Effects of modified cellulose nanocrystals on the barrier and migration properties of PLA nano-biocomposites

被引：370

作者：

Fortunati, E. ^{[1
]}

Peltzer, M. ^{[3
]}

Armentano, I. ^{[1
]}

Torre, L. ^{[1
]}

Jimenez, A. ^{[3
]}

Kenny, J. M. ^{[1
,2
]}

机构：

[1] Univ Perugia, Mat Engn Ctr, UdR INSTM, I-06100 Perugia, Italy

[2] CSIC, Inst Polymer Sci & Technol, Madrid, Spain

[3] Univ Alicante, Dept Analyt Chem Nutr & Food Sci, E-03080 Alicante, Spain

来源：

CARBOHYDRATE POLYMERS | 2012年 / 90卷 / 02期

关键词：

Nano-biocomposites; Poly(lactic acid); Cellulose nanocrystals; Barrier properties; Overall migration; MULTIPLE MELTING BEHAVIOR; POLY(LACTIC ACID); LACTIC-ACID; POLY(L-LACTIC ACID); CRYSTAL-STRUCTURE; CONFORMATION; NANOWHISKERS; MORPHOLOGY; WHISKERS; SPUN;

D O I：

10.1016/j.carbpol.2012.06.025

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The aim of this paper is to report the impact of the addition of cellulose nanocrystals on the barrier properties and on the migration behaviour of poly(lactic acid), PLA, based nano-biocomposites prepared by the solvent casting method. Their microstructure, crystallinity, barrier and overall migration properties were investigated. Pristine (CNC) and surfactant-modified cellulose nanocrystals (s-CNC) were used, and the effect of the cellulose modification and content in the nano-biocomposites was investigated. The presence of surfactant on the nanocrystal surface favours the dispersion of CNC in the PLA matrix. Electron microscopy analysis shows the good dispersion of s-CNC in the nanoscale with well-defined single crystals indicating that the surfactant allowed a better interaction between the cellulose structures and the PLA matrix. Reductions of 34% in water permeability were obtained for the cast films containing 1 wt.% of s-CNC while good oxygen barrier properties were detected for nano-biocomposites with both 1 wt.% and 5 wt.% of modified and un-modified cellulose nanocrystals, underlining the improvement provided by cellulose on the PLA films. Moreover, the migration level of the studied nano-biocomposites was below the overall migration limits required by the current normative for food packaging materials in both non-polar and polar simulants. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：948 / 956

页数：9

共 39 条

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