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Fabrication of in-situ nano-fibers reinforced molecular composites by non-equilibrium self-assembly.

A new interesting article has been published in ACS Appl Mater Interfaces. 2018 Oct 19. doi: 10.1021/acsami.8b15037. [Epub ahead of print] and titled:

Fabrication of in-situ nano-fibers reinforced molecular composites by non-equilibrium self-assembly.

Authors of this article are:

Guan Q, Yuan L, Gu A, Liang G.

A summary of the article is shown below:

Although the concept of molecular composites (MCs) is very promising, there are major obstacles arising from the immiscibility of the rigid-rod with the random-coil polymers. Here we developed a novel method for fabricating in-situ reinforced MC system with non-equilibrium self-assembled nano-fibrous structures based on bisphenol A epoxy resin, 4,4′-diaminodiphenylsulfone, bismaleimide, and polyphenylene ether (PPO) oligomer. A variety of spectroscopic and morphological techniques were used to probe the structural evolution from the emergence of nano-fibrils, to growth and aggregation of nano-fibers, and then to formation of in-situ reinforced MC with strong interfacial interaction. The in-situ nano-fibers within polymer matrix could be formed by polymerization force extruding PPO phase through the interspaces within simultaneous interpenetrating network (SIPN) polymers during the cure process of thermosetting resin system. As compared to the control sample, the in-situ nano-fibers reinforced MC exhibited better thermal property and flame retardancy. Especially, the obtained MC showed significant improvement in glass transition temperature and mechanical properties, which were mainly attributed to the restriction of high thermal stability PPO on the segmental motion of polymer chains, the toughening and reinforcement behaviors of PPO nano-fibers on the matrix and the chemical interaction at PPO/matrix interface.

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