为提高沥青的自愈合性能,改善沥青在自愈合过程中的反应能垒,利用从废旧木材中提取出来的生物质油再生沥青,借助动态剪切流变仪(DSR)及分子模拟技术从能量角度及化学结构方面评价了生物质油再生沥青的自愈合性能。当生物质油的添加量为8...为提高沥青的自愈合性能,改善沥青在自愈合过程中的反应能垒,利用从废旧木材中提取出来的生物质油再生沥青,借助动态剪切流变仪(DSR)及分子模拟技术从能量角度及化学结构方面评价了生物质油再生沥青的自愈合性能。当生物质油的添加量为8.0wt%时,改性沥青自愈合过程中的反应能垒为32.52 k J/mol;愈合指数为0.596。结果表明:生物质油可降低沥青的反应能垒,提高沥青的疲劳寿命、愈合指数及自愈合性能。生物质油再生沥青的自愈合过程中,沥青质和胶质分子的空间构型变化不大,饱和分和芳香分分子空间构型变化较大,相互之间呈团聚之态,生物质油对沥青分子的空间构型的影响显著。展开更多
SO_4^(2-)/TiO_(2)-WO_(3)was prepared and its catalytic activity under differentsynthetic conditions was discussed with esterification of n-butanoic acid and n-butyl alcohol asprobing reaction.The optimum conditions ar...SO_4^(2-)/TiO_(2)-WO_(3)was prepared and its catalytic activity under differentsynthetic conditions was discussed with esterification of n-butanoic acid and n-butyl alcohol asprobing reaction.The optimum conditions are found that the mass fraction of H_2WO_4 used in thecompound is 12.5 percent,the calcination temperature is 580 deg C,the calcination time is 3 h,andthe soaked consistency of H_2SO_4 is 1.0 mol centre dot L^(-1).Then SO_4^(2-)/TiO_(2)-WO_(3)wasapplied as the catalyst in the catalytic synthesis of eight similar important ketals and acetalsunder the optimum conditions and revealed high catalytic activity.On condition that the molar ratioof aldehyde/ketone to glycol is 1:1.5,the mass fraction of the catalyst used in the reactants is0.5 percent,and the reaction time is 1.0 h,the yields of ketals and acetals can reach 64.2percent-95.1 percent.Moreover,it can be easily recovered and reused.展开更多
文摘为提高沥青的自愈合性能,改善沥青在自愈合过程中的反应能垒,利用从废旧木材中提取出来的生物质油再生沥青,借助动态剪切流变仪(DSR)及分子模拟技术从能量角度及化学结构方面评价了生物质油再生沥青的自愈合性能。当生物质油的添加量为8.0wt%时,改性沥青自愈合过程中的反应能垒为32.52 k J/mol;愈合指数为0.596。结果表明:生物质油可降低沥青的反应能垒,提高沥青的疲劳寿命、愈合指数及自愈合性能。生物质油再生沥青的自愈合过程中,沥青质和胶质分子的空间构型变化不大,饱和分和芳香分分子空间构型变化较大,相互之间呈团聚之态,生物质油对沥青分子的空间构型的影响显著。
基金supported by the Natural Science Foundation of Hubei Province Education Committee(Nos.2004D007and2002A00008)the National Natural Science Foundation of China(No.20471044)
文摘SO_4^(2-)/TiO_(2)-WO_(3)was prepared and its catalytic activity under differentsynthetic conditions was discussed with esterification of n-butanoic acid and n-butyl alcohol asprobing reaction.The optimum conditions are found that the mass fraction of H_2WO_4 used in thecompound is 12.5 percent,the calcination temperature is 580 deg C,the calcination time is 3 h,andthe soaked consistency of H_2SO_4 is 1.0 mol centre dot L^(-1).Then SO_4^(2-)/TiO_(2)-WO_(3)wasapplied as the catalyst in the catalytic synthesis of eight similar important ketals and acetalsunder the optimum conditions and revealed high catalytic activity.On condition that the molar ratioof aldehyde/ketone to glycol is 1:1.5,the mass fraction of the catalyst used in the reactants is0.5 percent,and the reaction time is 1.0 h,the yields of ketals and acetals can reach 64.2percent-95.1 percent.Moreover,it can be easily recovered and reused.
