Hydrogenated Ring-Opened Polynorbornene:  A Highly Crystalline Atactic Polymer

2005 ◽  
Vol 38 (4) ◽  
pp. 1216-1222 ◽  
Author(s):  
Li-Bong W. Lee ◽  
Richard A. Register
Keyword(s):  
Atactic Polymer

Decomposition of overlapped solid-state carbon-13 NMR resonances belonging to different stereosequences in an atactic polymer

1988 ◽  
Vol 21 (10) ◽  
pp. 2934-2937 ◽  
Author(s):  
Hajime Tanaka ◽  
M. A. Gomez ◽  
A. E. Tonelli
Keyword(s):  
Solid State ◽  
Atactic Polymer

Hydrogenated Ring-Opened Poly(endo-dicyclopentadiene)s Made via Stereoselective ROMP Catalyzed by Tungsten Complexes:  Crystalline Tactic Polymers and Amorphous Atactic Polymer

2006 ◽  
Vol 39 (14) ◽  
pp. 4663-4670 ◽  
Author(s):  
Shigetaka Hayano ◽  
Yoshihisa Takeyama ◽  
Yasuo Tsunogae ◽  
Ichiro Igarashi
Keyword(s):  
Tungsten Complexes ◽  
Atactic Polymer

Depletion effect on partial organization of atactic polymer chain segments in microcells

2003 ◽  
Vol 11 (2) ◽  
pp. 111-115 ◽  
Author(s):  
D. Zhou ◽  
G. Xue ◽  
L. Li ◽  
J. Chen ◽  
Z. Wang
Keyword(s):  
Polymer Chain ◽  
Depletion Effect ◽  
Partial Organization ◽  
Atactic Polymer

Atactic Polymer

2016 ◽  
Author(s):  
A. D. Jenkins ◽  
P. Kratochvĺl ◽  
R. F. T. Stepto ◽  
U. W. Suter
Keyword(s):  
Atactic Polymer

Study of tacticity and thermal rearrangement of low molecular weight 1,2- polybutadiene by NMR

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Farshid Ziaee ◽  
Hamid Salehi Mobarakeh ◽  
Mehdi Nekoomanesh ◽  
Hassan Arabi
Keyword(s):  
Double Bond ◽  
Theoretical Calculations ◽  
Group Formation ◽  
Methine Carbon ◽  
Order Markov Chain ◽  
Probable Reaction ◽  
Cis And Trans ◽  
First Time ◽  
Atactic Polymer ◽  
Good Agreement

AbstractLow molecular wieght 1,2-polybutadiene (Aldrich) tacticity was determined by 13CNMR (100.6 MHz). It was found that the olefinic methylene carbon has the highest splitting and a combination of pentad and heptad sequences was determined which is in agreement with the theoretical calculations. For the first time aliphatic methine carbon assignment of 1,2-polybutadiene was performed. Furthermore, olefinic methine carbon assignment was also performed and the results were compared with the theoretical calculations. For all carbons Bernoullian and first-order Markov-chain propagation statistics were used to fit the experimental data and a good agreement was obtained indicating an atactic polymer (Pm= 0.467). It was shown that the most probable reaction before gelation which happens by heating the polymer under vacuum at 250°C, is crosslinking accompanied with methyl group formation. The decrease in double bond intensity of the pendant group together with constant cis and trans double bond intensities were observed. During heating the syndiotactic triad sequences are consumed indicating that no cyclization has happened.

Sd-5.14 Atactic Polymer

2021 ◽  
Author(s):  
Christopher M. Fellows ◽  
Karl-Heinz Hellwich ◽  
Stefano V. Meille ◽  
Graeme Moad ◽  
Tamaki Nakano ◽  
...  
Keyword(s):  
Atactic Polymer

Rapid and controlled synthesis of hydrophobic polyethers by monomer activation

2012 ◽  
Vol 84 (10) ◽  
pp. 2103-2111 ◽  
Author(s):  
Matthieu Gervais ◽  
Anne-Laure Brocas ◽  
Alain Deffieux ◽  
Emmanuel Ibarboure ◽  
Stephane Carlotti
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Mass Distribution ◽  
Anionic Polymerization ◽  
Molar Mass ◽  
Side Chain ◽  
Controlled Synthesis ◽  
Scanning Calorimetry ◽  
Atactic Polymer ◽  
C Nmr

A series of polyethers was prepared by monomer-activated anionic polymerization. The combination of an ammonium salt with triisobutylaluminum allowed the polymerization of epoxides containing various aliphatic side chains (1,2-butene oxide (BO), 1,2-hexene oxide (HO), and 1,2-octadecene oxide (ODO)) or a fluorinated group (3,3,3-trifluoro-1,2-epoxypropane (TFEP)). Polymers of molar masses up to 35 000 g/mol with relatively narrow molar mass distribution could be synthesized. Polymer structures were analyzed by 13C NMR, and the thermal behavior was studied by differential scanning calorimetry (DSC). The evolution of hydrophobicity was investigated according to the length and composition of the side chain. Using a long aliphatic side-chain epoxide (C16) imparted crystallinity to the resulting atactic polymer.

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