TY  - JOUR
A1  - Strehmel, Veronika
A1  - Kraudelt, Heide
A1  - Wetzel, Hendrik
A1  - Gornitz, Eckhard
A1  - Laschewsky, André
T1  - Free radical polymerization of methacrylates in ionic liquids
Y1  - 2004
SN  - 0065-7727
ER  - 
TY  - JOUR
A1  - Strehmel, Veronika
A1  - Laschewsky, André
A1  - Wetzel, Hendrik
A1  - Gornitz, Eckhard
T1  - Free radical polymerization of n-butyl methacrylate in ionic liquids
N2  - Ionic liquids based on imidazolium, pyridinium, and alkylammonium salts were investigated as solvents in free radical polymerization of the model monomer n-butyl methacrylate. The properties of the ionic liquids were systematically varied by changing the length of the alkyl substituents on the cations, and by employing different anions such as tetrafluoroborate, hexafluorophosphate, tosylate, triflate, alkyl sulfates and dimethyl phosphate. Results were compared to analogous polymerizations in toluene and in bulk. The solvents have no detectable influence on polymer tacticity. However, the molar masses obtained and the degree of polymerization, respectively, are very sensitive to the choice of the solvent. The degrees of polymerization are significantly higher when polymerizations were carried out in ionic liquids compared to polymerization in toluene, and can even exceed the values obtained by bulk polymerization. Imidazolium salts unsubstituted at C-2 result in an increase in the degree of polymerization of the poly(butyl methacrylate) with increasing viscosity of these ionic liquids. Methyl substitution at C-2 of the imidazolium ion results in an increase in the viscosity of the ionic liquid and in a viscosity independent degree of polymerization of the poly(butyl methacrylate). Ionic liquids based on imidazolium salts seem preferable over pyridinium and alkylammonium salts because of the higher degree of polymerization of the poly(butyl methacrylate)s obtained in the imidazolium salts. The glass transition temperatures and thermal stabilities are higher for poly(butyl methacrylate)s synthesized in the ionic liquids compared to the polymer made in toluene
Y1  - 2006
UR  - http://pubs.acs.org/doi/full/10.1021/ma0516945
U6  - https://doi.org/10.1021/Ma0516945
ER  - 
TY  - JOUR
A1  - Strehmel, Veronika
A1  - Kraudelt, Heide
A1  - Wetzel, Hendrik
A1  - Görnitz, Eckhard
A1  - Laschewsky, André
T1  - Free radical polymerization of methacrylates in ionic liquids
Y1  - 2004
ER  -