Constant-Mandiola Benjamin, Aguilar-Bolados Héctor, Geshev Julian, Quíjada Raul
Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beauchef 851, Santiago 8370456, Chile.
Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 3349001, Chile.
Polymers (Basel). 2021 May 18;13(10):1635. doi: 10.3390/polym13101635.
A study addressed to develop new recyclable and/or biodegradable magnetic polymeric materials is reported. The selected matrices were polypropylene (PP) and poly (lactic acid) (PLA). As known, PP corresponds to a non-polar homo-chain polymer and a commodity, while PLA is a biodegradable polar hetero-chain polymer. To obtain the magnetic nanocomposites, magnetite supported on thermally reduced graphene oxide (TrGO:FeO nanomaterial) to these polymer matrices was added. The TrGO:FeO nanomaterials were obtained by a co-precipitation method using two types of TrGO obtained by the reduction at 600 °C and 1000 °C of graphite oxide. Two ratios of 2.5:1 and 9.6:1 of the magnetite precursor (FeCl) and TrGO were used to produce these nanomaterials. Consequently, four types of nanomaterials were obtained and characterized. Nanocomposites were obtained using these nanomaterials as filler by melt mixer method in polypropylene (PP) or polylactic acid (PLA) matrix, the filler contents were 3, 5, and 7 wt.%. Results showed that TrGO-based nanomaterials presented higher coercivity (Hc = 8.5 Oe) at 9.6:1 ratio than TrGO-based nanomaterials (Hc = 4.2 Oe). PLA and PP nanocomposites containing 7 wt.% of filler presented coercivity of 3.7 and 5.3 Oe, respectively. Theoretical models were used to analyze some relevant experimental results of the nanocomposites such as mechanical and magnetic properties.
报道了一项旨在开发新型可回收和/或可生物降解磁性聚合物材料的研究。所选基体为聚丙烯（PP）和聚乳酸（PLA）。众所周知，PP是一种非极性均链聚合物且是一种商品，而PLA是一种可生物降解的极性杂链聚合物。为了获得磁性纳米复合材料，将负载在热还原氧化石墨烯（TrGO:FeO纳米材料）上的磁铁矿添加到这些聚合物基体中。TrGO:FeO纳米材料通过共沉淀法获得，使用的两种TrGO是通过在600℃和1000℃对氧化石墨进行还原得到的。磁铁矿前驱体（FeCl）与TrGO的两种比例2.5:1和9.6:1被用于制备这些纳米材料。因此，获得了四种类型的纳米材料并对其进行了表征。通过熔体混合法将这些纳米材料作为填料用于聚丙烯（PP）或聚乳酸（PLA）基体中制备纳米复合材料，填料含量分别为3、5和7 wt.%。结果表明，比例为9.6:1的基于TrGO的纳米材料的矫顽力（Hc = 8.5 Oe）高于比例为2.5:1的基于TrGO的纳米材料（Hc = 4.2 Oe）。含有7 wt.%填料的PLA和PP纳米复合材料的矫顽力分别为3.7 Oe和5.3 Oe。使用理论模型分析了纳米复合材料的一些相关实验结果，如力学性能和磁性能。
