Accelerated weathering of polymethylmethacrylate (PMMA) and of hybrid PMMA/SiO₂/ZrO₂ films was monitored by spectroscopic, thermal and colorimetric measurements. The hybrid polymers were obtained by sol-gel process adding tetraethylorthosilicate (TEOS) and zirconyl chloride (ZrOCl₂*8H₂O) to a solution of PMMA. Photo ageing tests on polymeric films under artificial sunlight irradiation in a climatic chamber suggest that the addition of the inorganic fillers slows down the chemical degradation of PMMA. The polymers were deposited on two different sandstones from Tuscany (Italy): Pietra Dorata and Pietra Serena. Capillary water absorption, contact angle and color measurements show that the hybrid-PMMA coatings retain the water repellency of the sandstone and do not introduce noticeable changes of the aesthetic appearance. Accelerated weathering of the treated sandstone confirms that the SiO₂/ZrO₂ inorganic filler delays the chromatic changes of the polymer.

The hybrid coating may then be proposed for application in the field of outdoor conservation of sandstones, used as building material in ancient and modern architectures.

聚甲基丙烯酸甲酯（PMMA）和PMMA / SiO ₂ / ZrO ₂杂化薄膜的加速风化通过光谱，热和比色法监测。通过将原硅酸四乙酯（TEOS）和氧化锆氯化物（ZrOCl ₂ * 8H ₂ O）添加到PMMA溶液中的溶胶-凝胶法获得杂化聚合物。在气候室内人工阳光照射下对聚合物薄膜进行的光老化测试表明，添加无机填料会减慢PMMA的化学降解。聚合物沉积在意大利托斯卡纳的两种不同的砂岩上：彼得拉·多拉塔（Pietra Dorata）和彼得拉·塞雷纳（Pietra Serena）。毛细管吸水率，接触角和颜色测量结果表明，杂化PMMA涂层保留了砂岩的拒水性，并且不会引起美学外观的明显变化。处理过的砂岩的加速风化证实了SiO ₂ / ZrO ₂无机填料延迟了聚合物的颜色变化。

然后可以提出将杂化涂料用于户外砂岩保护领域，该砂岩在古代和现代建筑中用作建筑材料。