Ecofriendly UV-protective films based on poly(propylene carbonate) biocomposites filled with TiO2 decorated lignin

Abstract It is highly desirable to develop biodegradable UV-shielding materials from the renewable resources as the ever-increasing demand for the sustainable environment. In this work, TiO 2 decorated lignin particles (TiO 2 @lignin) were synthesized successfully by hydrothermal method in aqueous solution to improve the UV shielding performance of lignin particles. The poly(propylene carbonate) (PPC) composite films (thickness of ~23 μm) with different contents of TiO 2 @lignin were prepared via a blade-casting method. Morphological analysis showed that the TiO 2 @lignin dispersed uniformly in the PPC matrix with a good miscibility. UV–vis transmission spectra results revealed that the PPC composite film containing 5 wt% TiO 2 @lignin could absorb about 90% of UV light in the full UV band (200–400 nm), indicating the TiO 2 @lignin had a good UV-shielding property. Moreover, the presence of TiO 2 @lignin could significantly improve the thermal stability of the PPC/TiO 2 @lignin composite films. The DMA results showed that the introduction of TiO 2 @lignin could enhance the storage modulus and glass transition temperature simultaneously.