Copolyesteramides—II. Anionic copolymers of ε-caprolactam with ε-caprolactone. Preparation and general properties

Microwave syntheses of poly(?-caprolactam-co-?-caprolactone)

“…ratio. The molecular weight was slightly lowed at higher catalyst content, as might be expected, suggesting that the -caprolactone reactivity is greater than the -caprolactam reactivity, in agreement with thermal studies of Goodman et al 10 The microstructure of the microwave synthesized PAE copolymer appears to be random, based on the fact that a single glass transition temperature T g is observed for each copolymer, as depicted in Figure 7. This random chain structure was also confirmed by comparing the T g determined by the DMTA to the T g evaluated from the Fox eq.…”

“…This implies that, under these conditions, -caprolactone is the more rapidly reacting monomer that polymerizes selectively at the 0.5% sodium caprolactam catalyst level. Goodman et al 10 further reported that higher temperatures, higher catalyst concentrations, and longer reaction times cause a more equal incorporation of the two monomers, giving products with molecular weights in the order of 10 4 , and with the lactam and lactone unit contents approximating the reactant feeds.…”

Continuous polymerization of lactam–lactone block copolymers in a twin‐screw extruder

“…They reported that sodiocaprolactam (Na-CA) was employed as the source of catalytic lactamate anions and CL served as both coinitiator and comonomer. 28 They also argued that a random structure was attributed to the occurrence of base-catalyzed amideester interchange reactions. They did not use a particular coinitiator like N-acetyl CA because the comonomer of CL also served as coinitiator.…”

Concept and Synthesis of Poly(ester amide)s with One Isolated, Two or Three Consecutive Amide Bonds Randomly Distributed Along the Polyester Backbone

“…Such PEAs can be prepared by condensing either (i) lactones with lactams or (ii) lactones and lactams with diamines, diols and diacid derivatives [1][2][3][4][5][6][7][8][9][10][11]. BAK ® 1095, a commercial product from Bayer is a random semi-crystalline PEA based on ε-caprolactam, 1,4-butanediol and adipic acid [1,2].…”

“…Ringopening co-polymerization of lactones and lactams affords random co-polymers [1,2,[4][5][6][7][8][9][10][11][104][105][106][107]. Aliphatic and/or aromatic dicarboxylic acids and diols with varying number of methylene groups give rise to various microstructures and architectures.…”