Carbon nanotubes have stable structrue that is the similar to alkene.However,it is very difficult that carbon nanotubes have the same addition reaction as alkene.By infrared spectrum,it has been proved that there is a...Carbon nanotubes have stable structrue that is the similar to alkene.However,it is very difficult that carbon nanotubes have the same addition reaction as alkene.By infrared spectrum,it has been proved that there is addition reaction between carbon nanotubes and BPO.Moreover,we found,the frequency of carbonyl in BPO decreased from 1760-1780 cm-1to 1702 cm-1.It was also shown by TG the weight loss varied with reaction time and reagent proportion.展开更多
The polystyrenylphosphonous acid (PSPA) of low polymerization degree was prepared with one step reaction. The reaction mechanism was changed with different initiators. For the reaction with AIBN or BPO as the initia...The polystyrenylphosphonous acid (PSPA) of low polymerization degree was prepared with one step reaction. The reaction mechanism was changed with different initiators. For the reaction with AIBN or BPO as the initiator, there are 2 or 3 series of radical reaction chains and 5 or 9 series of polystyrenyl products. The main products are PSPA without or with the fragment of the initiator H[CH(C6H5)-CH2]n-PO2H2 and C6H5CO2-[CH2CH (C6H5)]n-PO2H2 respectively.展开更多
以甲基丙烯酸甲酯(MMA)为单体、过氧化苯甲酰(BPO)和N,N-二甲基苯胺(DMA)组成的氧化-还原体系为引发剂,采用85℃预聚、24℃后聚和120℃处理工艺进行自由基本体聚合制备了聚甲基丙烯酸甲酯(PMMA)。研究DMA用量、BPO与DMA配比对PMMA透光...以甲基丙烯酸甲酯(MMA)为单体、过氧化苯甲酰(BPO)和N,N-二甲基苯胺(DMA)组成的氧化-还原体系为引发剂,采用85℃预聚、24℃后聚和120℃处理工艺进行自由基本体聚合制备了聚甲基丙烯酸甲酯(PMMA)。研究DMA用量、BPO与DMA配比对PMMA透光率、硬度、强度和热分解温度的影响。研究发现,DMA可明显改善PMMA的力学性能和热学性能,降低其透光率,但不影响透明度。结果表明,当DMA用量3%、BPO与DMA配比0.53∶1时,PMMA硬度为94HD、抗弯强度为66.8 MPa、冲击强度为13.2 k J/m2、初始分解温度为273℃、结束分解温度为404.8℃,380～800 nm的平均透光率为82%以上,综合性能最优。并应用设定的聚合工艺和优化的配方,在低温低压条件下,制备出微米孔结构PMMA,为聚合物微发泡提供了一种新的制备方法。展开更多
用溶剂二次提取技术对小麦粉中过氧化苯甲酰提取方法进行研究,高锰酸钾-鲁米诺化学发光体系对该方法的提取率进行测定。研究发现采用无水乙醇进行首次提取,95%乙醇进行二次提取能显著提高小麦粉中过氧化苯甲酰的提取率。最佳提取条件为...用溶剂二次提取技术对小麦粉中过氧化苯甲酰提取方法进行研究,高锰酸钾-鲁米诺化学发光体系对该方法的提取率进行测定。研究发现采用无水乙醇进行首次提取,95%乙醇进行二次提取能显著提高小麦粉中过氧化苯甲酰的提取率。最佳提取条件为:无水乙醇提取固液比1︰7、提取时间15 min,5 mL 95%的乙醇提取10 min,此条件下所得最高提取率90.7%。展开更多
文摘Carbon nanotubes have stable structrue that is the similar to alkene.However,it is very difficult that carbon nanotubes have the same addition reaction as alkene.By infrared spectrum,it has been proved that there is addition reaction between carbon nanotubes and BPO.Moreover,we found,the frequency of carbonyl in BPO decreased from 1760-1780 cm-1to 1702 cm-1.It was also shown by TG the weight loss varied with reaction time and reagent proportion.
文摘The polystyrenylphosphonous acid (PSPA) of low polymerization degree was prepared with one step reaction. The reaction mechanism was changed with different initiators. For the reaction with AIBN or BPO as the initiator, there are 2 or 3 series of radical reaction chains and 5 or 9 series of polystyrenyl products. The main products are PSPA without or with the fragment of the initiator H[CH(C6H5)-CH2]n-PO2H2 and C6H5CO2-[CH2CH (C6H5)]n-PO2H2 respectively.
文摘以甲基丙烯酸甲酯(MMA)为单体、过氧化苯甲酰(BPO)和N,N-二甲基苯胺(DMA)组成的氧化-还原体系为引发剂,采用85℃预聚、24℃后聚和120℃处理工艺进行自由基本体聚合制备了聚甲基丙烯酸甲酯(PMMA)。研究DMA用量、BPO与DMA配比对PMMA透光率、硬度、强度和热分解温度的影响。研究发现,DMA可明显改善PMMA的力学性能和热学性能,降低其透光率,但不影响透明度。结果表明,当DMA用量3%、BPO与DMA配比0.53∶1时,PMMA硬度为94HD、抗弯强度为66.8 MPa、冲击强度为13.2 k J/m2、初始分解温度为273℃、结束分解温度为404.8℃,380～800 nm的平均透光率为82%以上,综合性能最优。并应用设定的聚合工艺和优化的配方,在低温低压条件下,制备出微米孔结构PMMA,为聚合物微发泡提供了一种新的制备方法。
文摘用溶剂二次提取技术对小麦粉中过氧化苯甲酰提取方法进行研究,高锰酸钾-鲁米诺化学发光体系对该方法的提取率进行测定。研究发现采用无水乙醇进行首次提取,95%乙醇进行二次提取能显著提高小麦粉中过氧化苯甲酰的提取率。最佳提取条件为:无水乙醇提取固液比1︰7、提取时间15 min,5 mL 95%的乙醇提取10 min,此条件下所得最高提取率90.7%。
