Poly(urea-formaldehyde) (PUF) microcapsules filled with dicyclopentadiene (DCPD) were prepared by in situ polymerisation and the effect of synthesis parameters, such as pH of the solution and agitation rate, on microcapsules size and shell thickness was evaluated. Scanning electron microscopy (SEM) and Fourier transform infra-red spectroscopy (FTIR) were performed. Adjusted pH conditions (pH = 3.5) and agitation rate (1350 RPM) were found using a design of experiments (DOE). SEM results indicated that microcapsule size was directly affected by agitation rate, whereas shell thickness was mostly affected by pH. After obtaining adjusted synthesis conditions, microcapsules presenting mean size of 60 µm and mean shell thickness of 4 µm were embedded in an epoxy matrix for evaluating the self-healing effect. FTIR and SEM analyses in damaged samples suggested that a healing agent was delivered to the crack location.

通过原位制备填充有二环戊二烯（DCPD）的聚（脲-甲醛）（PUF）微胶囊评估了聚合反应和合成参数（例如溶液的pH值和搅拌速率）对微囊尺寸和壳厚度的影响。进行了扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）。使用实验设计（DOE）可以找到调整后的pH条件（pH = 3.5）和搅拌速度（1350 RPM）。SEM结果表明，微胶囊的大小直接受搅拌速率的影响，而壳的厚度主要受pH的影响。在获得调整后的合成条件后，将平均粒径为60 µm，平均壳厚度为4 µm的微囊包埋在环氧基质中，以评估其自我修复效果。受损样品的FTIR和SEM分析表明，已将修复剂输送到裂纹位置。