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Functionalization of Living Polymers via Ethoxysilane Based Compounds: Synthesis and Interaction with Silica Particles
Author(s) -
Hoffstetter Joël,
Giebeler Ellen,
Peter Rolf,
Lutz Pierre J.
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200451126
Subject(s) - surface modification , polymer , bifunctional , styrene , anionic addition polymerization , alkoxy group , polymer chemistry , yield (engineering) , chemical modification , materials science , chemistry , organic chemistry , chemical engineering , copolymer , catalysis , alkyl , metallurgy , engineering
To optimize the reaction of ω‐carbanionic styrene or butadiene/styrene polymers with ethoxysilane based compounds, the influence of several experimental parameters on the orientation of the functionalization reaction and its yield was examined. The resulting end‐functionalized polymers were systematically investigated by SEC, 1 H NMR and elementary analysis. The orientation of the reaction was found to be directly depending on the chemical nature of the chain end and / or on the type of additive (ethers, LiCl). Best results were obtained with tetraethoxysilane, provided the functionalization is conducted around 5°C, and the active chain end of isoprenyl type. These reactions were extended to bifunctional polymers, the reaction product of butyllithium with m‐diisopropenylbenzene being used as an initiator. The efficiency of this initiator for the synthesis of well‐defined bifunctionalized polydienes almost quantitatively fitted with three alkoxy functions at both chain ends was demonstrated. Some preliminary results on the mechanical properties of mixtures of functionalized polymers with silica were mentioned.