文献类型：期刊文献

英文题名：Measuring the Microphase Separation Scale of Polyurethanes with a Vibration-Induced Emission-Based Ratiometric "Fluorescent Ruler"

作者：Zhang, Yiyao[1,2];Li, Yiru[1,2];Wang, Huan[1,2];Zhang, Zhiyun[1,2];Feng, Yanli[5];Tian, Qiang[4];Li, Na[3];Mei, Ju[1,2];Su, Jianhua[1,2];Tian, He[1,2]

机构：[1]East China Univ Sci Technol, Inst Fine Chem, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci Technol, Inst Fine Chem, Sch Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Zhangjiang Lab, Natl Facil Prot Sci Shanghai, 333 Haike Rd, Shanghai 201204, Peoples R China;[4]Southwest Univ Sci & Technol, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Sichuan, Peoples R China;[5]Dow Chem, Polyurethane Lab, 936 Zhangheng Rd, Shanghai 201203, Peoples R China

年份：2019

卷号：11

期号：42

起止页码：39351

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20194207543613);WOS:【SCI-EXPANDED(收录号:WOS:000492802100105)】；

基金：We are grateful for the financial support from the NSFC/China (21788102, 21875064, 21604023, 21790361, 21421004), Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), the International Cooperation Program of Shanghai Science and Technology Committee (17520750100), Programme of Introducing Talents of Discipline to Universities (B16017), the Shanghai Sailing Program (16YF1402200), and the Fundamental Research Funds for the Central Universities (222201717003, 222201714011). We thank the staff of BL19U2 beamline at National Center for Protein Sciences Shanghai and Shanghai Synchrotron Radiation Facility (Shanghai, People's Republic of China) for assistance during data collection.

语种：英文

外文关键词：polyurethane; microphase separation; vibration-induced emission (VIE); ratiometric; fluorescent ruler

摘要：Polyurethanes (PUs) are a very attractive type of segmented polymer with unique mechanical properties derived from thermodynamic incompatibility between flexible soft segments and hard segments. The performance of PUs is closely related to their microphase separation structures, in which the hard domains serve as physical cross-linking points in the soft matrix. Studying the microphase separation of PUs in a facile manner is thus of great significance but challenging due to the complexity of the internal structures of PUs. N,N'-disubstituted-dihydrophenazine (DPAC) derivatives, the typical molecules featured with vibration-induced emission (VIE) attribute, can emit fluorescence varying with surrounding environment. In this proof-of-concept work, a series of DPAC derivatives were employed as built-in ratiometric "fluorescent rulers" to measure the degree of microphase separation in PUs modulated by temperature variation. The fluorescence of selected DPAC-doped PU films is dependent on the temperature, providing a theoretical basis for this concept. The feasibility of these fluorescent rulers was further validated by the small-angle X-ray scattering (SAXS) analysis. The SAXS curves show significant change in q range of 0.02 to 0.15 angstrom(-1) with the variation in temperature, showing the changes in the internal microstructure. The polydisperse hard sphere model analysis of the scattering data revealed that the volume fraction of hard spheres has a defined relationship with the fluorescence intensity ratio of orange-red light and blue light, thereby demonstrating a novel fluorimetry method for measuring and monitoring the microphase separation of polyurethanes.