Probing ultraviolet-induced dissociation of hydrogen bond networks in tyrosine by terahertz spectroscopy.

Tyrosine (Tyr) has gained significant attention as one of the most sensitive amino acids. Its oxidation is accompanied by changes in hydrogen bonds, so the oxidation process of Tyr is monitored and the dissociation sequence of different hydrogen bond network is elucidated based on the sensitivity of terahertz (THz) waves to intermolecular interactions. We find that the peak height of Tyr at 0.

Facile Fabrication of Eucommia Rubber Composites with High Shape Memory Performance.

We processed a series of shape memory Eucommia rubber (ER) composites with both carbon-carbon and ionic cross-linking networks via a chemical cross-linking method. The influence of the carbon-carbon cross-linking and ion cross-linking degree of ER composites on curing, mechanical, thermal, and shape memory properties were studied by DSC, DMA, and other analytical techniques. Dicumyl peroxide (DCP) and zinc dimethacrylate (ZDMA) played a key role in preparing ER composites with a double cross-linking structure, where DCP initiated polymerization of ZDMA, and grafted ZDMA onto polymer molecular chains and cross-linked rubber molecular chains.