Yue Tianqi, Wang Huanbo, Fu Yuan, Guo Shiyu, Zhang Xuefeng, Liu Tian
Key Laboratory of Bio-Based Material Science & Technology, Northeast Forestry University, Ministry of Education, 26 Hexing Road, Harbin 150040, China.
Polymers (Basel). 2022 Apr 5;14(7):1479. doi: 10.3390/polym14071479.
In this work, titanium dioxide (TiO2)-incorporated rice straw fiber (RS)/poly(butylene succinate) (PBS) biocomposites were prepared by injection molding with different TiO2 powder loadings. The RS/PBS with 1 wt% TiO2 demonstrated the best mechanical properties, where the flexural strength and modulus increased by 30.34% and 28.39%, respectively, compared with RS/PBS. The non-isothermal crystallization of neat PBS, RS/PBS composites, and titanium-dioxide-incorporated RS/PBS composites was investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The non-isothermal crystallization data were analyzed using several theoretical models. The Avrami and Mo kinetic models described the non-isothermal crystallization behavior of neat PBS and the composites; however, the Ozawa model was inapplicable. The crystallization temperature (Tc), half-time of crystallization (t1/2), and kinetic parameters (FT) showed that the crystallizability followed the order: TiO2-incorporated RS/PBS composites > RS/PBS > PBS. The RS/PBS with 1 wt% TiO2 showed the best crystallization properties. The Friedman model was used to evaluate the effective activation energy of the non-isothermal crystallization of PBS and its composites. Rice straw fiber and TiO2 acted as nucleating agents for PBS. The XRD results showed that the addition of rice straw fiber and TiO2 did not substantially affect the crystal parameters of the PBS matrix. Overall, this study shows that RS and TiO2 can significantly improve the crystallization and mechanical properties of PBS composites.
在本研究中，通过注塑成型制备了不同二氧化钛（TiO₂）粉末含量的二氧化钛（TiO₂）掺杂稻草纤维（RS）/聚丁二酸丁二醇酯（PBS）生物复合材料。含1 wt% TiO₂的RS/PBS表现出最佳的力学性能，与RS/PBS相比，其弯曲强度和模量分别提高了30.34%和28.39%。采用差示扫描量热法（DSC）和X射线衍射（XRD）研究了纯PBS、RS/PBS复合材料以及二氧化钛掺杂RS/PBS复合材料的非等温结晶行为。使用几种理论模型分析了非等温结晶数据。Avrami和Mo动力学模型描述了纯PBS及其复合材料的非等温结晶行为；然而，Ozawa模型并不适用。结晶温度（Tc）、结晶半衰期（t1/2）和动力学参数（FT）表明，结晶能力顺序为：二氧化钛掺杂RS/PBS复合材料＞RS/PBS＞PBS。含1 wt% TiO₂的RS/PBS表现出最佳的结晶性能。Friedman模型用于评估PBS及其复合材料非等温结晶的有效活化能。稻草纤维和TiO₂作为PBS的成核剂。XRD结果表明，稻草纤维和TiO₂的添加对PBS基体的晶体参数没有显著影响。总体而言，本研究表明RS和TiO₂可显著改善PBS复合材料的结晶和力学性能。
