The structure and properties of polycaproamide formed under the conditions of anionic polymerization of ϵ-caprolactam

Slonimskii, G.L.; Askadskii, А.A.; Бычко, К. А.; Korshak, V. V.; Frunze, T. M.; Фролов, Михаил Вадимович; Kurashev, V.V.; Zaĭtsev, V. I.

doi:10.1016/0032-3950(73)90231-1

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“…At reaction temperatures below 150°C, the nonactivated homopolymerization of ϵ‐caprolactam does not proceed because of the high activation energy of the initial slow step of the nucleophilic attack by the anion of the lactam on the carbonyl carbon atom of the monomer 1–5. Thus, there was no ϵ‐caprolactam homopolymer formed at 120°C.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and characterization of polyimide‐g‐nylon 6 copolymers from nonfunctionalized polyimides

Pae

2005

J of Applied Polymer Sci

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ABSTRACT:In this research, the anionic polymerization of -caprolactam was carried out in the presence of small amounts of several different polyimides to generate polyimide-g-nylon 6 copolymers. The polyimides, which were prepared from 2,2Ј-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and commercially available diamines with a one-step method, were first dissolved in molten -caprolactam. Phenylmagnesium bromide was then added at 120°C. Under these conditions, caprolactam anions were formed that attacked the five-membered imide rings to form N-acyllactam moieties, which activated the anionic polymerization of caprolactam. In essence, nylon 6 chains grew from the polyimide backbones. Probably because of a high activation energy, the process was relatively slow, requiring 1 h at 120°C. The introduction of 5 wt % polyimide into the graft copolymers produced significant increases in the tensile modulus and tensile strength in comparison with those of low-and high-molecular-weight nylon 6. The elongation to break, however, was reduced.

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Section: Resultsmentioning

confidence: 99%

“…An acyllactam or a reactive precursor to an acyllactam is required to carry out the anionic polymerization of lactams at a low temperature and high efficiency 1–5. In fact, numerous publications describing activating systems for the anionic polymerization of lactams have been published 6–11.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyimide‐g‐nylon 6 copolymers from nonfunctionalized polyimides

Pae

2005

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

The structure and properties of polycaproamide formed under the conditions of anionic polymerization of ϵ-caprolactam

Cited by 1 publication

References 2 publications

Preparation and characterization of polyimide‐g‐nylon 6 copolymers from nonfunctionalized polyimides

Preparation and characterization of polyimide‐g‐nylon 6 copolymers from nonfunctionalized polyimides

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