The influence of filler morphology and surface hydroxyls on crepe-hardening of uncured silicone elastomers

How I met your elastomers: from network topology to mechanical behaviours of conventional silicone materials

“…Other consequences described by several authors are an apparent increase of the effective filler loading 43 , an increased amount of entanglements 14 or crosslinking density 44 . Changes in this chemistry impact the type of filler-filler and polymerfiller interaction (mainly hydrogen bonding 49 and covalent bonds 50 ), and indirectly the filler structuration during the material processing 2 . Changes in this chemistry impact the type of filler-filler and polymerfiller interaction (mainly hydrogen bonding 49 and covalent bonds 50 ), and indirectly the filler structuration during the material processing 2 .…”

“…44 These mechanisms are controlled by: (i) the ller loading, 45 whether or not percolation is attained, 46 (ii) the ller specic area, 47 (iii) the potential aggregation of the ller particles, 48 and (iv) the ller surface chemistry. Changes in this chemistry impact the type of ller-ller and polymer-ller interaction (mainly hydrogen bonding 49 and covalent bonds 50 ), and indirectly the ller structuration during the material processing. 2 As a result, the addition of silica in PDMS networks leads to an increase of the stress magnitude, the modulus, and even the elongation (up to a certain level).…”

1H/29Si cross‐polarization NMR experiments of silica‐reinforced polydimethylsiloxane elastomers: probing the polymer–filler interface

“…A more detailed understanding of the changes that take place during the shelf life of uncured elastomers is also of general interest to the silicone industry. 17 In this regard, DC745 serves as a model silicone elastomer. DC745 has already been studied extensively and a series of pristine and artificially aged samples have been prepared.…”

“…During storage, Crepe-hardening can result for uncross-linked siloxane filled with fumed silica. 17 Macroscopic measurements on filled gels are useful indicators of the reinforcing effect, but are incapable of providing information on the strength of the local interactions that govern the underlying mechanism. Clearly, adsorption forces must play a central role in the adhesion of the polymer to the filler and these ultimately control the macroscopic mechanical behavior.…”

Nanofibrillar Networks in Poly(ethyl methacrylate) and Its Silica Nanocomposites

“…1,2 Incorporation of such particles provides a versatile and efficient route to multifunctional materials possessing enhanced properties such as electrical conductivity, 3,4 nonlinear optics, 5,6 mechanical toughness, 7 catalytic activity, 2 separation selectivity, 8 and magnetism. 9 In this work, we only consider those nanocomposites prepared by the addition of inorganic particles, such as fumed or colloidal silica, to a polymer matrix.…”