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热固性树脂的最高允许使用温度及其在受热条件下的力学性能主要取决于树脂在受热和外力作用下开始出现明显变形(软化)的温度以及最大形变值。热塑性树脂在外力作用下的形变一般包括普弹形变、高弹形变和粘流形变三个部分。由于热固性树脂的大分子间不能发生相对滑移,因此粘流形变并不存在,而只存在普弹及高弹二种形变。普弹形变由原子键角及
The maximum permissible operating temperature of thermosetting resins and their mechanical properties under heat are primarily dependent on the temperature at which the resin begins to deform (soften) significantly under the influence of heat and external forces, as well as the maximum deformation value. The deformation of thermoplastic resin under external force generally includes general elastic deformation, high elastic deformation and viscous flow deformation of three parts. Due to the relative slip between the macromolecules of the thermosetting resin, viscous flow deformation does not exist, but only two kinds of deformations, general bullet and high elasticity. Pu deformation by the atomic bond angle and