scholarly journals Polystyrene-b-Poly(2-(Methoxyethoxy)ethyl Methacrylate) Polymerization by Different Controlled Polymerization Mechanisms

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3505
Author(s):  
Dragutin Nedeljkovic
Keyword(s):  
Block Copolymers ◽  
Radical Polymerization ◽  
Anionic Polymerization ◽  
Average Molecular Weight ◽  
Side Reactions ◽  
Controlled Polymerization ◽  
Ethyl Methacrylate ◽  
Structures And Properties ◽  
Important Field ◽  
Atomic Transfer Radical Polymerization

Functional polymers have been an important field of research in recent years. With the development of the controlled polymerization methods, block-copolymers of defined structures and properties could be obtained. In this paper, the possibility of the synthesis of the functional block-copolymer polystyrene-b-poly(2-(methoxyethoxy)ethyl methacrylate) was tested. The target was to prepare the polymer of the number average molecular weight (Mn) of approximately 120 that would contain 20–40% of poly(2-(methoxyethoxy)ethyl methacrylate) by mass and in which the polymer phases would be separated. The polymerization reactions were performed by three different mechanisms for the controlled polymerization—sequential anionic polymerization, atomic transfer radical polymerization and the combination of those two methods. In sequential anionic polymerization and in atomic transfer radical polymerization block-copolymers of the desired composition were obtained but with the Mn significantly lower than desired (up to 30). The polymerization of the block-copolymers of the higher Mn was unsuccessful, and the possible mechanisms for the unwanted side reactions are discussed. It is also concluded that combination of sequential anionic polymerization and atomic transfer radical polymerization is not suitable for this system as polystyrene macroinitiator cannot initiate the polymerization of poly(2-(methoxyethoxy)ethyl methacrylate).

Kinetics of the anionic polymerization of 2-(tertbutyldimethylsilyloxy) ethyl methacrylate

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Thomas Breiner ◽  
Hans-Werner Schmidt ◽  
Axel H. E. Müller
Keyword(s):  
Anionic Polymerization ◽  
Gel Permeation Chromatography ◽  
Butyl Methacrylate ◽  
Side Reactions ◽  
Polymerization Temperature ◽  
Hydroxyethyl Methacrylate ◽  
Controlled Polymerization ◽  
Ethyl Methacrylate ◽  
Reported Data ◽  
Kinetics Of

AbstractThe kinetics and the extent of side reactions of the anionic polymerization of silyl-protected 2-hydroxyethyl methacrylate, 2-(tert-butyldimethylsilyloxy)ethyl methacrylate (TBDMS-HEMA), in tetrahydrofuran (THF) were studied as a function of polymerization temperature. Lithium chloride was added in order to achieve a controlled polymerization. The results of polymerizations at various temperatures are compared with reported data for methyl methacrylate and tert-butyl methacrylate in THF. The activation energy for the studied monomer is lower compared to the other methacrylates. Gel permeation chromatography-viscosity studies show that poly(TBDMS-HEMA) exhibits a more wormlike structure in THF than other polymethacrylates, as indicated by a higher Mark-Houwink exponent, α = 1.025.

scholarly journals Facile Synthesis of Hydrophilic Homo-Polyacrylamides via Cu(0)-Mediated Reversible Deactivation Radical Polymerization

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1947
Author(s):  
Fehaid M. Alsubaie ◽  
Othman Y. Alothman ◽  
Basheer A. Alshammari ◽  
Hassan Fouad
Keyword(s):  
Radical Polymerization ◽  
Water Soluble ◽  
Side Reactions ◽  
Controlled Polymerization ◽  
Molecular Weights ◽  
Linear Evolution ◽  
Copper Bromide ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization ◽  
Experimental Number

In this work, copper-mediated reversible deactivation radical polymerization (RDRP) of homo-polyacrylamides was conducted in aqueous solutions at 0.0 °C. Various degrees of polymerization (DP = 20, 40, 60, and 80) of well-defined water-soluble homopolymers were targeted. In the absence of any significant undesirable side reactions, the dispersity of polydiethylacrylamide (PDEA) and polydimethylacrylamide (PDMA) was narrow under controlled polymerization conditions. To accelerate the polymerization rate, disproportionation of copper bromide in the presence of a suitable ligand was performed prior to polymerization. Full conversion of the monomer was confirmed by nuclear magnetic resonance (NMR) analysis. Additionally, the linear evolution of the polymeric chains was established by narrow molecular weight distributions (MWDs). The values of theoretical and experimental number average molecular weights (Mn) were calculated, revealing a good matching and robustness of the system. The effect of decreasing the reaction temperature on the rate of polymerization was also investigated. At temperatures lower than 0.0 °C, the controlled polymerization and the rate of the process were not affected.

Sign in / Sign up

Export Citation Format

Share Document