羧甲基纤维素增强膜的制备及性能

目的为了获得一种可用于食品包装的羧甲基纤维素增强膜。方法以羧甲基纤维素(CMC)为成膜基底,甘油为增塑剂,分别将质量分数为1%,3%,5%和10%的纳米纤维素(NCC)添加到CMC中,共混流延制备羧甲基纤维素增强膜(CMC-NCC)。结果 NCC的加入,提高了CMC的力学性能和对水蒸气的阻隔性能,还提高了CMC的热性能。FT-IR分析结果表明,CMC与NCC两者间形成了分子间氢键;XRD分析结果表明,NCC可以改变CMC的结晶排列。当添加质量分数为5%的NCC时,CMC-NCC的拉伸强度比纯CMC膜提高了25.6%,断裂伸长率降低了21.3%,透湿量降低了9%,热稳定性提高了2%,透光率维持在87%以上。结论 CMC增强膜具有力学性能高、阻湿性能好等优点,NCC提高了CMC的成膜品质。

Preparation and Properties of Reinforced Carboxymethyl Cellulose Films

The work aims to obtain the reinforced carboxymethyl cellulose films (CMC-NCC) for food packaging. With the carboxymethyl cellulose as the formed film base and the glycerol as the plasticizer, NCCs of 1%, 3%, 5% and 10% mass fraction were added into CMC by solution casting and then the CMC-NCC was prepared. The mechanical, moisture barrier and thermal properties of CMC were improved by incorporating the NCC. FT-IR analysis results proved that the intermolecular hydrogen bond was formed between CMC and NCC. XRD analysis results proved that NCC could change the crystallization arrangement of CMC. With the addition of 5% NCC, the tensile strength was increased by 25.6%, the elongation at break was decreased by 21.3%, the water vapor permeability was decreased by 9%, the thermal stability was improved by 2% and the light transmittance remained above 87%, compared to the pure CMC films. In conclusion, the reinforced CMC film is featured by high mechanical property, good moisture barrier property and other advantages, and NCC has improved the quality of the formed CMC films.