Radiata pine (Pinus radiata Don.) sapwood was treated with an aqueous dispersion solution of styrene/acrylic acid (St/AA) copolymer (5, 15, or 25%) and the treatment effect on weathering of wood was determined. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy suggested that the St/AA treatment delayed lignin degradation during artificial weathering; the protection effect increased with St/AA concentration. Decrease in water contact angle upon weathering for the treated wood was also slower than for the untreated control. Scanning electron microscopy revealed that the St/AA polymer filled some wood cell lumina, which facilitates to inhibit moisture and light (especially ultraviolet light) penetration into wood. During 12 months of outdoor exposure, the St/AA-treated wood boards had lower moisture content and less detachment of earlywood cells than the untreated controls. Treatments with St/AA stabilized the surface color by inhibiting photo-oxidation of cell wall polymers and propagation of staining fungi. The results suggest that treatment with St/AA can substantially improve wood’s resistance to weathering.

中文翻译：

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通过水性苯乙烯/丙烯酸共聚物分散体处理增强辐射松木材的耐候性

辐射松 (Pinus radiata Don.) 边材用苯乙烯/丙烯酸 (St/AA) 共聚物（5%、15% 或 25%）的水性分散液进行处理，并确定处理对木材风化的影响。傅里叶变换红外光谱和 X 射线光电子能谱表明 St/AA 处理延迟了人工风化过程中木质素的降解；保护效果随 St/AA 浓度的增加而增加。处理过的木材在风化时水接触角的降低也比未处理的对照物慢。扫描电子显微镜显示 St/AA 聚合物填充了一些木材细胞腔，这有助于抑制水分和光（尤其是紫外线）渗透到木材中。在 12 个月的户外暴露期间，与未处理的对照相比，经过 St/AA 处理的木板含水量更低，早材细胞的脱落更少。St/AA 处理通过抑制细胞壁聚合物的光氧化和染色真菌的繁殖来稳定表面颜色。结果表明，用 St/AA 处理可以显着提高木材的耐候性。