Jeff Tonnar - Academia.edu (original) (raw)
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German Research Center for Artificial Intelligence
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Papers by Jeff Tonnar
Macromolecules, 2007
The use of molecular iodine I2 in controlled radical polymerization, called reverse iodine transf... more The use of molecular iodine I2 in controlled radical polymerization, called reverse iodine transfer polymerization, represents a new, straightforward way to prepare controlled macromolecular architectures. Herein, miniemulsion polymerization of styrene in the presence of molecular iodine has been successfully performed. The polymerization of styrene was initiated by bis(4-tert-butylcyclohexyl) peroxydicarbonate at T = 60 °C with dodecyl sulfate sodium salt as surfactant and hexadecane as hydrophobe, yielding a stable and uncolored latex. A certain amount of iodine reacted with water to form hydroiodic acid, leading to an upward deviation of the experimental molecular weight from the theoretical value. However, when the iodine lost by hydrolysis was regenerated by continuous addition of hydrogen peroxide in acidic conditions, it led to the expected molecular weight (e.g., Mn,SEC = 7900 g mol-1, Mw/Mn = 1.46, styrene conversion = 78%, Mn,theoretical = 7900 g mol-1). Hence, the molecul...
Acs Symposium Series, 2009
In recent years, controlled radical polymerization (CRP)(1, 2) has emerged as a unique technique ... more In recent years, controlled radical polymerization (CRP)(1, 2) has emerged as a unique technique to synthesize polymers with controlled architectures, like block, graft or star copolymers. Several techniques have been developed among which nitroxide–mediated ...
Macromolecules, Jul 6, 2007
Reverse iodine transfer polymerization (RITP) represents a new straightforward way to prepare con... more Reverse iodine transfer polymerization (RITP) represents a new straightforward way to prepare controlled macromolecular architectures and relies on the use of molecular iodine (I2) as control agent. In this work, a one-step ab initio emulsion polymerization of n-butyl ...
Macromolecules, 2007
The use of molecular iodine I2 in controlled radical polymerization, called reverse iodine transf... more The use of molecular iodine I2 in controlled radical polymerization, called reverse iodine transfer polymerization, represents a new, straightforward way to prepare controlled macromolecular architectures. Herein, miniemulsion polymerization of styrene in the presence of molecular iodine has been successfully performed. The polymerization of styrene was initiated by bis(4-tert-butylcyclohexyl) peroxydicarbonate at T = 60 °C with dodecyl sulfate sodium salt as surfactant and hexadecane as hydrophobe, yielding a stable and uncolored latex. A certain amount of iodine reacted with water to form hydroiodic acid, leading to an upward deviation of the experimental molecular weight from the theoretical value. However, when the iodine lost by hydrolysis was regenerated by continuous addition of hydrogen peroxide in acidic conditions, it led to the expected molecular weight (e.g., Mn,SEC = 7900 g mol-1, Mw/Mn = 1.46, styrene conversion = 78%, Mn,theoretical = 7900 g mol-1). Hence, the molecul...
Acs Symposium Series, 2009
In recent years, controlled radical polymerization (CRP)(1, 2) has emerged as a unique technique ... more In recent years, controlled radical polymerization (CRP)(1, 2) has emerged as a unique technique to synthesize polymers with controlled architectures, like block, graft or star copolymers. Several techniques have been developed among which nitroxide–mediated ...
Macromolecules, Jul 6, 2007
Reverse iodine transfer polymerization (RITP) represents a new straightforward way to prepare con... more Reverse iodine transfer polymerization (RITP) represents a new straightforward way to prepare controlled macromolecular architectures and relies on the use of molecular iodine (I2) as control agent. In this work, a one-step ab initio emulsion polymerization of n-butyl ...