| 细菌纤维素-ZnO/水性聚氨酯复合薄膜的制备与性能 |
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| 引用本文： | 吴景,曾威,邝美霞,钟成. 细菌纤维素-ZnO/水性聚氨酯复合薄膜的制备与性能[J]. 复合材料学报, 2020, 37(12): 3026-3034. DOI: 10.13801/j.cnki.fhclxb.20200407.001 |
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| 作者姓名： | 吴景 曾威 邝美霞 钟成 |
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| 作者单位： | 1.天津科技大学 化工与材料学院，天津 300457 |
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| 基金项目： | 天津市自然科学基金（19PTSYJC00060；19JCZDJC34700） |
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| 摘 要： | 以细菌纤维素(BC)为模板，以ZnSO4、NaOH和尿素为原料，通过水热法制备了具有新型刷状结构的细菌纤维素-ZnO(BC-ZnO)复合颗粒，尺寸约为3~5 μm，其中BC含量约为19wt%，并对其可能的形成机制进行阐述。将不同含量的BC-ZnO复合颗粒通过原位聚合法引入到水性聚氨酯(WPU)中得到细菌纤维素-ZnO/水性聚氨酯(BC-ZnO/WPU)复合薄膜，对复合膜的结构与性能进行了表征。结果表明:复合颗粒在WPU中分散良好；复合膜的拉伸强度在BC-ZnO含量为1.0wt%时达到最高，相较于纯WPU提高了84.6%；吸水率从16.5%降到4.9%；BC-ZnO的引入提高了复合膜的初始热稳定性；复合膜具有良好的抗菌性，当BC-ZnO含量为1.3wt%时，对金黄色葡萄球菌的抗菌率超过99%，对大肠杆菌的抗菌率超过85%。
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| 关 键 词： | 细菌纤维素 ZnO 水性聚氨酯 复合材料 改性 |
| 收稿时间： | 2020-02-04 |
Preparation and properties of bacterial cellulose-ZnO/waterborne polyurethane composite films |
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| Affiliation: | 1.College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China2.State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China |
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| Abstract: | Bacterial cellulose-ZnO (BC-ZnO) composite particles were prepared through the hydrothermal synthesis method using BC as a template, using Zinc sulfate、NaOH and urea as raw materials. The results show that BC-ZnO composite particles are the novel brush-like structure with a size of 3-5 μm. BC filaments are wrapped in brush-like ZnO at a level of approximate 19wt%. The formation mechanism of the brush-like structure of the composite particles is explained. Bacteria cellulose-ZnO/waterborne polyurethane (BC-ZnO/WPU) composite film was obtained by introducing different contents of BC-ZnO composite particles into waterborne polyurethane by in-situ polymerization method, and the structure and performance of the composite film were characterized. SEM shows that composite particles are well dispersed in polyurethane. The properties reach the optimal when the proportion of BC-ZnO is 1.0wt%, the tensile strength is 84.6% higher than that of pure WPU; the water absorption is deceased from 16.5% to 4.9%; the addition of BC-ZnO improves the initial thermal stability of the composite film; the composite film shows good antibacterial properties. When the BC-ZnO content is 1.3wt%, the antibacterial rate against S. aureus exceeds 99% and the antibacterial rate against E. coli exceeds 85%. |
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