Title

Role Of Morphology In Damping Efficiency

Report Number

WL-TR-91-3078 Volume I, p. CBC-1

Creator

Sperling, L. H.

Fay, J. J.

Thomas, D. A.

Corporate Author

Lehigh University

Laboratory

Wright Laboratory

Date

1991

Date Issued

1991-08

Extent

1

Contract

Laboratory Research - No Contract

DoD Project

2401

DoD Task

240104

Identifier

ADA241311

Format

1 online resource

Abstract

The role of multiphase morphology in damping was explored using interpenetrating polymer networks and latex blends. Several polymer combinations were employed as model materials. These included acrylics and methacrylics, styrenics, polybutadiene, and poly(vinyl methyl ether). The loss area, LA, under the E"-temperature curves was measured on a Rheovibron at 110 Hz. The results were compared to one-phased statistical copolymers. Several IPN compositions were found which damp more than expected, based on the group contribution analysis found to hold for homopolymers and one-phased statistical copolymers. The damping increases are interpreted in terms of phase continuity and stiffness. In general, high tanδ values would be expected in morphologies where the lower glass transition polymer forms the continuous phase, and the higher glass transition polymer forms the discontinuous phase.
FULL PAPER NOT AVAILABLE FOR PUBLICATION

Description

The role of multiphase morphology in damping was explored using interpenetrating polymer networks and latex blends. Several polymer combinations were employed as model materials. These included acrylics and methacrylics, styrenics, polybutadiene, and poly(vinyl methyl ether). The loss area, LA, under the E"-temperature curves was measured on a Rheovibron at 110 Hz. The results were compared to one-phased statistical copolymers. Several IPN compositions were found which damp more than expected, based on the group contribution analysis found to hold for homopolymers and one-phased statistical copolymers. The damping increases are interpreted in terms of phase continuity and stiffness. In general, high tanδ values would be expected in morphologies where the lower glass transition polymer forms the continuous phase, and the higher glass transition polymer forms the discontinuous phase.
FULL PAPER NOT AVAILABLE FOR PUBLICATION

Distribution Classification

1

Distribution Conflict

No

DTIC Record Exists

No

Illinois Tech Related

No

Photo Quality

Not Needed

Report Availability

Full text available

Type

article

Is Part Of

Proceedings of Damping '91: 13-15 February 1991 San Diego, California (Pages AAC-1 through DCC-19)