Design of experiments was adopted to evaluate the effect of selected test parameters on the viscoelastic behaviors of polyester tire cords through dynamic mechanical analysis systematically. Design of experiments results showed that temperature, static load, and dynamic amplitude had significant effects on the responses of complex modulus (E*) and Tan δ. Furthermore, temperature had significant interactions with static load and dynamic amplitude factors on the responses. None of the test parameters had any significant effect on the response of glass transition temperature (Tg). Below Tg, thermoplastic tire cords exhibited a high and constant dynamic modulus, whereas, beyond this point, the modulus decreased dramatically. The thermosetting tire cords exhibited a constant performance due to an ordered and tight molecular chain arrangement. The magnitude of Tan δ reached its peak value at Tg due to the increase in internal friction as a result of increasing temperature. The dynamic modulus increased and Tan δ decreased with the increasing static load as a result of restricting the mobility of chain segments. The reverse was true when the dynamic amplitude increased, most probably because of higher chain segment mobility and early stage of polymer chain slippage. Activation energy (Ea), derived from Arrhenius equation, can be used to predict its long-term performance. Tg shifted to a higher temperature as the frequency increased. In addition, by increasing the twist level of the polyester tire cord, the dynamic modulus decreased and Tan δ increased. Tg was evaluated as the upper limit working temperature, Tan δ was related to energy dissipation, and E* determined the overall performance of the tire cord. By displacing Tg to a higher temperature, reducing the magnitude of Tan δ and increasing the dynamic modulus are of great importance to a tire cord’s performance.

中文翻译：

---

使用动态力学分析研究轮胎帘线的粘弹性行为

采用实验设计，通过动态力学分析系统地评估所选测试参数对聚酯轮胎帘子线粘弹性行为的影响。实验设计结果表明，温度、静载荷和动态振幅对复数模量 (E*) 和 Tan δ 的响应有显着影响。此外，温度与响应中的静态载荷和动态振幅因素有显着的相互作用。没有一个测试参数对玻璃化转变温度 (Tg) 的响应有任何显着影响。低于 Tg，热塑性轮胎帘线表现出高且恒定的动态模量，而超过这一点，模量急剧下降。由于有序且紧密的分子链排列，热固性轮胎帘子线表现出恒定的性能。由于温度升高导致内摩擦增加，Tan δ 的大小在 Tg 处达到峰值。由于限制了链段的活动性，动态模量随着静态载荷的增加而增加，Tan δ减小。当动态振幅增加时，情况正好相反，这很可能是因为更高的链段迁移率和聚合物链滑移的早期阶段。由阿伦尼乌斯方程导出的活化能 (Ea) 可用于预测其长期性能。随着频率的增加，Tg 转移到更高的温度。此外，通过增加聚酯轮胎帘线的捻度，动态模量降低，Tan δ 增加。Tg 被评价为上限工作温度，Tan δ 与能量耗散有关，E* 决定了轮胎帘子线的整体性能。通过将 Tg 移至更高的温度，降低 Tan δ 的大小和增加动态模量对轮胎帘线的性能非常重要。