摘要
以三聚氯氰交联月桂醇、8-羟基喹啉和聚乙二醇制备高分子配体CHA(PEG),再与稀土 Sm3+中心离子配位合成了一种新型高分子转光剂Sm[CHA(PEG)].采用FTIR、XPS、XRD、荧光光谱、UV和TGA等测试方法分析了 Sm[CHA(PEG)]的化学结构、荧光性能以及热稳定性等.结果表明,Sm[CHA(PEG)]在320～400 nm具有紫外宽吸收带,而荧光激发峰的最佳峰位在362 nm处,二者具有良好的吻合性;荧光发射峰在566 nm、614 nm和645 nm均出现了 Sm3+的特征发射峰,其中在645 nm处强度最大,与植物在红光区光合作用的吸收光谱具有较佳的匹配性.热失重曲线显示该转光剂的分解温度为281 ℃,热稳定性良好.本文合成的Sm[CHA(PEG)]具有优良的光学和热学性能,在农膜领域极具应用前景.
Abstract
A novel Sm[CHA(PEG)]polymer light conversion agent was synthesized by pre-paring the polymer ligand CHA(PEG)with cyanuric chloride crosslinked polyethylene gly-col,8-hydroxyquinoline,and lauryl alcohol,and carrying out coordination reaction with Sm3+.FTIR,XPS,XRD,fluorescence spectroscopy,UV,TGA,and other testing methods were used to analyze the chemical structure,fluorescence properties,and thermal stability of Sm[CHA(PEG)].The results show that the UV absorption of Sm[CHA(PEG)]polymer light conversion agent showed broadband absorption at 320～400 nm,and the optimum peak of its fluorescence excitation peak is located at 362 nm,which is in agreement;the positions of fluorescence emission peaks is at 566 nm,614 nm,and 645 nm,among which the emission peak at 645 nm has the highest intensity,which is suitable for the absorption spectra of pho-tosynthesis of plants in the red-light region.The intensity of the emission peak at 645 nm is the highest,which matches the absorption spectrum of photosynthesis in the red light region.The heat loss curve shows that the decomposition temperature of the light conversion agent is 281 ℃,and the thermal stability is good.In summary,the synthesized Sm[CHA(PEG)]polymer light conversion agent has excellent optical and thermal properties,and it has great application prospect in the field of agricultural film.
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