Nanokomposite mit 0.5 bis 3 nm großen Strukturdomänen durch Polymerisation von Silicium‐Spiroverbindungen

Abstract

Aus eins mach zwei: Ausgehend von einer leicht polymerisierbaren Silicium‐Spiroverbindung gelingt es, in einem einzelnen Prozessschritt zwei interpenetrierende Polymerstrukturen – SiO2 und Phenolharz – ohne die Bildung von Beiprodukten herzustellen. Diese neue Polymerisationsmethode ist auf verschiedenste Monomere anwendbar und macht Polymermaterialien mit Domänengrößen von 0.5 bis 3 nm zugänglich.

Nanostructured Organic–Inorganic Composite Materials by Twin Polymerization of Hybrid Monomers

“…Using this method, nanoporous carbon materials with BET surface areas of over 1000 m 2 g À1 have been synthesized, in which more than 85% of the pores had a radius less than 1 nm. [14] This result shows that the complementary (now washed-out) silica-gel phase must have a dimension of less than 1 nm, which supports the claim that twin polymerization of hybrid monomers results in nanostructures with sizes between 0.5 and 2 nm.…”

“…It can be obtained from salicyl alcohol and Si(OC 2 H 5 ) 4 by transesterification using fluoride as catalyst and toluene as the solvent. [14] The net equation given above has been confirmed by means of 13 C and 29 Si solid-state NMR spectroscopy of the phenolic-resin/SiO 2 nanocomposite obtained, just as in the polymerization of TFOS. From 2,2 0 -spirobis [4H-1,3,2-benzodioxasiline], a nanostructured phenolic-resin/SiO 2 Type-I hybrid material is formed in only one step by cationic polymerization initiated by a Brønsted acid (CF 3 COOH or CH 3 SO 3 H).…”

Novel Adhesion Promoter for Metal–Plastic Composites

“…[10][11][12] TMs offer the possibility of introducing various functional groups. [10][11][12] TMs offer the possibility of introducing various functional groups.…”

“…[1] In order to reduce the weight of construction without neglecting its strength and stability and to overcome the disadvantages of FRPs such as low formability, low hardness, and high sensibility during drilling, FRP-metal hybrid components are applied. [10][11][12] During twin polymerization, two homopolymers are produced from one twin monomer (TM). Mechanical fastening by using bolts or rivets is a simple method to achieve a high joining strength with a small scatter, as summarized by Matsuzaki et al [2] However, this widely used technique shows disadvantages because of additional connecting elements, which increase the weight of the whole structure.…”

Polyamide 6/silica hybrid materials by a coupled polymerization reaction

“…The formation of both polymers occurs mechanistically coupled, which is the reason for the smooth nanostructure formation. 30,35,36 Monomers which are used in twin polymerization are called twin monomers. The objective of this publication is the development of a coupled polymerization procedure for synthesis of PA6/SiO 2 hybrid materials within one process.…”