Synthesis of poly(octadecyl acrylate‐b‐styrene‐b‐octadecyl acrylate) triblock copolymer by atom transfer radical polymerization

Abstract

ABSTRACT:The synthesis of triblock copolymer poly(octadecyl acrylate-b-styrene-b-octadecyl acrylate), using atom transfer radical polymerization (ATRP), is reported. The copolymers were prepared in two steps. First, polystyrene was synthesized by ATRP using ␣,␣Ј-dichlorop-xylene/CuBr/bpy as the initiating system; Second, polystyrene was further used as macroinitiator for the ATRP of octadecyl acrylate to prepare ABA triblock copolymers in the presence of FeCl 2 ⅐4H 2 O/PPh 3 in toluene. Polymers with controlled molecular weight (M n ϭ 17,000 -23,400) and low polydispersity index value (1.33-1.44) were obtained. The relationship between molecular weight versus conversion showed a straight line. The effect of reaction temperature on polymerization was also investigated, showing a faster polymerization rate under higher temperature. The copolymers were characterized by FTIR, 1 H-NMR, DSC, and GPC and the crystallization behavior of the copolymers was also studied.

Semicrystalline Macromolecular Design by Nitroxide‐Mediated Polymerization

“…For the calculation of the degree of crystallinity (x C ) of the different polymers containing different concentrations of ODA units, we have used Equation (1) described by Zhu et al: [24] x…”

“…[18,[21][22][23] Zhu et al have also described the preparation of a poly(octadecyl acrylate)-block-poly(styrene)-block-poly(octadecyl acrylate) (PODA-b-PS-b-PODA) triblock copolymer by ATRP. [24] However, Holder et al reported the optimization of the synthesis of PODA and the synthesis of comb-like amphiphilic diblock copolymers, poly(octadecyl acrylate)-block-poly(ethylene glycol…”

Block copolymer of trans‐polyisoprene and urethane segment: Shape memory effects

“…Their shape memory effect originates from thermal transition of polymer chains and from morphology of polymer systems. [1][2][3][4] In block copolymers with the shape memory effect, domains of the switching segments are subjected to softening and hardening, upon heating above transition temperature and cooling below this temperature. The driving force of shape recovery is the elastic strain generated during the thermal deformation.…”

Synthesis of Poly(lauryl acrylate) by Single‐Electron Transfer/Degenerative Chain Transfer Living Radical Polymerization Catalyzed by Na2S2O4 in Water

“…The structural features of the macromolecules play an important role in the performance of the final materials. [6] Therefore, any strategy that allows the synthesis of well-defined macrostructures is essential to optimize the properties of the materials.…”