半纤维素-甲基纤维素复合膜的制备及其性能分析

将甲基纤维素和山梨醇分别添加到半纤维素中制备半纤维素-甲基纤维素复合膜及半纤维素-山梨醇复合膜，对复合膜的成膜性和强度性能进行分析，并探讨半纤维素-甲基纤维素及半纤维素-山梨醇混合溶液的粒径和Zeta电位。结果表明，随着甲基纤维素质量分数增加，半纤维素-甲基纤维素混合溶液粒径先增大后减小；Zeta电位则随着甲基纤维素质量分数的增加先降低后提高，甲基纤维素质量分数为75%时，半纤维素-甲基纤维素混合溶液的Zeta电位达到最小值。当甲基纤维素质量分数为35%时，可形成完整的半纤维素-甲基纤维素复合膜，增加甲基纤维素质量分数，复合膜强度提高；当甲基纤维素质量分数为75%时，复合膜强度最大，但继续增加甲基纤维素的质量分数，复合膜强度降低。山梨醇质量分数为35%～50%时，可形成完整的半纤维素-山梨醇复合膜，且随着山梨醇质量分数增加，复合膜强度降低。

Study on the Properties of Composite Film Prepared from Hemicelluloses and Methylcellulose

To improve the film-forming property of hemicellulose, the methylcellulose and sorbitol were added respectively to form composite films and the film-forming and strength property were investigated. The particle size and Zeta potential of the hemicelluloses-methylcellulose and hemicellulose-sorbitol mixed solution were also investigated. The results showed that with the increase of methylcellulose dosage, the size of hemicelluloses-methylcellulose mixed solution particles increased first then reduced and the Zeta potential reduced first then increased. When the methylcellulose dosage was 75%, the Zeta potential reached the minimum. The continuous hemicellulose-methylcellulose film was formed when the methylcellulose addition was at least 35%. The hemicellulose-sorbitol film was continuous when the sorbitol addition ranged from 35% to 50%. The strength property of hemicellulose-sorbitol composite film decreased with the increase of sorbitol content. The strength property of hemicelluloses-methylcellulose composite film improved with the increases of methylcellulose and reached a maximum value when the methylcellulose dosage was 75%, however the strength property of the composite film decreased as the methylcellulose dosage was higher than this value.