On the early reaction stages of ozone with N,N′-substituted p-phenylenediamines (6PPD, 77PD) and N,N′,N"-substituted-1,3,5-triazine "Durazone®" : An electron spin resonance (ESR) and electronic absorption spectroscopy study
On the early reaction stages of ozone with N,N′-substituted p-phenylenediamines (6PPD, 77PD) and N,N′,N"-substituted-1,3,5-triazine "Durazone®" : An electron spin resonance (ESR) and electronic absorption spectroscopy study
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DOI：
10.1016/j.polymdegradstab.2014.11.011
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发表时间：
2015-01-01
影响因子：
5.9
通讯作者：
Ebenezer, Warren
中科院分区：
文献类型：
--
作者：
Cataldo, Franco;Faucette, Brad;Ebenezer, Warren
利用电子自旋共振（ESR）和电子吸收光谱（UV-VIS）研究了室温下臭氧与N，N'-取代对苯二胺6PPD和77PD以及烷基-对苯二胺取代三嗪（PPDTZ）在乙醇和酸性乙醇溶液中的早期反应机理。结果表明，6PPD和77PD均通过电子转移机制与臭氧发生反应，分别生成离子6PPD（+中心点）和77PD（+中心点），用ESR和UV-VIS检测得到。6PPD（+中心点）和77PD（+中心点）在酸性乙醇中稳定且检测清晰。在6PPD的情况下，臭氧化也得到了相对氮氧基自由基，用ESR检测。PPDTZ在乙醇中与臭氧反应，得到一个硝基自由基，用ESR和紫外可见光谱检测。臭氧化PPDTZ溶液中未检测到自由基阳离子。
The early stages of the reaction mechanism of ozone with N,N'-substituted p-phenylenediamines 6PPD and 77PD as well as the alkyl-p-phenylenediamine substituted sym-triazine (PPDTZ) commercially known as "DURAZONE" were investigated at room temperature in ethanol and acidic ethanol solutions with electron spin resonance (ESR) and electronic absorption spectroscopy (UV-VIS). It was found that both 6PPD and 77PD react with ozone through the electron transfer mechanism giving the respective radical cations 6PPD (+center dot) and 77PD(+center dot) which were detected with ESR and with UV-VIS. It was also found that 6PPD(+center dot) and 77PD(+center dot) are stabilized and clearly detected in acidic ethanol. In the case of 6PPD ozonation also gave the relative nitroxyl radical which was detected with ESR. PPDTZ was reacted with ozone in ethanol to give a nitroxyl radical detected with ESR and with UV-VIS spectroscopy. No radical cation was detected on ozonated PPDTZ solutions.