PDF(Pubmed)
Abstract：
In this work, a novel α-nucleating agent (NA) for polypropylene (PP) termed APAl-3C-12Li was prepared and evaluated compared with the commercially available type NA-21. For the synthesis of the organophosphate-type NA (APAl-3C), the -OH group of the acid part of NA-21 was substituted by the isopropoxy group. The structure of APAl-3C was analyzed by spectroscopy and element analysis, the results of which were consistent with the theoretical molecular formula. APAl-3C\'s thermal stability was studied by differential scanning calorimetry (DSC) and thermogravimetry (TG), which showed only weak mass loss below 230 °C, meaning that it would not decompose during the processing of PP. The APAl-3C-12Li was used as a novel nucleating agent, studying its effects on crystallization, microstructure, mechanical and optical properties. Tests were performed in a PP random copolymer at different contents, in comparison to the commercial NA-21. The composite with 0.5 wt% APAl-3C-12Li has a similar crystallization temperature of 118.8 °C as with the addition of 0.5 wt% NA-21. An advantage is that the composite with the APAl-3C-12Li has a lower haze value of 9.3% than the counterpart with NA-21. This is due to the weaker polarity of APAl-3C-12Li after the introduction of methyl and better uniform dispersion in the PP matrix, resulting in stronger improvement of optical and mechanical properties.
摘要：
在这项工作中,制备了一种称为APAl-3C-12Li的用于聚丙烯（PP）的新型α-成核剂（NA），并与市售NA-21型进行了比较。对于有机磷酸酯型NA（APAl-3C）的合成，NA-21的酸部分的-OH基团被异丙氧基取代。通过光谱学和元素分析对APAl-3C的结构进行了分析,结果与理论分子式一致。通过差示扫描量热法（DSC）和热重分析法（TG）研究了APAl-3C的热稳定性，在230°C以下仅显示微弱的质量损失，这意味着它在PP的加工过程中不会分解。APAl-3C-12Li用作新型成核剂,研究它对结晶的影响，微观结构，机械和光学性能。在不同含量的PP无规共聚物中进行了测试，与商业NA-21相比。具有0.5wt%APAl-3C-12Li的复合材料具有与添加0.5wt%NA-21的118.8°C相似的结晶温度。优点是具有APAl-3C-12Li的复合材料具有比具有NA-21的对应物低的9.3%的雾度值。这是由于引入甲基后APAl-3C-12Li的极性较弱，并且在PP基体中的分散性更好，导致光学和机械性能的更强的改善。
