A Convenient Method for Preparation of Amphiphilic Monomethoxypoly (Ethylene Glycol)–Polystyrene Diblock Copolymer by NMRP Technique

Nitroxide mediated and atom transfer radical graft polymerization of atactic polymers onto syndiotactic polystyrene

“…In a two-neck round-bottom flask equipped with condenser, dropping funnel, gas inlet/outlet, and a magnetic stirrer, 0.051 g (0.33 mmol) of TEMPO-OH that was synthesized by our research group previously (Shoaeifar et al, 2007) was dissolved in anhydrous N,N-dimethylformamide (DMF) (1 ml) and added under N 2 atmosphere to 8.0 mg (0.33 mmol) of hexane-washed NaH (from 60% suspension in oil). The mixture was stirred for 30 minutes, and then 1 g of α-Phenyl-chloroacetylation of sPS was added under N 2 and refluxed for 24 hours.…”

“…In order to exact this control, several methodologies have been developed which reduce radical concentrations and efficiently exchange dormant chains with reactive radical species in order to minimize bimolecular termination reactions. The nature of the dormant chain differentiates these processes, with nitroxidemediated radical polymerization (NMP) (Hawker et al, 2001;Moad et al, 2008;Shoaeifar et al, 2007) exploiting the reversible cleavage of a nitroxide -carbon bond, thiocarbamates supporting a reversible addition -fragmentation chain transfer (RAFT) [Moad et al (2005)] pathway, and ruthenium and copper complexes mediating the exchange of halogen-capped polymer chains through an atom transfer radical polymerization (ATRP) (Matyjaszewski and Xia, 2001;Ouchi et al, 2008;Abbasian et al, 2006;Gheybi et al, 2007;Schellenberg, 2009;Srinate et al, 2009;Abbasian et al, 2007). Together, these processes are termed controlled radical polymerization (CRP) and provide extraordinary control over polymer molecular weight and molecular weight distributions.…”

Application of Stable Radicals as Mediators in Living‐Radical Polymerization

“…260 Amphiphilic diblock copolymers containing segments of monomethoxypoly(ethylene glycol) and polystyrene (MPEG-b-PS) were synthesised using a MPEG-TEMPO macroinitiator. 261 Block copolymers containing methacrylates have also been synthesized by preparing a first block of a random copolymer of MMA with styrene and chain extending this SG1-terminated polymer with either styrene or n-butyl acrylate. 119 Another unique block copolymer was formed by the polymerization of n-butyl acrylate in the presence of SG1, which was then chain extended with a mixture of methyl methacrylate and N, N -dimethyl acrylamide to create a random copolymer as the second block.…”

“…263 Other amphiphilic block copolymers containing segments of monomethoxypoly(ethylene glycol) and polystyrene (MPEG-b-PS) using TEMPO have been reported by Shoaeifar et al . 264 The formation of block copolymers containing protic functionalities has also been accomplished. An amphiphilic block copolymer was synthesized beginning with the polymerization of acrylic acid in the presence of a small amount of styrene to form a SG1-terminated polymer that was then chain extended with styrene.…”

Synthesis and Characterization of Poly Chloromethylstyrene TiO2-Nanocomposite Through a Simple Method via Reversible Addition-Fragmentation Transfer Polymerization

“…The development of CRP permitted to achieve well-defined polymers using a radical process easy to carry out. Various methods for CRP have been proposed; however, the most successful methods include atom transfer radical polymerization (ATRP) [4][5][6][7] , nitroxide mediated polymerization (NMP) [8][9][10][11][12][13][14][15] , and reversible addition-fragmentation transfer (RAFT) polymerization [16][17][18][19] . The emergence of controlled radical polymerization (CRP) techniques, in particular, reversible addition fragmentation chain transfer (RAFT) polymerization [20][21][22] , has allowed for more control over polymer molecular mass.…”