bioplastics-2016_posters-accepted-abstracts

Page 74

Bioplastics 2016

November 10-11, 2016

Volume 7 Issue 6(Suppl)

J Bioremediat Biodegrad

ISSN: 2155-6199 JBRBD, an open access journal

conferenceseries

.com

November 10-11, 2016 Alicante, Spain

International Conference on

Sustainable Bioplastics

J Bioremediat Biodegrad 2016, 7:6(Suppl)

What makes cellulose auxetic?

Akwasi Asamoah

Formerly of the University of Exeter, UK

he 1D bundles of cellulose microfibrils (lignified flax fiber) and 2D networks of cellulose microfibrils form tunicate,

bacterial and microfibrillated celluloses were strained in tension, and their molecular deformation followed by Raman

spectroscopy in order to fully understand the origins and magnitudes of in-plane auxetics for the information of innovation.

Cellulose is found to exhibit three distinct yielding. Both crystalline and amorphous cellulose are found to be auxetic so long

as intermolecular hydrogen bonding remains intact. Auxetics of crystalline cellulose is found to be around unity (-1) while

that of cellulose amorphous is found to be around twice (-2) that of crystalline cellulose with the possibility of 1D bundles of

cellulose microfibrils registering auxetics higher than -7 in the absence of lignin. Though 2D networks of cellulose microfibrils

enhance strain to failure, they also significantly limit auxetics of single 1D cellulose microfibrils in networks. Differences in

auxetics between crystals and amorphous must predominantly arise from differences in intermolecular geometry. Similarity

of in-plane auxetics of cellulose to the off-axis auxetics of zeolites (especially thomsonite zeolites) indicates the possibility of

combining both semi-crystalline materials to produce functionalized composites with photo-electromechanical properties.

Soy-based bio-nanocomposites: Evaluation of the processing conditions and nanoclay incorporation

Alberto Romero, Manuel Felix, Víctor Perez-Puyana and Antonio Guerrero

University of Seville, Spain

io-based plastics are composed by a biopolymer matrix, a plasticizer and some additives to improve the processability or

properties of the final product, like nanoclay which is used to increase the water uptake of these biomaterials. For that

reason, the overall objective of this work is to clarify the influence of nanoclay content (montmorillonite) in the mechanical and

physicochemical properties of bio-nanocomposites obtained from soy protein. These materials were prepared by means of two

different processes: an injection moulding process and an extrusion process, using in both cases soy protein (SPI) and natural

montmorillonite (MMT-Na

), being the nanoclay concentration and the processing conditions critical parameters to take into

account. Thus, several systems were obtained and evaluated, containing from 0 to 9 wt. % of MMT. Bioplastics’ mechanical

characterization is performed by dynamic mechanical thermal analysis (DMTA) using a RSA3 rheometer and tensile tests by

an electromechanical testing system. X-rays diffraction, confocal laser scanning microscopy (CLSM) and SEM were assessed

to analyze the nanoclay incorporation into the material, as well as their structure. Moreover, water uptake capacity is an

interesting barrel property which has also been evaluated. An increase in nanoclay content tends to create laminar structure,

being this change in structure involved in remarkable changes in mechanical properties as well as in water uptake capacity (the

presence of nanoparticles in the protein matrix can improve water uptake).