Non-Negligible Effect of Additives in the Application of Successive Self-Nucleation and Annealing Fractionation for Microstructure Characterization of Matrix Resin in Additive-Containing Samples,ACS Applied Polymer Materials

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Non-Negligible Effect of Additives in the Application of Successive Self-Nucleation and Annealing Fractionation for Microstructure Characterization of Matrix Resin in Additive-Containing Samples
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-08-19 , DOI: 10.1021/acsapm.1c00742
Yang Yue ₁ , Xuan Sha ₁ , Fushan Wang ₂ , Yan Gao ₂ , Liangliang Zhang ₂ , Yuguo Zhu ₂ , Xinxin Wang ₁ , Jiachun Feng ₁

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Successive self-nucleation and annealing (SSA) is a convenient and versatile thermal fractionation technique that has been extensively used to characterize the chain microstructure of semicrystalline polymers. In practical applications, commercial products containing various additives are frequently tested by SSA to analyze the resin structure. In this case, whether the presence of additives affects the SSA result of matrix resin is worth considering. In this work, four additives including two nucleating agents (β-NA and α-NA), a lubricant, and an acid scavenger were purposefully added into the same polypropylene random copolymer (PPR) matrix resin, and SSA fractionation results of PPR with and without these additives were comparatively studied. It was found that SSA results of PPR containing diverse additives and pristine PPR are different. The results of small-angle X-ray scattering monitoring of the melting process of the “standard” crystal proved that additives altered the thermal stability of the ordered structure in the polymer upon heating. It is the variation in thermal stability that led to the change in the ideal self-nucleation temperature determined by the self-nucleation experiment, which is a crucial reason why different additives affected the SSA results of the same matrix resin. This work reminds that in the practical application of SSA to characterize the chain microstructure of the resin matrix for samples containing additives, the influence of additives cannot be ignored.

中文翻译：

添加剂在连续自成核和退火分级用于含添加剂样品中基质树脂微观结构表征的应用中的不可忽视的影响

连续自成核和退火 (SSA) 是一种方便且通用的热分馏技术，已广泛用于表征半结晶聚合物的链微观结构。在实际应用中，含有各种添加剂的商业产品经常被 SSA 测试以分析树脂结构。在这种情况下，添加剂的存在是否会影响基体树脂的SSA结果值得考虑。在这项工作中，包括两种成核剂（β-NA 和α-NA）、润滑剂和酸清除剂在内的四种添加剂被有意添加到相同的聚丙烯无规共聚物 (PPR) 基体树脂中，PPR 的 SSA 分馏结果为没有这些添加剂进行了比较研究。发现含有多种添加剂的PPR与原始PPR的SSA结果不同。“标准”晶体熔化过程的小角度 X 射线散射监测结果证明，添加剂在加热时改变了聚合物中有序结构的热稳定性。正是热稳定性的变化导致了自成核实验确定的理想自成核温度的变化，这是不同添加剂影响相同基体树脂SSA结果的关键原因。这项工作提醒在实际应用 SSA 来表征含有添加剂的样品的树脂基体的链状微观结构时，添加剂的影响不容忽视。

更新日期：2021-09-10

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