Abstract
Poly (decamethylene terephthalamide) (PA10T) is a kind of engineering plastics with high strength and high modulus, but one of its disadvantages is its low elongation at break. In order to improve the flexibility of PA10T, one aliphatic comonomer with a long alkyl chain is introduced to the molecular chain of PA10T. Then long chain semiaromatic copolyamides 10T/1014 were synthesized with different contents of 1014 units by polycondensation reaction of 1,10-diaminodecane, terephthalic acid and 1,12-dodecanedicarboxylic acid in deionized water. The intrinsic viscosities of the resultant polyamides ranged from 0.90 to 1.03 dL/g were obtained. The chemical and crystal structures of the copolymers were characterized by FTIR, 1H-NMR and WAXD. These copolyamides exhibited outstanding thermal properties with melting points range of 306–295 °C and degradation temperatures range of 479–472 °C at maximum degradation rate, and also have a wider processing window than PA10T. The tensile strength of PA10T/1014 copolymers decreased gradually from 80.02 to 72.95 MPa as the content of 1014 units increasing from 5 to 20 mol %, while the elongation at break increased significantly from 57 to 150%. The moisture content of 10T/1014 copolyamides decreased with increasing the 1014 unit contents. It suggests that 10T/1014 copolyamides could be a kind of promising heat-resistant engineering thermoplastic in the future applications.
Highlights
Aliphatic polyamides, such as nylon 6 and nylon 6,6, play an important role in automotive industry and electronic areas due to their excellent processability and toughness, but the lack of high thermal and dimensional stabilities limits their further application [1,2,3,4,5,6]
As a kind of semiaromatic polyamide, poly (PA10T) synthesized by polycondensation of 1,10-diaminodecane and terephthalic acid in organic solvent or deionized water has the properties of excellent heat resistance, good processability, outstanding dimensional stability, low water absorption and so on [20]
With the appearance and wide application of surface-mount technology (SMT) that requires the melting point of polymers to be above 215 °C, PA10T has a high melting temperature and good heat-resistant properties, which can meet the requirement of SMT, and has a wide application in electronic, as well as automotive and aeronautic areas
Summary
Aliphatic polyamides, such as nylon 6 and nylon 6,6, play an important role in automotive industry and electronic areas due to their excellent processability and toughness, but the lack of high thermal and dimensional stabilities limits their further application [1,2,3,4,5,6]. As a kind of semiaromatic polyamide, poly (decamethylene terephthalamide) (PA10T) synthesized by polycondensation of 1,10-diaminodecane and terephthalic acid in organic solvent or deionized water has the properties of excellent heat resistance, good processability, outstanding dimensional stability, low water absorption and so on [20]. With the appearance and wide application of surface-mount technology (SMT) that requires the melting point of polymers to be above 215 °C, PA10T has a high melting temperature (about 316 °C) and good heat-resistant properties, which can meet the requirement of SMT, and has a wide application in electronic, as well as automotive and aeronautic areas. By introducing aminoundecanoic acid as the comonomer, the melting point of PA10T/11 effectively decreased on the premise of ensuring the high heat resistant property [27]. The research on the chemical modification of PA10T will be helpful for developing heat-resistant polyamides with expected performances from bio-based raw materials
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