The Effect Of Chemically Modified Lignin As A Filler In Ultraviolet Curable Resin System
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Date
2011-06
Authors
Koay, Ee Ling
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Alcell lignin was used as filler and reactive component in a ultraviolet (UV)
curable system. In the preliminary study, different parameters have been used such as
type of photoinitiator, percentage of photoinitiators and to determine suitable
photoinitiator in the presence of lignin. The results showed gel content of the film of
free radical photoinitiator has higher efficiency than cationic photoinitiator.
Subsequently, the effect of lignin content in UV curable system was studied. The
results indicated that the hardness of film increase as the lignin content was increased
to the optimum point (10%), after which it decreased. This phenomenon may due to
the insufficient resin or oligomer to act as matrix to hold the lignin as filler in the
system. In order to enhance the interfacial of lignin and matrix of resin, chemical
modification of lignin has been carried out with glycidyl methacrylate (GMA) and
ally glycidyl ether (AGE). The result indicated that the increase the ratio of the
reactant to lignin could increased WPG. It can be said that interaction between lignin
and reactant has occurred and more unsaturated groups have been added in lignin
molecule. Iodine number determination of modified lignin was carried out the similar
trends observed with WPG result. The effect of lignin as filler and reactive
component in ultraviolet curable resin systems were investigated by tensile strength,
tensile modulus, elongation at break, gel content, pendulum hardness, cross hatch
adhesion, abrasion resistance and Fourier transform infrared spectroscopy (FTIR). In
addition to that, weight percentage gain (WPG) and iodine number was used to study
the modification effect of lignin.
Description
Keywords
The effect of lignin content , in UV curable system