Molecular weight polydispersity effects on the viscoelasticity of entangled linear polymers

1991 ◽  
Vol 24 (8) ◽  
pp. 1762-1767 ◽  
Author(s):  
Christos Tsenoglou
Keyword(s):  
Molecular Weight ◽  
Linear Polymers

Processability predictions for mechanically recycled blends of linear polymers

2020 ◽  
Vol 40 (9) ◽  
pp. 771-781
Author(s):  
Janne van Gisbergen ◽  
Jaap den Doelder
Keyword(s):  
Molecular Weight ◽  
Circular Economy ◽  
Melt Flow Index ◽  
Building Blocks ◽  
Experimental Designs ◽  
New Method ◽  
Flow Index ◽  
Linear Polymers ◽  
Combined Method

AbstractRecycling of thermoplastic polymers is an important element of sustainable circular economy practices. The quality of mechanically recycled polymers is a concern. A method is presented to predict the structure and processability of recycled blends of polymers based on processability knowledge of their virgin precursor components. Blending rules at molecular weight distribution level are well established and form the foundation of the new method. Two essential fundamental building blocks are combined with this foundation. First, component and blend structure are related to viscosity via tube theories. Second, viscosity is related to melt flow index via a continuum mechanics approach. Emulator equations are built based on virtual experimental designs for fast forward and reverse calculations directly relating structure to viscosity and processability. The new combined method is compared with empirical blend rules, and shows important similarities and also clear quantitative differences. Finally, the new method is applied to practical recycling quality challenges.

Synthesis and Properties of Regular Star Polybutadienes with 32 Arms

1992 ◽  
Vol 65 (2) ◽  
pp. 303-314 ◽  
Author(s):  
L-L. Zhou ◽  
N. Hadjichristidis ◽  
P. M. Toporowski ◽  
J. Roovers
Keyword(s):  
Molecular Weight ◽  
Coupling Agent ◽  
Hard Sphere ◽  
Star Polymers ◽  
Radius Of Gyration ◽  
Linear Polymers ◽  
Solution Properties ◽  
Mean Square ◽  
Dilute Solution ◽  
Dilute Solution Properties

Abstract A dendrimer carbosilane containing 32 Si—Cl bonds in the perimeter has been prepared and has been used as a coupling agent to prepare 32-arm star polybutadienes. The dilute-solution properties 〈RG2〉, A2, [η], and D0 have been measured in one good solvent and in one ¸ -solvent. The dimensions of the 32-arm star polymers are compared with those of linear polymers at constant molecular weight. It is shown that the 32-arm star polybutadiene has the characteristic properties of a hard-sphere molecule in dilute solution. The equivalent hard-sphere radii calculated from A2, D0 and [η] are identical and 1.29 times larger than the root mean-square radius of gyration. The Daoud—Cotton scaling model for stars is also tested.

scholarly journals Anti-Inflammatory Properties of Dendrimersper se

2011 ◽  
Vol 11 ◽  
pp. 1367-1382 ◽  
Author(s):  
Myriam Hayder ◽  
Séverine Fruchon ◽  
Jean-Jacques Fournié ◽  
Mary Poupot ◽  
Rémy Poupot
Keyword(s):  
Molecular Weight ◽  
Linear Polymers ◽  
Inflammatory Disorders ◽  
Drug Candidates ◽  
The Past ◽  
Anti Inflammatory

Dendrimers are polybranched and polyfunctionalized tree-like polymers. Unlike linear polymers, they have perfectly defined structure and molecular weight, due to their iterative step-by-step synthesis. Their multivalent structure and supramolecular properties have made them attractive nanotools for applications, particularly in biology and medicine. Among the different biological and medical properties of dendrimers that have been developed over the past decades, the anti-inflammatory properties of several groups of dendrimers are the most recently discovered. Thereof, dendrimers emerge as promising, although heretical, drug candidates for the treatment of still-uncured chronic inflammatory disorders. This mini-review is based on the five main scientific articles giving an overview of what can be the spectrum of anti-inflammatory characteristics displayed by dendrimers.

A new absolute molecular weight method for linear polymers

1958 ◽  
Vol 32 (124) ◽  
pp. 177-186 ◽  
Author(s):  
F. Bueche ◽  
S. W. Harding
Keyword(s):  
Molecular Weight ◽  
Linear Polymers ◽  
Weight Method

New Absolute Molecular Weight Method for Linear Polymers

1959 ◽  
Vol 32 (1) ◽  
pp. 99-106
Author(s):  
F. Bueche ◽  
S. W. Harding
Keyword(s):  
Molecular Weight ◽  
Linear Polymers ◽  
Weight Method

scholarly journals Determining the Dilution Exponent for Entangled 1,4-Polybutadienes Using Blends of Near-Monodisperse Star with Unentangled, Low Molecular Weight Linear Polymers

2019 ◽  
Vol 52 (4) ◽  
pp. 1757-1771 ◽  
Author(s):  
Ryan Hall ◽  
Beom-Goo Kang ◽  
Sanghoon Lee ◽  
Taihyun Chang ◽  
David C. Venerus ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Linear Polymers

Estimation of the molecular weight of linear polymers by the thermomechanical method

1965 ◽  
Vol 7 (2) ◽  
pp. 327-334
Author(s):  
B.Ya. Teiltel'baum ◽  
E.F. Gubanov ◽  
E.P. Adamovich ◽  
M.P. Dianov ◽  
N.N. Makarova
Keyword(s):  
Molecular Weight ◽  
Linear Polymers ◽  
Thermomechanical Method
Sign in / Sign up

Export Citation Format

Share Document