Summary
Poly[2-(carboxymethylthio)ethyl]methylsiloxane-block-polydimethylsiloxane, 1, and poly{[2-(carboxymethylthio)ethyl]methylsiloxane-co-dimethylsiloxane}-block-polydimethylsiloxane, 2, were synthesized by ene-thiol addition of mercaptoacetic acid to respective precopolymers 3 and 4, containing vinyl groups bound to silicon. The precopolymers 3 and 4 were obtained by sequential anionic copolymerization of hexamethylcyclotrisiloxane, D3, with 2,4,6-trimethyl-2,4,6-trivinyl-cyclotrisiloxane, 5, and D3 with 2,4,4,6,6,-pentamethyl-2-vinylcyclotrisiloxane, 6, respectively. The method permits to synthesise the block copolymers with a narrow molecular weight distribution and a high block purity. The ene-thiol addition was performed on free radical route, using AIBN as initiator. The reaction proceeds selectively, leading to the transformation of vinyl groups in the precopolymers into the β-adducts.
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Received: 15 December 1999/Revised version: 25 February 2000/Accepted: 24 March 2000
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Ścibiorek, M., Gladkova, N. & Chojnowski, J. Controlled synthesis of amphiphilic siloxane-siloxane block copolymers with carboxyl functions. Polymer Bulletin 44, 377–384 (2000). https://doi.org/10.1007/s002890070087
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DOI: https://doi.org/10.1007/s002890070087