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Preparation and photochromic properties of NiAl-NO_3-LDHs/LDPE composite

机译：NiAl-NO_3-LDHs / LDPE复合材料的制备及光致变色性能

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摘要

Nanoscale NiAl-NO_3-LDHs with good crystallinity have been synthesized by a method, Separate Nu-cleation and Aging Steps (SNAS). An NiAl-NO_3-LDHs/LDPE composite was prepared by blending NiAl-NO_3-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 80℃ for 2 h, the color returned to olive green. The effect of varying the amount of added NiAl-NO_3-LDHs and UV exposure time on the photo-chromic properties of the composite has been investigated. The results showed that the photochromic phenomenon becomes more apparent with increasing amount of NiAl-NO_3-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-NO_3-LDHs significantly. The addition of nanoscale NiAl-NO_3-LDHs also improves the mechanical properties of LDPE to some extent.
机译：通过分离成核和老化步骤（SNAS）的方法合成了具有良好结晶度的纳米级NiAl-NO_3-LDHs。通过在加热的双辊混合器中共混NiAl-NO_3-LDHs和LDPE来制备NiAl-NO_3-LDHs / LDPE复合材料。在紫外线照射下，该复合材料的颜色从橄榄绿色变为钢灰色。在80℃下加热2小时后，颜色恢复为橄榄绿色。研究了改变NiAl-NO_3-LDHs添加量和UV暴露时间对复合材料光致变色性能的影响。结果表明，随着NiAl-NO_3-LDHs含量的增加，光致变色现象更加明显。当该量达到5％时，该复合材料表现出良好的光致变色性能和再现性。当照射时间超过20分钟时，复合材料的颜色变化率达到最大。 LDPE的加入显着改善了NiAl-NO_3-LDHs的光致变色循环能力。纳米NiAl-NO_3-LDHs的加入在一定程度上也改善了LDPE的机械性能。

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