Microfibrillated cellulose modified with urea and its reinforcement for starch-based bionanocomposites
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The aim of this study was to improve the dispersion of microfibrillated cellulose (MFC) in starch matrix. For this, a kind of urea-modified microfibrillated cellulose (U-MFC) was prepared with microwave-aided method from MFC and urea. The introduction of the carbamate group in MFC was confirmed by Fourier transform infrared spectroscopy and nitrogen content analysis. A better one of the modified fillers, 300 WU, was prepared under conditions of microwave power 300 W for 5 min, with the degree of substitution 0.14. Starch/nanocellulose biomass films were prepared by solution casting method. The results relating the properties showed that as the 300 WU content was 4 wt%, the tensile strength of starch/300 WU nanocomposite film increased by 88.3% and 37.4%, compared with the starch film without filler and with starch/MFC composite film with the same content, respectively. Also, the thermal stability of the composite increased slightly, and the transparency of the starch/nanocellulose composite film increased when the filler addition amount was 0.5%. In view of more evenly dispersed U-MFC in starch matrix observed with scanning electron microscope, the mechanism behind the performance improvement was speculated to be that the chemical modification increases the compatibility between MFC and starch matrix.
KeywordsBiomass films Carbamate cellulose Mcrofibrillated cellulose Starch Compatibility
We express our sincere thanks to the National Natural Science Foundation of China (No. 51603134) and the Graduate Program Construction Project Funding of Sichuan University (2017KCSJ036) for financial support.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Kim JH, Kim HR, Choi SJ, Park CS, Moon TW (2016) Production of an in vitro low-digestible starch via hydrothermal treatment of amylosucrase-modified normal and waxy rice starches and its structural properties. J Agric Food Chem 64:5045–5052. https://doi.org/10.1021/acs.jafc.6b01055 CrossRefGoogle Scholar
- Ling Z, Wang T, Makarem M, Cintrón, Cheng HN, Kang X, Bacher M, Potthast A, Rosenau T, King H, Delhom CD, Nam S, Edwards JV, Kim SH, Xu F, French AD (2019) Effects of ball milling on the structure of cotton cellulose. Cellulose 26:305–328. https://doi.org/10.1007/s10570-018-02230-x CrossRefGoogle Scholar
- Malmir S, Montero B, Rico M, Barral L, Bouza R (2016) Morphology, thermal and barrier properties of biodegradable films of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) containing cellulose nanocrystals. Compos Part A-Appl S 93:41–48. https://doi.org/10.1016/j.compositesa.2016.11.011 CrossRefGoogle Scholar
- Yin Y, Ma J, Tian X, Jiang X, Wang H, Gao W (2018) Cellulose nanocrystals functionalized with amino-silane and epoxy-poly(ethylene glycol) for reinforcement and flexibilization of poly(lactic acid): material preparation and compatibility mechanism. Cellulose 25:6447–6463. https://doi.org/10.1007/s10570-018-2033-7 CrossRefGoogle Scholar