NCC/NaClO氧化淀粉的制备及其对复合膜性能的影响

doi:10.3969/j.issn.0253-2417.2019.05.005

摘要/Abstract

摘要： 以玉米淀粉为原料，纳米微晶纤维素（NCC）/NaClO为氧化体系，探讨NaClO用量（以有效氯与绝干淀粉质量比计）对玉米淀粉氧化程度，以及氧化淀粉-聚乙烯醇/甘油（PVA/GL）共混复合膜性能的影响，分析表征了氧化淀粉的羧基含量、相对分子质量、表面形貌、晶体结构和复合膜的性能。研究结果表明：在NCC催化作用下，淀粉的氧化程度随NaClO用量的增加而提高，羧基含量在NaClO用量为10.0%时最高达到1.17%，比不添加NCC的NaClO氧化淀粉的羧基含量0.36%有明显提高；相比原淀粉，NaClO用量为8.0%时氧化淀粉的重均和数均相对分子质量分别降低了97.40%和97.27%。随着NaClO用量的增加，氧化过程使淀粉颗粒表面发生侵蚀且结晶度降低，但淀粉基复合膜的透明度提高（最高可达78.50%）；随着NaClO用量的增加，复合膜的耐水性逐渐提高，接触角逐渐增加，同时复合膜的透气度显著降低，拉伸应力逐渐提高而拉伸应变降低；当NaClO用量为10%时，复合膜的质量损失比为23.14%，15 s时接触角为101.0°，透气度为0.10 cm³/（cm²·s），拉伸应力为24.01 MPa，拉伸应变为2.14%，杨氏模量为1 452.25 MPa。

关键词: 玉米淀粉, 纳米微晶纤维素, NaClO, 氧化, 复合膜

Abstract: The effect of NaClO effective chlorine dosage on the performance of starch and the subsequent composite films was explored. The composite films were fabricated with oxidized starch, polyvinyl alcohol (PVA) and glycerol (GL), which corn starch was used as raw material and nanocrystalline cellulose (NCC)/NaClO was applied as oxidation system. The carboxyl content, molecular weight, surface morphology, crystal structure, and the performance of composite films of the oxidized starch were characterized. The results showed that the oxidation degree of starch increased with increasing NaClO effective chlorine dosage, and increased by 1.17% with 10.0%(Significantly improved comparing with 0.36% of the carboxyl content of NaClO oxidized starch without NCC) with the assistance of NCC; When the amount of NaClO is 8%, the M_w and M_n were 97.33% and 97.27% lower than that of native corn starch. The surface was eroded and crystallinity was reduced after oxidation of starch. However, the films'transparency was improved (The maximum transparency is up to 78.50%). The increasing oxidation degree of oxidized starch contributed to the good performance of the composite film with high water resistance and the increase of the contact angle as well as tensile strength, whereas led to the decrease of the air permeability and tensile strain. When the amount of NaClO is 10%, the mass loss ratio of the composite film is 23.14%, the contact angle is 101.0° in 15 s, the air permeability is 0.10 cm³/(cm²·s), the tensile stress is 24.01 MPa, tensile strain is 2.14% and Young's modulus is 1 452.25 MPa.

Key words: corn starch, nanocrystalline cellulose, NaClO, oxidation, composite film

中图分类号:

TQ35

戢德贤, 林兆云, 夏媛媛, 杨桂花, 陈嘉川. NCC/NaClO氧化淀粉的制备及其对复合膜性能的影响[J]. 林产化学与工业, 2019, 39(5): 33-40.

JI Dexian, LIN Zhaoyun, XIA Yuanyuan, YANG Guihua, CHEN Jiachuan. Preparation of NCC Assisted NaClO Oxidized Starch and Its Influence on the Properties ofComposite Film[J]. Chemistry and Industry of Forest Products, 2019, 39(5): 33-40.

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