It is shown in the present paper how the addition of a moderate amount of carbon black filler to a polychloroprene gum modifies the local strain state and alters the ability of the polymer to strain-crystallize. The study combines mechanical and X-ray diffraction performed during classical mechanical cycling and tensile impact tests. It highlights the fact that the strain modification induced by the filler addition is highly inhomogeneous: the crystallization behavior and the local draw ratio state are affected differently. The partial relaxation of the amorphous fraction by the strain-induced crystallization evidenced in the pure gum is still present and should play a protective role. The effect of temperature on the crystallization correlates with the evolution of stress-strain curves. In particular the role of crystallization in stress-hardening is apparently amplified by the presence of the filler. Preliminary tensile tests reveal a drastic decrease of the induction time necessary for crystallization to develop. This implies a strain amplification effect higher than predicted from mechanical cycling analysis. It is proposed that carbon black particles have no time to relax during the fast stretching period. All these observations point to a synergistic effect between filler addition and strain-induced crystallization.

在本文中表明，向聚氯丁二烯胶中添加适量的炭黑填料如何改变局部应变状态并改变聚合物应变结晶的能力。该研究结合了在经典机械循环和拉伸冲击试验过程中进行的机械和X射线衍射。它强调了一个事实，即由于添加填料而引起的应变变化非常不均匀：结晶行为和局部拉伸比状态受到不同的影响。在纯胶中，无定形部分因应变诱导的结晶而部分松弛，这种现象仍然存在，并应起保护作用。温度对结晶的影响与应力-应变曲线的演变有关。特别地，由于填料的存在，结晶在应力硬化中的作用显然得到了增强。初步的拉伸试验表明，结晶形成所需的诱导时间大大减少。这意味着应变放大效果高于机械循环分析所预测的效果。提出了炭黑颗粒在快速拉伸期间没有时间松弛。所有这些观察结果都表明填料添加与应变诱导结晶之间具有协同作用。提出炭黑颗粒在快速拉伸期间没有时间松弛。所有这些观察结果都表明填料添加与应变诱导结晶之间具有协同作用。提出炭黑颗粒在快速拉伸期间没有时间松弛。所有这些观察结果都表明填料添加与应变诱导结晶之间具有协同作用。