Polymerization of lactams XII. Branching of ε‐caprolactam with bislactams

Abstract

Copolymers of E-caprolactam with bislactams were prepared and the crosslinking ability of individual bislactams was estimated on the basis of the copolymer solubility in m-cresol. The branching ability established on the bask of the ratio of intrinsic viscosities of the branched and linear polymer with the same M, depends on the chemical structure of bislactams and serves simultaneously as a measure of their copolymerization ability. Further, a branched sample of poly-E-caprolactam was fractionated and a dependence of the intrinsic viscosity on M, was obtained. This dependence, showing a deviation from the dependence for the linear poly-s-caprolactam, indicates that the degree of branching increases with the molecular weight of the fractions. ZUSAMMENFASSUNG :Es wurden Copolymerisate von c-Caprolactam mit Bislactamen hergestellt und die Vernetzungswirksamkeit der einzelnen Bislactame auf Grund der Loslichkeit der Copolymerisate in m-Kresol beurteilt. Auf die Verzweigungswirksamkeit wurde aus dem Verhaltnis der Viskositatszahlen des verzweigten und linearen Polymerisates mit gleichem M, geschlossen. Es wurde festgestellt, daI3 die Verzweigungswirksamkeit von der chemischen Struktur der Bislactame abhangt und daD sie gleichzeitig als Ma13 fur die Copolymerisierbarkeit der Bislactame dienen kann. Ferner wurde eine verzweigte Probe des Poly-c-caprolactams fraktioniert und die Abhangigkeit der Viskositatszahlen von M, festgestellt. Diese Abhangigkeit, die eine Abweichung von der Abhangigkeit fur das lineare Poly-c-caprolactam aufweist, zeigt, daI3 der Verzweigungsgrad mit dem Molekulargewicht der Fraktionen wachst.

Nylon 6/SiO2Nanocomposites Synthesized by in situAnionic Polymerization

“…It is known from the literature data related to the thermal degradation of the polyamides, that chain scission takes place at the -NH-CO-bonds in the neighborhood of the carbonyl group [28,51,52]. All the nanocomposites showed no weight loss until around 320 1 C (onset decomposition) and retained 90% of their weight at about 390 1 C, in air.…”

Simulation of hydrolytic polymerization of .epsilon.-caprolactam in various reactors. A review on recent advances in reaction engineering of polymerization

“…Kralicek et al (55) reported that the influence of the impurities on the degree of polymerization and the rate of the polymerization are negligibly small when the impurities are less than 1 mol/1000 mol of CL. Kondelikova et al (53) reported a method of testing polymerization to assess the purity of CL.…”

Synthesis and properties of monomer casting polyamide 6/poly(methyl methacrylate) blends

“…The TGA 10, 30, and 50 wt % loss temperatures ( T 10 wt % , T 30 wt % , and T 50 wt % , respectively), maximum decomposition temperature ( T max ), and char yield are summarized in Table III. It is known from literature data related to the thermal degradation of the polyamides that chain scission takes place at the NHCO bonds in the neighborhood of the carbonyl group 22–24. T 10 wt % , T 30 wt % , T 50 wt % , and T max of the MCPA6/PMMA particles were reduced in comparison with those of the neat MCPA6.…”