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03-07-2020 | Original Research | Issue 13/2020

Cellulose 13/2020

Cellulose nanocrystal reinforced poly(lactic acid) nanocomposites prepared by a solution precipitation approach

Journal:
Cellulose > Issue 13/2020
Authors:
Changxin Li, Ce Sun, Chengyu Wang, Haiyan Tan, Yanjun Xie, Yanhua Zhang
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The online version of this article (https://​doi.​org/​10.​1007/​s10570-020-03294-4) contains supplementary material, which is available to authorized users.

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Abstract

The difficulty of dispersing cellulose nanocrystals (CNCs) in poly(lactic acid) (PLA) was still a primary obstacle to enhance the properties of PLA nanocomposites. In this work, two different methods were used to modify CNCs that were then added dropwise and mixed with the PLA solution to conveniently obtain the composites. Transmission electron microscopy and Fourier transform infrared spectroscopy were used to characterize CNCs before and after modification. Ultraviolet–visible spectroscopy, tensile tests, differential scanning calorimetry, and thermogravimetric analysis were used to characterize the PLA nanocomposites. The results revealed that the CNCs that were modified with surfactant had better dispersion and thermal stability in the PLA nanocomposites. The Young’s modulus and strength of PLA/SCNC nanocomposites were significantly reinforced (up to 66.0% and 29.8%, respectively). Meanwhile, the transmittance remained above 60% in the visible range. The solution precipitation approach was effective and simple, which could be used with other polymers.

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