油茶果壳中纳米纤维素的分离与成膜性能研究

Structural and properties of cellulose nanocrystals isolated from the fruit shell of Camellia oleifera Abel

摘要:

以茶籽油生产过程中的废弃物——油茶果壳为研究对象，首先采用亚硫酸盐预蒸煮实现纤维素和木素、半纤维素等组分的分离，然后经酸水解得到油茶果壳纳米纤维素，最后压滤制备高强度透明薄膜。实验结果表明从油茶果壳中提取分离得到的纳米纤维素呈棒状，直径为6-10 nm，长度为300-500 nm，属于纤维素I型，结晶度为72 %，热分解温度为230 ℃；压滤制备得到的纳米纤维素薄膜，具有良好的透光度和拉伸强度，可用于制备高强度透明食品薄膜包装材料。

Abstract:

Cellulose nanocrystals (CNC) with high aspect ratio of 50 have been readily prepared from the inexpensive fruit shell of Camellia oleifera Abel (SCOA) for the first time. In this study, SOCA was consecutively subjected to sulfite pulping and acid hydrolysis to remove non-cellulosic components，release CNC and prepare highly transparent film. The derived CNC possesses a needle-shaped structure that in average diameter and length of 8 ± 2 nm and 400 ± 100 nm, respectively. The crystallinity index of CNC increased to 72% and the initial decomposition temperature raised to 230 °C. The obtained CNC was formed to nanopaper by vacuum filtration showing high visible light transmittance over 80 % and high strength. Thus SOCA derived CNC is of great practical potential to apply in the field of food packaging.