Sisti Laura, Totaro Grazia, Celli Annamaria, Giorgini Loris, Ligi Simone, Vannini Micaela
Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, DICAM, Università di Bologna, via Terracini 28, 40131 Bologna, Italy.
Dipartimento di Chimica Industriale 'Toso Montanari', Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy.
Polymers (Basel). 2021 Apr 23;13(9):1377. doi: 10.3390/polym13091377.
In situ intercalative polymerization has been investigated as a strategic way to obtain poly(propylene 2,5-furandicarboxylate) (PPF) and poly(hexamethylene 2,5-furandicarboxylate) (PHF) nanocomposites with different graphene types and amounts. Graphene (G) has been dispersed in surfactant stabilized water suspensions. The loading range in composites was 0.25-0.75 wt %. For the highest composition, a different type of graphene (XT500) dispersed in 1,3 propanediol, containing a 6% of oxidized graphene and without surfactant has been also tested. The results showed that the amorphous PPF is able to crystallize during heating scan in DSC and graphene seems to affect such capability: G hinders the polymer chains in reaching an ordered state, showing even more depressed cold crystallization and melting. On the contrary, such hindering effect is absent with XT500, which rather induces the opposite. Concerning the thermal stability, no improvement has been induced by graphene, even if the onset degradation temperatures remain high for all the materials. A moderate enhancement in mechanical properties is observed in PPF composite with XT500, and especially in PHF composite, where a significative increase of 10-20% in storage modulus E' is maintained in almost all the temperature range. Such an increase is also reflected in a slightly higher heat distortion temperature. These preliminary results can be useful in order to further address the field of application of furan-based polyesters; in particular, they could be promising as packaging materials.
原位插层聚合已被研究作为一种获取具有不同类型和含量石墨烯的聚（2,5 - 呋喃二甲酸丙二醇酯）（PPF）和聚（2,5 - 呋喃二甲酸己二醇酯）（PHF）纳米复合材料的策略性方法。石墨烯（G）已分散在表面活性剂稳定的水悬浮液中。复合材料中的负载范围为0.25 - 0.75 wt%。对于最高组成，还测试了一种分散在1,3 - 丙二醇中、含有6%氧化石墨烯且无表面活性剂的不同类型石墨烯（XT500）。结果表明，无定形PPF在DSC加热扫描过程中能够结晶，并且石墨烯似乎会影响这种能力：G阻碍聚合物链达到有序状态，表现出更明显的冷结晶和熔融抑制。相反，XT500不存在这种阻碍作用，反而起到相反的作用。关于热稳定性，石墨烯并未引起热稳定性的提高，尽管所有材料的起始降解温度仍然很高。在含有XT500的PPF复合材料中观察到机械性能有适度增强，特别是在PHF复合材料中，在几乎所有温度范围内储能模量E'都有10 - 20%的显著增加。这种增加也反映在略高的热变形温度上。这些初步结果对于进一步拓展呋喃基聚酯的应用领域可能是有用的；特别是，它们有望作为包装材料。
