When natural rubber is rapidly loaded and unloaded there occurs a variation of its temperature called the elastocaloric effect. The objective of this work was to determine whether this temperature variation could be responsible for a delay in strain-induced crystallization (SIC) kinetics and stress relaxation. To this end, the SIC kinetics of cross-linked natural rubber samples with different thicknesses was studied at constant elongation after adiabatic stretching using thermal, mechanical and in-situ WAXS characterizations. The coupling of these techniques revealed that, at a fixed elongation λ (between 5 and 6), the crystallization kinetics and stress relaxation were faster in the thinner sample (with a short heat exchange time constant), thus providing evidence that heat transfer affected the SIC kinetics and should be considered when interpreting experimental results.

当天然橡胶快速加载和卸载时，其温度会发生变化，称为弹性热效应。这项工作的目的是确定这种温度变化是否会导致应变诱导结晶 (SIC) 动力学和应力松弛的延迟。为此，采用热、机械和原位绝热拉伸后，研究了不同厚度交联天然橡胶样品在恒定伸长率下的 SIC 动力学。WAXS 表征。这些技术的结合表明，在固定的伸长率 λ（介于 5 和 6 之间）下，较薄的样品（具有较短的热交换时间常数）的结晶动力学和应力松弛更快，因此提供了传热影响SIC 动力学，在解释实验结果时应予以考虑。