The probable influence of in situ thermal reduction of graphene oxides on the crystallization behavior of isotactic polypropylene

The probable influence of in situ thermal reduction of graphene oxides on the crystallization behavior of isotactic polypropylene
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氧化石墨烯原位热还原对等规聚丙烯结晶行为的可能影响

DOI:
10.1016/j.polymer.2014.06.003
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发表时间:
2014-08
期刊:
影响因子:
4.6
通讯作者:
Feng Jiachun
Feng Jiachun
中科院分区:
化学2区
文献类型:
--
作者:
Fan Jiashu;Huang Ruijin;Ye Shibing;Li Tianjiao;Feng Jiachun

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通过比较 iPP 在 200 °C 下不同退火程序的结晶行为,系统地研究了氧化石墨烯 (GO) 的原位热还原对等规聚丙烯 (iPP) 结晶的影响。偏光显微镜和差示扫描量热法结果表明,对于退火后的iPP/GO复合材料,随着退火时间的增加,成核位点数量和结晶速率均下降,而纯iPP则观察不到这种效应。对含有还原 GO 的 iPP 的比较实验表明,如果 GO 已经高度还原,则 iPP 的结晶行为不会受到退火的影响。通过温度相关的傅里​​叶变换红外光谱进一步研究表明,退火对 iPP/GO 结晶的负面影响与结晶过程中构象有序程度的降低有关。我们的结果表明,熔融退火可以改变带有 GO 的 iPP 的结晶行为,这种改变可能是由热还原引起的 GO 片材化学变化引起的。
The influence of insituthermal reduction of graphene oxides (GO) on the isotactic polypropylene (iPP) crystallization were systematically investigated by comparing the crystallization behavior of iPP with different annealing procedures at 200 °C. Polarizing optical microscopy and differential scanning calorimetry results show that, for iPP/GO composite after annealing, both the number of nucleation sites and the rate of crystallization decrease with the increase of annealing time, while this effect cannot be observed for neat iPP. Comparative experiments on iPP containing reduced GO demonstrate that the crystallization behavior of iPP cannot be affected by annealing if GO is already highly reduced. Further investigation by temperature dependent Fourier transform infrared spectra indicates that the negative influence of annealing on iPP/GO crystallization is associated with the decrease in the degree of conformational ordering during the process of crystallization. Our results suggest that the melt annealing can alter the crystallization behavior of iPP with GO and this alteration is probably caused by the thermal reduction-induced chemical changes on GO sheets.
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