| 摘要: |
| 目的 研究利用机械法处理废弃滤纸浆制备功能性包装复合材料的可行性。方法 采用研磨和高压均质的方法， 分别从未处理和乙酸预处理废弃滤纸浆中分离出 2 种不同尺寸的纤维素纳米纤丝（CNFs）， 悬浮液抽滤成膜， 并采用浸渍法制备2种CNFs/PVA复合膜， 对其力学性能和透光率进行测试。结果 通过场发射扫描电镜 （SEM） 观察， 未处理滤纸浆的纤维素纤丝直径分布在300~500 nm之间，乙酸预处理后纤丝直径明显减小， 主要分布在60~100 nm之间。乙酸预处理滤纸CNFs/PVA复合膜具有较好的力学性能和透明性， 其中拉伸强度高达90.45 MPa， 较PVA提高了201%， 透光率为81.3%， 较PVA降低10.3%。结论 对2种方法制备的CNFs/PVA复合材料性能比较表明， 经乙酸预处理后的滤纸CNFs膜性能明显提高， 其对PVA的增强效果更佳， 可以作为高强度、 高透明包装材料使用。 |
| 关键词: 废弃滤纸纳米纤维素 乙酸预处理 聚乙烯醇 拉伸强度 透光率 |
| DOI： |
| 分类号:TB484.6 |
| 基金项目: |
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| Preparation of Disused Filter Paper Cellulose Nanofibers-reinforced PVA Composites |
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WANG Bao-xia1,2, LI Da-gang3
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1. Anhui Agriculture University， Hefei 230036， China;2. Nanjing Forestry University， Nanjing 210037， China;3.Nanjing Forestry University， Nanjing 210037， China
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| Abstract: |
| To study the feasibility of preparing functional packaging composite from disused filter paper pulp by mechanical means. Mechanical methods including grinding and homogenization were used to separate 2 types of cellulose nanofibers (CNFs) in different sizes from the untreated and acetic acid-pretreated disused filter paper pulp. The water suspension of well-dispersed CNFs was filtered and then oven-dried to prepare films. Two types of CNFs-reinforced Polyvinyl Alcohol (PVA) composites were prepared by impregnation method, and their mechanical properties and transmittance were tested. The FE-SEM images showed that the diameter of CNFs from untreated pulp was distributed in the range of 300～500 nm, while that from acetic acid-pretreated pulp was significantly reduced to 80～100 nm. Compared with PVA sheet, the tensile strength (90.45 MPa) and the light transmittance (81.3%) of the acetic acid-pretreated CNFs/PVA composites were respectively raised by 201% and decreased by 10.3%. The result revealed that the addition of CNFs enhanced the mechanical properties of PVA, and that acetic acid-pretreated CNFs had better effects, which could be used as high-strength and highly transparent packaging materials. |
| Key words: disused filter paper CNFs acetic acid pretreatment PVA tensile strength light transmittance |
