Environmentally Compliant Vinyl Ester Resin (VER) Composite Matrix Resin Derived from Renewable Resources

WP-1755

Objective

Use of composite materials for construction of Department of Defense (DoD) weapons platforms will approach 200 million pounds per year. Vinyl ester resin (VER) is a low-cost resin that can be processed at ambient temperature using vacuum-assisted resin transfer molding (VARTM) into massive carbon-fiber-reinforced composite structures such as ship hulls and transportation vehicles. Since VER production is highly dependent on oil, it is subject to fluctuating prices and limitations in supply. The continued viability of this strategic DoD weapons material is further jeopardized by the manufacture use of hazardous materials, epichlorohydrin and styrene.

The objective of this limited scope SERDP project was to demonstrate feasibility of producing a sustainable, environmentally safe vinyl ester resin for military structural composite weapons systems starting with low-cost lignin and glycerin waste streams.

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Technical Approach

The synthesis of vinyl ester resin from lignin was conducted in four consecutive chemical reaction steps:

  1. Isolation of phenol from lignin via hydrolysis in supercritical water
  2. Conversion of phenol to bisphenol A
  3. Synthesis of glycidyl methacrylate from glycerin via conversion to glycidol followed by reaction with methacrylic acid
  4. Synthesis of vinyl ester resin via reaction of bisphenol A with glycidyl methacrylate, eliminating use of toxic epichlorohydrin

Published procedures were used for each step, in order to minimize danger, risk and time.

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Results

During this project, the presence of phenol in lignin hydrolysis reaction products was confirmed at 5-10% yield. Substituted phenolics guaicol and catechol were also produced that can subsequently be converted to phenol to increase yield. Synthesis of bisphenol A from authentic phenol was achieved in >90% yield. Glycidyl methacrylate was synthesized via direct reaction of glycidol with methacrylic acid in >90% yield. Reaction of bisphenol A with glycidyl methacrylate produced vinyl ester resin in >95% yield. Environmental safety in each step was assured through use of approved equipment and safe working practices. Phase I results indicated that feasibility had been demonstrated and that work should continue to refine each intermediate step, scale up to larger quantities, and produce carbon-fiber reinforced vinyl ester resin composite components for military weapons.

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Benefits

This successful program can provide a sustainable, environmentally safe source of vinyl ester resin monomer and other valuable chemical starting materials, starting from inexpensive, nonpetroleum waste streams of lignin and glycerin. This can enhance the independence of the United States from foreign oil.

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Project Documents

Points of Contact

Principal Investigator

Dr. Yongwoo Lee

QinetiQ North America Operations LLC

Phone: 781-684-3923

Fax: 781-684-4600

Program Manager

Weapons Systems and Platforms

SERDP and ESTCP

Project Documents

Document Types

  • Fact Sheet - Brief project summary with links to related documents and points of contact.
  • Final Report - Comprehensive report for every completed SERDP and ESTCP project that contains all technical results.
  • Cost & Performance Report - Overview of ESTCP demonstration activities, results, and conclusions, standardized to facilitate implementation decisions.
  • Technical Report - Additional interim reports, laboratory reports, demonstration reports, and technology survey reports.
  • Guidance - Instructional information on technical topics such as protocols and user’s guides.
  • Workshop Report - Summary of workshop discussion and findings.
  • Multimedia - On demand videos, animations, and webcasts highlighting featured initiatives or technologies.
  • Model/Software - Computer programs and applications available for download.
  • Database - Digitally organized collection of data available to search and access.