PVC is a white powder with an amorphous structure, low branching degree, and a relative density of about 1.4. Its glass transition temperature is 77-90°C, and it starts to decompose at around 170°C [1]. It has poor stability to light and heat; above 100°C or after prolonged exposure to sunlight, it decomposes to produce HCl, which further catalyzes its auto-decomposition, causing discoloration and a rapid decline in physical and mechanical properties. In practical applications, stabilizers must be added to enhance its stability to heat and light.