Botta Luigi, Scaffaro Roberto, Sutera Fiorenza, Mistretta Maria Chiara
Department of Civil, Environmental, Aerospace and Materials Engineering, University of Palermo, RU INSTM of Palermo, Viale delle Scienze, 90128 Palermo, Italy.
Polymers (Basel). 2017 Dec 24;10(1):18. doi: 10.3390/polym10010018.
This work reports a study on the effect of multiple reprocessing on the properties of poly(lactic acid) (PLA) filled with graphene nanoplatelets (GnP) compared to the melt reprocessed neat polymeric matrix. In particular, morphological, X-Ray Diffraction and Micro-Raman analyses, intrinsic viscosity measurements, thermal, rheological and mechanical tests were carried out on materials reprocessed up five times by means of a single screw extruder. The results indicated that the presence of GnP decreased the degradation rate as a function of the reprocessing cycles in comparison with the neat PLA that, on the contrary, showed a more drastic reduction of the molecular weight. Moreover, the reprocessing improved the particle dispersion and reduced the presence of GnP aggregates.
本研究报告了与经熔体再加工的纯聚合物基体相比,多次再加工对填充石墨烯纳米片(GnP)的聚乳酸(PLA)性能的影响。具体而言,对通过单螺杆挤出机再加工达五次的材料进行了形态学、X射线衍射和显微拉曼分析、特性粘度测量、热性能、流变性能和力学性能测试。结果表明,与纯PLA相比,GnP的存在降低了再加工循环次数对降解速率的影响,相反,纯PLA的分子量有更显著的降低。此外,再加工改善了颗粒分散性并减少了GnP聚集体的存在。