不同原料NCC对NCC/PVA复合膜性能的影响

Effect of different materials NCC on performance of NCC/PVA composite membrane

分别以微晶纤维素、脱脂棉和漂白芦苇浆为原料,硫酸水解法制备纳米纤维素(NCC),与聚乙烯醇(PVA)简单共混流延成膜法制备NCC/PVA复合膜。m(NCC)/m总为7%时制备NCC/PVA复合膜,红外光谱分析结果表明复合膜中PVA分子链和NCC分子链间存在能提高两者相容性的氢键缔合作用力;热重分析结果表明复合膜的热稳定性与NCC热稳定性基本一致。扫描电子显微镜分析结果表明m(NCC)/m总为0.5%时制备NCC/PVA复合膜的表面和断面较为规整。3种原料中漂白芦苇浆NCC长径比最高(约为25),且m(NCC)/m总为0.5%时制备NCC/PVA复合膜拉伸强度最大,较PVA膜拉伸强度提高40.8%。3种原料NCC分别制备的3种NCC/PVA复合膜断裂伸长率,均较PVA膜断裂伸长率降低。随着m(NCC)/m总的增加,NCC/PVA复合膜透光率较PVA膜透光率降低;3种原料中微晶纤维素NCC/PVA复合膜透光率较PVA膜透光率降低最小。

Nanocrystalline cellulose（NCC）was separately prepared by sulfuric acid hydrolysis method from microcrystalline cellulose, absorbent cotton and bleached reed pulp. With polyvinyl alcohol（PVA）, NC/PVA composite membrane was prepared by membrane forming method of simple francis extension. NCC/PVA composite membrane was prepared with 7% of m（NCC）, fourier transform irdrared（FTIR）analysis results showed that compatibility of the membrane was improved by hydrogen bonding association force between PVA molecular chain and NCX3 molecular chain. Thermogravimetric analysis（TGA）results showed that thermal stability of the membrane was basically the same with that of NCC. Scanning electron microscopy（SEM）results showed that the surface and cross-section of NCC/PVA membrane prepared with 0. 50%of m（NCC） were more regular respectively. The length-diameter ratio of bleached reed pulp NCC was the highest in three materials NCC（about 25）, and the tensile strength of NCC/PVA membrane prepared with 0. 5% of m（NCC）/ was the largest and increased 40. 8% compared with that of PVA membran The dongation at break of NCC/PVA membrane prepared with three materials NCC was decreased compared with that of PVA membran Transmittance of NCC/PVA membrane was decreased with increaseing m（NCC）compared with that of PVA membrane Transmittance of microcrystalline cellulose NCC/PVA membrane was decreased to the minimum in three materials NCC compared with that of PVA membrane.