| Semiaromatic nylon has been widly used in thermoduric parts and thin-wall products due to its excellent rigidity, thermostability and dimensional stability. The utilization of semiaromatic nylon on automobile industry and surface mount technology is still a hotspot. Up to now, only the PA6T, PA9T and their copolymers were commercially applied. In all these semiaromatic nylons, the PA9T has good integrating properties. The PA12T ( poly(dodecamethyleneterephthalamide)) were synthesized using terephthalic acid and dodecamethylene diamine in Zhengzhou University, but its molecular weight is very low and these is no any application. The objective of our research is to gain the high molecular weight of semiaromatic nylon and excellent process ability. In this paper, two new semiaromatic nylons with high molecular weight, good properties, excellent process ability were synthesized using terephthalic acid and dodecamethylene diamine, tridecamethylene diamine (PA13T ) respectively firstly in the world. The effects of polymerization conditions on reaction were investigated. Meanwhile, the physical, mechanical properties and the dynamic mechanical properties of PA12T and PA13T were characterized. In the meantime, the non-isothermal melt crystallization kinetics, the thermal degradation process and mechanism were also studied. There are many advantages in PA12T and PA13T compared to PA9T, for example, convenient raw materials, advanced synthetic technology, low cost and better process ability, etc. Therefore PA12T and PA13T will be potentially applied in wide fields. The main results of our work are summarized as following:1. The PA12T and PA13T with high molecular weight were synthesized using terephthalic acid with dodecamethylene diamine and tridecamethylene diamine, which could be directly used in melt processing without being modified by...
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