Effects of P-N flame retardants based on cytosine on flame retardancy and mechanical properties of polyamide 6
Effects of P-N flame retardants based on cytosine on flame retardancy and mechanical properties of polyamide 6
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DOI：
10.1016/j.polymdegradstab.2020.109092
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发表时间：
2020-04-01
影响因子：
5.9
通讯作者：
Li, Juan
中科院分区：
文献类型：
--
作者：
Tao, Wei;Hu, Xu;Li, Juan
以氯二苯基膦（CDP）、二苯基膦酰氯（DPP）和胞嘧啶（Cy）分别合成了两种磷氮阻燃剂。产品被标记为CCDP和CDPP，并通过傅里叶变换红外光谱（FT-IR）、P-31和H-1核磁共振和热重分析（TGA）进行了表征。用CCDP和CDPP改性聚酰胺6 (PA6)的阻燃性能。结果表明，6 wt%的CCDP和CDPP均能使PA6达到UL-94的V-0额定值，并提高其LOI值。采用TG-IR、熔体体积流率等研究了其降解行为。结果表明，CCDP和CDPP均能促进PA6的降解，并通过熔融作用提高其阻燃性。CCDP倾向于在气相中工作，而CDPP倾向于在凝聚相中工作。此外，为了减少阻燃剂对PA6力学性能的影响，对CDPP进行了环氧树脂包覆。结果表明，涂层后的阻燃性降低。最后，将三聚氰胺氰脲酸酯与环氧包覆的CDPP共混，对PA6复合材料的综合性能进行调整，得到了优异的阻燃性能和力学性能。(C) 2020由Elsevier Ltd.出版。
Two phosphorus-nitrogen flame retardants were synthesized by using chlodiphenylphosphine (CDP) or diphenylphosphinyl chloride (DPP) and cytosine (Cy), respectively. The products are marked as CCDP and CDPP, and characterized by using Fourier transform infrared spectra (FT-IR), P-31 and H-1 nuclear magnetic resonance and thermogravimetric analysis (TGA). The CCDP and CDPP were used to modify the flame retardancy of polyamide 6 (PA6). The results indicated that 6 wt% CCDP and CDPP both make PA6 achieve the UL-94 V-0 rating and improve its LOI value. The degradation behavior was studied by TG-IR, melt volume-flow rate, etc. The results revealed that both CCDP and CDPP promote the degradation of PA6 and improve its flame retardancy by melting away. The CCDP tends to work in the gas phase and the CDPP in the condensed phase. In addition, in order to reduce the effect of flame retardant on the mechanical properties of PA6, CDPP was coated with epoxy resin. The results showed that the flame retardancy decrease after coating. Finally, melamine cyanurate was blended with the CDPP coated by epoxy to adjust the comprehensive properties of PA6 composite, and excellent flame retardancy and mechanical properties are obtained. (C) 2020 Published by Elsevier Ltd.