Why does styrofoam turn yellow?

Why does styrofoam turn yellow About polyurethaneFoam glueyellowing The reasons are from the perspective of technology and marketangleAnalysis, the key points are as follows reasons, PleaseFor reference: 1. The resin of ordinary polyurethane foam is exposed to UV raysIlluminationDown It is easy to produce yellowing chromogenic groups, causing the foam rubber to turn yellow and…