A new chiral poly(aryl ether ketone)(PAEK) containing 1,1′-bi-2-naphthyl moiety was synthesized. The chiral PAEK was characterized by IR, 1H NMR, GPC and DSC. The chiral behavior of the chiral PAEK was investigated b...A new chiral poly(aryl ether ketone)(PAEK) containing 1,1′-bi-2-naphthyl moiety was synthesized. The chiral PAEK was characterized by IR, 1H NMR, GPC and DSC. The chiral behavior of the chiral PAEK was investigated by vibrational circular dichroism(VCD) preliminaryly, and we found it possesses the chiral feature. It would be attempted to be chiral stationary phase to realize chiral separation.展开更多
合成了两种含联萘结构的环氧树脂2,2'-二(9-环氧基壬酰氧基)-1,1'-联萘(R1)和2,2'-二(3-环氧基丙酰氧基)-1,1'-联萘(R2)。通过1HNMR和EA对目标产物结构进行了表征。以4,4'-二氨基二苯基甲烷(DDM)为固化剂,通过Ozaw...合成了两种含联萘结构的环氧树脂2,2'-二(9-环氧基壬酰氧基)-1,1'-联萘(R1)和2,2'-二(3-环氧基丙酰氧基)-1,1'-联萘(R2)。通过1HNMR和EA对目标产物结构进行了表征。以4,4'-二氨基二苯基甲烷(DDM)为固化剂,通过Ozawa法计算出R1/DDM和R2/DDM固化体系的反应活化能(E_a)分别为56.29和56.88 k J/mol,随着固化反应转化率(α)的增加,R1/DDM的E_a不断增大,而R2/DDM的E_a略微减小。考察了不同长度碳链对固化物的热稳定性、玻璃化转变温度(T_g)、力学性能和吸水率的影响。结果表明:短碳链的R2/DDM较长碳链的R1/DDM,固化物的初始分解温度由220.3℃下降到210.5℃,800℃下残炭率由3.45%上升至6.77%,T_g由135℃上升到141℃,断裂伸长率由6.7%下降至4.3%,吸水率由0.35%降至0.28%。展开更多
Three series of poly(aryl ether ketone)s(PAEKs) were synthesized from varied ratio of 1-chloro-4-(4-chlorobenzoyl)naphthalene and 4,4′-difluorobenzophenone with three different bisphenols respectively. The polymers h...Three series of poly(aryl ether ketone)s(PAEKs) were synthesized from varied ratio of 1-chloro-4-(4-chlorobenzoyl)naphthalene and 4,4′-difluorobenzophenone with three different bisphenols respectively. The polymers have been studied by IR、DSC, mechanical property and solubility measurements. The results showed that the T_g of the polymers increased with the increase of 1,4-naphthylene and the tensile strength got a maximum at a certain naphthylene content. The PAEKs were soluble plastics with excellent heat resistance and good tensile strength.展开更多
采用固体13 C核磁共振(13 C Solid-NMR)、差示扫描量热分析(DSC)研究了不同温度场对聚丙烯腈纤维预氧过程中类萘啶结构生成的影响。研究结果表明:提高预氧化温度纤维中易于形成类萘啶的梯形含氮芳杂环结构,预氧化热处理温度高于230℃时...采用固体13 C核磁共振(13 C Solid-NMR)、差示扫描量热分析(DSC)研究了不同温度场对聚丙烯腈纤维预氧过程中类萘啶结构生成的影响。研究结果表明:提高预氧化温度纤维中易于形成类萘啶的梯形含氮芳杂环结构,预氧化热处理温度高于230℃时,类萘啶结构生成速度较快。梯度升温方式影响类萘啶结构的生成,三温区温度场条件下(210-230-245℃),在高温区(245℃)停留时间较长时有利于类萘啶结构的形成和发展;四温区温度场中(210-230-245-260℃),均匀分配各温区的热处理时间更有利于类萘啶结构的生成。展开更多
文摘A new chiral poly(aryl ether ketone)(PAEK) containing 1,1′-bi-2-naphthyl moiety was synthesized. The chiral PAEK was characterized by IR, 1H NMR, GPC and DSC. The chiral behavior of the chiral PAEK was investigated by vibrational circular dichroism(VCD) preliminaryly, and we found it possesses the chiral feature. It would be attempted to be chiral stationary phase to realize chiral separation.
文摘合成了两种含联萘结构的环氧树脂2,2'-二(9-环氧基壬酰氧基)-1,1'-联萘(R1)和2,2'-二(3-环氧基丙酰氧基)-1,1'-联萘(R2)。通过1HNMR和EA对目标产物结构进行了表征。以4,4'-二氨基二苯基甲烷(DDM)为固化剂,通过Ozawa法计算出R1/DDM和R2/DDM固化体系的反应活化能(E_a)分别为56.29和56.88 k J/mol,随着固化反应转化率(α)的增加,R1/DDM的E_a不断增大,而R2/DDM的E_a略微减小。考察了不同长度碳链对固化物的热稳定性、玻璃化转变温度(T_g)、力学性能和吸水率的影响。结果表明:短碳链的R2/DDM较长碳链的R1/DDM,固化物的初始分解温度由220.3℃下降到210.5℃,800℃下残炭率由3.45%上升至6.77%,T_g由135℃上升到141℃,断裂伸长率由6.7%下降至4.3%,吸水率由0.35%降至0.28%。
文摘Three series of poly(aryl ether ketone)s(PAEKs) were synthesized from varied ratio of 1-chloro-4-(4-chlorobenzoyl)naphthalene and 4,4′-difluorobenzophenone with three different bisphenols respectively. The polymers have been studied by IR、DSC, mechanical property and solubility measurements. The results showed that the T_g of the polymers increased with the increase of 1,4-naphthylene and the tensile strength got a maximum at a certain naphthylene content. The PAEKs were soluble plastics with excellent heat resistance and good tensile strength.
文摘采用固体13 C核磁共振(13 C Solid-NMR)、差示扫描量热分析(DSC)研究了不同温度场对聚丙烯腈纤维预氧过程中类萘啶结构生成的影响。研究结果表明:提高预氧化温度纤维中易于形成类萘啶的梯形含氮芳杂环结构,预氧化热处理温度高于230℃时,类萘啶结构生成速度较快。梯度升温方式影响类萘啶结构的生成,三温区温度场条件下(210-230-245℃),在高温区(245℃)停留时间较长时有利于类萘啶结构的形成和发展;四温区温度场中(210-230-245-260℃),均匀分配各温区的热处理时间更有利于类萘啶结构的生成。
