Copolymerization of caprolactam with polyoxybutylene diamine

Abstract

Nylon 6‐polyoxybutylene block copolymers were prepared by reacting polyoxybutylene diamine with caprolactam in the presence of phosphoric acid. The copolymerization was carried out in a Helicone‐type reactor and the effect of time, temperature, and caprolactam concentration on the properties of the products was recorded. Differential Scanning Calorimetry studies of the products suggest the presence of both the ABA and AB types of sequences, where A and B represent nylon 6 and polyether blocks, respectively. Dynamic mechanical measurements of typical copolymers revealed the presence of at least two different nylon moieties. The melt rheology data reflect a general increase in the pseudoplasticity of the copolymer with the increase of the polyether content. Increases of the polyether content in the copolymer result in an increased elongation and a decreased tensile strength and modulus.

In‐situ Synthesis and Characterization of Polyamide 6/POSS Nanocomposites

“…[1,2] Hence, many research works have been carried out on PA6 to further enhance its end-use properties by means of copolymerization with other co-monomers and the incorporation of inorganic reinforcing filler materials in various dimension ranges. [3][4][5][6] Among the fillers available, the use of polyhedral oligomeric silsesquioxane (POSS) has attracted special attention because of its nanoscaled organic-inorganic hybrid structure and the availability of various functionalities which can facilitate its even distribution into organic polymer matrixes. Generally, the POSS molecules were incorporated into the polymer matrix by the conventional processing techniques such as in-situ polymerization and meltcompounding.…”

Novel Polyesteramide‐Based Diblock Copolymers: Synthesis by Ring‐Opening Copolymerization and Characterization

“…As far as the polymerization of CLo is concerned, the amine function initiates the ROP of the lactone generating again an amide bond at one extremity of the growing polyester chain and an hydroxyl function at G. Deshayes et al the other one, which propagates the polymerization reaction (Scheme 1.2). [15] It is worth reminding that a hydroxyl function cannot initiate the ROP of CLa under most of the investigated polymerization conditions (see ref. [15] and papers cited herein).…”

“…[15] It is worth reminding that a hydroxyl function cannot initiate the ROP of CLa under most of the investigated polymerization conditions (see ref. [15] and papers cited herein).…”

“…Indeed, lactams are known to readily polymerize through an aminolytic mechanism when initiated by primary amine functions, yielding high molecular weight polyamides. [15] Actually, the amine function of the macroinitiator promotes the ringopening of the lactam by a nucleophilic attack onto the carbonyl carbon atom, followed by the amide cleavage and concomitant formation of an amide bond between the macroinitiator residue and the monomeric unit, and a new amine function capable to propagate the polymerization reaction (Scheme 1.1). As far as the polymerization of CLo is concerned, the amine function initiates the ROP of the lactone generating again an amide bond at one extremity of the growing polyester chain and an hydroxyl function at G. Deshayes et al the other one, which propagates the polymerization reaction (Scheme 1.2).…”

Morphological and thermal investigations of nylon‐6‐poly(sulfone ether)‐nylon‐6 triblock copolymers

“…Investigations [3] on the mechanism of the hydrolytic polymerization of c-caprolactam have shown that the lactam is mainly converted by a reversible addition reaction to amine endgroups. The rate of the addition reaction onto the amine endgroups was found [3] to be much higher than the rate of the hydrolysis reaction of the lactam. Therefore, the formation of the copolymer is favored over the formation of the nylon-6 homopolymer.…”