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首页> 外文期刊>Journal of Applied Polymer Science >Effect of sulfur in different valence on flame retardance of epoxy resin for light emitting diode
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Effect of sulfur in different valence on flame retardance of epoxy resin for light emitting diode

机译：不同价硫对发光二极管环氧树脂阻燃性的影响

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摘要

A novel phosphorus/nitrogen-containing flame retardant (DOPO-AM) was synthesized by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and acrylamide (AM) and its chemical structure was characterized. DOPO-AM was added into diglycidyl ether of bisphenol-A (DGEBA) with curing agent m-xylylenediamine (MXDA)to prepare flame retarded epoxy resin to reduce the possibility of fire. The compounds with different valences sulfur respectively replace partial DGEBA resin to study the effects of sulfur valences on the flame retardance of epoxy resins. The results indicated that DOPO-AM had excellent flame retardance for epoxy resin. When phosphorus content was only 0.75%, DGEBS resin containing DOPO-AM achieved the limiting oxygen index value of 34.55% and vertical burning test (UL-94) V-0 rating. Although sulfur element is help for refractive index of epoxy resin, sulfur element in three kinds of valences all weaken the flame retardant of epoxy resin. Improving phosphorus content is help for the synergistic effect of P-N and P-N-S. Moreover, the flame retardance is not proportional to sulfur valence, sulfide with +2 valence had the best flame retardance. However, +6 valence sulfonic with strong oxidation effect worsen the flame retardant. Simultaneous thermal analysis of thermogravimetric analyzer and differential scanning calorimeter and scanning electronic microscopy photographs verified the above conclusion.
机译：以9,10-二氢-9-氧杂-10-磷菲-10-氧化物（DOPO）和丙烯酰胺（AM）为原料，合成了一种新型磷/氮阻燃剂（DOPO-AM），并对其化学结构进行了表征。在双酚A二缩水甘油醚（DGEBA）中加入DOPO-AM和固化剂间二甲基亚胺（MXDA），制备阻燃环氧树脂，以降低着火的可能性。用不同硫价的化合物分别取代部分DGEBA树脂，研究硫价对环氧树脂阻燃性能的影响。结果表明，DOPO-AM对环氧树脂具有优异的阻燃性能。当磷含量仅为0.75%时，含有DOPO-AM的DGEBS树脂达到了极限氧指数34.55%和垂直燃烧试验（UL-94）V-0评级。虽然硫元素有助于提高环氧树脂的折射率，但三种价态的硫元素都会削弱环氧树脂的阻燃性。提高磷含量有助于P-N和P-N-S的协同作用。此外，阻燃性与硫价不成正比，以+2价的硫化物阻燃效果最好。然而，具有强氧化作用的+6价磺酸会使阻燃剂性能恶化。热重分析仪和差示扫描量热仪的同时热分析以及扫描电镜照片验证了上述结论。

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