目的研究不同固化模式对临床常用的两种双固化树脂水门汀表面纳米硬度、弹性模量、压入蠕变等微观机械性能及聚合程度的影响。方法采用即刻光照、间歇光照、延迟光照和无光照四种不同的固化模式,分别对Rely X Unicem、Perma Cem 2.0两...目的研究不同固化模式对临床常用的两种双固化树脂水门汀表面纳米硬度、弹性模量、压入蠕变等微观机械性能及聚合程度的影响。方法采用即刻光照、间歇光照、延迟光照和无光照四种不同的固化模式,分别对Rely X Unicem、Perma Cem 2.0两种双固化树脂水门汀进行固化,制备厚度为0.5 mm、直径5 mm的圆形测试试件。室温避光保存24 h后,使用纳米压痕法对表面纳米硬度、弹性模量、压入蠕变等微观机械性能进行测量,使用傅立叶变换红外光谱-衰减全发射法测试材料的转化率。利用SPSS 16.0软件对数据进行分析(α=0.05)。结果固化模式对本实验选用的两种双固化树脂水门汀的表面纳米硬度、弹性模量有显著影响(P<0.001)。对于Rely X Unicem,无光照组的表面纳米硬度、弹性模量最低,分别为(153.1±14.6)MPa和(7.6±0.7)GPa,即刻、间歇、延迟光照组差异无统计学意义。对于Perma Cem 2.0,无光照组的表面纳米硬度、弹性模量最低,分别为(244.8±21.1)MPa和(7.3±0.5)GPa,即刻、间歇、延迟光照组差异无统计学意义。固化模式对Rely X Unicem的压入蠕变有显著影响(F=135.41,P<0.001),对Perma Cem 2.0也有显著影响(F=148.94,P<0.001),其由高到低依次为:无光照组>延迟光照组>即刻、间歇光照组。固化模式对Perma Cem 2.0的转化率有显著影响(F=20.76,P=0.004),但对Rely X Unicem的转化率无显著影响(F=0.899,P=0.447)。结论双固化树脂水门汀在无光照时容易固化不全,降低其微观机械性能。即刻、间歇光照比延迟光照更有利于降低树脂水门汀的压入蠕变。固化模式对不同种类的双固化树脂水门汀聚合程度及微观机械性能的影响程度不同。展开更多
We have synthesized styrene-acrylic latex and investigated the effect of such reaction conditions as the dosage of initiator, surfactant and stirring speed on monomer conversion and glass transition temperature (Tg) o...We have synthesized styrene-acrylic latex and investigated the effect of such reaction conditions as the dosage of initiator, surfactant and stirring speed on monomer conversion and glass transition temperature (Tg) of polymer by means of orthogonal experiment, then we get the best reaction conditions. Test results prove that the glass transition temperature of the polymer is directly related to the monomer con- version. The improvement of monomer conver- sion can make the glass transition temperature close to the theoretical value. In the case of high final conversion, we can predict the glass transition temperature of the polymers of different composition according to the theoretical relation effectively.展开更多
文摘目的研究不同固化模式对临床常用的两种双固化树脂水门汀表面纳米硬度、弹性模量、压入蠕变等微观机械性能及聚合程度的影响。方法采用即刻光照、间歇光照、延迟光照和无光照四种不同的固化模式,分别对Rely X Unicem、Perma Cem 2.0两种双固化树脂水门汀进行固化,制备厚度为0.5 mm、直径5 mm的圆形测试试件。室温避光保存24 h后,使用纳米压痕法对表面纳米硬度、弹性模量、压入蠕变等微观机械性能进行测量,使用傅立叶变换红外光谱-衰减全发射法测试材料的转化率。利用SPSS 16.0软件对数据进行分析(α=0.05)。结果固化模式对本实验选用的两种双固化树脂水门汀的表面纳米硬度、弹性模量有显著影响(P<0.001)。对于Rely X Unicem,无光照组的表面纳米硬度、弹性模量最低,分别为(153.1±14.6)MPa和(7.6±0.7)GPa,即刻、间歇、延迟光照组差异无统计学意义。对于Perma Cem 2.0,无光照组的表面纳米硬度、弹性模量最低,分别为(244.8±21.1)MPa和(7.3±0.5)GPa,即刻、间歇、延迟光照组差异无统计学意义。固化模式对Rely X Unicem的压入蠕变有显著影响(F=135.41,P<0.001),对Perma Cem 2.0也有显著影响(F=148.94,P<0.001),其由高到低依次为:无光照组>延迟光照组>即刻、间歇光照组。固化模式对Perma Cem 2.0的转化率有显著影响(F=20.76,P=0.004),但对Rely X Unicem的转化率无显著影响(F=0.899,P=0.447)。结论双固化树脂水门汀在无光照时容易固化不全,降低其微观机械性能。即刻、间歇光照比延迟光照更有利于降低树脂水门汀的压入蠕变。固化模式对不同种类的双固化树脂水门汀聚合程度及微观机械性能的影响程度不同。
文摘We have synthesized styrene-acrylic latex and investigated the effect of such reaction conditions as the dosage of initiator, surfactant and stirring speed on monomer conversion and glass transition temperature (Tg) of polymer by means of orthogonal experiment, then we get the best reaction conditions. Test results prove that the glass transition temperature of the polymer is directly related to the monomer con- version. The improvement of monomer conver- sion can make the glass transition temperature close to the theoretical value. In the case of high final conversion, we can predict the glass transition temperature of the polymers of different composition according to the theoretical relation effectively.
