采用自由基溶液聚合法制备了不同投料摩尔比的丙烯腈（AN）-N-乙烯基咪唑（VIM）共聚物[P（AN-co-VIM）].将n（AN）∶n（VIM）为82∶18和80∶20的P（AN-co-VIM）共聚物于210-220℃熔融纺丝制备了P（AN-co-VIM）初生纤维.通过傅里叶变换...采用自由基溶液聚合法制备了不同投料摩尔比的丙烯腈（AN）-N-乙烯基咪唑（VIM）共聚物[P（AN-co-VIM）].将n（AN）∶n（VIM）为82∶18和80∶20的P（AN-co-VIM）共聚物于210-220℃熔融纺丝制备了P（AN-co-VIM）初生纤维.通过傅里叶变换红外光谱、核磁共振（1H NMR）谱、差示扫描量热分析、X射线衍射分析和热台显微镜对P（AN-co-VIM）共聚物的组成、热力学和结晶行为进行了表征.结果表明,自由基溶液聚合法可成功制备P（AN-co-VIM）共聚物,当VIM的摩尔分数大于10%时,共聚物具有可熔融加工性.随着VIM摩尔分数的增加,共聚物的熔点降低,当VIM含量为20%时,共聚物的熔点从317℃降低至180℃,其分解温度最高为313.7℃.扫描电子显微镜（SEM）和电子单纤维强力测试.结果表明,纤维的表面光滑,断面结构致密,初生纤维的断裂强度为1.58 c N/dtex,断裂伸长率为11.2%,有望广泛应用于碳纤维领域.展开更多
用X-射线光电子能谱仪(XPS)和胶体滴定法研究了聚N-乙烯基甲酰胺(PNVF)的碱性水解反应.结果表明PNVF水解产物的胺化度随着体系中碱浓度的增大而增大.在PNVF中含有约10%的非甲酰胺基团,由XPS谱图推论这些基团存在C O C结构.PNVF水解产物...用X-射线光电子能谱仪(XPS)和胶体滴定法研究了聚N-乙烯基甲酰胺(PNVF)的碱性水解反应.结果表明PNVF水解产物的胺化度随着体系中碱浓度的增大而增大.在PNVF中含有约10%的非甲酰胺基团,由XPS谱图推论这些基团存在C O C结构.PNVF水解产物的高解像度C 1s XPS谱图中,存在5种不同结合能的碳,各峰的变化与PNVF水解过程中的官能团变化规律一致.在285.5 eV处的峰为-CHNH2结构中的碳,归因于PNVF的-NHCHO水解为-NH2;胶体滴定和XPS谱图分析结果的比较表明:采用胶体滴定法测定氨基含量时,如果不考虑PNVF的纯度,将存在较大的误差.展开更多
The C60 grafted poly(N-vinyl carbazole) (PVK) polymer(CGP) was prepared by simple radical polymerization initiated by BPO at 90℃.The products were characterized by UV-Vis, FTIR, GPC and fluorescence and it was proven...The C60 grafted poly(N-vinyl carbazole) (PVK) polymer(CGP) was prepared by simple radical polymerization initiated by BPO at 90℃.The products were characterized by UV-Vis, FTIR, GPC and fluorescence and it was proven that C60 was grafted covalently to the PVK. The C60 moiety in the product was about 1. 2% (mass fraction). The photoconductlvity study revealed that the photoconductivity of PVK was improved obviously through grafting C60.The half time of light decaying (t1/2) of CGP reached 0. 35 s.展开更多
文摘采用自由基溶液聚合法制备了不同投料摩尔比的丙烯腈（AN）-N-乙烯基咪唑（VIM）共聚物[P（AN-co-VIM）].将n（AN）∶n（VIM）为82∶18和80∶20的P（AN-co-VIM）共聚物于210-220℃熔融纺丝制备了P（AN-co-VIM）初生纤维.通过傅里叶变换红外光谱、核磁共振（1H NMR）谱、差示扫描量热分析、X射线衍射分析和热台显微镜对P（AN-co-VIM）共聚物的组成、热力学和结晶行为进行了表征.结果表明,自由基溶液聚合法可成功制备P（AN-co-VIM）共聚物,当VIM的摩尔分数大于10%时,共聚物具有可熔融加工性.随着VIM摩尔分数的增加,共聚物的熔点降低,当VIM含量为20%时,共聚物的熔点从317℃降低至180℃,其分解温度最高为313.7℃.扫描电子显微镜（SEM）和电子单纤维强力测试.结果表明,纤维的表面光滑,断面结构致密,初生纤维的断裂强度为1.58 c N/dtex,断裂伸长率为11.2%,有望广泛应用于碳纤维领域.
文摘The C60 grafted poly(N-vinyl carbazole) (PVK) polymer(CGP) was prepared by simple radical polymerization initiated by BPO at 90℃.The products were characterized by UV-Vis, FTIR, GPC and fluorescence and it was proven that C60 was grafted covalently to the PVK. The C60 moiety in the product was about 1. 2% (mass fraction). The photoconductlvity study revealed that the photoconductivity of PVK was improved obviously through grafting C60.The half time of light decaying (t1/2) of CGP reached 0. 35 s.
