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Polymer Chemistry 2018

Polymer Sciences

ISSN: 2471-9935

Page 66

March 26-28, 2018

Vienna, Austria

3

rd

Edition of International Conference and Exhibition on

Polymer Chemistry

T

he incorporation of lignocellulosic materials as a

reinforcing component in polymer composites has received

increased attention, primarily as industry attempts to lessen

the dependence on the unrenewable petroleum supplies and

to follow the concept of a circular economy. Nanofibrillated

cellulose (NFC), derived from cellulose, the most abundant

biopolymer, is one of the most promising materials. One

of the key issues that have been largely investigated is the

compatibility of the NFC with polymers. The main challenge is

the poor adhesion and dispersibility of the NFC in the synthetic

or biobased hydrophobic polymer matrices due to the dissimilar

nature of the components. In this work we applied Kraf lignin

as by product from pulp production for surface modification of

commercial NFC to increase the compatibility with polylactic

acid (PLA), a biodegradable and bioactive thermoplastic

aliphatic polyester. The lignin surface coverage and

morphology was determined by scanning electron microscope

and potentiometric titration. The hydrophilicity/hydrophobicity

effect of adsorbed and polymerized lignin on the 3D printed

composite mechanical properties was also studied. The

results indicated increased hydrophobic character of NFC upon

lignin surface adsorption and enzymatic polymerization that

led to an improved interfacial adhesion with PLA resulting in

increased composite mechanical properties (tensile modulus

and strength at yield).

Biography

Mojca Božič is an Assistant Professor of Materials in University of Mari-

bor at Faculty of Mechanical Engineering in Slovenia. She has more than

13 years of experience in the field of Material Chemistry (expertise in en-

zymatic synthesis and bio-catalysis, development of multifunctional biode-

gradablematerials etc.) as well Nanotechnology (expertise in nano-particles

synthesis), and surface characterization, modification and their application.

She is working on biochemical functionalization and cross-linking of poly-

saccharide with focus on chitosan and nanocellulose, and biobased-based

polymers.

mojca.bozic@um.si

3D printing of biocomposite of polylactic acid and lignin

modified cellulose nanofibrils

Mojca Božič

1

, Silvo Hribernik

1

, Manja Kurečič

1,2

, Barbara Kaker

1

, Janez Slapnik

3

,

Silvester Bolka

3

and

Karin Stana Kleinschek

1,2

1

University of Maribor, Slovenia

2

Graz University of Technology, Austria

3

Faculty for Polymer Technology, Slovenia

Mojca Božič et al., Polym Sci, Volume 4

DOI: 10.4172/2471-9935-C1-008