Highly ordered high-molecular weight alternating polysilylene copolymer prepared by anionic polymerization of masked disilene

1990 ◽  
Vol 23 (20) ◽  
pp. 4494-4496 ◽  
Author(s):  
Kenkichi Sakamoto ◽  
Masaru Yoshida ◽  
Hideki Sakurai
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Anionic Polymerization

scholarly journals Convenient preparation of high molecular weight poly(dimethylsiloxane) using thermally latent NHC-catalysis: a structure-activity correlation

2015 ◽  
Vol 11 ◽  
pp. 2261-2266 ◽  
Author(s):  
Stefan Naumann ◽  
Johannes Klein ◽  
Dongren Wang ◽  
Michael R Buchmeiser
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Anionic Polymerization ◽  
Heterocyclic Carbenes ◽  
Structure Activity ◽  
Convenient Preparation ◽  
High Molecular Weight Poly

The polymerization of octamethylcyclotetrasiloxane (D4) is investigated using several five-, six- and seven-membered N-heterocyclic carbenes (NHCs). The catalysts are delivered in situ from thermally susceptible CO2 adducts. It is demonstrated that the polymerization can be triggered from a latent state by mild heating, using the highly nucleophilic 1,3,4,5-tetramethylimidazol-2-ylidene as organocatalyst. This way, high molecular weight PDMS is prepared (up to >400 000 g/mol, 1.6 < Ð M < 2.5) in yields >95%, using low catalyst loadings (0.2–0.1 mol %). Furthermore, the results suggest that a nucleophilic, zwitterionic mechanism is in operation, in preference to purely anionic polymerization.

scholarly journals Synthesis of High Molecular Weight Nylon 6 by Anionic Polymerization of ε-Caprolactam

1996 ◽  
Vol 28 (5) ◽  
pp. 446-451 ◽  
Author(s):  
Kazue Ueda ◽  
Kazunobu Yamada ◽  
Makoto Nakai ◽  
Tsunetoshi Matsuda ◽  
Masahiro Hosoda ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Anionic Polymerization ◽  
Nylon 6

scholarly journals Synthesis of High Molecular Weight Nylon 6 by Anionic Polymerization of ε-Caprolactam. Formation of Cyclic Oligomers

1998 ◽  
Vol 30 (3) ◽  
pp. 186-191 ◽  
Author(s):  
Kazue Ueda ◽  
Masahiro Hosoda ◽  
Tsunetoshi Matsuda ◽  
Kazuo Tai
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Anionic Polymerization ◽  
Nylon 6 ◽  
Cyclic Oligomers
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