Direct Observation of a Cyclic Vinyl Polymer Prepared by Anionic Polymerization using N ‐Heterocyclic Carbene and Subsequent Ring‐Closure without Highly Diluted Conditions

2020 ◽  
Vol 221 (10) ◽  
pp. 2000004 ◽  
Author(s):  
Keiji Naruse ◽  
Akinori Takasu ◽  
Masahiro Higuchi
Keyword(s):  
Direct Observation ◽  
Anionic Polymerization ◽  
Ring Closure ◽  
Vinyl Polymer

Efficient synthesis of well-defined cyclic polystyrenes using anionic polymerization, silicon chloride linking chemistry and metathesis ring closure

2016 ◽  
Vol 7 (37) ◽  
pp. 5840-5848 ◽  
Author(s):  
Qiming He ◽  
Aleer M. Yol ◽  
Shih-Fan Wang ◽  
Hongwei Ma ◽  
Kai Guo ◽  
...  
Keyword(s):  
Efficient Method ◽  
Anionic Polymerization ◽  
Ring Closure ◽  
Efficient Synthesis

An efficient method for the synthesis of well-defined cyclic polystyrenes using anionic polymerization, silicon chloride linking chemistry, and metathesis ring closure has been developed.

Synthesis of Cyclic Polystyrenes Using Living Anionic Polymerization and Metathesis Ring-Closure

2011 ◽  
Vol 44 (19) ◽  
pp. 7538-7545 ◽  
Author(s):  
Roderic P. Quirk ◽  
Shih-Fan Wang ◽  
Mark D. Foster ◽  
Chrys Wesdemiotis ◽  
Aleer M. Yol
Keyword(s):  
Anionic Polymerization ◽  
Ring Closure ◽  
Living Anionic Polymerization

Synthesis and Isomeric Characterization of Well-Defined 8-Shaped Polystyrene Using Anionic Polymerization, Silicon Chloride Linking Chemistry, and Metathesis Ring Closure

2017 ◽  
Vol 50 (15) ◽  
pp. 5779-5789 ◽  
Author(s):  
Qiming He ◽  
Jialin Mao ◽  
Chrys Wesdemiotis ◽  
Roderic P. Quirk ◽  
Mark D. Foster
Keyword(s):  
Anionic Polymerization ◽  
Ring Closure

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

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