Alternating block copolymers based on polyamide‐12 and polycaprolactone

Abstract

A series of alternating polyester/polyamide block copolymers were prepared by sequential conversion of hydroxy-terminated polycaprolactone and amino-terminated polyamide-12 with a selectively reacting coupling agent. The thermal properties of the block copolymers were investigated using differential scanning calorimetry and dynamic mechanical analysis. Mechanical properties were determined using tensile and impact tests. All polymers were phase-separated, where the polyamide phase was semicrystalline in all compositions. Distinct crystallization of the polycaprolactone phase was observed only when the block length was greater than 2000 g mol −1 . Mechanical testing showed that the polymers behave in a manner similar to that of thermoplastic elastomers. In particular, samples with a high content of polycaprolactone showed high strain and good impact behaviour.

Synthesis and Structural NMR Characterization of Novel PPG/PCL Conetworks Based upon Heterocomplementary Coupling Reactions

“…By this way, defined block and graft copolymers based on polyamides, polyesters and polyethers were synthesized in the melt. [11][12][13] The potential application of heterocomplementary terminal group reactions is particularly relevant for the synthesis of conetworks in which the arms of different star-shaped prepolymers are linked to each other. [14,15] Here, different methods of click-chemistry such as azide-alkyne cycloaddition [16,17] and thiol-ene coupling [18][19][20] as well as Diels-Alder reactions [21] have been utilized, among others.…”

“…To overcome this problem, we utilized coupling agents with different highly selective reacting groups which enabled us to perform heterocomplementary carboxy/amino and hydroxy/amino group coupling. By this way, defined block and graft copolymers based on polyamides, polyesters and polyethers were synthesized in the melt …”

Polyetheramine‐Type Semi‐Biobased Long‐Chain Polyamide 1210 Elastomer: Synthesis, Structure, and Unique Thermal Behavior

“…Thermoplastic polyamide elastomers (TPAEs) are a novel class of thermoplastic elastomers synthesized through alternating copolymerization processes involving polyamide and polyether/polyester segments. [1][2][3][4][5] Polyamide serves as the hard segment, giving TPAEs with remarkable dimensional stability, chemical resistance, abrasion resistance, and thermal stability. [6][7][8][9] Conversely, polyether/polyester soft segment DOI: 10.1002/mame.202300426 contributes to substantial elongation at break, impressive impact resistance, and exceptional low-temperature flexibility.…”

Semicrystalline-Glassy Multiblock Copolymers via Mechanochemical Synthesis toward Tough Poly(lactide)

“…The semicrystalline and aliphatic PA derivatives have been incorporated into the following multiblock thermoplastic elastomers (TPEs). For the polyamide-based TPEs (TPAEs) with (AB) n type of multiblocks composed of the crystalline PA derivatives as a hard block (A) and a rubbery phase (B, T g = −124 to –44 °C) of poly­(tetramethylene glycol), poly­(trimethylene glycol), poly­(isobutylene), poly­(dimethylsiloxane), , poly­(ε-caprolactone), , and poly­(butylene terephthalate), showing superior elastomeric performance (σ yield = 10–55 MPa and ε b = 15–1050%) with a PA derivative weight fraction ( w PA derivatives ) of 0.17–0.94 and even strain-hardening. − To completely develop a glassy-semicrystalline multiblock structure with improved toughening in brittle plastics, such as PLA, PA11 can be introduced as a semicrystalline segment, covalently linked with glassy amorphous PLA in the multiblocks. However, there is serious impediment to preparing PA11 block copolymers because hydrogen bonding between amide groups can cause low solubility to multiple organic solvents and a high melting temperature (>180 °C) …”