Doctoral Dissertations

Author

Rongpeng Wang

Keywords and Phrases

Epoxidized vegetable oil; Composite; Epoxy; Structural application

Abstract

"Epoxidized vegetable oil (EVO) is one of the largest industrial applications of vegetable oils (VOs) and is widely used as a plasticizer and as a synthetic intermediate for polyol or unsaturated polyester. However, the utility of EVO as monomer for high performance epoxy thermoset polymer is limited by its reactivity and by the resulting physical properties. Herein, VO-based epoxy monomers, i.e., glycidyl esters of epoxidized fatty acids derived from soybean oil (EGS) or linseed oil (EGL), have been synthesized and were benchmarked against commercial available diglycidyl ether of bisphenol A (DGEBA) and also epoxidized soybean oil (ESO) controls. EGS and EGL possessed higher oxirane content, more reactivity and lower viscosity than ESO or epoxidized linseed oil (ELO), provided better compatibility with DGEBA as a reactive diluent, and yielded thermally and mechanically stronger polymers than polymers obtained using ESO. Glass transition temperatures (T[subscript g]) of the VO-based epoxy thermoset polymers were mostly a function of monomer oxirane content with some added structural influences of epoxy reactivity, and presence of a pendant chain. Organo-modified montmorillonite clay (OMMT) and long glass fiber reinforced composites (FRC) were efficiently manufactured using anhydride cured EGS as matrices. The OMMT nanocomposites showed higher mechanical and thermal strength than the neat polymers but were also dependent on the dispersion techniques and the clay concentration. Surprisingly, the neat EGS-anhydride matrix FRC showed comparable properties, such as flexural and impact strengths and slightly lower Tg, versus DGEBA based counterparts. These high performance monomers, polymers, and composites have potential to replace petroleum-based epoxy as value-added products from VOs compared to EVOs"--Abstract, page iv.

Advisor(s)

Schuman, Thomas P.

Committee Member(s)

Chandrashekhara, K.
Collier, Harvest L.
Nam, Paul Ki-souk
Van-De-Mark, Michael R.

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Sponsor(s)

Missouri University of Science and Technology. Department of Chemistry
Missouri University of Science and Technology. Materials Research Center
Missouri University of Science and Technology

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2014

Journal article titles appearing in thesis/dissertation

  • Towards green: a review of recent developments in bio-renewable epoxy resins from vegetable oils
  • Vegetable oil-derived epoxy monomers and polymer blends: a comparative study with review
  • Fabrication of bio-based epoxy-clay nanocomposites
  • Soybean oil derived epoxy-glass fibers reinforced composites for structural application

Pagination

xv, 184 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2014 Rongpeng Wang, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Vegetable oils -- Mechanical properties
Biopolymers
Soy oil

Thesis Number

T 10540

Electronic OCLC #

894221860

Included in

Chemistry Commons

Share

 
COinS