Copper metal-organic framework toward flame-retardant enhancement of thermoplastic polyurethane elastomer composites based on ammonium polyphosphate
Copper metal-organic framework toward flame-retardant enhancement of thermoplastic polyurethane elastomer composites based on ammonium polyphosphate
复制标题
铜金属有机骨架对基于聚磷酸铵的热塑性聚氨酯弹性体复合材料的阻燃增强
DOI：
10.1002/pat.5260
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发表时间：
2021-04-20
影响因子：
3.4
通讯作者：
Jiao, Chuanmei
中科院分区：
文献类型：
--
作者：
Chen, Xilei;Chen, Xihong;Jiao, Chuanmei
本文合成了金属有机骨架铜（MOF-Cu），并与聚磷酸铵（APP）协同阻燃热塑性聚氨酯（TPU）。通过锥形量热仪（CCT）、极限氧指数（LOI）、垂直燃烧试验（UL-94）、烟密度试验等研究了MOF-Cu与APP在TPU复合材料中的协同阻燃作用。MOF-Cu-0.0625与APP的协同作用进一步提高了TPU/APP的阻燃性能，其峰值热释放速率（pHRR）和总热释放速率（THR）分别比纯TPU降低了26.0%和1.3%。与纯TPU相比，TPU/APP样品的pHRR和THR值分别降低了70.3%和15.8%。在TPU/APP/Cu-0.0625样品的情况下，与TPU/APP相比，pHRR和THR值进一步降低19.2%和63.4%，因为MOF-Cu的量较少。结果表明，MOF-Cu不能抑制烟气释放，降低总烟气释放量（TSR）。而0.125wt%的MOF-Cu可使TPU/APP/Cu-0.125样品的TSR值降至227.8 m（2）/m（2），比TPU/APP低23.4%。MOF-Cu与APP通过催化碳化过程形成石墨化度和膨胀度高的炭渣层，获得良好的协同阻燃效果。
In this article, copper metal-organic framework (MOF-Cu) was synthesized and used as synergism with ammonium polyphosphate (APP) to prepare flame-retardant thermoplastic polyurethane (TPU) composites. The synergistic flame-retardant effects between MOF-Cu and APP in TPU composites were studied by cone calorimeter (CCT), limiting oxygen index tests (LOI), vertical burning tests (UL-94), smoke density test, etc. The results showed that MOF-Cu had some flame-retardant effects on TPU, and APP had good flame retardancy in TPU/APP composites. And, the flame retardancy of TPU/APP was further enhanced when MOF-Cu was used as synergism with APP. It has been found that the peak heat release rate (pHRR) and total heat release (THR) values of TPU/Cu-0.0625 sample were reduced by 26.0% and 1.3% compared with pure TPU, respectively. And the pHRR and THR values of TPU/APP sample were reduced by 70.3% and 15.8% compared with pure TPU. In the case of TPU/APP/Cu-0.0625 sample, the pHRR and THR values were furtherly reduced by 19.2% and 63.4% compared with TPU/APP, because of the minor amount of MOF-Cu. It has been found MOF-Cu cannot suppress the smoke release and reduce the total smoke release (TSR) value. However, 0.125 wt% MOF-Cu can make the TSR value of TPU/APP/Cu-0.125 sample reduce to 227.8 m(2)/m(2), which was 23.4% lower than that of TPU/APP. The good synergistic flame-retardant effect between MOF-Cu and APP was obtained by the catalyzing carbonization process to form the char residue layer with high graphitization and expansion degree.