We demonstrated a mechanochromic chameleon packaging that quantitatively visualizes damage based on the polydiacetylene blue-to-red color transition. The applied pressures on the damage can be conveniently read by taking a photograph via a homemade mobile app called the “Pressure Analysis App”. The key aspects of the development were 1) the adjustment of the sensitivity by adding guest molecules into the PDA matrix, 2) quantitative calibration, and 3) the accurate reading of the pressure from RGB images based on the calibration. The force sensitivity of polydiacetylene on cellulose was characterized in the range of 30–100 nN (2.59–8.86 MPa) at the nanoscale by dual friction force/fluorescence microscopy, and in the range of 0.7–2.2 N (0.11–0.35 MPa) at the macroscopic scale by a friction tester. The scanning speed was found to be one of the key parameters, where the force sensitivity above 50 mm/s was 6.45 times larger than that below 10 mm/s. The developed mechanochromic packaging system can be used for transporting electronics and medical tools, such as vaccine vials, food, etc., more safely and reliably in the future.

中文翻译：

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基于聚二乙炔的机械变色变色龙包装


我们展示了一种机械变色变色龙包装，它基于聚二乙炔从蓝色到红色的过渡定量可视化损伤。通过名为“Pressure Analysis App”的自制移动应用程序拍照，可以方便地读取对损伤施加的压力。开发的关键方面是 1） 通过在 PDA 矩阵中添加客体分子来调整灵敏度，2） 定量校准，以及 3） 根据校准从 RGB 图像中准确读取压力。通过双摩擦力/荧光显微镜在纳米尺度上表征聚二乙炔对纤维素的力敏感性在 30-100 nN （2.59-8.86 MPa） 范围内，在宏观尺度上通过 摩擦测试仪在 0.7-2.2 N （0.11-0.35 MPa） 范围内表征。扫描速度是关键参数之一，其中 50 mm/s 以上的力灵敏度是 10 mm/s 以下的力灵敏度的 6.45 倍。开发的机械变色包装系统可用于未来更安全、更可靠地运输电子产品和医疗工具，例如疫苗瓶、食品等。