## Experimental Section
### Synthesis
#### 3.2.3 Measurements  
NMR Spectroscopy: \({}^{1}\)H and \({}^{13}\)C NMR spectra were recorded on a Bruker DPX-300 FT-NMR spectrometer at 300 MHz and 75 MHz, respectively. Dimethyl sulfoxide (DMSO-\(d_{6}\)) or chloroform (CDCl\({}_{3}\)) was used as the solvent. Tetramethyl silane (TMS) served as internal standard. Gel permeation chromatography: (GPC) analyses were carried out using a high pressure liquid chromatography pump (ERC HPLC 64200) and a refractive index detector (ERC 7515A) at 35 \({}^{\circ}\)C. The eluting solvent was tetrahydrofuran (THF) with 250 mg\(\cdot\)L-1 2,6-di-_tert_-butyl-4-methylphenol (Aldrich) and a flow rate of 1.0 mL\(\cdot\)min\({}^{-1}\). Four columns with MZ-DVB gel were applied. The length of each column was 300 mm, the diameter 8 mm, the diameter of the gel particles 5 \(\upmu\)m, and the nominal pore widths were 50, 100, 1000 and 10,000 A. Calibration with poly(methyl methacrylate) (PMMA) standards was used to estimate the molecular weights. Film preparation: A defined amount of polymer was dissolved in THF and filtered through a 0.2 \(\upmu\)m pore size filter prior use. The films were prepared either by spin coating or by spraying a dilute polymer solution onto substrates. To assess the layer homogeneity, the minimum thickness and the coating performance two types of substrates were studied. Silicone oxide as model surface since it has low roughness and high reflective index compared to SCG substrates. The thickness of the coating was controlled by the polymer concentration. Systematic variation of the polymer concentration from 10 wt % down to 0.1 wt % yields coatings that span the range from hundreds down to tens of nanometer. Substrates and cleaning procedure: The self-cleaning glass SCG, activ and bioclean [38, 39], was provided by Pilkington UK and Saint Gobain glass Germany, respectively. The Glass is coated with titanium dioxide (TiO\({}_{2}\)) photocatalyst in its nanocrystalline anatase form. TiO\({}_{2}\) is deposited onto 4 mm  
Figure 7: Structure of poly(acrylic acid-_co_-allyl acrylate) with \({}^{1}\)H-NMR assignment. float glass as a thin film (typically 10-20 nm) by an atmospheric pressure chemical vapor deposition technique, APCVD. A barrier layer of silicon oxide is necessary between the soda-lime silicate glass substrate and the deposited titanium dioxide layer to prevent alkaline metal ion migration between these two layers. The TiO\({}_{2}\) free glass, Planilux, was provided by Saint Gobain Recherche (France). The glass sample has a rectangular shape with a size of (\(130\times 45\)) mm\({}^{2}\). The glass was cleaned with detergent and extensively rinsed with demineralised water and methanol. The dried glass samples were exposed to UV irradiation for 4 hours. Systematically the contact angle of water droplet on the activated SCG surfaces was measured and found to be below 20\({}^{\circ}\), which indicates the cleanness of the surface and the photo-activation of the TiO\({}_{2}\) layer. Silicone sealants: Silicone sealant is a curable resin designed for general weather-sealing. It is a silicone formulation that cures to a flexible rubber designed to seal the glass on a frame. Two types of sealants were studied, namely DC 791 and DC 756 provided by Dow Corning. According to the producer the two formulations differ in the working time: 15 min for DC791 and 30 min for DC 756, and in the time free tack: 35 min for DC 791 and 120 min for DC 756. Basically, this difference indicates to which extend the cross-linking reaction has been proceeded inducing increase of the viscosity and in the later curing time hardening. Deposition of curable silicone sealant on glass: Defined amount of sealant was applied at the edge of the SCG to cover a surface area of (\(10\times 45\)) mm\({}^{2}\). The effect of the sealants on the SCG surface was assessed by measuring the variation of the water contact angle with ageing time at room temperature.