摘要
采用"一步法",以异佛尔酮二异氰酸酯(IPDI)、聚己二酸新戊二醇酯(PNGA)、二羟甲基丙酸(DMPA)为原料,用荧光剂7-氨基-4-三氟甲基香豆素(AFC)对预聚体进行封端,在IPDI、PNGA、DMPA、AFC摩尔比为1∶0.45∶0.30∶0.15条件下,制备出一种具有长期贮存稳定性的新型荧光型水性聚氨酯乳液(WPU-AFC)。其结构通过FTIR和UV证实;同时系统地讨论了空间位阻,温度以及AFC含量等因素对乳液荧光性能的影响。结果表明,制备的WPU-AFC的荧光强度主要受"结构荧光猝灭"影响而不是"浓度荧光猝灭"影响;随着温度的升高,WPU-AFC和AFC的荧光强度均降低;相同条件下,WPU-AFC的荧光强度与AFC相比均有明显增强;此外,随着AFC分子中苯并吡喃环刚性结构在聚氨酯主链的引入,胶膜的热稳定性明显提高。
The one-pot synthesis of the WPU-AFC fluorescent emulsion,very stable for long-term storage, was realized,based on IPDI,PNGA and DMPA,with blocking by fluorescent agent 7-amino-4-（trifluoromethyl）coumarin （AFC）. The mole ratio of IPDI∶PNGA∶DMPA∶AFC is 1∶0.45∶ 0.30∶0.15. Thestructure of WPU-AFC was confirmed by Fourier transform infrared spectroscopy （FTIR） and UV-visible absorption spectroscopy. The influence of stereohindrance,temperature and AFC content was thoroughly investigated. It was found that the fluorescence intensity of AFC was not originated from the so-called “concentrational self-quenching effect”,which could result from the “structural self-quenching effect”. The fluorescence intensity of WPU-AFC decreased with the increasing temperature,and was enhanced compared with that of AFC.In addition,the improved thermal stability of WPU-AFC was attributed to the incorporation of benzopyrone units in the preformed urethane groups.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2015年第11期4001-4005,4013,共6页
Chemical Industry and Engineering Progress
基金
陕西科技大学创新科研团队(TD12-04)
陕西科技大学研究生创新基金项目
关键词
水性聚氨酯
7-氨基-4三氟甲基香豆素
荧光强度
waterborne polyurethane
7-amino-4-（trifluoromethyl）coumarin
fluorescence intensity
