Synthesis of Poly(methacrylic acid)-block-Polystyrene Diblock Copolymers at High Solid Contents via RAFT Emulsion Polymerization

Polymers

Iklima Oral¹  Larissa Grossmann¹  Elena Fedorenko¹  Volker Abetz¹  Jana Struck¹ 

[1]Institute of Physical Chemistry, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany

关键词: reversible-addition-fragmentation chain transfer;    high solid content;    polymerization-induced self-assembly;    emulsion polymerization;    polystyrene;    poly(methacrylic acid);   

DOI  :  10.3390/polym13213675

来源: DOAJ

【 摘 要 】

The combination of polymerization–induced self-assembly (PISA) and reversible–addition fragmentation chain transfer (RAFT) emulsion polymerization offers a powerful technique to synthesize diblock copolymers and polymeric nanoparticles in a controlled manner. The RAFT emulsion diblock copolymerization of styrene and methacrylic acid (MAA) by using a trithiocarbonate as surfactant and RAFT agent was investigated. The Z-group of the RAFT agent was modified with a propyl-, butyl- and dodecyl- sidechain, increasing the hydrophobicity of the RAFT agent to offer well-controlled polymerization of poly(methacrylic acid)-block-polystyrene (PMAA-b-PS) diblock copolymers at high solid contents between 30–50 wt% in water. The kinetic data of the PMAA homopolymerization with the three different RAFT agents for various solvents was investigated as well as the RAFT emulsion polymerization of the diblock copolymers in pure water. While the polymerization of PMAA-b-PS with a propyl terminus as a Z-group suffered from slow polymerization rates at solid contents above 30 wt%, the polymerization with a dodecyl sidechain as a Z-group led to full conversion within 2 h, narrow molar mass distributions and all that at a remarkable solid content of up to 50 wt%.

【 授权许可】

Unknown