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Abstract：
This study investigates the influence of poly(butadiene-isoprene) copolymer rubber (BIR) and TDAE oil on the crystallization and melting behavior of neodymium-based butadiene rubber (Nd-BR). The study demonstrates that the melting points of Nd-BR and its blends decrease with lower crystallization temperatures. Below the critical crystallization temperature (Tc,c), the melting behavior shows dual peaks in distinct temperature ranges, which are attributed to different spherulitic sizes. The addition of BIR or TDAE oil lowers the Tc,c, with TDAE oil exerting a more substantial effect. These diluents mainly influence the nucleation temperature and crystallinity level of Nd-BR while having a minimal effect on the crystallization mechanism. A master curve, which overlaps for various samples, is developed by correlating the peak melting temperature (Tm,peak) with the Tc. This curve facilitates a quantitative assessment of the effects of BIR and TDAE oil on Nd-BR, highlighting the greater influence of TDAE oil on the crystalline structure compared with BIR at equivalent mass fractions. By applying the Lorentz equation and multi-peak fitting, a relationship between the melting points and crystallization temperatures is established, enabling the calculation of the equilibrium melting points (Tm0) for different samples. The findings show a reduction in the Tm0 due to the diluents; specifically, the Tm0 is approximately 0 °C for pure Nd-BR, and it decreases to -4.579 °C and -6.579 °C for samples with 50 PHR TDAE oil and 60 wt.% BIR, respectively.
摘要：
本研究研究了聚（丁二烯-异戊二烯）共聚物橡胶（BIR）和TDAE油对钕基丁二烯橡胶（Nd-BR）结晶和熔融行为的影响。研究表明，Nd-BR及其共混物的熔点随结晶温度的降低而降低。低于临界结晶温度(Tc，)熔融行为在不同的温度范围内显示双峰，这归因于不同的球粒大小。添加BIR或TDAE油降低Tc，C,与TDAE油发挥更实质性的作用。这些稀释剂主要影响Nd-BR的成核温度和结晶度，而对结晶机理的影响最小。主曲线，各种样本重叠，通过关联峰值熔融温度(Tm，峰值)与Tc。该曲线有助于定量评估BIR和TDAE油对Nd-BR的影响，突出了TDAE油对结晶结构的更大的影响相比，BIR等质量分数。通过应用洛伦兹方程和多峰拟合,建立了熔点和结晶温度之间的关系，能够计算不同样品的平衡熔点(Tm0)。研究结果表明，由于稀释剂，Tm0降低；特别是，纯Nd-BR的Tm0约为0°C，对于具有50PHRTDAE油和60wt.%BIR,分别。
