TDI/BPO改性PBS的力学性能研究

本文采用扩链手段和交联手段对PBS进行改性研究.分别选用甲苯2,4-二异氰酸酯(TDI)为扩链剂,过氧化苯甲酰(BPO)为交联剂.使用乌氏黏度计、索氏抽提器对改性体系的特性黏数和交联度进行测定;使用哈克转矩流变仪、毛细管流变仪、差示扫描量热仪、万能拉力测试机等手段测试了改性体系的加工性能,流变性能,结晶与热性能,以及力...

Study on mechanical properties of PBS modified by TDI/BPO

Some methods such as chain extending and cross-linking were used to the PBS modification research.TDI was chosen as chain extender while BPO was chosen as crosslinking agent.Ubbelohde viscometer and extraction apparatus were used to measure intrinsic viscosity and crosslinking degree of the modified system.Meanwhile,processing property,rheological property,crystallization and thermal property,and mechanical properties were studied by Haake torque rheometer,capillary rheometer,differential scanning calorimetry and universal tension testing machine.The effects of TDI and BPO content on system properties were also researched.The results showed that,the intrinsic viscosity of the PBS modified system increased gradually with the increase of TDI content,the balance torque of processing system and the melt strength increased,melt viscosity also had a increasing trendency.By chain extending reaction,crystallization temperature and melting point increased while the degree of crystallinity decreased.Tensile strength had little change,when the content of TDI is 1.0%,tensile strength was the greatest.Besides,with the content increasing of BPO,the PBS modifying system,s crosslinking degree increased,processing property was improved,melt viscosity and melt strength increased greatly.The increase of crosslinking degree made crystallization temperature increased,the degree of crystallinity and melting point decreased,tensile strength had a tendency of first increasing and then decreasing.