![](bg1.png)
Study on the Damping Mechanism of Chlorinated Butyl
Rubber/C5 Petroleum Resin Composites by Experimental
and Molecular Dynamics Simulation
C Yin, J Zhu, L Lu, M F Wang, Q Zhang and S Z Wu
*
College of Materials Science and Engineering, Beijing University of Chemical
Technology, Beijing 100029, P. R. China
Corresponding author and e-mail: S Z Wu, wusz@mail.buct.edu.cn
Abstrac t. In this work, the damping mechanis m of C5 petroleum resin/chlorinated butyl
rubber (CIIR) composites were studied by combin ing experimental and mo lecular dynamics
(MD) simu lation. From a macro perspective, the damping parameters (glass transition
temperature T
g
and effective da mp ing temperature region ΔT) and the activation energy (E
a
)
were obtained by dynamic mechanical thermal analysis. In the micro level, four
intermolecular interaction parameters (binding energy E
binding
, fractional free volume, mean
square radius of gyration and mean square displacement) were calculated by molecular
dynamics simulations. These studies are expected to provide the useful information in
understanding the damping mechanism and to offer the theoretical guidance for optimizing
the damping properties of polymer composites.
1. Introduction
In the past decades, how to effectively reduce the noise pollution or mechanical vibration has become
a hot topic[1]. Viscoelastic polymer used as damping materials have attracted a considerable
attention for converting vibration or noise energy to heat energy. As we know, the excellent damping
materials should have suitable glass transition temperature which is better close to application
condition and also should be with the wide effective damping temperature region.
Comparing with other polymer matrices, the chlorinated butyl rubber (CIIR) has preferable
damping properties due to its dense side methyl groups, lower molecular mobility and higher energy
loss. According to reports in the literature[2], CIIR shows a unique relaxation behavior which are the
asymmetrical double-peak structure with a maximum on the high temperature side and the additional
shoulder on the low temperature side. Plazek [3]
and Huang[4, 5] examined that different modes of
CIIR molecular motion contribute to the transition region from local segmental motion, sub-Rouse
mode, and Rouse mode. However, the loss peaks of the above three modes of CIIR molecular motion
are located at lower temperature region rather than room temperature. Therefore, in order to broad
the effect damping temperature region of CIIR composites, many ways have been attempted such as
blend modification, copolymerization,
gradient polymers,
interpenetration network (IPN) polymers
etc[6].
644
Yin, C., Zhu, J., Lu, L., Wang, M., Zhang, Q. and Wu, S.
Study on the Damping Mechanism of Chlorinated Butyl Rubber/C5 Petroleum Resin Composites by Experimental and Molecular Dynamics Simulation.
In Proceedings of the International Workshop on Materials, Chemistry and Engineering (IWMCE 2018), pages 644-650
ISBN: 978-989-758-346-9
Copyright © 2018 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved