Abstract The crystallization kinetics of commercial high cis-1.4-polybutadiene (BR) is measured by conventional differential scanning calorimetry (DSC) and fast differential scanning calorimetry (FDSC). This rubber has a glass transition temperature below -100 °C and is technically used for a wide application range. In a crystallinity range between 10 % and 30 % the ratio between the crystal and rigid amorphous fraction was determined to be about unity. Using the FDSC allows the quantitative characterization of the crystallization half time in the temperature range between the glass transition and the melting point even at low temperatures. For this, a discrete measurement method was applied. A single crystallization process was determined with the maximum crystallization rate at -50 °C. For crystallization below -40 °C, the measurements show that the melting temperature of the initially formed crystals is relatively low. The Avrami exponent is about unity. We observed comparable kinetics of nucleation and growth. A relatively large amount of an amorphous fraction with restricted mobility (the rigid amorphous fraction) is formed during crystallization at low temperatures. This finding leads to the model of self-assembled confinements for the low temperature BR crystallization.

中文翻译：

---

顺式1.4-聚丁二烯低温等温结晶

摘要 商用高顺式 1.4-聚丁二烯 (BR) 的结晶动力学通过常规差示扫描量热法 (DSC) 和快速差示扫描量热法 (FDSC) 进行测量。这种橡胶的玻璃化转变温度低于 -100 °C，在技术上用于广泛的应用范围。在 10% 和 30% 之间的结晶度范围内，晶体和刚性无定形部分之间的比率被确定为大约一致。即使在低温下，使用 FDSC 也可以在玻璃化转变温度和熔点之间的温度范围内对结晶半衰期进行定量表征。为此，应用了离散测量方法。单结晶过程在-50°C 时具有最大结晶速率。对于低于 -40 °C 的结晶，测量结果表明，最初形成的晶体的熔化温度相对较低。Avrami 指数是关于统一的。我们观察到成核和生长的类似动力学。在低温结晶过程中会形成相对大量的流动性受限的无定形部分（刚性无定形部分）。这一发现导致了低温 BR 结晶的自组装限制模型。