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Poly(ϵ‐caprolactam)–poly(butadiene‐ co ‐acrylonitrile) block copolymers. I. Synthesis, characterization, mechanical properties, and morphology
Author(s) -
Yn MengSong,
Ma ChenChi M.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070530210
Subject(s) - copolymer , materials science , acrylonitrile , caprolactam , polymer chemistry , izod impact strength test , morphology (biology) , composite material , chemical engineering , polymer , ultimate tensile strength , genetics , biology , engineering
Poly(ϵ‐caprolactam)–poly(butadiene‐co‐acrylonitrile) block copolymers have been synthesized that were suitable for the pultrusion process. The effects of amine‐terminated butadiene acrylonitrile copolymer (ATBN) content on copolymerization rate, conversion, crystallization behaviors, and mechanical properteis and morphology of NY 6–ATBN copolymers were investigated. The conversion was over 90% and the copolymerization was completed within 3 min (up to 20 wt % ATBN) at 145–165°C. The higher the [MgBr—CPL] (ϵ‐caprolactam magnesium bromide) initiator concentration, the lower the molecular weight [or intrinsic viscosity (IV)] of the copolymers and the less the copolymerization time. Relationships among mechanical properties, morphology, and structure of copolymers have been studied. The notched Izod impact strength of the NY 6–ATBN copolymers (< 10.5 wt % ATBN) increased more than 10‐fold, while the flexural modulus only reduced 10%. Transmission electron micrographs showed that ATBN rubber particle size changed slightly with ATBN content, but interparticle distance ( T ) decreased with increasing ATBN content. As T decreased, the ductility of the copolymers increased. When ATBN content reached 10.5–13 wt % ( T = 0.32–0.45 μm), the copolymers showed a very high ductile behavior. © 1994 John Wiley & Sons, Inc.