为提供一种电子电器产品中橡胶制品的TVOC监控手段,采用气相色谱-质谱法建立了测定橡胶制品中二丁基胺含量的检测方法。以甲醇作为液液萃取的提取剂,进行超声波提取,采用Aglient HP ULTRA 2色谱柱进行分离,质谱分析采用电子轰击离子源(E...为提供一种电子电器产品中橡胶制品的TVOC监控手段,采用气相色谱-质谱法建立了测定橡胶制品中二丁基胺含量的检测方法。以甲醇作为液液萃取的提取剂,进行超声波提取,采用Aglient HP ULTRA 2色谱柱进行分离,质谱分析采用电子轰击离子源(EI),选择离子监测(SIM)模式。数据显示,二丁基胺在甲醇中的含量与其特征离子峰面积呈线性关系。空白样品中的平均回收率为95.3%~100.2%,相对标准偏差(RSD,n=7)为0.8%~2.6%,测定低限为0.085 mg/kg。测试洗衣机观察窗样品中二丁基胺含量,测试结果显示含量较高,在室内使用存在空气污染的风险隐患,高温下烘烤更为严重,长期以往影响人体健康。展开更多
A kinetic model was developed to describe the atom transfer radical polymerization (ATRP) of 2(N,N-dimethylarnino) ethyl methacrylate (DMAEMA). The model was based on a polymerization mechanism, which included the ato...A kinetic model was developed to describe the atom transfer radical polymerization (ATRP) of 2(N,N-dimethylarnino) ethyl methacrylate (DMAEMA). The model was based on a polymerization mechanism, which included the atom transfer equilibrium for primary radical, the propagation of growing polymer radical, and the atom transfer equilibrium for the growing polymer radical. An experiment was carried out to measure the conversion of monomer, the number-average molecular weight of polymer and molecular weight distribution for the ATRP process of DMAEMA. The experimental data were used to correlate the kinetic model and rate constants were obtained. The rate constants of activation and deactivation in the atom transfer equilibrium for primary radical are 1.0 x 10(4) L(.)mol(-1.)s(-1) and 0.04 L(.)mol(-1.)s(-1), respectively. The rate constant of the propagation of growing polymer radical is 8.50 L(.)mol(-1.)s(-1), and the rate constants of activation and deactivation in the atom transfer equilibrium for growing polymer radical are 0.045 L(.)mol(-1.)s(-1) and 1.2 x 10(5) L(.)mol(-1.)s(-1), respectively. The values of the rate constants represent the features of the ATRP process. The kinetic model was used to calculate the ATRP process of DMAEMA. The results show that the calculations agree well with the measurements.展开更多
By oxidative polycondensation of 1-naphthol and their copolycondensation with aniline or p-phenylenediamine the polyfucntional polyconjugated oligomers consisting of hydroxynaphthylene links have been prepared. These ...By oxidative polycondensation of 1-naphthol and their copolycondensation with aniline or p-phenylenediamine the polyfucntional polyconjugated oligomers consisting of hydroxynaphthylene links have been prepared. These soluble and meltable oligomers showing thermostability, semiconducting and paramagnetic properties and also high reactivity at reactions characteristic for aromatic hydroxyl groups were used as active filler at preparation of rubbers from butyl and butadiene-nitrile rubbers. It has been shown that in partial or full substitution of carbon black by oligohydroxynaphthylenes or cooligohydroxynaphthylenephenylamines in composition of vulcanizate the prepared rubbers are characterized by noticeably high heat-physical, physical-mechanical and electrical properties （Pv = 10^8 - 10^6Om. cm ）.展开更多
文摘为提供一种电子电器产品中橡胶制品的TVOC监控手段,采用气相色谱-质谱法建立了测定橡胶制品中二丁基胺含量的检测方法。以甲醇作为液液萃取的提取剂,进行超声波提取,采用Aglient HP ULTRA 2色谱柱进行分离,质谱分析采用电子轰击离子源(EI),选择离子监测(SIM)模式。数据显示,二丁基胺在甲醇中的含量与其特征离子峰面积呈线性关系。空白样品中的平均回收率为95.3%~100.2%,相对标准偏差(RSD,n=7)为0.8%~2.6%,测定低限为0.085 mg/kg。测试洗衣机观察窗样品中二丁基胺含量,测试结果显示含量较高,在室内使用存在空气污染的风险隐患,高温下烘烤更为严重,长期以往影响人体健康。
文摘A kinetic model was developed to describe the atom transfer radical polymerization (ATRP) of 2(N,N-dimethylarnino) ethyl methacrylate (DMAEMA). The model was based on a polymerization mechanism, which included the atom transfer equilibrium for primary radical, the propagation of growing polymer radical, and the atom transfer equilibrium for the growing polymer radical. An experiment was carried out to measure the conversion of monomer, the number-average molecular weight of polymer and molecular weight distribution for the ATRP process of DMAEMA. The experimental data were used to correlate the kinetic model and rate constants were obtained. The rate constants of activation and deactivation in the atom transfer equilibrium for primary radical are 1.0 x 10(4) L(.)mol(-1.)s(-1) and 0.04 L(.)mol(-1.)s(-1), respectively. The rate constant of the propagation of growing polymer radical is 8.50 L(.)mol(-1.)s(-1), and the rate constants of activation and deactivation in the atom transfer equilibrium for growing polymer radical are 0.045 L(.)mol(-1.)s(-1) and 1.2 x 10(5) L(.)mol(-1.)s(-1), respectively. The values of the rate constants represent the features of the ATRP process. The kinetic model was used to calculate the ATRP process of DMAEMA. The results show that the calculations agree well with the measurements.
文摘By oxidative polycondensation of 1-naphthol and their copolycondensation with aniline or p-phenylenediamine the polyfucntional polyconjugated oligomers consisting of hydroxynaphthylene links have been prepared. These soluble and meltable oligomers showing thermostability, semiconducting and paramagnetic properties and also high reactivity at reactions characteristic for aromatic hydroxyl groups were used as active filler at preparation of rubbers from butyl and butadiene-nitrile rubbers. It has been shown that in partial or full substitution of carbon black by oligohydroxynaphthylenes or cooligohydroxynaphthylenephenylamines in composition of vulcanizate the prepared rubbers are characterized by noticeably high heat-physical, physical-mechanical and electrical properties （Pv = 10^8 - 10^6Om. cm ）.
