【摘要】 力致变色材料会对外部刺激做出响应，因此可实现材料损伤预警。苝二酰亚胺(perylene diimide, PDI)衍生物因其出色的荧光性能而受到关注。然而，由于机械力难以破坏PDI及其衍生物的聚集，以及PDI之间连续π-π堆积导致的荧光猝灭，PDI在力致变色领域的应用受限。为了避免PDI聚集引起的荧光猝灭效应，拓宽其应用领域，该文选择多面体低聚倍半硅氧烷(polyhedral oligomeric silsesquioxane, POSS)-PDI-POSS(PPP)分子作为掺杂剂。研究了在不同溶剂中PPP单分子态和聚集态的光物理性质。将PPP分子与聚苯乙烯-丁二烯-苯乙烯(styrene-butadiene-styrene block copolymer, SBS)混合制备PPP/SBS薄膜，探索了此类材料的力致变色效应。荧光发射光谱表明，当PPP质量分数增加到0.30%时，PPP/SBS薄膜在单轴拉伸变形下因分子堆积行为改变而变色。更多还原

【Abstract】 Mechanochromic materials respond to external stimuli and provide early warnings of material damage. Perylene diimide(PDI)-based materials have attracted attention because of their outstanding fluorescence performance. However, the application of PDI in mechanochromism is limited by the difficulty for mechanical forces to disrupt the aggregation of PDI and its derivatives, as well as the fluorescence quenching caused by continuous π-π stacking between PDI molecules. To eliminate the fluorescence quenching effect caused by the aggregation of PDI and broaden its application fields, polyhedral oligomeric silsesquioxane(POSS)-PDI-POSS(PPP) was screened as PDI doping. The photophysical properties of PPP in both monomeric and aggregated states in different solvents were studied. Then, PPP and styrene-butadiene-styrene block copolymer(SBS) were mixed to prepare the PPP/SBS film. The mechanochromic properties of PPP/SBS film were explored. The fluorescence emission spectra confirmed that when the PPP mass fraction increased to 0.30%, the PPP/SBS film exhibited mechanochromic behavior under uniaxial deformation due to the changes in the molecular packing.更多还原