Synthesis and Properties of Polyesteramides Having Short Nylon-610 Segments in the Main Chains through Polycondensation and Chain Extension

Abstract

One kind of nylon-610 oligomer (PrePA) was prepared from the reaction of nylon-610 salt with sebacic acid. Polyesteramide prepolymers (PrePEAs) having amide content from 10 to 60 mol % were synthesized through melt polycondensation from adipic acid, 1,4-butanediol, and the PrePA with the catalysis of stannous chloride. Chain extension of the PrePEAs was carried out at 210 °C using 2,2′-(1,4-phenylene)-bis(2-oxazoline) and adipoyl biscaprolactamate as combined chain extenders. The chain extended polyesteramides (ExtPEAs) with intrinsic viscosity up to 0.70 dL/g were synthesized. The ExtPEAs were characterized by FTIR and 1H NMR spectrum, differential scanning calorimetry, wide-angle X-ray scattering, thermogravimetric analysis, tensile test, and enzymatic degradation. The results showed that the ExtPEAs were biodegradable and had T m from 95.20 to 155.67 °C, initial decomposition temperature over 325.3 °C, and tensile strength up to 33.1 MPa.

A new class of poly(ether‐block‐amide)s based on semi‐aromatic polyamide: synthesis, characterization and structure–property relations

“…6, the initial decomposition temperature ( T d,5% ) of all samples is very close in the temperature range between 370 and 378 °C. It is much higher than those of PA6‐PEG (320 °C), 18 PA6‐ b ‐PDMS (339 °C) 25 and PA610‐ester (344 °C) 45 . The mass loss of TPAE is less than 2 wt% when the temperature is below 350 °C.…”

Synthesis, Characterization and Non-Isothermal Crystallization Kinetics of a New Family of Poly (Ether-Block-Amide)s Based on Nylon 10T/10I

“…Compared to the DTG curve of PA10T/10I, the variation of TPAEs curves near 450-480 • C. The main reflect factor is the hard segment PA10T/10I decomposition. Although the initial decomposition temperature of TPAEs is lower than that of PA10T/10I, the thermostability of PA10T/10I-PEG is better than most thermoplastic polyamide elastomer, such as PA6-PEG (320 [10] and PA610-ester (344 • C) [39].…”

“…The main reflect factor is the hard segment PA10T/10I decomposition. Although the initial decomposition temperature of TPAEs is lower than that of PA10T/10I, the thermostability of PA10T/10I-PEG is better than most thermoplastic polyamide elastomer, such as PA6-PEG (320 °C) [5], PA6-PTMG (364 °C) [37], PA6-b-PDMS (339 °C) [10] and PA610-ester (344 °C) [39]. A TGA instrument was used to assess the thermal stability.…”

High‐Performance Flame‐Retarded Polyamide‐6 Composite Fabricated by Chain Extension

“…It is noteworthy that the reinforced composite possesses even higher flexural and impact strengths than those of neat PA6. The improvement of mechanical strength behaves as an indicative evidence for chain extension reaction between the epoxide rings of DEP and the amino or carboxyl end groups of PA6, in which the molecular weight is raised during the processing …”

“…The improvement of mechanical strength behaves as an indicative evidence for chain extension reaction between the epoxide rings of DEP and the amino or carboxyl end groups of PA6, in which the molecular weight is raised during the processing. [ 36,37 ] On the other side, the increment of molecular weight also affects the friction of chain segmental motion, [ 22,38 ] which causes signifi cant drop of the melt fl ow rate (MFR) of the polymer, as shown in Table 4 . This result gives a benefi t to the extrusion process as the extruded melt becomes more viscous, thus improving the stability of processing.…”