Browse Prior Art Database

High Damping Thermoplastic Elastomers

IP.com Disclosure Number: IPCOM000113346D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Allen, RD: AUTHOR [+4]

Abstract

Polymer materials which dissipate energy are critical components in vibration control technology. The dynamic mechanical spectrum of a polymer provides information regarding energy dissipation vs. temperature and frequency. A desirable property for vibration controlling polymer materials is a broad dissipation (called tan delta) vs. temperature and frequency. Polymer materials generally possess high vibration dissipation only in close proximity to the glass transition (Tg). The implication of high dissipation is that vibration over a range and temperature and frequency can be dissipated, minimizing loss of performance. The goal of damping material design is to produce a highly dissipative material which operates efficiently over a broad range of temperatures and frequencies.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

High Damping Thermoplastic Elastomers

      Polymer materials which dissipate energy are critical
components in vibration control technology.  The dynamic mechanical
spectrum of a polymer provides information regarding energy
dissipation vs.  temperature and frequency.  A desirable property for
vibration controlling polymer materials is a broad dissipation
(called tan delta) vs.  temperature and frequency.  Polymer materials
generally possess high vibration dissipation only in close proximity
to the glass transition (Tg).  The implication of high dissipation is
that vibration over a range and temperature and frequency can be
dissipated, minimizing loss of performance.  The goal of damping
material design is to produce a highly dissipative material which
operates efficiently over a broad range of temperatures and
frequencies.  Energy dissipation materials are used in a variety of
technologies, including earthquake-proofing, automotive, and
disk-drive technology.  As an example, high speed disk drives contain
moving parts which experience rapid acceleration/deceleration when
the head/arm assembly seeks information on the disk.  Vibration
resulting from this violent start/stop motion requires dissipation if
high speed access is to be maintained.  Highly dissipative materials,
of the kind found in disk drives, are typically crosslinked
elastomers which are cast as syrups into metal cavities and
polymerized/cured in situ.  Each part in this case represents a
polymerization reaction and as such, control over manufacturing is
difficult.  Cost per part is high.  Conversion of monomer to polymer
is slightly variable (batch-to-batch), thus outgassing of monomer
presents a major problem.

      A new class of damping materials whi...