Grafting kinetics of poly(methyl methacrylate) on microparticulate silica

Abstract

Grafting of poly(methyl methacrylate) (PMMA) on microparticulate silica was achieved by initiating the polymerization of MMA by 4,4'-azobis(4-cyanopentanoic acid) that was covalently bound to the silica surface. The initiator seems to be destabilized upon binding it to the silica surface. The kinetics of the graft polymerization are described and are largely affected by the Trommsdorff effect, which makes it possible to graft a high amount of PMMA on silica.

Preparation of polyamide 6/silica nanocomposites from silica surface initiated ring-opening anionic polymerization

“…Figure 2 shows the FTIR spectra of pristine silica (spectrum A), SiO 2 -NCO (1) (spectrum B), caprolactam-functionalized silica (2) (spectrum C), and the PA6/silica nanocomposites (3) (spectrum D). The FTIR spectrum of unmodified silica is relatively simple and well assigned [27]. The strong absorbance at 1099 cm -1 is attributed to the Si-O-Si stretch of silica, the absorbances at 1631 and 3434 cm -1 are assigned to the surface hydroxyl groups of silica ( Figure 2, spectrum A).…”

Anionic grafting of polystyrene and poly(styrene-block-isoprene) onto microparticulate silica and glass slides

“…Dietz et al 11 and Tsubokawa et al 19 used amine groups introduced to the surface of silica and carbon black respectively to initiate the polymerization of N-carboxy anhydrides in order to prepare end-grafted polypeptides. Nakatsuka x, Laible et al 3, Fery et al 4 and Boven et al 12 immobilized an azo-initiator at the surface of silica and glass slides. Large amounts of grafted polymer could be obtained this way.…”

“Living” Free Radical Photopolymerization Initiated from Surface-Grafted Iniferter Monolayers

“…In most cases, conventional radical initiating species 6,7 or ionic moieties 8,9 are introduced on the surface. For the polymerization of block copolymers and for controlling the molecular weight, and thus layer thickness as well as the composition, one is restricted to using the "living" polymerization technique.…”