Why does the glue mixed with dichloromethane and polycarbonate have bubbles after curing?

The glue is not evenly mixed. Dichloromethane has the advantages of strong solubility and low toxicity, and is widely used to make safety films. When polycarbonate and dichloromethane are used to prepare glue, bubbles will appear after use, which is caused by uneven glue preparation. Polycarbonate is a polymer with carbonate groups in its molecular chain.