Properties of poly (l-lactic acid) reinforced by l-lactic acid grafted nanocellulose crystal

In this research, nanocellulose crystal (NCC) grafted with lactic acid (LA) oligomer was synthesized by one-pot method and used to reinforce the poly(l-lactic acid) (PLLA) matrix. FT-IR, XRD, and 13C NMR were used to analyze the structure of modified nanocellulose crystal (g-NCC). The results of GPC...

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Bibliographic Details
Published in:International journal of biological macromolecules 2020-08, Vol.156, p.314-320
Main Authors: Wang, Kaili, Lu, Jianxiao, Tusiime, Rogers, Yang, Yun, Fan, Fan, Zhang, Hui, Ma, Bomou
Format: Article
Language:English
Subjects:
Biocompatible Materials - chemistry
Cellulose - chemistry
Crystallization
Graft modification
Lactic Acid - chemistry
Mechanical Phenomena
Models, Molecular
Molecular Conformation
Nanocellulose crystal
Nanoparticles - chemistry
Nanoparticles - ultrastructure
Poly (lactic acid)
Polyesters - chemistry
Spectroscopy, Fourier Transform Infrared
Thermogravimetry
X-Ray Diffraction
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Summary:In this research, nanocellulose crystal (NCC) grafted with lactic acid (LA) oligomer was synthesized by one-pot method and used to reinforce the poly(l-lactic acid) (PLLA) matrix. FT-IR, XRD, and 13C NMR were used to analyze the structure of modified nanocellulose crystal (g-NCC). The results of GPC suggested that the degree of polymerization of the grafted segments was 23, and the degree of hydroxyl substitution of g-NCC was 2.4%. For the g-NCC/PLLA composite, its crystallization rate increases significantly compared with pure PLLA, indicating that g-NCC acted as a nucleating agent to promote the crystallization. Moreover, tensile strength of the composite materials was significantly improved from 41.9 MPa to 53.9 MPa due to the enhanced compatibility. This study provides a fast and effective modification method for g-NCC/PLLA biodegradable composites. According to the above-mentioned experimental results, the g-NCC/PLLA composites can be considered as a potential material in the packaging field, mainly due to its proper biological and physicochemical properties. •Nanocellulose crystal was modified with lactic acid by one-pot method.•The degree of polymerization of the grafted segments is 23, and the degree of hydroxyl substitution of g-NCC is 2.4%.•Tensile strength of G-NCC/PLLA has been improved from 41.9 MPa to 53.9 MPa.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2020.04.025