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The effect of nanoparticles shape on the mechanical properties of poly lactic acid matrix
Journal of Elastomers & Plastics ( IF 1.7 ) Pub Date : 2021-01-13 , DOI: 10.1177/0095244320988168
Sajjad Daneshpayeh 1 , Faramarz Ashenai Ghasemi 1 , Ismail Ghasemi 2
Affiliation  

In this research, mechanical properties of poly lactic acid (PLA)-based nanocomposites were investigated. The nanocomposites were fabricated by adding of three types of nano-materials including multi-walled carbon nanotubes (MWCNT), carbon black (CB) nanoparticles and graphene nano-platelets (GnPs) in four levels from 0 to 3 wt.% to PLA matrix by an internal mixer. Tensile and impact tests were performed to obtain the mechanical properties of nanocomposites. Moreover, field-emission scanning electron microscopy (FESEM) was used to observe the state of nano-fillers dispersion. The FESEM images showed that CB nanoparticles and MWCNT are well distributed in the matrix, but that GnPs are agglomerated. The results of the tensile tests showed that the addition of MWCNT and CB nanoparticles increased the tensile strength by 36% and 76% and the elastic modulus by 10% and 68%, respectively. Also, the presence of all three types of carbon fillers at low loading increased the elongation at break of PLA matrix, and this increase was more significant for GnPs by 55% in the 1 wt.% loading. Finally, the PLA polymer become more brittle with the addition of nanotubes and nano-platelets, and its impact strength was reduced. While, the CB nanoparticles increased the absorbing energy and impact strength.



中文翻译:

纳米颗粒形状对聚乳酸基质力学性能的影响

在这项研究中,研究了基于聚乳酸(PLA)的纳米复合材料的机械性能。纳米复合材料是通过将三种类型的纳米材料(包括多壁碳纳米管(MWCNT),炭黑(CB)纳米颗粒和石墨烯纳米片(GnPs))添加到PLA基质中从0到3 wt。%的四种含量而制成的通过内部混合器。进行拉伸和冲击测试以获得纳米复合材料的机械性能。此外,使用场发射扫描电子显微镜(FESEM)观察纳米填料的分散状态。FESEM图像显示CB纳米颗粒和MWCNT在基质中分布良好,但是GnP聚集了。拉伸试验的结果表明,MWCNT和CB纳米颗粒的添加分别使拉伸强度增加了36%和76%,并且弹性模量分别增加了10%和68%。同样,所有三种类型的碳填料在低负荷下的存在都会增加PLA基质的断裂伸长率,而对于GnP,在1 wt。%的负荷下,这种增加更为显着,达到了55%。最后,随着纳米管和纳米片的加入,PLA聚合物变得更脆,并且其冲击强度降低。同时,CB纳米颗粒增加了吸收能和冲击强度。随着纳米管和纳米片的加入,PLA聚合物变得更脆,其冲击强度降低。同时,CB纳米颗粒增加了吸收能和冲击强度。随着纳米管和纳米片的加入,PLA聚合物变得更脆,其冲击强度降低。同时,CB纳米颗粒增加了吸收能和冲击强度。

更新日期:2021-01-13
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