Abstract
A series of processable semi-aromatic polyamides containing thioether units have been developed. They were synthesized through the reaction of 4,4’-bis(4-chloroformylphenylthio)benzene (BPB-DC) and aliphatic diamine by the method of interfacial polycondensation. These polyamides had excellent thermal properties with glass transition temperatures (Tg) of 124–137.9°C, melting temperatures (Tm) of 306.4–324.1°C and initial degradation temperatures (Td) of 409.5–437°C. They had wider processing windows than traditional semi-aromatic polyamides and can be processed by the melting method. They had better tensile strengths of 61.2–73.7 MPa, low-temperature mechanical properties, low water absorption of 0.17%–0.23%, low dielectric constants of 3.47–3.66 at 100 kHz and better melt flowability properties of 37.3 to 164.4 Pa. s, 48.2 to 281.7 Pa. s and 58.3 to 486.7 Pa. s at different shear rates, respectively. Additionally, these polyamides showed good corrosion resistance, they did not dissolve in solvents such as NMP, DMSO, hydrochloric acid (6 mol/L), H3PO4 and solution of NaOH (1 mol/L) etc.
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