12857-12863 ◽  
Author(s):  
Johan P. A. Custers ◽  
Leo J. P. van den Broeke ◽  
Jos T. F. Keurentjes
Keyword(s):  
Carboxylic Acid ◽  
Phase Behavior ◽  
Micellar Properties ◽  
End Group

Broadband dielectric spectroscopic characterization of the hydrolytic degradation of carboxylic acid-terminated poly(d,l-lactide) materials

Polymer ◽  
2007 ◽  
Vol 48 (7) ◽  
pp. 2022-2029 ◽  
Author(s):  
Mohammad K. Hassan ◽  
Jeffrey S. Wiggins ◽  
Robson F. Storey ◽  
Kenneth A. Mauritz
Keyword(s):  
Carboxylic Acid ◽  
Hydrolytic Degradation ◽  
Spectroscopic Characterization

scholarly journals Influence of cyclodextrin on the solubility of a classically prepared 2-vinylcyclopropane macromonomer in aqueous solution

2012 ◽  
Vol 8 ◽  
pp. 1528-1535 ◽  
Author(s):  
Helmut Ritter ◽  
Jia Cheng ◽  
Monir Tabatabai
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acid ◽  
Graft Copolymer ◽  
Ring Opening ◽  
Main Chain ◽  
Double Bonds ◽  
Radical Ring ◽  
Unsaturated Polymer ◽  
End Group ◽  
Clouding Point

A macromonomer 5 consisting of a polymerizable vinylcyclopropane end group and a poly(N-isopropylacrylamide) (poly(NiPAAm)) chain was obtained from amidation of 1-ethoxycarbonyl-2-vinylcyclopropane-1-carboxylic acid (4) with an amino-terminated poly(NiPAAm) 3 as an example. This macromonomer 5 showed an LCST effect after complexation of the vinyl end group with ß-cyclodextrin in water. Via radical ring-opening copolymerization of 5 and NiPAAm a graft copolymer 8 with a clouding point of 32 °C was synthesized. The branched unsaturated polymer was treated with ozone to cleave the double bonds of the main chain.

End group effect in polymer adsorption: Competitive adsorption of carboxylic acid‐terminated and unfunctionalized polystyrene

1990 ◽  
Vol 92 (11) ◽  
pp. 6970-6971
Author(s):  
Peter Frantz ◽  
Steve Granick ◽  
D. R. Iyengar ◽  
Thomas J. McCarthy
Keyword(s):  
Carboxylic Acid ◽  
Competitive Adsorption ◽  
Polymer Adsorption ◽  
Group Effect ◽  
End Group

Cytotoxicity of the Functionalized Gold and Silver Nanorods

2006 ◽  
Vol 951 ◽  
Author(s):  
Chiung-Wen Kuo ◽  
Jun-Jung Lai Lai ◽  
Peilin Chen
Keyword(s):  
Cell Death ◽  
Carboxylic Acid ◽  
Surface Charge ◽  
Cell Lines ◽  
Surface Functionalization ◽  
Silver Nanorods ◽  
Mtt Assays ◽  
Positively Charged ◽  
End Group

ABSTRACTThe cytotoxicity of various surface functionalized gold and silver nanords was measured by MTT assays for two cell lines, fibroblast and HeLa. It was found that the functionalized nanorods with 200 nm diameter and length up to a few micrometer can be readily internalized by both types of cells regardless of the surface functionalization. However, the cytotoxicity of the nanorods was found to depend on the polarity of the surface charge. The positively charged amino end group on the nanorod surface was found to be the least toxic whereas the negatively charged carboxylic acid end group on the nanorod surface caused lots of cell death. In general, the functionalized nanorods were found to be more toxic than the serum coated nanorods.

(Membrane) Attack of the Killer Radicals

2005 ◽  
Vol 885 ◽  
Author(s):  
Ned Emidio Cipollini
Keyword(s):  
Carboxylic Acid ◽  
Additional Data ◽  
Quantitative Model ◽  
Reaction Scheme ◽  
The Self ◽  
Time Curve ◽  
Cell Testing ◽  
Self Consistency ◽  
Group Concentration ◽  
End Group

ABSTRACTThe conventional Fenton mechanism is reviewed and then slightly modified to incorporate additional data. Following the DuPont attack mechanism closely, we explain why the FER is proportional to the carboxylic acid end-group concentration in Fenton tests. We then make a case that in-cell testing introduces additional decay reactions operating locally in the membrane. These additional reactions explain the shape of the FER vs. time curve and why the FER is nearly independent of the carboxylate end group concentration. A semi-quantitative model is introduced to support the self consistency of the proposed reaction scheme.

Carboxylic acid end group modification of poly(butylene terephalate) in supercritical fluids

Polymer ◽  
2003 ◽  
Vol 44 (8) ◽  
pp. 2201-2211 ◽  
Author(s):  
J.M. de Gooijer ◽  
M. Scheltus ◽  
M.A.G. Jansen ◽  
C.E. Koning
Keyword(s):  
Carboxylic Acid ◽  
Supercritical Fluids ◽  
Group Modification ◽  
End Group Modification ◽  
End Group
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