Creep behavior of starch-based nanocomposite films with cellulose nanofibrils

Meng Li; Dong Li; Li-Jun Wang; Benu Adhikari

doi:10.1016/j.carbpol.2014.10.023

Creep behavior of starch-based nanocomposite films with cellulose nanofibrils

Carbohydr Polym. 2015 Mar 6:117:957-963. doi: 10.1016/j.carbpol.2014.10.023. Epub 2014 Oct 22.

Authors

Meng Li¹, Dong Li², Li-Jun Wang³, Benu Adhikari⁴

Affiliations

¹ College of Engineering, National Energy R & D Center for Non-food Biomass, China Agricultural University, P. O. Box 50, 17 Qinghua Donglu, Beijing 100083, China.
² College of Engineering, National Energy R & D Center for Non-food Biomass, China Agricultural University, P. O. Box 50, 17 Qinghua Donglu, Beijing 100083, China. Electronic address: dongli@cau.edu.cn.
³ College of Food Science and Nutritional Engineering, Beijing Key Laboratory of Functional Food from Plant Resources, China Agricultural University, Beijing, China. Electronic address: wlj@cau.edu.cn.
⁴ School of Applied Sciences, RMIT University, City Campus, Melbourne, VIC 3001, Australia.

PMID: 25498722
DOI: 10.1016/j.carbpol.2014.10.023

Abstract

Nanocomposite films were successfully prepared by incorporating cellulose nanofibrils (CNFs) from sugar beet pulp into plasticized starch (PS) at CNFs concentration of 5-20%. The storage (G') and loss (G″) moduli, creep and creep-recovery behavior of these films were studied. The creep behavior of these films at long time frame was studied using time-temperature superposition (TTS). The CNFs were uniformly distributed within these films up to 15% of CNFs. The PS-only and the PS/CNFs nanocomposite films exhibited dominant elastic behavior. The incorporation of CNFs increased both the G' and G″. The CNFs improved the creep resistance and reduced the creep recovery rate of the PS/CNFs nanocomposite films. TTS method was successfully used to predict the creep behavior of these films at longer time frame. Power law and Burgers model were capable (R(2)>0.98) of fitting experimental G' versus angular frequency and creep strain versus time data, respectively.

Keywords: Cellulose nanofibrils; Composite films; Creep behavior; Frequency sweep; Time-temperature superposition (TTS).

Publication types

Research Support, Non-U.S. Gov't