Synthesis and characterization of a high performance polyamide‐6 elastomer based on poly(ether‐block‐amide) multiblock copolymer by reactive processing in torque rheometer

Abstract

The polyamide-6 based poly(ether-block-amide) (PEBA) multiblock copolymers were reactively prepared in typical processing equipment, torque rheometer. The reactive processing conditions of PEBA were discussed in details on the base of the tensile strength as the main quantization parameter and the torque rheological curves.The optimized reaction temperature, reaction time, and rotational speed were 150°C, 10 min, and 40 rpm respectively. The chemical structure, tensile properties, thermal transition, thermal stability, water absorption, and solubility in organic solvents of PEBA prepared in optimized reaction conditions were characterized by Fourier transform infrared spectroscopy, tensile testing, differential scanning calorimetry, thermogravimetric analysis, and soaking testing in water and organic solvents. The tensile strength and elongation at break of PEBA are 35.9 MPa and 580% respectively. The glass transition temperature and melting temperature of soft segment of PEBA are −50 and 15°C, respectively; the glass transition temperature and melting temperature of hard segment of PEBA are 50 and 140°C respectively. Meanwhile, the PEBA has low water absorption, robust organic solvent resistance, and good thermal stability. The optimization process of PEBA will give the deep understanding of reactive processing of polymer materials. K E Y W O R D Scondition optimization, environmentally friendness, multiblock copolymer, reactive preparation, torque rheometer

Multiple/Two‐Way Shape Memory Poly(urethane‐urea‐amide) Elastomers

“…As shown in Figure S1b (Supporting Information), the increase of torque indicated that the polymerization reaction occurred between OPA and OPU, and the decrease of torque was related to the decrease of viscosity caused by rotor shear heat generation. [ 51 ] Finally, the equilibrium of torque demonstrated that the reaction was complete. PUUA elastomer has the inherent advantages of adjustable mechanical properties and crystallization/melting temperature, which is attributed to variable ration of PTMEG and OPA existing in the network of the block copolymer.…”

“…[37] However, many crosslinked semi-crystalline SMPs don't possess 2W-SME at the same time [38] and the switching temperature is generally low, [6,39,40] which may be difficult to meet the applications of complex shape transformation such as aerospace. In our previous works, a new kind of thermoplastic elastomer, poly(urethane-urea-amide) (PUUA), was synthesized [36,41] and it is a novel shape memory polymer material with wide temperature memory range, excellent wear resistance, good fatigue resistance [42][43][44] compared with polyurethane, [45] polyethylene. [46] Besides, PUUA possesses several transition temperatures including a high transition temperature, which has the potential to realize multiple and two-way shape memory effects.…”

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

“…[ 38 ] and Lei et al. [ 39 ] chose reactive processing instead of solvent polycondensation to carry out the third step reaction in fabricating I‐M TPAEs during a very short time (i.e., 10 min) by exploiting HAAKE double‐screw extruder and torque rheometer. This preparation strategy avoids the drawback of solvent‐consuming post‐treatment and achieves environmentally friendly processing meanwhile; it also is more suitable and convenient for large‐scale industrial production, because the two typical thermoplastic processing apparatuses (HAAKE double‐screw extruder and torque rheometer) are widely used in industries.…”

Role of graphene nanoplatelets and carbon fiber on mechanical properties of PA66/thermoplastic copolyester elastomer composites

“…Alongside, all these preliminary investigations, a few kinds of literature were found on examining the degradation and effect of moisture on PA66 [8][9][10]. Recent progress in the polymer sector is to blend two or more polymer of similar chains to attain the benefits of both the polymers [11][12][13][14]. Kelnar et al modified the PA6 with ethane-propene elastomer and reinforced with graphene oxide (GO) and revealed that the material system demonstrated increased strength, stiffness and toughness [15].…”