Segmented block copolymers based on polyamide-4,6 and poly(propylene oxide)

Abstract

Segmented copolymers were obtained through copolymerization of polyamide-4,6 and poly(propylene oxide) (PPOx). An amine-terminated PPOx ('soft') segment of molar mass 430 was reacted with nylon-4,6 salt in an autoclave (30min, 210°C, 7 bar). In this reaction a prepolymer was prepared, which was postcondensed afterwards. In ethanol, a considerable amount of material could be extracted from the solid copolymers of low polyamide content. Extractability was found to be strongly reduced with increasing polyamide content, i.e. increasing length of the polyamide ('hard', crystallizable) segments. Torsional tests showed an extended rubber plateau of fairly constant modulus. Whereas PPOx has a T~ of-60°C, the T~ values of the copolymers were higher as a result of (i) the restricted length of the PPOx segments and (ii) dissolution of uncrystallized polyamide segments in the PPOx phase. The high melting point of polyamide-4,6 was approached by the copolymer of high polyamide content, but the softer copolymers had lower melting points because of insufficient length of the polyamide segments.

Facile Synthesis of Thermoplastic Polyamide Elastomers Based on Amorphous Polyetheramine with Damping Performance

“…For PPG-based TPAEs, monomer casting PA6 modified with maximum 6 wt % of this polyetheramine shows an obvious decrease in crystallization ability and an elastic deformation behavior [30]. Grymans et al selected PA46 salt and PPG diamine to prepare PA46-PPG segmented copolymers via condensation followed by solid-phase polycondensation [31]. However, severe macro-phase separation occurs despite adding m-cresol as solvent.…”

Highly Solvent‐Resistant Polystyrene Based on Uniform Tetraamide Units

“…) . The T6T6T segments have been incorporated into hydrophobic polyether‐based copolymers such as polytetramethyleneoxide (PTMO), polyethyleneoxide block copolymers, poly(2,6 dimethylphenylene ether), and polysufhone . After incorporation of tetraamide units into the amorphous polymers, the polymer becomes semicrystalline materials having high crystallinity with high crystallization rates.…”

Thermoplastic Polyamide Elastomers: Synthesis, Structures/Properties, and Applications

“…Additionally, since the chain‐length distribution of commercially available poly(propylene oxide) (PPO) oligomers is much narrower than that of PTMG oligomers, Hutten et al. [ 32 ] fabricated TPAEs via employing PPO in place of PTMG as the soft segment. It is demonstrated that the lower limit of the rubber region for this TPAE decreases with the increase of PPO content.…”