Miao, Pengcheng; Leng, Xuefei; Liu, Jie; Song, Guanjun; He, Maomao; Li, Yang published the artcile< Regulating the Dynamic Behaviors of Transcarbamoylation-Based Vitrimers via Mono-Variation in Density of Exchangeable Hydroxyl>, Related Products of 112-63-0, the main research area is dynamic behavior transcarbamoylation vitrimer.
The dynamic behaviors of vitrimer are influenced by the interaction of crosslink d. and d. of exchangeable groups, which results in the difficulty of extracting the effect of mono-variation. In this study, the dynamic behaviors of vitrimer were tuned by changing the d. of exchangeable hydroxyls alone, while leaving the crosslink d. undisturbed. A multi-hydroxy vitrimer network without a loading catalyst was synthesized successfully. Three-armed functionalized polycarbonate, obtained by ring-opening polymerization of 1,3-dioxan-2-one and its derivatives, was treated as a precursor polymer. Afterward, the precursor polymer was converted into vitrimer in a single step by treatment with hexamethylene diisocyanate. When the system with constant crosslink d. was established, the accurate effect of the hydroxyl d. on the dynamic behaviors could be characterized by stress relaxation. The relationship of essential dynamic behavioral parameters, such as topol. freezing transition temperature (Tv), exchange activation energy (Ea), and Arrhenius prefactor (τ0), with the d. of exchangeable hydroxyls was quant. discussed. The results indicated that Tv and Ea were neg. correlated with the d. of exchangeable hydroxyls, while τ0 showed a pos. correlation. In addition, linear models were developed to describe the relationship between dynamic behaviors of vitrimer and d. of exchangeable hydroxyls. It is expected that the findings can be applied to precisely control Ea, τ0, Tv, and characteristic relaxation time (τ*) of vitrimer and can also be used as a model for the synthesis of various vitrimer materials.
Macromolecules (Washington, DC, United States) published new progress about Activated charcoal Role: CAT (Catalyst Use), USES (Uses). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics