Comparison of the Mayo and Chain Length Distribution Procedures for the Measurement of Chain Transfer Constants

1999 ◽  
Vol 32 (19) ◽  
pp. 6019-6030 ◽  
Author(s):  
Johan P. A. Heuts ◽  
Thomas P. Davis ◽  
Gregory T. Russell
Keyword(s):  
Chain Length ◽  
Chain Transfer ◽  
Length Distribution ◽  
Chain Length Distribution

scholarly journals Fundamentals of reversible addition–fragmentation chain transfer (RAFT)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Catherine L. Moad ◽  
Graeme Moad
Keyword(s):  
Radical Polymerization ◽  
Chain Length ◽  
Molar Mass ◽  
Chain Transfer ◽  
Raft Polymerization ◽  
Length Distribution ◽  
Chain Length Distribution ◽  
Reversible Addition ◽  
Raft Agent ◽  
End Group

Abstract Radical polymerization is transformed into what is known as reversible addition–fragmentation chain transfer (RAFT) polymerization by the addition of a RAFT agent. RAFT polymerization enables the preparation of polymers with predictable molar mass, narrow chain length distribution, high end-group integrity and provides the ability to construct macromolecules with the intricate architectures and composition demanded by modern applications in medicine, electronics and nanotechnology. This paper provides a background to understanding the mechanism of RAFT polymerization and how this technique has evolved.

When Mayo falls short (Ctr ≫ 1): the use of cumulative chain length distribution data in the determination of chain transfer constants (Ctr) for radical polymerizations

2020 ◽  
Vol 11 (26) ◽  
pp. 4281-4289
Author(s):  
Matt K. Donald ◽  
Stefan A. F. Bon
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Chain Length ◽  
Weight Distribution ◽  
Chain Transfer ◽  
Length Distribution ◽  
Distribution Data ◽  
Chain Length Distribution ◽  
Radical Polymerizations

A method to determine chain transfer constants in free radical polymerizations that are >1 using molecular weight distribution data.

scholarly journals Correction: When Mayo falls short (Ctr ≫ 1): the use of cumulative chain length distribution data in the determination of chain transfer constants (Ctr) for radical polymerizations

2021 ◽  
Vol 12 (6) ◽  
pp. 947-947
Author(s):  
Matt K. Donald ◽  
Stefan A. F. Bon
Keyword(s):  
Chain Length ◽  
Chain Transfer ◽  
Length Distribution ◽  
Distribution Data ◽  
Chain Length Distribution ◽  
Radical Polymerizations

Correction for ‘When Mayo falls short (Ctr ≫ 1): the use of cumulative chain length distribution data in the determination of chain transfer constants (Ctr) for radical polymerizations’ by Matt K. Donald and Stefan A. F. Bon, Polym. Chem., 2020, 11, 4281–4289, DOI: 10.1039/D0PY00348D.

Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance

2019 ◽  
Author(s):  
Dennis Bücker ◽  
Annika Sickinger ◽  
Julian D. Ruiz Perez ◽  
Manuel Oestringer ◽  
Stefan Mecking ◽  
...  
Keyword(s):  
Chain Length ◽  
Length Distribution ◽  
Catalyst System ◽  
Chain Conformation ◽  
Controlled Polymerization ◽  
Chain Length Distribution ◽  
Electron Resonance ◽  
Double Electron ◽  
The Individual ◽  
Double Electron Electron Resonance

Synthetic polymers are mixtures of different length chains, and their chain length and chain conformation is often experimentally characterized by ensemble averages. We demonstrate that Double-Electron-Electron-Resonance (DEER) spectroscopy can reveal the chain length distribution, and chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura Coupling Polymerization (cSMCP). The required spin-labeled chain ends were introduced efficiently via a TEMPO-substituted initiator and chain terminating agent, respectively, with an in situ catalyst system. Individual precise chain length oligomers as reference materials were obtained by a stepwise approach. Chain length distribution, chain conformation and flexibility can also be accessed within poly(fluorene) nanoparticles.

scholarly journals Miniaturized Analysis of Amylopectin Chain Length Distribution by Fluorescence-Assisted Capillary Electrophoresis (FACE) down to Single Starch Granules

2021 ◽  
Author(s):  
amandine pruvost ◽  
stanislas helle ◽  
nicolas szydlowski ◽  
Christian ROLANDO
Keyword(s):  
Capillary Electrophoresis ◽  
Chain Length ◽  
Solid Phase ◽  
Potato Starch ◽  
Relative Proportion ◽  
Length Distribution ◽  
Fluorescence Analysis ◽  
Starch Granules ◽  
Chain Length Distribution ◽  
Single Granule

In the present work, we developed a miniaturized method for determining amylopectin chain length distribution (CLD) by fluorescence-assisted capillary electrophoresis (FACE). The method relies on single granule entrapping into capillaries followed by direct starch gelatinization and amylopectin debranching on carbograph-based solid phase extraction (SPE) cartridges. Sample desalting on HypersepTM tips following APTS-labelling and the use of nanovials allowed for the fluorescence analysis of weakly diluted samples. Consequently, method sensitivity was improved by 500-fold which is compatible with the analysis of single potato starch granules. The method was implemented to determine CLD profiles of single starch granules ranging from 50 to 100 µm in diameter. In these experiments, the relative proportion of starch glucans of up to 30 degrees of polymerization (DP) could be quantified.

Chain Length Distribution of Amylopectins of Double- and Triple-Mutants Containing the Waxy Gene in the Inbred Oh43 Maize Background

1987 ◽  
Vol 39 (9) ◽  
pp. 295-298 ◽  
Author(s):  
H. Fuwa ◽  
D. V. Glover ◽  
K. Miyaura ◽  
N. Inouchi ◽  
Y. Konishi ◽  
...  
Keyword(s):  
Chain Length ◽  
Length Distribution ◽  
Waxy Gene ◽  
Chain Length Distribution
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