ERA

Download the full-sized PDF of Water Absorption and Performance Degradation of Natural Fiber Reinforced Thermoplastic CompositesDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3XD0RB7B

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Graduate Studies and Research, Faculty of

Collections

This file is in the following collections:

Theses and Dissertations

Water Absorption and Performance Degradation of Natural Fiber Reinforced Thermoplastic Composites Open Access

Descriptions

Other title
Water Absorption and Performance Degradation of Natural Fiber Reinforced Polyethylene Composites
Subject/Keyword
polyethylene
natural fiber
degradation
mechanical properties
water absorption
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Robertson, Nicole Lee M.
Supervisor and department
Wolodko, John D. (Agricultural, Food and Nutritional Science)
Nychka, John A. (Chemical and Materials Engineering)
Examining committee member and department
Ulven, Chad (Mechanical Engineering)
Choi, Phillip (Chemical and Materials Engineering)
Eadie, Reg (Chemical and Materials Engineering)
Ayranci, Cagri (Mechanical Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2017-09-28T14:13:49Z
Graduation date
2017-11:Fall 2017
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Natural fiber reinforced polyethylene biocomposites are an environmentally friendly alternative to non-biodegradable thermoplastic materials. The addition of natural fibers to polyethylene improves mechanical properties such as tensile modulus and tensile strength. Unlike thermoplastics, biocomposites are water absorbant due to the presence of natural fibers. Biocomposites mechanical properties degrade when exposed to water. Immersion in water shortens the product life of biocomposites and limits their use in many applications. However, a shorter product life is advantageous for some applications because early degradation reduces the material's environmental impact. The work herein explores long-term water immersion (6000+ hours) of injection molded hemp and wood pulp fiber reinforced polyethylene. Both low density polyethylene (LDPE) and high density polyethylene(HDPE) were tested, each with three fiber fill fractions. The comprehensive dataset collected for this project allowed for conclusions to be drawn about the effect of fiber type, content and distribution as a function of immersion time to predict water absorption. The extent of mechanical degradation was proven to be dependent on the quantity of water absorbed. A model was developed to predict the percentage of water absorbed over a long time scale that accounts for fiber degradation to enable the prediction of changes to the mechanical properties. The prediction of the rate and magnitude of water absorption by natural fiber thermoplastic composites will allow designers to understand, and account for, the degradation of the material's mechanical properties over time.
Language
English
DOI
doi:10.7939/R3XD0RB7B
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication

File Details

Date Uploaded
Date Modified
2017-09-28T20:13:49.506+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 14947162
Last modified: 2017:11:08 17:25:02-07:00
Filename: Robertson_Nicole_L_M_201709_PhD.pdf
Original checksum: 8a777776166cdaad9e5d3fa38014c34f
Well formed: true
Valid: false
Status message: Invalid page tree node offset=140659
Status message: Outlines contain recursive references.
File title: Title Page - Executive Summary - Preface 2017-09-24
Activity of users you follow
User Activity Date