Preparation and properties of poly(hexamethylene oxamide) copolymers containing ether moiety

Abstract

To modify the properties of poly(hexamethylene oxamide) (PA62), amine-terminated polyoxypropylene glycols (PGs) were introduced into the polyoxamide main chain as soft segments. A series of PA62/PG2 copolymers were synthesized successfully by a two-step method. Fourier transform infrared spectroscopy, solution proton nuclear magnetic resonance spectroscopy ( 1 H-NMR), differential scanning calorimetry, thermogravimetric analysis, and wide-angle X-ray diffraction were used to analyze the structures and to investigate the properties of these copolymers. The saturated water absorption was also evaluated by gravimetric analysis for PA62/PG2 copolymers. The results revealed the incorporation of PG2 effectively modified the properties of PA62 and the copolymers with PG2 content of 10-20 mol% possessed high melting point (2938C-3148C), good thermal stability and low saturated water absorption. POLYM. ENG. SCI., 00:000-000, 2017.T 5 : the decomposition temperature corresponding to 5% mass loss. b T 50 : the decomposition temperature corresponding to 50% mass loss. c T max : the decomposition temperature corresponding to the maximum mass loss rate.

Synthesis and characterization of poly (1,6‐hexamethylene oxamide‐co‐m‐xylene oxamide) copolymers

“…This low saturated water absorption should be mainly attributed to the unique adjacent double hydrogen bonds in POA and high crystallinity of PA62, which gave it a better dimensional stability compared with PA6. Similar behaviors have been also reported in others copolymer of PA62 …”

“…However, 1,5‐pentamethylene diamine is expensive and unstable in supply in present, limiting its large‐scale application. Preliminary study confirmed that the properties of poly (hexamethylene oxamide) (PA62) copolymers are comparable with PA52, and it is far better than PA46 . The raw materials of PA62 are cheap and easy to obtain.…”

“…The raw materials of PA62 are cheap and easy to obtain. However, PA62 is not suitable for melting processing as its melting points are too high . Therefore, several approaches have been developed through synthetic modifications such as incorporating long‐chain diamines, naphthalene rings, benzylidene structure, cyclohexane and trifluoro groups, and bulky pendant groups into the polymer backbones .…”

Synthesis and characterization of poly(hexamethylene terephthalate/hexamethylene oxamide) alternating copolyamide (alt‐PA6T/62)

“…Recently, much research on polyoxamides has been reported by utilizing this two-step polymerization method, and high-performance polyoxamides have been successfully synthesized. [24][25][26][27][28][29] Comonomers are commonly utilized in polyamides to change the melt temperature and improve the processability. In this way, random copolyamides can be easily prepared.…”

Modificação das propriedades da poliamida 12 pela incorporação de carbonato de cálcio nanoparticulado

“…As poliamidas destacam-se entre os polímeros de engenharia por sua boa resistência química e à abrasão, boa resistência ao impacto e à flexão, alta resistência à fadiga e baixo coeficiente de atrito (DONG et al, 2017). Em contrapartida, as poliamidas são higroscópicas e sua estabilidade dimensional é inferior aos demais polímeros de engenharia, afetando as dimensões do produto final, uma vez que ocorre o inchamento do material após a absorção de água (PREDA et al, 2015).…”