Isothermal crystallization process of poly(4-methyl-1-pentene)/alkylated graphene oxide nanocomposites: thermal analysis and rheology study
Isothermal crystallization process of poly(4-methyl-1-pentene)/alkylated graphene oxide nanocomposites: thermal analysis and rheology study
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DOI：
10.1039/c5ra12254f
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发表时间：
2015-09
期刊：
影响因子：
3.9
通讯作者：
Li-yang Xu;B. Yin;Huai-wen Yan;Ai-ping Ma;Ming‐bo Yang
中科院分区：
文献类型：
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作者：
Li-yang Xu;B. Yin;Huai-wen Yan;Ai-ping Ma;Ming‐bo Yang
本研究通过静电自组装的方法成功地制备了烷基化氧化石墨烯（GO-ODA）。然后，从溶液中获得TPX/GO-ODA纳米复合材料。所有样品具有相同的晶体结构，如通过X射线衍射（XRD）发现的I型。可以注意到，聚（4-甲基-1-戊烯）（TPX）在高结晶温度下具有两种类型的层状结构，如通过差示扫描量热法（DSC）发现的。结晶温度越高，结晶速度越慢;然而，纳米填料GO-ODA具有加速结晶的巨大优势。同时，GO-ODA作为成核剂的加入提高了II型层状陶瓷的外观温度。此外，晶体生长的空间受到GO-ODA结构的限制。在流变实验中，当频率高于某一临界值时，结晶不再受频率的影响。在这项研究中，探索结晶行为和结晶流变学之间的相互作用可以指导实际应用和加工中聚合物的选择。
In this study, alkylated graphene oxide (GO–ODA) was obtained successfully via electrostatic self-assembling of oppositely charged GO and ODA. Then, TPX/GO–ODA nanocomposites were obtained from the solution. All samples have the same crystal structure, Form I, as found by X-ray diffraction (XRD). It can be noted that poly(4-methyl-1-pentene) (TPX) has two types of lamellae at high crystallization temperatures, as found by differential scanning calorimetry (DSC). The higher the crystallization temperature, the slower crystallization occurs; however, the nanofiller GO–ODA has the great advantage of accelerating crystallization. At the same time, the added GO–ODA, as a nucleating agent, improves the appearance temperature of the Type II lamellae. Moreover, space for crystal growth is limited by the structure of GO–ODA. In rheological experiments, when the frequency was higher than a critical value, crystallization was no longer affected by the frequency. In this study, exploring such interplay between the crystallization behavior and rheology of crystallization could guide the choice of polymers in practical applications and processing.