Abstract/Details

Studies of the physical, yield and failure behavior of aliphatic polyketones


2002 2002

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Abstract (summary)

This thesis describes an investigation into the multiaxial yield and failure behavior of an aliphatic polyketone terpolymer. The behavior is studied as a function of: stress state, strain rate, temperature, and sample processing conditions. Results of this work include: elucidation of the behavior of a recently commercialized polymer, increased understanding of the effects listed above, insight into the effects of processing conditions on the morphology of the polyketone, and a description of yield strength of this material as a function of stress state, temperature, and strain rate.

The first portion of work focuses on the behavior of a set of samples that are extruded under “common” processing conditions. Following this reference set of tests, the effect of testing this material at different temperatures is studied. A total of four different temperatures are examined. In addition, the effect of altering strain rate is examined. Testing is performed under pseudo-strain rate control at constant nominal octahedral shear strain rate for each failure envelope. A total of three different rates are studied.

An extension of the first portion of work involves modeling the yield envelope. This is done by combining two approaches: continuum level and molecular level. The use of both methods allows the description of the yield envelope as a function of stress state, strain rate and temperature.

The second portion of work involves the effects of processing conditions. For this work, additional samples are extruded with different shear and thermal histories than the “standard” material. One set of samples is processed with shear rates higher and lower than the standard. A second set is processed at higher and lower cooling rates than the standard.

In order to understand the structural cause for changes in behavior with processing conditions, morphological characterization is performed on these samples. In particular, the effect on spherulitic structure is important. Residual stresses are also determined to be important to the behavior of the samples.

Finally, an investigation into the crystalline structure of a family of aliphatic polyketones is performed. The effects of side group concentration and size are described.

Indexing (details)


Subject
Materials science;
Plastics
Classification
0794: Materials science
0795: Plastics
Identifier / keyword
Applied sciences; Aliphatic; Failure; Multiaxial testing; Polyketones; Polymers; Yield
Title
Studies of the physical, yield and failure behavior of aliphatic polyketones
Author
Karttunen, Nicole Renee
Number of pages
166
Publication year
2002
Degree date
2002
School code
0118
Source
DAI-B 63/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0493525866, 9780493525860
Advisor
Lesser, Alan J.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3039365
ProQuest document ID
251687761
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/251687761
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