三菱化工集团&Wevolver：2024年从制造到回收：热塑性工程材料全生命周期综合指南（英文版）

properties of thermoplastics is heat deflection temperature or HDT. This parameter is a measure of the effect of temperature on the resistance to distortion of the thermoplastic under load. In other words, if a thermoplastic material has a high HDT, it is more likely to preserve its shape and mechanical properties even at high temperatures. Crystallinity Thermoplastics are classified as either semi-crystalline or amorphous. Put simply, crystallinity is a measure of the degree of order in the