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Preparation of formyl cellulose and its enhancement effect on the mechanical and barrier properties of polylactic acid films.

Abstract：

:Cellulose was modified by formic acid to prepare formyl cellulose (FC). The amount of formyl groups in FC was adjusted by controlling the reaction time, reaction temperature, and formic acid concentration. Then, FC was used to reinforce polylactic acid (PLA) films prepared by solution casting. Scanning electron microscopy (SEM) shows that long rod-like cellulose particles were broken into short rods after formylation and the introduction of FC made PLA surface rougher. The mechanical properties of PLA/FC films were improved by the inclusion of FC. Compared to pure PLA film, the PLA/FC composite film with 1 wt% FC (containing 15.79% formyl groups) showed a 48.59% increase in tensile strength and a 346% increase in Young's modulus. The addition of FC also resulted in better water barrier properties. The moisture absorption capacity and water vapor permeability were 40.56% and 51.43% lower than those of the pure-PLA film. The enhancement in properties for PLA/FC composites could be ascribed to the improved compatibility between PLA and cellulose with the introduction of hydrophobic formate groups. The PLA/FC composite films developed in this work could be highly potential for food packaging.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Long S,Zhong L,Lin X,Chang X,Wu F,Wu R,Xie F

doi

10.1016/j.ijbiomac.2021.01.029

subject

Has Abstract

pub_date

2021-01-09 00:00:00

pages

82-92

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(21)00048-9

journal_volume

172

pub_type

杂志文章

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