Alkalische Polymerisation des 6-Caprolactams XVII. Aktivatoren der alkalischen Caprolactam-Polymerisation

Polymerization of lactams, 94. Formation of cyclic oligomers in anionic polymerization of 6-hexanelactam

“…The ampoules were charged in a filling vessel, heated to 100 8 C and connected to a mixing vessel, from which the melt of the polymerization mixture was transferred under argon atmosphere. The vessels and ampoules were evacuated and the mixture was forced into ampoules with dry argon 15) . Polymerizations were carried out in a salt bath at 190…”

Polymerization of lactams, 95 Preparation of polyesteramides by the anionic polymerization of ε-caprolactam in the presence of poly(ε-caprolactone)

“…In addition to the reaction of the lactam anion with CLO, also the reaction of this anion with the ester group of the polyester chain gives rise to the propagation centers-which is an analogy with the activation of the anionic polymerization by low-molar-mass esters [6]; Eq. (4).…”

“…Thus, by analogy, CLO could be considered to act as a classical activator of the anionic polymerization of CLA, such as g-butyrolactone [6]; Eqs. However, as was already suggested by Goodman and Vachon [3] and confirmed by us [5], CLO, due to its enormous polymerizing activity, is converted into the polyester as soon as it is dissolved in CLA (at 90 8C) during the preparation of the polymerization feed; Eq.…”

Disubstituierte carbamoyllactame und lactam‐N‐carbonsäureester als aktivatoren für die anionische lactampolymerisation

“…TZ =para N-Methyl-N-Cp-rnethoxyphenyl-)-carbamoylcaprolactam + M-Effekt der Methoxygruppe (4) Letztere bewirken durch induktiven Effekt, daB das Kohlenstoffatom der Carbonylgruppe im Lactamring weniger stark positiviert ist und die nach der Spaltung der Amidbindung des Lactams sich bildende negative Ladung starker am Stickstoff lokalisiert bleibt ; die Aktivatorwirkung der Substanzen wird auf diese Weise also vermindert. I n der Reihe der N-Methyl-N-phenylcarbamoyllactame laBt sich der EinfluB der Substituenten in p-Stellung des Phenylrestes besonders gut demonstrieren : Die Methoxygruppe hat durch die Beteiligung ihrer freien Elektronenpaare an der die Topfzeiten immer kurzer werden, d. h., die aktivierende Wirkung der Verbindungen wird gesteigert.…”