Aluminum thiolate complexes of porphyrin as excellent initiators for Lewis acid-assisted high-speed living polymerization of methyl methacrylate

1993 ◽  
Vol 26 (6) ◽  
pp. 1238-1243 ◽  
Author(s):  
Takato Adachi ◽  
Hiroshi Sugimoto ◽  
Takuzo Aida ◽  
Shohei Inoue
Keyword(s):  
Methyl Methacrylate ◽  
Lewis Acid ◽  
High Speed ◽  
Living Polymerization ◽  
Thiolate Complexes

Syndiospecific Polymerization of Methyl Methacrylate Catalyzed by Lanthanoid Thiolate Complexes Bearing a Hexamethylphosphoric Triamide Ligand

1996 ◽  
Vol 29 (24) ◽  
pp. 8014-8016 ◽  
Author(s):  
Yuushou Nakayama ◽  
Tetsuya Shibahara ◽  
Hiroki Fukumoto ◽  
Akira Nakamura ◽  
Kazushi Mashima
Keyword(s):  
Methyl Methacrylate ◽  
Hexamethylphosphoric Triamide ◽  
Thiolate Complexes

Controlled and Efficient Polymerization of Methyl Methacrylate Catalyzed by Pyridinylidenaminophosphines Based Lewis Pairs

2021 ◽  
Author(s):  
Fang Ge ◽  
Sun Li ◽  
Zhe Wang ◽  
Wenzhong Zhang ◽  
Xiaowu Wang
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Living Polymerization ◽  
Narrow Molecular Weight Distribution ◽  
Synthetic Approaches ◽  
Lewis Pairs

Developing different synthetic approaches to realize controlled or living polymerization are aspirational to achieve polymers with defined molecular weight, narrow molecular weight distribution and unambiguous structures by polymer chemists. Herein,...

Living polymerization of naturally renewable butyrolactone-based vinylidenes mediated by a frustrated Lewis pair

2021 ◽  
Vol 12 (38) ◽  
pp. 5548-5555
Author(s):  
Yun Bai ◽  
Huaiyu Wang ◽  
Jianghua He ◽  
Yuetao Zhang
Keyword(s):  
Lewis Acid ◽  
Living Polymerization ◽  
Controlled Polymerization ◽  
Frustrated Lewis Pair

The frustrated Lewis pair composed of an organophosphorus(iii) superbase and a bulky organoaluminum Lewis acid promoted the living/controlled polymerization of naturally renewable butyrolactone-based vinylidenes.

Biplane ventriculography in the rat

1986 ◽  
Vol 250 (1) ◽  
pp. H131-H136
Author(s):  
J. L. Heckman ◽  
L. Garvin ◽  
T. Brown ◽  
W. Stevenson-Smith ◽  
W. P. Santamore ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Left Ventricle ◽  
Ejection Fraction ◽  
Stroke Volume ◽  
Methyl Methacrylate ◽  
High Speed ◽  
Water Displacement ◽  
Systolic Volume ◽  
End Diastolic Volume ◽  
End Systolic Volume

Biplane ventriculography was performed on nine intact anesthetized rats. Images of the left ventricle large enough for analysis were obtained by placing the rats close to the radiographic tubes (direct enlargement). Sampling rates, adequate for heart rates of 500 beats/min, were obtained by filming at 500 frames/s. From the digitized silhouettes of the left ventricle the following information was obtained (means +/- SE): end-diastolic volume 0.60 +/- 0.03 ml, end-systolic volume 0.22 +/- 0.02 ml, stroke volume 0.38 +/- 0.02 ml, ejection fraction 0.63 +/- 0.02, cardiac output 118 +/- 7 ml/min, diastolic septolateral dimension 0.41 +/- 0.01 mm, diastolic anteroposterior dimension 0.40 +/- 0.01 mm, diastolic base-to-apex dimension 1.58 +/- 0.04 mm. To determine the accuracy with which the volume of the ventricle could be measured, 11 methyl methacrylate casts of the left ventricle were made. The correlation was high (r = 0.99 +/- 0.02 ml E) between the cast volumes determined by water displacement and by use of two monoplane methods (Simpson's rule of integration and the area-length method applied to the analysis of the anteroposterior films) and a biplane method (area-length). These results demonstrate that it is possible to obtain accurate dimensions and volumes of the rat left ventricle by use of high-speed ventriculography.

scholarly journals Anionic polymerization of (meth)acrylic monomers. 7. Macrocyclic crown ethers as promoters of the living polymerization of methyl methacrylate using monofunctional initiators

1992 ◽  
Vol 25 (18) ◽  
pp. 4457-4463 ◽  
Author(s):  
Sunil K. Varshney ◽  
Robert Jerome ◽  
Philippe Bayard ◽  
Christian Jacobs ◽  
Roger Fayt ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Crown Ethers ◽  
Anionic Polymerization ◽  
Living Polymerization ◽  
Acrylic Monomers
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