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The protection of solar energy collecting technology against overheating can be achieved using the co-polymer reported here. In the form of a semi-interpenetrating polymer network, te co-polymer demixes when the temperature rises above a certain value “which can be tuned between 30 and 150°C by adjusting the ratio of the repeat units of the components”. In the phase-separated state the light transmission of the material is reduced significantly by backward light scattering.