耐高温PA5T/55的制备及性能  

Preparation and performance of heat-resistant PA5T/55

作　　者：刘羽玲 贺爽爽 刘冰肖 李媛 崔林晖 谭善兴 刘显勇 王忠强 张慧斌 LIU Yuling;HE Shuangshuang;LIU Bingxiao;LI Yuan;CUI Linhui;TAN Shanxing;LIU Xianyong;WANG Zhongqiang;ZHANG Huibin(Guangdong Sinoplast Advanced Plastic Co.,Ltd.,Dongguan 523860,China;Taiyuan Institute of Technology,Taiyuan 030051,China)

机构地区：[1]广东中塑新材料股份有限公司,广东东莞523860 [2]太原工业学院,太原030051

出　　处：《工程塑料应用》2024年第4期55-60,共6页Engineering Plastics Application

基　　金：2023年中塑公司-太原工业学院产学研合作项目(820668)。

摘　　要：半芳香族聚对苯二甲酰戊二胺(PA5T)的熔融温度与分解温度接近,导致其加工时易分解。基于上述背景,将脂肪族聚戊二酰戊二胺(PA55)链段引入PA5T均聚物中以改善其加工性。以戊二酸、对苯二甲酸和戊二胺为原料,通过成盐、预聚和固相缩聚法制备了不同PA55链段含量的聚对苯二甲酰/戊二酰戊二胺共聚物(PA5T/55)。采用傅里叶变换红外光谱仪和核磁共振氢谱对共聚物的结构进行了确认,在此基础上,利用差示扫描量热仪、热重分析仪、X射线衍射仪以及万能试样机分别对其熔融温度、热分解温度、结晶性能以及物理力学性能进行了测试表征。研究结果显示,随着PA55链段含量的增加,PA5T/55的结晶度和熔融温度均呈现下降趋势;当共聚物二元酸中PA55链段物质的量为50%时,其熔融温度为311.4℃,质量损失5%时的温度为426.15℃,最大热降解速率温度为474.80℃,质量损失95%时的温度为498.49℃,拉伸强度为67.9 MPa,综合性能优异。PA5T/55共聚物具有良好的耐热性和比较宽的加工窗口,在电子电器、LED显示照明及汽车等领域有较大应用前景。The melting temperature and decomposition temperature of semi-aromatic poly(pentamethylene terephthalamide)(PA5T)are close,resulting in its easy decomposition during processing.Based on the above background,the aliphatic poly(glutarylpentanediamine)(PA55)segment was introduced into the homopolymer to improves its processability.PA5T/55 with different PA55 segment contents were prepared using glutaric acid,terephthalic acid,and pentanediamine as raw materials through salt formation,pre polymerization,and solid-phase condensation method.The structure of the copolymer was confirmed using Fourier transform infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy.Based on these,the melting temperature,thermal decomposition temperature,crystallization performance,and physical and mechanical properties were tested and characterized by using differential scanning calorimetry,thermogravimetric analyzer,X-ray diffractometer,and universal testing machine.The research results show that the crystallinity and melting temperature of PA5T/55 show a downward trend with the increase of PA55 segment content.When the mole traction of 55 segments in the dibasic acid copolymer is 50%,its melting temperature is 311.40℃,the temperature for thermal degradation of 5%is 426.15℃,the maximum thermal degradation rate temperature is 474.80℃,the temperature for thermal degradation of 95%is 498.49℃,the tensile strength is 67.9 MPa,and the comprehensive performance is excellent.PA5T/55 copolymer has good heat resistance and a relatively wide processing window,and has great application prospects in fields such as electronics,LED display lighting and automobiles.

关 键 词：固相聚合 半芳香族聚酰胺 生物基材料 聚对苯二甲酰戊二胺 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业]