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Open AccessArticle

Effects of Ball Milling Processes on the Microstructure and Rheological Properties of Microcrystalline Cellulose as a Sustainable Polymer Additive

by Yu Zheng 1, Zongqiang Fu 2, Dong Li 1 and Min Wu 1,3,*
1
College of Engineering, China Agricultural University, No. 17 QinghuaEast Road, Haidian District, Beijing 100083, China
2
School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Haidian District, Beijing 100048, China
3
Engineering Research Center for Agricultural Equipment and Facilities, Ministry of Education, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1057; https://doi.org/10.3390/ma11071057
Received: 14 May 2018 / Revised: 9 June 2018 / Accepted: 19 June 2018 / Published: 22 June 2018
(This article belongs to the Special Issue Mechanical Characterization of Bio-Based Materials and Structures)
To investigate the effect of ball mill treatment of microcrystalline cellulose (MCC) on the rheological properties of MCC-polymer suspension, the structure and physicochemical characteristics of ground samples with different milling time and the rheological behaviors of MCC-starch suspensions were determined and comprehensively analyzed. During the ball milling process, MCC underwent a morphological transformation from rod-like to spherical shape under the combined effect of breakage and an agglomeration regime. The particle size and crystallinity index of MCC exhibited an exponential declining trend with ball milling time. All of the milled MCC samples presented a crystalline cellulose Iβ structure whereas the MCC mechanically treated in a shorter time had better thermal stability. Rheological measurements of starch/MCC suspensions indicated that all the blended paste exhibited shear thinning behavior and ‘weak’ elastic gel-like viscoelastic properties over the whole investigated range owing to the formation of entangled network structure. The rheological behavior of starch/MCC pastes was strongly dependent on milling time and concentration of MCC samples. The increase in milling time of MCC samples resulted in the loss of rheological properties of starch/MCC pastes, where the size of the MCC playing a dominant role in affecting the properties of composite suspension. In addition, a possible network within starch/MCC suspensions was proposed. View Full-Text
Keywords: microcrystalline cellulose; ball milling; physicochemical properties; starch; rheological properties microcrystalline cellulose; ball milling; physicochemical properties; starch; rheological properties
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Zheng, Y.; Fu, Z.; Li, D.; Wu, M. Effects of Ball Milling Processes on the Microstructure and Rheological Properties of Microcrystalline Cellulose as a Sustainable Polymer Additive. Materials 2018, 11, 1057.

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