Anionic copolymerization of hexanelactam with functionalized polyisoprene

Abstract

Block copolymers of the A-B-C-B-A type were synthesized for the first time via the activated anionic polymerization of hexanelactam (HL) with Na-HL as an initiator and macroactivators [or polymeric activators (PACs)] as elastificators for nylon-6. The PACs were prepared by the functionalization of telechelic hydroxylterminated poly(ethylene oxide)-polyisoprene-poly(ethylene oxide) copolymers with different diisocyanates. Hexamethylene diisocyanate (1,6-diisocyanatohexane) and isophorone diisocyanate (5-isocyanate1-isocyanatomethyl-1,3,3-trimetylcyclohexane) were used as functionalizing agents. This article reports on the effects that the various central elastomeric PAC blocks (type, content, and molecular weight) had on the polymerization kinetics and on the structure and molecular weights of the multiblock copolymers obtained. The copolymers were characterized spectroscopically.

Synthesis and characterization of poly(ε‐caprolactones) and poly(δ‐valerolactone): Macroactivators for obtaining poly(esteramides)

“…7 Preferentially, the bifunctional telechelic oligomers are used as a precursor for MAs. 8 They promoted the propagation of the polyamide chains in two directions. Therefore, block copolymers with central blocks (B) and terminal polyamide blocks (A) can be obtained, theoretically.…”

Preparation of PS‐g‐PA6 copolymers by anionic polymerization of ε‐caprolactam using PS precursors with N‐carbamated caprolactam pendants as macroactivators

“…During the anionic polymerization, an activator is usually added to speed up the polymerization (activated anionic polymerization) in the presence of a catalyst such as sodium caprolactamate (NaCL), and therefore functionalized PA6 can be prepared by using preformed polymers as macroactivators. [13][14][15] Instead of reacting the terminal functional groups of linear PA6 (amine and/or carboxylic acid groups) with their polymer component partners, the CL monomers are grafted onto macroactivator backbones. This grafting polymerization route is expected to generate graft copolymers with very high purity.…”

Structure, mechanical, and thermal behavior of nylon 6‐polyisoprene block copolymers obtained via anionic polymerization

“…The synthesis of PEO-PI-PEO telechelic oligomers and the corresponding block copolymers are reported in our previous work. 7 By varying the concentration of the MA from 2 to 10 wt % and its molecular weight (M n ϭ 2500; 3500; 11,000), a variety of block copolymers with a wide range of chemical and physical structure, morphologies, and mechanical properties can be obtained.…”