Effects of bentonite on physical, mechanical and barrier properties of cellulose nanofibril hybrid films for packaging applications
Effects of bentonite on physical, mechanical and barrier properties of cellulose nanofibril hybrid films for packaging applications
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膨润土对包装用纤维素纳米原纤杂化薄膜的物理、机械和阻隔性能的影响
DOI：
10.1007/s10570-019-02473-2
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发表时间：
2019
期刊：
影响因子：
5.7
通讯作者：
N. Stark
中科院分区：
文献类型：
--
作者：
M. Zheng;M. Tajvidi;A. H. Tayeb;N. Stark
纤维素纳米原纤（CNF）由于其丰富、生物降解性和低透气性而越来越受到关注。在这项工作中，氧气和水的阻隔性能进行了研究，生物纳米复合膜的两种类型的膨润土（PGN和PGV）在不同的负载量（15，30和45重量%），连续CNF矩阵纳入形成。所得的混合膜进行了分析，它们的形态，表面能，机械强度，以及水/氧阻隔质量。这两种类型的膨润土降低CNF的降解温度和强度在一定程度上的原因不那么清楚，但可能是由于部分破坏的CNF H-键网络。微观研究表明，粘土颗粒在纤维素链中形成一层，从而改变了复合材料的结构。极性和非极性液体的接触角分析表明，含有PGN的样品更具亲水性;粘土在复合材料中引入了极性官能度。虽然15%PGN负荷将水蒸气透过率从425 g/m2天降低到375 g/m2天，但较高比例的膨润土对这一趋势产生负面影响。透氧率分析表明，在干燥状态下，PGN有效地限制了氧气通道，在较高的相对湿度下，PGN的限制程度较低。在WVTR分析中，PGN显示出优于PGV的上级性能，这归因于其晶体结构，如XRD图中所示。在这项研究中提出的混合CNF-BNT薄膜可以在包装材料中提供生态友好的替代品，特别是在避免水蒸气和氧气渗透的情况下。图形摘要
There is an increasing attention to cellulose nanofibrils (CNFs) for food packaging applications due to their abundance, biodegradability, and low gas permeability. In this work, oxygen and water barrier performance is studied for bio-nanocomposite films formed by incorporation of two types of bentonite (PGN and PGV) at different loads (15, 30 and 45 wt%) into continuous CNF matrix. The resulting hybrid films were analyzed for their morphology, surface energy, mechanical strengths as well as water/oxygen barrier qualities. Both types of bentonite lowered the CNF degradation temperature and strength to some degree for reasons not so clear but perhaps due to partial disruption of the CNF H-bond network. It was revealed from microscopic study that clay particles form a layer within cellulose chains, resulting in alteration of composite structure. The contact angle analysis by polar and nonpolar liquids, suggested the PGN-containing samples were more hydrophilic; clay induced polar functionalities to the composite. While 15% PGN load reduced the water vapor transmission rate from 425 to 375 g/m2 day, higher proportions of bentonite negatively affected this trend. Also, analysis of oxygen transmission rate showed the PGN effectively restricted the oxygen passage in dry state and to a lower extent at higher relative humidity. In WVTR analysis, PGN showed a superior performance over PGV attributable to its crystalline structure as evident in XRD patterns. The proposed hybrid CNF-BNT films in this study can present an eco-friendly alternative in packaging materials, especially where penetration of water vapor and oxygen is to be avoided.Graphical abstract
影响因子：
3.4
作者：
Noonan, Colin;Tajvidi, Mehdi;Tabatabaie, Seyed Ehsan
通讯作者：
Tabatabaie, Seyed Ehsan