Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Road, Kent Hale Smith Bldg, Cleveland, Ohio 44106, United States.
College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China.
ACS Appl Bio Mater. 2021 May 17;4(5):4176-4183. doi: 10.1021/acsabm.0c01670. Epub 2021 Apr 22.
Mechanochemical vitrimerization, as a method to recycle cross-linked thermosets by converting the permanent network into a recyclable and reprocessable vitrimer network, inevitably requires a catalyst to accelerate the bond exchange reactions. Here, we demonstrate a catalyst-free approach to achieve the recycling of a cross-linked biobased epoxy into high-performance nanocomposites with cellulose nanocrystals (CNCs). CNCs provide abundant free hydroxyl groups to promote the transesterification exchange reactions while also acting as reinforcing fillers for the resultant nanocomposites. This technique introduces an effective way to fabricate high-performance thermoset nanocomposites based on recycled polymers in an ecofriendly way, promoting the recycle and reuse of thermosets as sustainable nanocomposites for different applications.
机械化学动态键化作用是一种通过将永久网络转化为可回收和可再加工的动态键网络来回收交联热固性塑料的方法，不可避免地需要催化剂来加速键交换反应。在这里，我们展示了一种无需催化剂的方法，可将交联的生物基环氧树脂回收成具有纤维素纳米晶体（CNC）的高性能纳米复合材料。CNC 提供了丰富的游离羟基，以促进酯交换反应，同时也作为增强填料用于所得的纳米复合材料。该技术为基于回收聚合物的高性能热固性纳米复合材料的制造提供了一种有效方法，以环保的方式促进热固性塑料的回收和再利用，作为可持续的纳米复合材料，用于不同的应用。
