Single-molecular hybrid nano-cylinders: Attaching polyhedral oligomeric silsesquioxane covalently to poly(glycidyl methacrylate) cylindrical brushes
✍ Scribed by Youyong Xu; Jiayin Yuan; Axel H.E. Müller
- Book ID
- 104088080
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 987 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0032-3861
No coin nor oath required. For personal study only.
✦ Synopsis
We present the preparation of novel single-molecular hybrid nano-cylinders by covalently attaching a monothiol-functionalized polyhedral silsesquioxane (POSS-SH) to poly(glycidyl methacrylate) (PGMA) cylindrical brushes. Grafting of GMA from a long poly-initiator poly(2-(2-bromoisobutyryloxy)ethyl methacrylate) (PBIEM) via ATRP was first carried out. Gel permeation chromatography (GPC), 1 H NMR, dynamic light scattering (DLS), static light scattering (SLS) and atomic force microscopy (AFM) measurements confirmed the well-defined worm-like structures of the PGMA brushes. Then POSS-SH was covalently linked to PGMA brushes by reaction with about 19% of the epoxy groups. The successful preparation of the PGMA-POSS hybrid brush was demonstrated by Fourier-transform infrared spectroscopy (FTIR), DLS, SLS, energy dispersive X-ray spectroscopy (EDX) and thermogravimetric analysis (TGA) measurements. An increase of the length and diameter of the brushes was shown by AFM and non-stained transmission microscopy (TEM) measurements. Residual SiO 2 after pyrolysis of the PGMA-POSS hybrid brush in air displayed interesting cylindrical network structures.