scholarly journals Transition-metal-free controlled polymerization for poly(p-aryleneethynylene)s

2015 ◽  
Vol 6 (1) ◽  
pp. 492-496 ◽  
Author(s):  
Takanobu Sanji ◽  
Asahi Motoshige ◽  
Hideaki Komiyama ◽  
Junko Kakinuma ◽  
Rie Ushikubo ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Transition Metal ◽  
High Molecular Weight ◽  
Catalytic Amount ◽  
Chain Growth ◽  
Controlled Polymerization ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer ◽  
Metal Free ◽  
A Chain

A catalytic amount of fluoride anions promoted the polymerization of 1-pentafluorophenyl-4-[(trimethylsilyl)ethynyl]benzene, providing a high-molecular-weight polymer in a chain-growth-like manner.

VISCOUS FINGERING PATTERNS IN HIGH MOLECULAR WEIGHT POLYMER SOLUTIONS

Fractals ◽  
1996 ◽  
Vol 04 (02) ◽  
pp. 181-185 ◽  
Author(s):  
MASAMI KAWAGUCHI ◽  
KYOKO MAKINO ◽  
TADAYA KATO
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polymer Solutions ◽  
Methyl Cellulose ◽  
Injection Pressure ◽  
Viscous Fingering ◽  
Chain Entanglement ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer ◽  
A Chain

Characteristics of viscous fingering patterns in polymer solutions were investigated by introducing air into a radial Hele-Shaw cell, in which high molecular weight Hydroxypropyl Methyl Cellulose (HPMC) solution was placed. HPMC chains form a chain entanglement easily, which leads to an increase in elasticity. The resulting patterns showed a drastic morphological change from highly branched patterns to tip-splitting patterns to skewering patterns, with an increase in injection pressure. Such a crossover in the fingering patterns could be well correlated with the characteristic quantities of pattern growth, such as the finger width and tip velocity.

Intrinsic viscoelasticity in thin high-molecular-weight polymer films

2014 ◽  
Vol 89 (6) ◽  
Author(s):  
Xiaoyuan Sheng ◽  
Frédéric Wintzenrieth ◽  
Katherine R. Thomas ◽  
Ullrich Steiner
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polymer Films ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer

Structural studies of the capsular polysaccharide from Haemophilus pleuropneumoniae serotype 2

1987 ◽  
Vol 65 (5) ◽  
pp. 414-422 ◽  
Author(s):  
Eleonora Altman ◽  
Jean-Robert Brisson ◽  
Malcolm B. Perry
Keyword(s):  
Molecular Weight ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Molecular Weight ◽  
Capsular Polysaccharide ◽  
Structural Studies ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer ◽  
Structure Formula ◽  
Nuclear Magnetic

The capsular polysaccharide of Haemophilus pleuropneumoniae serotype 2 (ATCC 27089) is composed of D-glucose (two parts), D-galactose (one part), glycerol (one part), and phosphate (one part). Hydrolysis, dephosphorylation, methylation, enzymic studies, and 1H and 13C nuclear magnetic resonance experiments showed that the polysaccharide is a high molecular weight polymer of a tetrasaccharide repeating units, linked by monophosphate diester and having the following structure:[Formula: see text]

scholarly journals Antigen valence determines the binding of nominal antigen to cytolytic T cell clones.

1985 ◽  
Vol 162 (2) ◽  
pp. 768-773 ◽  
Author(s):  
R F Siliciano ◽  
R M Colello ◽  
A D Keegan ◽  
R Z Dintzis ◽  
H M Dintzis ◽  
...  
Keyword(s):  
Molecular Weight ◽  
T Cell ◽  
High Molecular Weight ◽  
Cytotoxic T Cell ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer ◽  
T Cell Clones ◽  
Cell Clones ◽  
Nominal Antigen ◽  
Epitope Density

We have shown that cytotoxic T cell clones specific for the nominal antigen FL will bind high molecular weight (600,000 to 2,000,000) polyacrylamide and Ficoll polymers conjugated with 200-600 FL groups per molecule. Low molecular weight polymers (40,000) with the same epitope density did not give stable binding. A high molecular weight polymer with a lower epitope density also failed to bind. Taken together, these results suggest that a substantial degree of multivalence is a necessary factor in the stable binding of nominal antigen to T cell clones.

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