Montmorillonite (MMT) was modified through intercalative polymerization of phenol and formaldehyde catalyzed by oxalic acid. The modified montmorillonite was delaminated at large, as demonstrated by XRD and TEM studi...Montmorillonite (MMT) was modified through intercalative polymerization of phenol and formaldehyde catalyzed by oxalic acid. The modified montmorillonite was delaminated at large, as demonstrated by XRD and TEM studies. It can disperse easily in epoxy resin to form exfoliated nanocomposites. The nanoscale silicate platelets dispersed in water can be metallized by silver deposition.展开更多
以自制苯酚-亚联苯型酚醛树脂、环氧氯丙烷为主要原料,采用固体碱作为醚化阶段催化剂,合成了一种苯酚-亚联苯型环氧树脂。借助红外光谱(FTIR)、核磁共振光谱(1 H NMR和13C NMR)、凝胶渗透色谱(GPC)分别对产物的结构、组成和分子量进行...以自制苯酚-亚联苯型酚醛树脂、环氧氯丙烷为主要原料,采用固体碱作为醚化阶段催化剂,合成了一种苯酚-亚联苯型环氧树脂。借助红外光谱(FTIR)、核磁共振光谱(1 H NMR和13C NMR)、凝胶渗透色谱(GPC)分别对产物的结构、组成和分子量进行了表征,结果成功制备了苯酚-亚联苯型环氧树脂,相对分子质量为870,环氧当量为274g/eq。此外,将所得苯酚-亚联苯型环氧树脂用于环氧模塑料中,并与市售环氧树脂所得的模塑料进行比较,借助热失重分析仪(TGA)、热机械分析仪(TMA)等对模塑料的主要性能进行研究,结果表明含有苯酚-亚联苯型环氧树脂的模塑料具有较长的凝胶时间和流动长度,具有较高的Tg(142℃)以及较高的初始降解温度(413℃),完全可以满足无铅焊料的加工工艺要求,并具有较好的弯曲强度和弯曲模量。展开更多
The synergistic effect of phosphorus oxynitride（PON） with a novolac-based char former modified by salification （NA-metal salt） on the flame retardance of polyamide 6（PA6） was investigated.For this purpose,variou...The synergistic effect of phosphorus oxynitride（PON） with a novolac-based char former modified by salification （NA-metal salt） on the flame retardance of polyamide 6（PA6） was investigated.For this purpose,various flame-retardant PA6 systems were melt-compounded with PON,PON/NA,PON/NA-V_2O_5 and PON/NA-Fe_2O_3,and their flame retardance was evaluated by measuring the limiting oxygen index（LOI） values and UL-94 vertical burning ratings.The results showed that,compared with the PA6/PON/NA system,the combination of two char formers（NA-V_2O_5,NA-Fe_2O_3） with PON could obviously improve the char formation and flame retardance of PA6.The flame retardance and cone calorimetric analyses showed the stronger synergism as well as the better flame retardant performance of PON/NA-Fe_2O_3 flame retardant system. The effects of different char formers on the flame retardance and thermal stability of this system were also discussed.展开更多
文摘Montmorillonite (MMT) was modified through intercalative polymerization of phenol and formaldehyde catalyzed by oxalic acid. The modified montmorillonite was delaminated at large, as demonstrated by XRD and TEM studies. It can disperse easily in epoxy resin to form exfoliated nanocomposites. The nanoscale silicate platelets dispersed in water can be metallized by silver deposition.
文摘以自制苯酚-亚联苯型酚醛树脂、环氧氯丙烷为主要原料,采用固体碱作为醚化阶段催化剂,合成了一种苯酚-亚联苯型环氧树脂。借助红外光谱(FTIR)、核磁共振光谱(1 H NMR和13C NMR)、凝胶渗透色谱(GPC)分别对产物的结构、组成和分子量进行了表征,结果成功制备了苯酚-亚联苯型环氧树脂,相对分子质量为870,环氧当量为274g/eq。此外,将所得苯酚-亚联苯型环氧树脂用于环氧模塑料中,并与市售环氧树脂所得的模塑料进行比较,借助热失重分析仪(TGA)、热机械分析仪(TMA)等对模塑料的主要性能进行研究,结果表明含有苯酚-亚联苯型环氧树脂的模塑料具有较长的凝胶时间和流动长度,具有较高的Tg(142℃)以及较高的初始降解温度(413℃),完全可以满足无铅焊料的加工工艺要求,并具有较好的弯曲强度和弯曲模量。
基金financially supported by the Key Project of the National Natural Science Foundation of China (No.50933005)
文摘The synergistic effect of phosphorus oxynitride（PON） with a novolac-based char former modified by salification （NA-metal salt） on the flame retardance of polyamide 6（PA6） was investigated.For this purpose,various flame-retardant PA6 systems were melt-compounded with PON,PON/NA,PON/NA-V_2O_5 and PON/NA-Fe_2O_3,and their flame retardance was evaluated by measuring the limiting oxygen index（LOI） values and UL-94 vertical burning ratings.The results showed that,compared with the PA6/PON/NA system,the combination of two char formers（NA-V_2O_5,NA-Fe_2O_3） with PON could obviously improve the char formation and flame retardance of PA6.The flame retardance and cone calorimetric analyses showed the stronger synergism as well as the better flame retardant performance of PON/NA-Fe_2O_3 flame retardant system. The effects of different char formers on the flame retardance and thermal stability of this system were also discussed.
