Synthesis and characterization of grafted copolymers of aromatic polyimides and ε‐caprolactam

Abstract

Anionic polymerization of e-caprolactam was performed in the presence of only 5 wt % of aromatic polyimides having five-and six-membered imide cycles and bearing hexafluoroisopropylidene, ether, fluorene, siloxane, phthalide, or SO 3 HA groups, both in the polymer backbone and as side moieties. The synthesized new copolymers were fully characterized by IR spectroscopy, thermomechanical analysis, dilatometry, and X-ray diffraction. Tough and frictional properties of the obtained copolymers were estimated as well. It was found that on the selection of polyimide activator it is possible to gain the desirable control over the polymer properties, namely the gel-fraction content, phase composition, compression modulus, notched Izod impact strength, temperature of frictional contact, friction coefficient, etc. These investigations will facilitate the choice of the optimum macromolecular activator for the modification of both the synthetic method and the properties of the commercial polycaproamide.

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

“…The growing chain ends are always corresponding to N-acyllactam and the number of the polymer chains should be equal to that of the N-acyllactam if there are no side reactions. Thus, non-linear PA6 could be theoretically fabricated by adding multifunctional N-acyllactam type activators [17,18]. Ashida et al explored a tertiary amine centered trifunctional activator from Desmodur L-2291A and CL [6].…”

Polycaproamide Modified by Single‐Walled Carbon Nanotubes as Protective Coating for Optical Fiber

“…On the contrary, polymer synthesized in the presence of PI only swells in cited solvents. Such behavior can be explained by the three‐dimensional structure formation that is typical for PCA obtained in the presence of polyfunctional activator as PI . It was found copolymers based on PCA and PI become soluble in formic acid after one month ageing in HCOOH at room temperature (η inh = 4.4 dL g −1 ).…”

Effect of single-walled carbon nanotubes with imide cycles on the synthesis and properties of polycaproamide

“…The fact that the use of polyfunctional activators, in our case, PI macromolecules, grafted onto the surfaces of single-walled CNTs in the anionic activated polymerization of CL facilitates the formation of branched copolymers with a partially crosslinked structure [33][34][35] served as a premise for investigations of the solubility of the composites. Samples obtained with single-walled CNTs or single-walled CNTs with grafted acyllactam groups are well soluble in m-cresol and formic acid, like linear PCA.…”

“…As was shown in [33][34][35], aromatic polyimides soluble in a CL melt participate in anionic activated polymerization. Effects of the nature and concentration of the filler on the formation and properties of PCA were studied.…”