THE SURFACE RESISTANCE VALUE AND PHYSICAL PROPERTIES
OF CONDUCTIVITY FIBER FILLER-COMPOUNDED PES
Yoshihisa Sumita, Hinode Resin Industry Co., Ltd., Takahiro Yoshioka, Kowa-Tec. Inc.,
Hiroyuki Hamada, Hiroyuki Inoya, Kyoto Institute of Technology
Abstract
Although the high-strength resin has been developed as
a metal substitute, many resins are mostly to be an
insulator that does not conduct electricity. There is a
tendency for hoarding the static electricity. Therefore,
highly conductive metal is used as jig and parts that
related to precision parts of vehicle mounted.
PES (polyether sulfone) is an amorphous plastic, which
is high heat resistance. In order to impart conductivity, the
conductive filler and PES were compounded and
measured the surface resistivity and physical properties.
Introduction
The movement to replace metal with plastic has been
accelerated in recent years by the many beneficial
properties of the material, which include its light weight
and processing ease. In many cases, metal is used in areas
where high pressure or high heat is applied, and a lot of
products take advantage of the characteristics of metal.
Wherever high pressure or heat is applied, engineering
plastics have been the primary metal replacements. For
use under harsher conditions, super engineering plastics
such as polyether ether ketone (PEEK) or polyphenylene
sulfide (PPS), and high-performing engineering plastics
such as polyether sulfone (PES), are the replacements of
choice. The PES used in this research is used as
compounds for electronic parts such as relays, IC trays,
copy machine parts, or for medical equipment parts that
need to be sterile, films for LCD substrates used in cell
phones and a variety of others that take advantage of its
resistance to heat, creep, its measurement stability,
incombustibility and hot water resistance. When used for
IC trays, conductivity is an important requirement in
many cases, and in this study, we created a conductivityfiller compounded PES resin to measure its conductivity
and other physical properties.
Materials
1. Sample Preparation
We used BASF Corp.'s Ultrason E 0510 NAT powder
grade for matrix resin of this study. For conductivity
powder, we used stainless powder. We used PES resin in
powder form so that it can accommodate heavy stainless
powder with high specific gravity.
We compounded these with Nakatani Co.'s 50mm singlescrew extruder down to 30%, 40%, 50% of its weight,
forming a dumb-bell specimen from the pellet by using a
75t injection molding machine by Nissei Plastic Industrial
Co.
2. Experimental Methods following the Formation of
Specimens
We obtained the stainless powder by firing up the
specimen in a muffle furnace. To gather data about its
physical properties, we obtained the surface resistivity
value by using a surface resistance meter by Hozan Tool
Industrial Co. Furthermore, we conducted a Charpy
impact test, and measured the tensile strength, flexural
strength and surface hardness of the specimen. We also
performed a post-impact test SEM observation of the
fragmented surface.
Results & Considerations
Table 1 shows the pellet's specific gravity and ash content.
Table. 1 Specific gravity & ash content
Specific
gravity
Ash
content
n-1
1.77
2.03
2.23
n-2
1.78
2.01
2.22
n-3
1.77
2.02
2.23
Ave
1.77
2.02
2.23
n-1
31.7%
42.7%
52.9%
n-2
31.1%
42.7%
52.3%
n-3
31.6%
42.3%
52.9%
Ave
31.5%
42.6%
52.7%
Table 2 shows results of the surface resistivity test on the
dumb-bell sample created from the pellet obtained from
the compound. Results indicate strong surface resistivity
across the board.
Table. 2 Surface Resistivity
Surface
resistivity
n-1
109
106
103
n-2
109
106
103
n-3
109
106
103
Ave
109
106
103
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Fig 1. shows the tensile modulus of PES resin with
stainless powder content, and Fig.2 shows PES's loaddisplacement curve.
Fig.1 Tensile modulus
Fig.2 flexural strength
Fig. 4 Rockwell
We were able to establish that 50% stainless content had
higher impact strength, whereas 30% stainless content
showed greater surface hardness.
Fig.5 SEM 30%
PES resin that contained 50% stainless fiber displayed
higher tensile modulus than that which contained 30% or
40% stainless fiber. As for flexural strength, PES resin
with 30% stainless powder demonstrated higher values
that were on par with standard non-machine filler
compounded results. Fig. 3 and Fig. 4 show results of the
impact test and surface strength, respectively.
Fig.6 SEM 40%
Fig. 3 Izod strength
SPE ANTEC™ Indianapolis 2016 / 90
Fig.7 SEM 50%
Fig. 5 to Fig. 7 are SEM images where the even
distribution can be confirmed.
Conclusions
We discovered that in order to make PES resin
conductive, using resin powder, which is proportionately
completely different from stainless, increases its
dispersibility and creates an even distribution of the two
properties. Furthermore, changing the amount of stainless
powder that's added to the PES resin will create ideal
surface resistivity values at all levels ranging from 10 to
the 9th power at 30%, 10 to the 6th power at 40%, 10 to
the 3rd power at 50%. With this, we can expect PES resin
to become an easy-to-process, reliable metal replacement
with good conductivity.
References
1.
Research Report, Satoshi Morisawa, Mie Prefecture
Industrial Research Institute (38), 49-52, 2013
2.
Technical Research Report, Akihiko Kawano, The
Institute
of
Electronics,
Information
and
Communications Engineers (IEICE) 111 (120), 5558, 2011-07-08
3.
Takeshi Masu, Plastics 61(9), 18-20, 2010-09
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