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Friday, 20 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Characterising sustainable polyurethane modified by cyclic polysiloxane

Friday, 15 August 2014

A series of sustainable polyurethanes are prepared by introducing different content of cyclic polysilanol, which may act as a chain extender to replace 1, 4-butanediol (BDO).

Hybrid polyurethanes displayed enhanced glass transition temperatures
Source: henning schulz/Pixelio

Hybrid polyurethanes displayed enhanced glass transition temperatures
Source: henning schulz/Pixelio

Consequently, cyclic polysiloxanes are successfully incorporated into the molecular chains to afford organic-inorganic polyurethanes and then their effects on polyurethanes thermal properties and surface hydrophilicity are fully characterised by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and contact angle testing.

Enhanced glass transition temperatures

Results show that the hybrid polyurethanes display enhanced glass transition temperatures (Tg). While in terms of TGA, the effects of cyclic polysilanol on thermal properties seem complex, which would reduce the thermal stability in the first degradation process but enhance in the second process. The morphology observed by scanning electron microscopy (SEM) show that the inorganic constitutions, namely, cyclic polysilanol, may occur to self-condensation or aggregation, which can help to explain the uncommon thermal phenomenon above. Thus, an opportunity of future applicability in the areas of sustainable polymer with improved properties can be envisioned in the research method of hybrid polyurethanes.

The study is published in: Journal of Applied Polymer Science, Early View.

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