Flame-retardant epoxy resin with good smoke-suppression endowed by chitosan–cobalt/phosphorus complex

Chitosan-based flame-retardant CS–Co–DOPA (CCD) was synthesized by the neutralization reaction of 10-hydroxy-9,10-dihydro-9-oxo-10-phosphaphenanthrene-10-oxide (DOPA) with chitosan-cobalt complex and fully characterized by scanning electron microscopy (SEM), energy-dispersive spectrometer, x-ray diffraction, X-ray photoelectron spectroscopy (XPS), optical emission spectrometer, and Fourier transform infrared (FTIR) characterizations. The epoxy resin (EP) modified with CCD exhibited good flame retardancy. With the addition of 5 wt% CCD, the EP/CCD achieved UL-94 V-1 rating and possessed limiting oxygen index (LOI) value of 30%. Cone calorimetry (CC) test demonstrated that EP/CCD resulted in a remarkable reduction of peak smoke production rate (pSPR) and total smoke production (TSP) by 63% and 40%, respectively, showing an outstanding smoke suppression. The char residue obtained from the CC test was further characterized using SEM, FTIR, Raman, and XPS techniques. The results revealed that CCD facilitated the formation of a dense and compact char layer on EP during combustion, thereby impeding gas and heat transfer. In addition, TG-IR was employed to investigate the gas-phase flame-retardant effect of EP/CCD composites, which revealed that CCD promotes the release of water, CO_2, and other incombustible gases, altering the decomposition path of EP.     

毛细管气相色谱法同时测定三氯乙烯及其脱氯产物

建立了一种同时测定水中三氯乙烯及其脱氯产物的气相色谱检测方法。采用顶空进样,毛细管柱分离,氢火焰离子化检测器检测,保留时间定性,峰面积定量。以三因子三水平正交试验法确定了最佳检测条件,各组分线性良好(R20.998),相对标准偏差3.79%~9.14%,平均加标回收率97.68%~119.18%。对氯代烯烃而言,灵敏度虽较电子捕获检测器低,但新方法操作简便、快速、干扰少、准确度也较高,能满足三氯乙烯污染修复中反应物及中间产物的检测要求。     

Facile growth of 1‐D nanowire‐based WO3 thin films with enhanced photoelectrochemical performance

A flame reactor embedded with a constant tungsten wire feeding system to prepare one‐dimensional (1‐D) nanostructured tungsten oxide thin film for photoelectrochemical (PEC) water splitting was developed. Photoactive vertically‐aligned nanowire‐based WO₃ thin films could be obtained with a controlled thickness via a flame vapor deposition process followed by air‐annealing. The PEC performances of WO₃ photoelectrodes for different thin film thicknesses were examined. The optimum thickness of WO₃ thin film was found to be about 7.2 μm for PEC water splitting based on incident photon‐to‐current efficiency plots and I–V curves. The WO₃ prepared with optimum thickness showed better PEC performance than those of recently reported nanostructured WO₃ photoanodes. © 2015 American Institute of Chemical Engineers AIChE J, 62: 421–428, 2016     

振动磨混合时间对气体发生剂性能的影响研究

研究了振动磨不同研磨混合时间对安全气囊气体发生剂中各组分的混合均匀性和产品一致性的影响,此外,还通过气体发生剂与气体发生器匹配后进行的压力性能测试、火焰试验以及残渣试验,考查了振动磨研磨混合时间对气体发生剂性能的影响,为实际生产中振动磨研磨混合时间的确定提供了一定的参考依据。     

阻燃性软质聚氨酯泡沫塑料的研制

以自制的聚醚多元醇为原料，加入经粉碎并表面处理的三聚氰胺和阻燃剂Ｔ２０１制得阻燃性软质聚氨酯泡沫塑料。系统地考察了配方中的两种阻燃剂用量，特种聚醚多元醇和泡沫密度对泡沫塑料阻燃性和物理性能的影响。     

NLD系列阻燃剂的气相色谱分析

本文研究了NLD系列阻燃剂的气相色谱分析方法。采用双火焰光度检测器,选择最佳色谱操作条件。并以磷酸三丁酯为内标物,连行了内标去定量。实验结果表明,NLD—01型阻燃剂和NLD—02型阻燃剂的线性范围分别为0.4～1.0mg/ml和0.2～0.5mg/ml。用本文所研究的方法,测试了不同批号的阻燃剂试样,其相对标准偏差均小于2%。     

Thermodynamic Analysis of Burning Resistivity of Ti-Cr-V-Mo Alloys

ＴｈｅｒｍｏｄｙｎａｍｉｃＡｎａｌｙｓｉｓｏｆＢｕｒｎｉｎｇＲｅｓｉｓｔｉｖｉｔｙｏｆＴｉＣｒＶＭｏＡｌｏｙｓ①ＬｉｕＹｕｑｉｎ，ＺｈｕａｎｇＷｅｉｄｏｎｇ，ＢａｉＫｅｗｕ，ＳｈｅｎＪｉａｎｙｕｎ②ａｎｄＺｈａｎｇＺｈｕ（刘玉芹）（庄卫东）（白...     

磷系列新结构环保型阻燃聚酯研究进展

聚酯(PET)具有良好的物理性能,耐摩擦,绝缘性好,冲击强度高,尺寸稳定性好,吸湿性小,电性能好,耐溶剂等优点.但是,和大多数高分子材料一样,PET具有可燃性,氧指数较低等弱点.另外,随着环保要求的不断提升和人们环境意识的逐渐提高,研究和开发环保型阻燃聚酯受到了广泛的关注.而含磷阻燃剂在高温时形成具有P=O和P-O或P...