UV absorption coating is an important function material, which can protect the substrates from photoaging. In this work, a class of sustainable UV-absorbent copolymers derived from ethyl cellulose (EC), fatty acid and rosin were prepared by a combination of atom transfer radical polymerization (ATRP) and click chemistry. To fulfill this strategy, the pendant azides were first attached onto the backbone of EC. Then, ATRP was applied to fabricate well-defined poly(lauryl methacrylate) (PLMA) bearing terminal alkynes. Finally, click chemistry between the pendant azides in EC and the alkynes in PLMA as well as in rosin esters (DAPE), was performed to achieve the cellulose-rosin graft copolymers (EC-(g-DAPE)-g-PLMA) with UV absorption property. The chemical structure of cellulose-rosin graft copolymers was confirmed by FTIR, ¹H NMR and GPC. Thermodynamic performance analysis indicated that these EC-rosin graft copolymers showed better thermal stability than EC. Due to the synergistic hydrophobic interaction of rosin and the hydrophobic lauryl groups in PLMA, these graft copolymers showed excellent hydrophobic property, and the static contact angles were all above 90°. In addition, all the EC-rosin graft copolymers showed outstanding and stable UV absorption capability, and maintained excellent UV absorption capability after continuous UV-irradiation for 1 h or being heated to 100 °C for 0.5 h, which had potential application in UV absorption materials.

紫外线吸收涂层是一种重要的功能材料，可以保护基材免受光老化。在这项工作中，通过原子转移自由基聚合（ATRP）和点击化学的结合，制备了一种衍生自乙基纤维素（EC），脂肪酸和松香的可持续吸收紫外线的共聚物。为了实现这一策略，首先将叠氮化物悬挂在EC的骨架上。然后，使用ATRP来制造定义明确的带有末端炔烃的聚（甲基丙烯酸十二烷基酯）（PLMA）。最后，在EC中的悬垂叠氮化物与PLMA中的炔烃以及松香酯（DAPE）之间进行点击化学反应，以制得纤维素-松香接枝共聚物（EC-（g -DAPE）-g-PLMA）具有紫外线吸收特性。FTIR，¹ H NMR和GPC证实了纤维素-松香接枝共聚物的化学结构。热力学性能分析表明，这些EC-松香接枝共聚物显示出比EC更好的热稳定性。由于松香与PLMA中的疏水性月桂基基团协同疏水相互作用，这些接枝共聚物表现出优异的疏水性，并且静态接触角均大于90°。此外，所有的EC-松香接枝共聚物均表现出出色且稳定的紫外线吸收能力，并且在连续紫外线照射1 h或加热至100°C持续0.5 h后仍保持优异的紫外线吸收能力，这在紫外线吸收方面具有潜在的应用价值。材料。