The synthesis of a novel self-colored polyurethane (PU) is described using 4-amino-N-propanoic acid-1,8-naphthalimide dye. To synthesize the self- colored PU, the dye was added to the PU prepolymer at the chain extension step. PU and self-colored PU were characterized by using Fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy and Fluorometry. The thermal behavior of the PU and self-colored PU were investigated by differential scanning calorimetry (DSC). The spectra indicated that the addition of dye to the polymer chain did not affect the glass transition temperature (T_g = -39 °C). Tensile strengths and Young’s modulus of the samples were assessed using a tensile strength test; they revealed that addition of the dye to the polymer structure enhanced the Young’s modulus and increased the mechanical strength of the PU. X-ray diffraction (XRD) was used for evaluation of the crystal phase of the polymer; it revealed that both components were amorphous.

使用4-氨基-N-丙酸-1,8-萘二甲酰亚胺染料描述了新型自着色聚氨酯（PU）的合成。为了合成自着色的PU，在扩链步骤将染料加入到PU预聚物中。通过使用傅立叶变换红外光谱（FTIR），紫外可见光谱和荧光法对聚氨酯和自着色聚氨酯进行了表征。通过差示扫描量热法（DSC）研究了PU和自着色PU的热行为。光谱表明，向聚合物链中添加染料不会影响玻璃化转变温度（T _g = -39°C）。使用拉伸强度测试评估样品的拉伸强度和杨氏模量。他们发现，将染料添加到聚合物结构中可以提高杨氏模量，并提高聚氨酯的机械强度。X射线衍射（XRD）用于评估聚合物的晶相；结果表明这两种成分都是非晶态的。