Preparation and photochromic properties of NiAl-NO3- LDHs/LDPE composite |
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作者姓名: | CHO Kyuhaeng LIN YanJun David G. EVANS LI DianQing |
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作者单位: | State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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基金项目: | Supported by the National Basic Research Program of China (973 program) (Grant No. 2004CB720602), the National Natural Science Foundation of China (Grant No. 20471006), and the Key Project of the National Natural Science Foundation of China (Grant No. 90306012) |
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摘 要: | Nanoscale NiAl-NO3-LDHs with good crystallinity have been synthesized by a method, Separate Nucleation and Aging Steps (SNAS). An NiAl-NO3-LDHs/LDPE composite was prepared by blending NiAl-NO3-LDHs and LDPE in a heated double-roller mixer. The color of this composite changed from olive green to steel gray under UV irradiation. After heating at 80oC for 2 h, the color returned to olive green. The effect of varying the amount of added NiAl-NO3-LDHs and UV exposure time on the photochromic properties of the composite has been investigated. The results showed that the photochromic phenomenon becomes more apparent with increasing amount of NiAl-NO3-LDHs. When the amount reaches 5%, the composite exhibits good photochromic properties and reproducibility. The color change rate of the composite reaches a maximum when the irradiation time exceeds 20 min. The addition of LDPE improves the photochromic cyclability of NiAl-NO3-LDHs significantly. The addition of nanoscale NiAl-NO3-LDHs also improves the mechanical properties of LDPE to some extent.
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关 键 词: | NiAl-NO3-LDHs 低密度聚乙烯 纳米级复合物 合成 对光反应变色 结晶度 |
收稿时间: | 21 September 2006 |
修稿时间: | 2006-09-212006-11-21 |
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