The polycondensation of the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline(molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize poly(amido-o-hydrox...The polycondensation of the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline(molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize poly(amido-o-hydroxy amide)(POA-F)-new heat resistant binder of the composites for microelectronics. The copolymer was fractionated, its hydrodynamic, optical, and conformational properties were researched, and molecular masses(ММ) of the fractions were defined. The polydispersity index was estimated. Based on experimental data, calculation of the size of a segment of Kuhn characterizing degree of an intramolecular orientation order and value of coefficients of the equation of Mark-Kuhn-Hauvink for viscometric and diffusion data were performed. It was demonstrated that introducing 20 mol % of the monomer with-CF3-groups does not lead to any changes in conformational properties of the macromolecules and does not change the degree of intramolecular orientational order(the Kuhn segment length). Optical characteristics of POA-F solutions are virtually similar to the corresponding values for POA prepared with the use of single amine-containing component-5,5-methylene bis(2-aminophenol). The received MM distribution for POA-F(prepolymer) provided the solubility of its films in alkaline solutions. The heat resistance(τ5 and τ10-temperatures corresponding to 5% and of 10% PBO-F mass loss of a polymer) of the powders and the films of PBO, PBO-F were determined. The electrophysical parameters-dielectric permittivity(ε) and dielectric loss tangent(tan δ) of the PBO-F films decreased down to 3.30 and 0.017, in comparison 3.40 and 0.025 for PBO respectively.展开更多
目的探讨直接节段多频生物电阻抗分析(DSM-BIA)技术在血液透析(MHD)患者干体质量评估中的应用价值。方法选取行规律MHD治疗3个月以上的非住院患者88例,应用Kraemer评分表观察患者症状体征,根据血容量减少症状、容量状态及有无负荷过重...目的探讨直接节段多频生物电阻抗分析(DSM-BIA)技术在血液透析(MHD)患者干体质量评估中的应用价值。方法选取行规律MHD治疗3个月以上的非住院患者88例,应用Kraemer评分表观察患者症状体征,根据血容量减少症状、容量状态及有无负荷过重等情况进行严格的临床干体质量调整管控,直至Kraemer评分为0分且持续1周,并将此时的透后体质量作为临床评估干体质量(DWclin)。采用直接节段多频生物电阻抗分析仪测量MHD患者透析前后相关参数,并通过包含年龄、透析后上肢在50 k Hz时的电阻抗数值(R50)、身高以及透后BMI等参数的CB公式计算干体质量(DWDSM-BIA–CB)。观察MHD患者透析前后不同部位的DWDSM-BIA–CB值差异,并绘制Bland-Altman图对2种干体质量评估方法评估值进行一致性分析。结果 MHD患者血液透析前后躯干部R50水平均显著低于内瘘对侧上肢R50、下肢R50(P<0.01);血液透析后内瘘对侧上肢R50、躯干R50、下肢R50分别较透析前显著升高(P<0.05);本组DWclin平均(66.3±13.2)kg,Bland-Altman图形分析显示DWclin和男/女性MHD的DWDSM-BIA–CB值一致性均较好。本组血透中仅有2例老年终末期肾病患者出现感染症状。结论 DSM-BIA技术能较好反映血透患者的容量负荷,结合严格的临床管控结果可进行准确的干体质量评估,对指导临床血透方案、降低并发症等具有显著应用价值。展开更多
The present paper deals with two new ethmid moths from China: Ethmia damaoshanae sp.nov. and Ethmia jingdongensis sp.nov. Another two species Ethmia dodecea (Haworth) and Ethmia ultima Sattler are reported for the f...The present paper deals with two new ethmid moths from China: Ethmia damaoshanae sp.nov. and Ethmia jingdongensis sp.nov. Another two species Ethmia dodecea (Haworth) and Ethmia ultima Sattler are reported for the first time from the country. The genitalia of the new species are figured.展开更多
基金Funded by the Ministry of Education and Science of the Russian Federation(No.10.7608.2017/8.9).
文摘The polycondensation of the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline(molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize poly(amido-o-hydroxy amide)(POA-F)-new heat resistant binder of the composites for microelectronics. The copolymer was fractionated, its hydrodynamic, optical, and conformational properties were researched, and molecular masses(ММ) of the fractions were defined. The polydispersity index was estimated. Based on experimental data, calculation of the size of a segment of Kuhn characterizing degree of an intramolecular orientation order and value of coefficients of the equation of Mark-Kuhn-Hauvink for viscometric and diffusion data were performed. It was demonstrated that introducing 20 mol % of the monomer with-CF3-groups does not lead to any changes in conformational properties of the macromolecules and does not change the degree of intramolecular orientational order(the Kuhn segment length). Optical characteristics of POA-F solutions are virtually similar to the corresponding values for POA prepared with the use of single amine-containing component-5,5-methylene bis(2-aminophenol). The received MM distribution for POA-F(prepolymer) provided the solubility of its films in alkaline solutions. The heat resistance(τ5 and τ10-temperatures corresponding to 5% and of 10% PBO-F mass loss of a polymer) of the powders and the films of PBO, PBO-F were determined. The electrophysical parameters-dielectric permittivity(ε) and dielectric loss tangent(tan δ) of the PBO-F films decreased down to 3.30 and 0.017, in comparison 3.40 and 0.025 for PBO respectively.
文摘目的探讨直接节段多频生物电阻抗分析(DSM-BIA)技术在血液透析(MHD)患者干体质量评估中的应用价值。方法选取行规律MHD治疗3个月以上的非住院患者88例,应用Kraemer评分表观察患者症状体征,根据血容量减少症状、容量状态及有无负荷过重等情况进行严格的临床干体质量调整管控,直至Kraemer评分为0分且持续1周,并将此时的透后体质量作为临床评估干体质量(DWclin)。采用直接节段多频生物电阻抗分析仪测量MHD患者透析前后相关参数,并通过包含年龄、透析后上肢在50 k Hz时的电阻抗数值(R50)、身高以及透后BMI等参数的CB公式计算干体质量(DWDSM-BIA–CB)。观察MHD患者透析前后不同部位的DWDSM-BIA–CB值差异,并绘制Bland-Altman图对2种干体质量评估方法评估值进行一致性分析。结果 MHD患者血液透析前后躯干部R50水平均显著低于内瘘对侧上肢R50、下肢R50(P<0.01);血液透析后内瘘对侧上肢R50、躯干R50、下肢R50分别较透析前显著升高(P<0.05);本组DWclin平均(66.3±13.2)kg,Bland-Altman图形分析显示DWclin和男/女性MHD的DWDSM-BIA–CB值一致性均较好。本组血透中仅有2例老年终末期肾病患者出现感染症状。结论 DSM-BIA技术能较好反映血透患者的容量负荷,结合严格的临床管控结果可进行准确的干体质量评估,对指导临床血透方案、降低并发症等具有显著应用价值。
文摘The present paper deals with two new ethmid moths from China: Ethmia damaoshanae sp.nov. and Ethmia jingdongensis sp.nov. Another two species Ethmia dodecea (Haworth) and Ethmia ultima Sattler are reported for the first time from the country. The genitalia of the new species are figured.
