59990-87-3

Upstream product

• 23783-42-8 tetraethylene glycol monomethyl ether 
• 1592-20-7 4-Vinylbenzyl chloride 
• 62921-74-8 2-(2-(2-methoxyethoxy)ethoxy)ethyl p-toluenesulfonate 
• 112-35-6 triethylene glucol monomethyl ether 

Relevant academic research and scientific papers

Temperature-induced phase-transitions of methoxyoligo(oxyethylene) styrene-based block copolymers in aqueous solution

Novel well-defined diblock copolymers based upon styrene substituted with pendant methoxyoligo(oxyethylene) groups (4-CH3O(EO)4St, TrEGS) were prepared by sequential atom transfer radical polymerization. Polystyrene (PS) was synthesi

Synthesis of thermosensitive water-soluble polystyrenics with pendant methoxyoligo(ethylene glycol) groups by nitroxide-mediated radical polymerization

Nitroxide-mediated radical polymerizations of 4-vinylbenzyl methoxytris(oxyethylene) ether (TEGSt), 4-vinylbenzyl methoxytetrakis(oxyethylene) ether (TrEGSt), and 4-vinylbenzyl methoxypentakis-(oxyethylene) ether (PEGSt) were carried out at 120°C using 2,2,5-trimethyl-3-(1-phenylethoxy)-4-phenyl-3-azahexane as initiator. Kinetics study and gel permeation chromatography analysis showed that the polymerizations were living processes yielding polymers with controlled molecular weights and narrow molecular weight distributions. The polymers can be dissolved in water forming transparent solutions and undergo phase transitions when the temperature is above a critical point. The cloud points of the homopolymers of TEGSt, TrEGSt, and PEGSt were around 13, 39, and 55°C, respectively, which were also supported by variable temperature 1H NMR spectroscopy analysis. The high level of alkoxyamine chain end retention allowed the synthesis of diblock copolymers with low polydispersities (1H NMR studies indicated that the diblock copolymers undergo phase transition in water at a temperature between the cloud points of the two corresponding homopolymers.