Rasana Nanoth, Jayanarayanan Karingamanna, Pegoretti Alessandro
Department of Chemical Engineering and Materials Science, Amrita School of Engineering, Amrita Vishwa Vidyapeetham Coimbatore India.
Centre of Excellence in Advanced Materials and Green Technologies (CoE-AMGT), Amrita School of Engineering, Amrita Vishwa Vidyapeetham Coimbatore India
RSC Adv. 2018 Nov 22;8(68):39127-39139. doi: 10.1039/c8ra07243d. eCollection 2018 Nov 16.
The non-isothermal crystallization kinetics of polypropylene (PP) reinforced with multiwalled carbon nanotubes (MWCNTs) and short glass fibres (GF) was studied by differential scanning calorimetry (DSC). The glass fibre concentration was maintained at 20 wt% and the MWCNT content ranged from 1 to 5 wt% in the PP matrix. The crystallization studies performed by DSC showed an increase in crystallization rate and a decrease in half time of crystallization of PP in the presence of micro and nano fillers. The Avrami, Ozawa, and Mo models were applied to analyze the non-isothermal crystallization behavior of PP multiscale composites. The Avrami model could very well describe the crystallization behavior of PP to 70% of the completion of crystallization. Beyond that level, it deviated significantly for all composites. On the other hand, the kinetics of crystallization could be well described by the Mo model. The strongest nucleating effect and the lowest activation energy were obtained for the composite with 2 wt% MWCNT and 20 wt% glass fibre. The X-ray diffraction analysis showed a significant reduction in the average crystal size in accordance with the amount of MWCNTs added.
采用差示扫描量热法（DSC）研究了多壁碳纳米管（MWCNT）和短玻璃纤维（GF）增强聚丙烯（PP）的非等温结晶动力学。玻璃纤维浓度保持在20 wt%，MWCNT在PP基体中的含量范围为1至5 wt%。通过DSC进行的结晶研究表明，在存在微米和纳米填料的情况下，PP的结晶速率增加，结晶半衰期缩短。应用Avrami、Ozawa和Mo模型分析了PP多尺度复合材料的非等温结晶行为。Avrami模型能够很好地描述PP结晶至70%完成时的结晶行为。超过该水平后，所有复合材料均出现显著偏差。另一方面，Mo模型能够很好地描述结晶动力学。对于含有2 wt% MWCNT和20 wt%玻璃纤维的复合材料，获得了最强的成核效果和最低的活化能。X射线衍射分析表明，平均晶体尺寸随着MWCNT添加量的增加而显著减小。
