Molecular-weight-controlled polymerization of styrene with Mn(acac) 3 in combination with organic halides

2001 ◽  
Vol 46 (5) ◽  
pp. 363-369 ◽  
Author(s):  
Kiyoshi Endo ◽  
Akitoshi Yachi
Keyword(s):  
Molecular Weight ◽  
Controlled Polymerization ◽  
Organic Halides

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.

Nitroxide-mediated polymerization of styrene in the presence of a novel trinitroxide

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Jieai Li ◽  
Zhengbiao Zhang ◽  
Xiulin Zhu ◽  
Jian Zhu ◽  
Zhenping Cheng
Keyword(s):  
Molecular Weight ◽  
Ascorbic Acid ◽  
Linear Structure ◽  
Controlled Polymerization ◽  
First Order ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
First Order Kinetics ◽  
Weight Distributions ◽  
Nitroxide Mediated Polymerization

AbstractThe bulk polymerizations of styrene were performed in the presence of a novel trinitroxide, 2,4,6-tri(4’-oxy-2’,2’,6’,6’-tetramethyl-1’-piperidinyloxy)-1,3,5- triazine (TTPT). Typical features of controlled polymerization were observed, such as the first-order kinetics, the molecular weights (Mn) linearly increased with the conversion, and relatively narrow molecular weight distributions (Mw/Mn). The 1H NMR was used to characterize the obtained polystyrene. The most of obtained polymers at 110 °C were the polymer with two-arm linear structure, not the expected three-arm structure, which was confirmed by the analysis of degradation of obtained polymer by ascorbic acid. A proposed polymerization route of styrene mediated by TTPT was also discussed.

scholarly journals Synthesis of poly(disulfide)s with narrow molecular weight distributions via lactone ring-opening polymerization

2020 ◽  
Vol 11 (19) ◽  
pp. 4882-4886
Author(s):  
Sungwhan Kim ◽  
Kamila I. Wittek ◽  
Yan Lee
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Lactone Ring ◽  
Ring Opening Polymerization ◽  
Controlled Polymerization ◽  
Molecular Weight Distributions ◽  
Weight Distributions

We report the first example of controlled polymerization of poly(disulfide)s with narrow molecular weight distributions.

Sol-Gel Synthetic Model of Bi-Structured Bioactive Nano-Hybrids in TEOS-PDMS System

2006 ◽  
Vol 309-311 ◽  
pp. 557-560
Author(s):  
Kang Yong Lee ◽  
Y.H. Lee ◽  
Hyun Min Kim ◽  
J. Kwak ◽  
H.K. Lee
Keyword(s):  
Molecular Weight ◽  
Cross Section ◽  
Sol Gel ◽  
Condensation Process ◽  
Biological Functions ◽  
Controlled Polymerization ◽  
Nano Composite ◽  
Near Surface ◽  
Synthetic Model ◽  
Silicate Surface

Ceramic-polymer bi-structured nano-hybrid, in which the bioactive silicate surface is nano-hybridized with flexible polymeric bulk, was synthesized in the tetraethoxysilane (TEOS)-polydimethylsiloxane (PDMS) sol-gel system. Different solutions for surface and bulk, whose compositions of TEOS: PDMS were respectively fixed 100: 0 and varied from 50: 50 to 20: 80 with various molecular weight (Mw) of PDMS, were subjected to lamination and controlled polymerization and condensation process, producing a large transparent crack-free monolithic bulk. Characterizations at near-surface cross-section of the bi-structured hybrids revealed that typical bioactive silicate was combined with all types of bulk hybrids regardless of their PDMS contents and Mw without distinct interface, indicating possibility of a novel bioactive nano-composite with enhanced physical and biological functions.

Pd-initiated controlled polymerization of diazoacetates with a bulky substituent: synthesis of well-defined homopolymers and block copolymers with narrow molecular weight distribution from cyclophosphazene-containing diazoacetates

2015 ◽  
Vol 6 (26) ◽  
pp. 4709-4714 ◽  
Author(s):  
Hiroaki Shimomoto ◽  
Hironori Asano ◽  
Tomomichi Itoh ◽  
Eiji Ihara
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Bulky Substituent ◽  
Narrow Molecular Weight Distribution ◽  
Controlled Polymerization

Pd-initiated polymerization of cyclophosphazene-containing diazoacetates proceeded in a controlled manner.

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