Lagarinhos Joana, Magalhães da Silva Sara, Oliveira José Martinho
EMaRT Group-Emerging: Materials, Research, Technology, University of Aveiro, 3810-193 Aveiro, Portugal.
School of Design, Management and Production Technologies, University of Aveiro, Estrada do Cercal 449, 3720-509 Oliveira de Azeméis, Portugal.
Polymers (Basel). 2023 Oct 17;15(20):4109. doi: 10.3390/polym15204109.
Thermoplastic resin transfer molding (T-RTM) technology was applied to synthesize graphene nanoplatelets-based nanocomposites via anionic ring-opening polymerization (AROP). Polyamide 6 (PA6) was obtained by AROP and was used as the polymeric matrix of the developed nanocomposites. The non-isothermal crystallization behavior of PA6 and nanocomposites was analyzed by differential scanning calorimetry (DSC). Nanocomposites with 0.5 wt.% of graphene nanoplatelets (GNPs) with two different diameter sizes were prepared. Results have shown that the crystallization temperature shifted to higher values in the presence of GNPs. This behavior is more noticeable for the nanocomposite prepared with smaller GNPs (PA6/GN). The crystallization kinetic behavior of all samples was assessed by Avrami and Liu's models. It was observed that GNPs increased the crystallization rate, thus revealing a nucleating ability, and also validated the reduction of half-time crystallization values. Such tendency was also supported by the lower activation energy values determined by Friedman's method.
热塑性树脂传递模塑（T-RTM）技术通过阴离子开环聚合（AROP）用于合成基于石墨烯纳米片的纳米复合材料。通过AROP获得聚酰胺6（PA6），并将其用作所开发纳米复合材料的聚合物基体。通过差示扫描量热法（DSC）分析PA6和纳米复合材料的非等温结晶行为。制备了含有0.5 wt.% 两种不同直径尺寸的石墨烯纳米片（GNPs）的纳米复合材料。结果表明，在存在GNPs的情况下，结晶温度向更高值移动。对于用较小GNPs制备的纳米复合材料（PA6/GN），这种行为更明显。通过Avrami模型和Liu模型评估所有样品的结晶动力学行为。观察到GNPs提高了结晶速率，从而显示出成核能力，并且还证实了结晶半衰期值的降低。Friedman方法确定的较低活化能值也支持了这种趋势。
