Yanhua PANG
,
Wei FENG
,
Jie CHEN
,
Yan LIU
,
Weimin CAI
材料科学技术（英文）
A series of inorganic-organic thin films based on uniformly dispersed nanoparticles of polyoxometalates (POM) entrapped in polyacrylamide (PAM) matrix were prepared by ultrasonic method with different irradiation time. The microstructure, photochromic behavior and mechanism of the films were studied by transmission electron microscopy (TEM), ultraviolet-visible spectra (UV-VIS) and Fourier transform-infrared spectroscopy (FT-IR). The microstructure and photochromic properties of the hybrid thin films could be controlled by ultrasound. TEM image revealed that the average size of phosphotungstic acid (PWA) nanoparticles decreased from 20 to 10 nm with the ultrasound irradiation time from 30 to 60 min. After irradiated with ultraviolet light, the transparent films changed from colorless to blue and showed reversible photochromism. The hybrid film, with ultrasound irradiation for 60 min had higher photochromic efficiency and faster bleaching reaction than the one with ultrasound irradiation for 30 min. FT-IR spectra showed that the Keggin geometry of heteropolyoxometalate was still preserved inside the composites, and the interactions between polyanions and polymer matrix increased as the ultrasound time prolonged. It is suggested that the mechanism of the different photochromic properties for the inorganic-organic thin films is the variation of the microstructure and interfacial interactions induced by ultrasound.
关键词:
sonochemical
,
null
,
null
,
null
关兴华
,
王志鹏
,
崔善子
,
王红华
,
周光远
高分子材料科学与工程
酚酞(PPH)、3,3'-双(4-羟基苯基)苯并吡咯酮(HPP)和4,4'-二氟二苯酮经亲核缩聚得到聚芳醚酮(PEK-C-H),再经与环氧氯丙烷(ECH)的亲核取代反应合成了一种含有环氧侧基的酚酞聚芳醚酮共聚物(PEK-C-HE).通过改变反应单体ECH的量,调控聚合物的环氧侧基含量.采用红外光谱(FT-IR)、核磁共振(1H-NMR)和差示扫描量热(DSC)等手段对聚合物进行结构表征与性能测试.以PEK-C-HE在极性非质子溶剂中具有良好的溶解性及成膜性制备了溶液涂层,并考察了涂膜经自固化交联后的性能.结果表明,PEK-C-HE涂层具有优异的综合性能,可在(300±20)℃连续30h不脱落,表面电阻均为1.05×1016Ω,冲击强度均大于100 kg·cm.PEK-C-HE有望应用于高性能涂料的制备.
关键词:
酚酞聚芳醚酮共聚物
,
功能化制备
,
环氧侧基
,
可控
,
自固化
,
高性能涂料
王红华
,
关兴华
,
王志鹏
,
周光远
,
李存峰
应用化学
doi:10.3724/SP.J.1095.2013.20575
由3,3’-双(4-羟基苯基)苯并吡咯酮(H PP)和4,4’-二氟二苯酮经亲核缩聚合成聚芳醚酮(PEK-H),再经与环氧氯丙烷(ECH)的亲核取代反应,制得了一种含量可控的环氧侧基酚酞聚芳醚酮(PEK-HE).改变ECH的投料量,可调控环氧侧基在聚合物中的含量.采用FHR、1H NMR和TGA等技术对聚合物进行了结构表征与性能测试,并考察了经自固化后聚合物涂膜的性能.涂膜热稳定性较固化前明显提高,5％热失重温度均在450℃以上.涂膜具有优异的热性能和机械性能:耐温(350±20)℃；冲击强度高于100 kg·cm.
关键词:
酚酞聚芳醚酮
,
功能化制备
,
环氧侧基
,
可控
,
自固化
,
高性能涂料
