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Cellulose and Pectic Polysaccharides

Cellulose and Pectic Polysaccharides

Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...

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Polyethylene cellulose nanofibrils nanocomposites.

Thiago Henrique Silveira Maia¹, Nelson Marcos Larocca¹, Cesar Augusto Gonçalves Beatrice¹

¹Universidade Federal de São Carlos, Departamento de Engenharia de Materiais, Rodovia Washington Luís, km 235, CEP 13565-905, São Carlos, SP, Brazil.

Carbohydrate Polymers

|July 23, 2017

Summary

This study explores using aqueous polyethylene dispersions to create cellulose nanofibril (CNF) nanocomposites. These materials show enhanced mechanical properties and good processability, offering a promising route for advanced nanocomposite development.

Keywords:

Cellulose nanofibrils Nanocomposite films Optical properties Polyethylene Rheology Tensile properties

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Published on: June 17, 2014

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Cellulose nanofibrils (CNF) offer remarkable properties but integrating them into polyolefins remains challenging.
Developing efficient and scalable methods for creating polyolefin-CNF nanocomposites is crucial for advanced material applications.

Purpose of the Study:

To investigate the efficacy of aqueous polyethylene copolymer dispersions as a compatibilizer for producing polyethylene-CNF nanocomposites.
To evaluate the impact of varying CNF content (1-90 wt%) on the properties and morphology of the resulting nanocomposite films.

Main Methods:

Preparation of polyethylene-CNF nanocomposite films using an aqueous dispersion method.
Characterization of films' appearance, optical, thermal, mechanical, and rheological properties.
Morphological analysis using Scanning Electron Microscopy (SEM).

Main Results:

Transparent PE/CNF films were achieved up to 20 wt% CNF, indicating good dispersion but non-uniform distribution.
Significant improvements in Young's modulus were observed, with increases of 100% (1 wt% CNF) and 15,900% (90 wt% CNF).
Rheological analysis confirmed good melt processability for the nanocomposites.

Conclusions:

Aqueous polyolefin dispersions provide a viable, efficient, and rapid method for synthesizing cellulose/polyolefin nanocomposites.
This approach facilitates the incorporation of low to high contents of cellulose nanofibrils into polyethylene matrices.
The developed nanocomposites exhibit enhanced mechanical performance and processability, suitable for various applications.