Poly(ϵ‐caprolactam)–poly(butadiene‐ co ‐acrylonitrile) block copolymers. I. Synthesis, characterization, mechanical properties, and morphology
1994; Wiley; Volume: 53; Issue: 2 Linguagem: Inglês
10.1002/app.1994.070530210
ISSN1097-4628
Autores Tópico(s)Polymer Nanocomposites and Properties
ResumoAbstract 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.
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