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

Abstract

Novel thermoplastic polyamide elastomers (TPAEs) consisting of long-chain semicrystalline polyamide 1212 (PA1212) and amorphous polyetheramine were synthesized via one-pot melt polycondensation. The method provides accessible routes to prepare TPAEs with a high tolerance of compatibility between polyamide and polyether oligomers compared with the traditional two-step method. These TPAEs with 10 wt % to 76 wt % of soft content were obtained by reaction of dodecanedioic acid, 1,12-dodecanediamine, and poly(propylene glycol) (PPG) diamine. The structure–property relationships of TPAEs were systematically studied. The chemical structure and the morphologic analyses have revealed that microphase separation occurs in the amorphous region. The TPAEs that have long-chain PPG segments consist of a crystalline polyamide domain, amorphous polyamide-rich domain, and amorphous polyetheramine-rich domain, while the ones containing short-chain PPG segments comprise of a crystalline polyamide domain and miscible amorphous polyamide phase and amorphous polyetheramine phase due to the compatibility between short-chain polyetheramine and amorphous polyamide. These novel TPAEs show good damping performance at low temperature, especially the TPAEs that incorporated 76 wt % and 62 wt % of PPG diamine. The TPAEs exhibit high elastic properties and low residual strain at room temperature. They are lightweight with density between 1.01 and 1.03 g/cm3. The long-chain TPAEs have well-balanced properties of low density, high elastic return, and high shock-absorbing ability. This work provides a route to expand TPAEs to damping materials with special application for sports equipment used in extremely cold conditions such as ski boots.

Structure-Property Relationship on the Example of Gas Separation Characteristics of Poly(Arylene Ether Ketone)s and Poly(Diphenylene Phtalide)

“…This behavior seems to be associated not only with an increased free volume in polymers, but also with the presence of specific interactions of the CO 2 molecule with oxygen-containing phthalide and ketone groups. A similar phenomenon is often recorded when studying sorption and permeability in polymers containing ether groups (e.g., Pebax [69]).…”

Flexible preparation of PA6-based thermoplastic elastomer filaments with enhanced elasticity, melt spinnability and transparency enabled by high-molecular-weight soft segments

“…It was observed that the storage modulus E ′ of TPAE-0 was much larger than that of HS-TPAEs, indicating that the incorporation of PTMG segments softened PA6 segments. 32 As a result, an elastic plateau at around room temperature with a low E ′ and minimal temperature dependency was observed. Notably, HS-TPAE-55 exhibits a smaller E ′ value than HS-TPAE-60 and HS-TPAE-70, despite having lower contents of soft segments.…”

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

“…In addition, the peak at 𝛿 = 182.9 ppm (C k ) in the 13 C NMR spectrum suggests the presence of residual carboxyl groups in TPAE44. [29] This discrepancy arises from the co-evaporation of the PEA along with a large amount of water vapor during the prepolymerization. Therefore, it is necessary to maintain pressure to minimize PEA loss or consider increasing the ratio of PEA during feeding.…”

“…Thus, studies have been conducted to prepare polyamide elastomers using PA1212 and PEA as the reaction segment. [28][29][30] Furthermore, TPAE products such as VES-TAMID E by Evonik Germany and UBESAT XPA by UBE Japan, also use PEAs and long-chain PA12 as constituents. Some studies have been devoted to the development of biobased polyamide elastomers.…”