Synthesis and Characterization of Biodegradable Polyester/Polyether WPU as the Environmental Protection Coating

Polyester diol PCL and PBA, polyether PTMG polycarbonate PCDL were used as components of WPU soft segment, respectively. Polyether PTMG-WPU has the worst hydrolytic property highest thermal stability. The maximum degradation rate temperature Tmax is 407.8 °C, water contact angle reaches 89.5 °. Traditional polyester PCL-WPU shows strongest hydrolysis performance, smallest angle, only 71.7 °, absorption 72 h at room high 26.7%. However, stability lower, segment Tg −52.3 333.7 but mechanical which best, tensile strength 58.3 MPa, elongation break 857.9%. most important thing that structure more easily destroyed by lipase molecules. acidic products produced after will further promote polyester. Therefore, compared with other WPUs, best biodegradability obvious effect under same conditions. 30 days in 0.6% PBS buffer solution soil was 4.2% 2.3%, while traditional reached 41.7% 32.0%, In addition, PCDL-WPU hardness, reaching 95.5 HD. But its performances are lower than PCL-WPU.