Unusual crystallization behavior of biodegradable poly(ethylene adipate) based nanocomposites induced by graphene oxide
Unusual crystallization behavior of biodegradable poly(ethylene adipate) based nanocomposites induced by graphene oxide
复制标题
氧化石墨烯诱导的可生物降解聚己二酸乙二醇酯纳米复合材料的异常结晶行为
DOI：
10.1039/c5ra10332k
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Qiu, Zhaobin
中科院分区：
文献类型：
--
作者：
Jiang, Zinan;Qiu, Zhaobin
在本研究中，我们成功地制备了一系列的氧化石墨烯（GO）/可生物降解的聚（己二酸乙二酯）（PEA）的纳米复合材料，通过一个简单的溶液和沉淀过程。扫描电子显微镜观察显示GO在整个PEA基质中具有层状结构的精细分散体。详细研究了PEA/GO纳米复合材料的晶体结构、非等温熔融结晶行为、整体等温熔融结晶动力学、球晶形貌和球晶生长速率，并与纯PEA进行了比较。当样品以5 °C min-1的冷却速率非等温结晶或在32 - 40 °C的结晶温度范围内等温结晶时，由GO的异相成核诱导的纳米复合材料的结晶过程得到增强;然而，纳米复合材料和纯PEA表现出相同的结晶机理和晶体结构。在24至32 °C的研究温度范围内，观察到纯PEA及其纳米复合材料的带状球晶形态。此外，有趣的是发现GO不仅作为成核剂提高了成核密度，而且通过表现出超结构模板效应增加了纳米复合材料的球晶生长速率。
In the present research, we successfully prepared a series of graphene oxide (GO)/biodegradable poly(ethylene adipate) (PEA) nanocomposites through a simple solution and precipitation process. The scanning electron microscopy observation revealed a fine dispersion of GO with a layered structure throughout the PEA matrix. The crystal structure, nonisothermal melt crystallization behavior, overall isothermal melt crystallization kinetics, spherulitic morphology, and spherulitic growth rate of the PEA/GO nanocomposites were investigated in detail and compared with those of neat PEA. Induced by the heterogeneous nucleation of GO, the crystallization processes of the nanocomposites were enhanced, when the samples were nonisothermally crystallized at a cooling rate of 5 °C min−1 or isothermally crystallized at crystallization temperature values ranging from 32 to 40 °C; however, the nanocomposites and neat PEA exhibited the same crystallization mechanism and crystal structure. Within the investigated temperature range of 24 to 32 °C, banded spherulite morphologies were observed for neat PEA and its nanocomposites. Moreover, it was interesting to find that GO not only enhanced the nucleation density as a nucleating agent but also increased the spherulitic growth rate of the nanocomposites by exhibiting a superstructure templating effect.