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Rheologica Acta

Erschienen in:

01.12.2011 | Original Contribution

Viscoelastic properties of a silicone resin during crosslinking

verfasst von: Friedrich Wolff, Christoph Kugler, Helmut Münstedt

Erschienen in: Rheologica Acta | Ausgabe 11-12/2011

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Abstract

Viscoelastic properties of a silicone resin crosslinked at various extents were characterised by means of rheology. The influence of temperature on the viscoelastic properties of the material as-delivered and in a state pre-crosslinked approximately to the gel point has been investigated by dynamic-mechanical measurements. While the glass transition temperature is increased by the crosslinking, no changes of the free volume fraction at T _g and its thermal expansion coefficient were observed. Taking the different glass transition temperatures into account, it could be shown that the corresponding WLF-parameters are the same. The molar mass and, hence, the viscosity of the material can be increased by a heat treatment. The dependence of the zero shear-rate viscosity on the weight average molar mass indicates that the existence of entanglements of the polymer molecules is not very probable.

Vorheriger Artikel Using rheometry to determine nucleation density in a colored system containing a nucleating agent

Nächster Artikel Strain stiffening of non-colloidal hard sphere suspensions dispersed in Newtonian fluid near liquid-and-crystal coexistence region

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Steady-state measurements at shear rates higher than 10 s^− 1 were not possible since in this case the material flows out of the gap.

For low frequencies, the phase angle δ reaches values of almost 90°. Values higher than 89.9° cannot be resolved any more resulting in incorrect measurements of G ^′. Therefore, at low frequencies the values of G ^′ are not shown in Fig. 4, but the trend is indicated by the dotted line. Investigating another batch of the same type of silicone resin, Takahashi et al. (2001a) observed a bending of the G ^′ curve at about 5 rad/s. Such a bending was not found in the present work. The reasons for that are not clear, but possibly it can be explained by a different pretreatment of the samples prior to the measurement.

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Titel: Viscoelastic properties of a silicone resin during crosslinking
verfasst von: Friedrich Wolff
Christoph Kugler
Helmut Münstedt
Publikationsdatum: 01.12.2011
Verlag: Springer-Verlag
Erschienen in: Rheologica Acta / Ausgabe 11-12/2011
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-010-0513-2

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