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首页> 外文期刊>RSC Advances >Unusual crystallization behavior of biodegradable poly(ethylene adipate) based nanocomposites induced by graphene oxide
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Unusual crystallization behavior of biodegradable poly(ethylene adipate) based nanocomposites induced by graphene oxide

机译：氧化石墨烯诱导的可生物降解的聚己二酸乙二醇酯基纳米复合材料的异常结晶行为

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摘要

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 degrees C min(-1) or isothermally crystallized at crystallization temperature values ranging from 32 to 40 degrees C; however, the nanocomposites and neat PEA exhibited the same crystallization mechanism and crystal structure. Within the investigated temperature range of 24 to 32 degrees 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.
机译：在本研究中，我们通过简单的溶液和沉淀过程成功制备了一系列氧化石墨烯（GO）/可生物降解的聚己二酸乙二醇酯（PEA）纳米复合材料。扫描电子显微镜观察表明，在整个PEA基质中GO具有层状结构的精细分散。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，球状形态和球状生长速率，并将其与纯PEA进行了比较。当样品在5℃min（-1）的冷却速率下进行非等温结晶或在32至40℃的结晶温度下进行等温结晶时，由于GO的异质成核作用，纳米复合材料的结晶过程得以增强。 ;然而，纳米复合材料和纯净的PEA表现出相同的结晶机理和晶体结构。在研究的24至32摄氏度的温度范围内，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不仅通过表现出超结构模板效应而增强了作为成核剂的成核密度，而且还提高了纳米复合材料的球状生长速率。

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