论文研究 - 通过乙二醛交联研究聚乙烯醇和淀粉共混物的各种组成
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Open Journal of Polymer Chemistry, 2019, 9, 76-85
https://www.scirp.org/journal/ojpchem
ISSN Online: 2165-6711
ISSN Print: 2165-6681
DOI:
10.4236/ojpchem.2019.94007 Oct. 17, 2019 76
Open Journal of Polymer Chemistry
Study on Various Compositions of Polyvinyl
Alcohol and Starch Blends by Cross-Linking
with Glyoxal
Ravindra V. Gadhave
*
, Prakash A. Mahanwar, Pradeep T. Gadekar
Department of Polymer and Surface Engineering, Institute of Chemical Technology, Mumbai, India
Abstract
The aim of this study is to analyze the various compositions of polyvinyl alco-
hol (PVA) and starch blends. The blends have been cross-
linked with glyoxal to
enhance its properties. The hydroxyl groups of PVA and starch react with
glyoxal via formation of acetal bonds; hence crosslinking could take place. The
cross-
linking of glyoxal is observed in various analytical methods such as DSC
and FTIR. The cross-
linked blends showed better thermal and mechanical
properties. Viscosity, tensile shear streng
th, pencil hardness and ultimate stress
were evaluated to estimate the changes due to cross-
linking. It was observed
that the cross-linking is directly proportional to starch, since the starch hydrox-
yl groups are easily accessible for reacting. The cross-linked blend showed bet-
ter cohesion between its chains, thereby increasing glass transition temperature.
It was reflected in the subsequent increase in tensile strength properties.
Keywords
Starch, Polyvinyl Alcohol, Cross-Linking, Glyoxal, Mechanical Testing
1. Introduction
Starch is a relatively inexpensive and renewable product that can be obtained
from multiple plant sources and that has been extensively used as wet end addi-
tive, coating binder, sizing agent, adhesive, and textile size [1] [2]. However, its
bonding capacity is not strong enough to glue wood [3] [4] [5] [6] [7]. A few
studies have been conducted on the potential of utilizing starch as wood adhe-
sive. Recent studies have focused on formaldehyde-free wood adhesives, which
are obtained through the reaction between a cross-linker and a blend of starch
with other polymers, such as starch/polyvinyl alcohol [8], starch/tannin [9] [10]
How to cite this paper:
Gadhave, R.V
.,
Mahanwar, P
.A. and Gadekar, P.T. (2019
)
Study on Various Compositions of Pol
y-
vinyl Alcohol and Starch Blends by
Cross
-Linking with Glyoxal.
Open Journal
of Polymer Chemistry
,
9
, 76-85.
https://doi.org/10.4236/ojpchem.2019.94007
Received:
August 31, 2019
Accepted:
October 14, 2019
Published:
October 17, 2019
Copyright © 201
9 by author(s) and
Scientific
Research Publishing Inc.
This work is licensed under the Creative
Commons Attribution International
License (CC BY
4.0).
http://creativecommons.org/licenses/by/4.0/
Open Access
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