Polydiacetylene/organic magadiite nanocomposite film with stable reversible structure and reversible thermochromism.

The composite with strong interaction force was prepared based on organic magadiite (OMAG) and polydiacetylene (PDA). Structural analyses indicate that γ-Aminopropyl triethoxysilane (KH550) acts as a bridge, connecting PDA and OMAG by electrostatic interactions and hydrogen bonding. Thus, PDA can be assembled on OMAG orderly, which allows the PDA-KH550-OMAG to have the properties of reversible dynamic structural changes during hot and cold conversion. It stands for reversible thermochromism. To fabricate the film with higher strength and good applicability, we polymerized nanocomposite film in carboxymethylcellulose matrix via simple preparation method. The film change from bluish purple to red when heated from 20 to 80 ℃, and normalized signal can can recover to 1.2 after ten heating cycles. The film persists in different organic solutions stably, expanding the application scope in harsh environments to become better smart sensing materials. Other coupling agents are difficult to achieve the same results, which further illustrates that amino plays an essential role in the reversible conformation of PDA chain. [ABSTRACT FROM AUTHOR]