BYU

Abstract by Dallin Smith

Personal Infomation


Presenter's Name

Dallin Smith

Degree Level

Undergraduate

Abstract Infomation


Department

Chemistry and Biochemistry

Faculty Advisor

James Patterson

Title

Spectroscopic Effect of Polymer Strain Rate

Abstract

High-density polyethylene (HDPE) is used in a wide variety of everyday materials, from artificial joints to shopping bags. Having a better understanding of its response to mechanical stress will lead to more efficient and durable materials. Vibrational sum-frequency generation (VSFG) has been used to nondestructively determine how HDPE responds to mechanical deformation. Previous results show a correlation between VSFG response and strain length at constant strain rate. The effects of varying strain rate with constant strain length are being investigated currently. A qualitative difference has been observed correlating to orientation between the strain direction and incident beam. Images from a Scanning Electron Microscope have revealed structural variations between samples pulled at various rates. Discovering how strain rate affects HDPE’s response to VSFG will contribute to a deeper understanding of the response of HDPE or other polymers when subjected to mechanical stress.