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
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
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DOI：
10.1021/acsapm.1c00742
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发表时间：
2021-08
影响因子：
5
通讯作者：
Y. Yue;X. Sha;Fushan Wang;Yan Gao;Liangliang Zhang;Yuguo Zhu;Xinxin Wang;Jiachun Feng
中科院分区：
文献类型：
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作者：
Y. Yue;X. Sha;Fushan Wang;Yan Gao;Liangliang Zhang;Yuguo Zhu;Xinxin Wang;Jiachun Feng
连续自成核退火（SSA）是一种方便而通用的热分级技术，已被广泛用于表征半结晶聚合物的链微结构。在实际应用中，含有各种添加剂的商业产品经常通过SSA进行测试，以分析树脂结构。在这种情况下，添加剂的存在是否影响基体树脂的SSA结果是值得考虑的。在同一种无规共聚聚丙烯（PPR）基体树脂中，有目的地添加了两种成核剂（β-NA和α-NA）、一种润滑剂和一种酸清除剂，并对添加和不添加这四种添加剂的PPR的SSA分级结果进行了对比研究。结果表明，不同添加剂的PPR与原始PPR的SSA结果不同。“标准”晶体熔化过程的小角X射线散射监测结果证明，添加剂改变了聚合物中有序结构在加热时的热稳定性。正是热稳定性的变化导致了由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同一基体树脂的SSA结果的关键原因。本工作提醒，在实际应用SSA来表征含有添加剂的样品的树脂基体的链微观结构，添加剂的影响不能忽视。
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.