Related Experiment Video
Updated: Feb 12, 2026

Biological Preparation and Mechanical Technique for Determining Viscoelastic Properties of Zonular Fibers
Published on: December 16, 2021
Investigation on the mechanical properties of polyurea (PU)/melamine formaldehyde (MF) microcapsules prepared with
Jianfeng Hu1, Xiaotong Zhang2, Jinqing Qu1
1a School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou , PR China.
Abstract:
There is lack of understanding on controlling of mechanical properties of moisture-curing PU/MF microcapsules which limited its further application. PU/MF microcapsules containing a core of isophorone diisocyanate (IPDI) were prepared with different chain extenders, polyetheramine D400, H2O, triethylenetetramine and polyetheramine (PEA) D230 by following a two-step synthesis method in this study. Fourier transform infra-red (FTIR) spectroscopy, Malvern particle sizing, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). And micromanipulation technique was used to identify chemical bonds in the shell, size distributions, structure, thickness, and mechanical properties of microcapsules. The results show that PU/MF microcapsules were successfully prepared. Tr increased from 46.4 ± 13.9 N/m to 75.8 ± 23.3 N/m when extender changed from D400 to D230. And the Tr increased from 51.3 ± 14.1 to 94.8 ± 17.5 N/m when the swelling time increased from 1 to 3h. Morphologies of the shell were utilised to understand the mechanism of reactions in forming the shell materials.
More Related Videos
Related Concept Videos
Radical Chain-Growth Polymerization: Mechanism
Anionic Chain-Growth Polymerization: Mechanism
Cationic Chain-Growth Polymerization: Mechanism
Electron Transport Chains
The ETC is comprised of...
Radical Chain-Growth Polymerization: Chain Branching
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

