Zhao Zhifeng, Tan Yueyang, Guo Shangzhen, Ni Xiuyuan
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.
Polymers (Basel). 2022 Sep 1;14(17):3626. doi: 10.3390/polym14173626.
Poly(m-xylylene adipamide) (MXD6) has good gas barrier properties and high mechanical strength. However, in nature, this resin has a low rate of crystallization. In order to overcome this obstacle in its applications, this study prepares a new, efficient modifier for MXD6 by combining the synthesized DOPO derivative (DT) and P22. It is found that the use of the binary modifier exhibits obvious effects on the crystallization of MXD6. When 11.0 wt.% DT is added together with 0.1 wt.% P22 (DT/P22), the crystallization temperature of MXD6 shifts to a higher temperature of 19.7 °C, and the crystallinity degree of MXD6 is significantly increased by 60%. Meanwhile, this modifier exhibits obviously intumescent flame-retardancy on MXD6 by increasing the limited oxygen index (LOI) from 26.4% to 33.4%. The results of the cone calorimeter test (CCT) reveal that the peak heat release rate (PHRR), total heat release (THR) and average effective heat release (av-EHC) are obviously suppressed due to the use of this modifier. Moreover, the influences of this modifier on the crystal structures, mechanical and rheological properties of MXD6 are analyzed in detail. This study can provide an efficient modifier for MXD6.
聚（间苯二甲酰己二胺）（MXD6）具有良好的气体阻隔性能和较高的机械强度。然而，在实际应用中，这种树脂的结晶速率较低。为了克服其应用中的这一障碍，本研究通过将合成的DOPO衍生物（DT）与P22相结合，制备了一种新型、高效的MXD6改性剂。研究发现，使用二元改性剂对MXD6的结晶有明显影响。当加入11.0 wt.%的DT和0.1 wt.%的P22（DT/P22）时，MXD6的结晶温度升高至19.7℃，结晶度显著提高了60%。同时，该改性剂通过将极限氧指数（LOI）从26.4%提高到33.4%，使MXD6表现出明显的膨胀阻燃性。锥形量热仪测试（CCT）结果表明，由于使用该改性剂，峰值热释放速率（PHRR）、总热释放量（THR）和平均有效热释放量（av-EHC）均受到明显抑制。此外，还详细分析了该改性剂对MXD6晶体结构、力学性能和流变性能的影响。本研究可为MXD6提供一种高效的改性剂。
