Chen Xuefeng, Zhong Lingqi, Gong Xiao
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, Hubei 430070, People's Republic of China.
Langmuir. 2024 May 14;40(19):10362-10373. doi: 10.1021/acs.langmuir.4c01077. Epub 2024 May 1.
Poly(l-lactic acid) (PLLA) featuring desirable biodegradability and biocompatibility has been recognized as one of the promising eco-friendly biomaterials. However, low crystallization and poor mechanical and chemical performances dramatically hamper its practical application. In this work, we report that functionalized cellulose/PLLA composite superhydrophobic stereocomplex films with controllable water adhesion and protein adsorption can be fabricated by a facile approach for the first time. First, cellulose is surface-modified by means of two silanization modification methods. Then, superhydrophobic cellulose/PLLA composite films are prepared through a solvent-evaporation-induced phase separation method. The two cellulose/PLLA composite films exhibit extreme water repellency but tunable water adhesion from sticky to slippery. The protein adsorption capacity of the cellulose/PLLA composite films can also be regulated. In addition, the stereocomplexation of the composite film provides excellent mechanical properties with an elongation at break of 22.36%, which is 237.8% higher than that of a pure PLLA film, which is more suitable for biomaterials. Furthermore, good biodegradability of the PLLA composite films in nature enables the bio-based composites as alternative materials to replace conventional petroleum-based polymers. The superhydrophobic films have also been demonstrated for many applications, including slippery surfaces, liquid transportation without loss, and antifouling.
聚左旋乳酸（PLLA）具有理想的生物可降解性和生物相容性，已被公认为是一种有前途的环保生物材料。然而，其低结晶度以及较差的机械和化学性能极大地阻碍了其实际应用。在本工作中，我们首次报道了可通过一种简便方法制备具有可控水附着力和蛋白质吸附能力的功能化纤维素/PLLA复合超疏水立构复合膜。首先，通过两种硅烷化改性方法对纤维素进行表面改性。然后，通过溶剂蒸发诱导相分离法制备超疏水纤维素/PLLA复合膜。这两种纤维素/PLLA复合膜表现出极强的疏水性，但水附着力可从粘性调节至滑性。纤维素/PLLA复合膜的蛋白质吸附能力也可以得到调控。此外，复合膜的立构复合作用提供了优异的机械性能，其断裂伸长率为22.36%，比纯PLLA膜高237.8%，更适合作为生物材料。此外，PLLA复合膜在自然环境中具有良好的生物可降解性，使得这种生物基复合材料能够作为替代材料来取代传统的石油基聚合物。这种超疏水膜还在许多应用中得到了验证，包括光滑表面、无损失的液体传输和防污。
