ESPCI-ParisTech, PSL Research University, Matière Molle et Chimie, UMR 7167 CNRS-ESPCI, 10 rue Vauquelin, Paris, 75005, France.
ESPCI-ParisTech, PSL Research University, Sciences analytiques, bioanalytiques et miniaturisation, UMR CBI 8231 CNRS/ESPCI/UPMC, France.
Soft Matter. 2016 May 25;12(21):4838-45. doi: 10.1039/c6sm00257a.
Vitrimers appear as a new class of polymers that exhibit mechanical strength and are insoluble even at high temperatures, like thermosets, and yet, like thermoplastics, they are heat processable, recyclable and weldable. The question arises whether this welding property is maintained in composite materials made of more than 50 vol% of reinforcing fibers. In this paper, we quantitatively analyze the bond strength of epoxy vitrimer-based composite plates made by resin transfer molding and compare them to their non-vitrimer counterparts made of a standard thermoset epoxy. It is demonstrated that only epoxy vitrimer samples show substantial bond strength and the ability to be repeatedly welded thanks to the exchange reactions, which promote improved surface conformity and chemical bonding between the adherands at the joint interface. This opens the way towards joining composite parts without adhesives nor mechanical fasteners.
弹性体表现为一类新型聚合物，它们具有机械强度，即使在高温下也不溶解，类似于热固性塑料，而且它们像热塑性塑料一样可热加工、可回收和可焊接。问题是，在由超过 50 体积%增强纤维制成的复合材料中，这种焊接性能是否得到保持。在本文中，我们通过定量分析树脂传递模塑法制备的基于环氧树脂的弹性体复合材料板的结合强度，并将其与由标准热固性环氧树脂制成的非弹性体复合材料板进行比较。结果表明，只有环氧树脂弹性体样品显示出显著的结合强度和可重复焊接的能力，这要归功于促进接头界面处的粘附剂之间改善的表面一致性和化学键合的交换反应。这为不使用粘合剂或机械紧固件连接复合材料部件开辟了道路。
