Problem Homeowners eager to improve their energy bills will use spray-polyuretha

Question

Problem Homeowners eager to improve their energy bills will use spray-polyurethane foam to add insulation to their attic spaces. a. While safe when the reaction is complete, many insulation foams release isocyanate during and immediately after installation. What are the hazards of this volatile organic compound? b. Professor Richard Wool at the University of Delaware developed bio-based substitutes for high-performance materials, including isocyanate foams. For his innovative work, he won a Presidential Green Chemistry Challenge Award in 2013. Prepare a summary of his accomplishments

Explanation / Answer

A) Isocyanates are compounds containing the isocyanate group (-NCO). They react with compounds containing alcohol (hydroxyl) groups to produce polyurethane polymers, which are components of polyurethane foams, thermoplastic elastomers, spandex fibers, and polyurethane paints. Isocyanates are the raw materials that make up all polyurethane products. Jobs that may involve exposure to isocyanates include painting, foam-blowing, and the manufacture of many Polyurethane products, such as chemicals, polyurethane foam, insulation materials,

Isocyanates include compounds classified as potential human carcinogens and known to cause cancer in animals. The main effects of hazardous exposures are occupational asthma and other lung problems, as well as irritation of the eyes, nose, throat, and skin.

HAZARDS OF ISOCYANATE

Short-term exposure to isocyanates can cause minor health issues. Long-term exposure can cause a form of asthma. Workers can also become so sensitive to isocyanates that they can no longer work when the chemicals are present. This could force workers to change careers.

The most common health issues caused by these chemicals are the following:

B)

Professor Richard Wool has created several high-performance materials using biobased feedstocks, including vegetable oils, chicken feathers, and flax. These materials can be manufactured using less water and energy, and producing less hazardous waste compared to petroleum-based processes. Professor Wool's products can be used as adhesives, composites, foams, and even as circuit boards and as a leather substitute.Professor Wool has developed several new biobased materials that can be used as substitutes for toxic substances used to make high-performance materials, like adhesives, composites, and foams. The processes to create these biobased materials yield less waste, require less water and energy, and are well-suited to mass production. His materials start with vegetable oils triglycerides and vegetable oil free fatty acids, cellulose and lignin from wood or plant stalks, and fibrous materials such as flax and chicken feathers.

To design these new biobased materials, Professor Wool evaluates the mechanical and thermal properties of the resins, integrates molecular design, and selects products with minimal toxicity. He developed the Twinkling Fractal Theory (TFT) to help predict the functional properties of a material based on its molecular properties, enabling a more focused design approach. He then evaluates the potential toxicity of the materials using the U.S. EPA’s EPI SuiteTM software. Using these design and predictive methods, Professor Wool has synthesized a number of lignin-based replacements for styrene and identified three of these as being less toxic. Other products that Professor Wool has designed include chemically functionalized high oleic soy oil used in pressure sensitive adhesives and elastomers, composite resins, a thermoplastic polyurethane (TPU) substitute, and an isocyanate-free foam from plant oils. The TPU substitute was developed in collaboration with Professor Epps, also of the University of Delaware. In addition to its reduced toxicity, the biobased foam is also compatible with living cells and supports the growth of human tissue. One of Professor Wool’s more recent inventions is a breathable, bio-based “Eco-Leather”, which avoids the traditional leather tanning process and can be entirely vegan. This work was done in collaboration with Professor Huantian Cao of the Fashion and Apparel Department at the University of Delaware.

Since 1992, Professor Wool has been awarded five patents for his safer materials and has applied for three additional patents. As of 2012, Dixie Chemical began producing Professor Wool’s bio-based composite resins for a worldwide market. His discoveries led to the development of soy-based composites used to make boats, tractor panels, and wind turbine parts. He developed the biobased foam replacement for polyurethane in collaboration with Crey Bioresins Inc. This biobased foam is now being considered as a replacement component by several packaging and automotive suppliers. Professor Wool’s start-up company, Eco-Leather Corp., has entered into collaborations with Nike and Puma to use his leather substitute in their products.

Short-term exposure

• Vapours can cause irritation or burning in the eyes, nose, throat, and skin
• Liquids can cause rashes, reddening, or blistering

Long-term exposure

• Isocyanate asthma
• Strong sensitivity to isocyanates. Workers can have a reaction even if there are only a few molecules of it in the air

B)

Professor Richard Wool has created several high-performance materials using biobased feedstocks, including vegetable oils, chicken feathers, and flax. These materials can be manufactured using less water and energy, and producing less hazardous waste compared to petroleum-based processes. Professor Wool's products can be used as adhesives, composites, foams, and even as circuit boards and as a leather substitute.Professor Wool has developed several new biobased materials that can be used as substitutes for toxic substances used to make high-performance materials, like adhesives, composites, and foams. The processes to create these biobased materials yield less waste, require less water and energy, and are well-suited to mass production. His materials start with vegetable oils triglycerides and vegetable oil free fatty acids, cellulose and lignin from wood or plant stalks, and fibrous materials such as flax and chicken feathers.

To design these new biobased materials, Professor Wool evaluates the mechanical and thermal properties of the resins, integrates molecular design, and selects products with minimal toxicity. He developed the Twinkling Fractal Theory (TFT) to help predict the functional properties of a material based on its molecular properties, enabling a more focused design approach. He then evaluates the potential toxicity of the materials using the U.S. EPA’s EPI SuiteTM software. Using these design and predictive methods, Professor Wool has synthesized a number of lignin-based replacements for styrene and identified three of these as being less toxic. Other products that Professor Wool has designed include chemically functionalized high oleic soy oil used in pressure sensitive adhesives and elastomers, composite resins, a thermoplastic polyurethane (TPU) substitute, and an isocyanate-free foam from plant oils. The TPU substitute was developed in collaboration with Professor Epps, also of the University of Delaware. In addition to its reduced toxicity, the biobased foam is also compatible with living cells and supports the growth of human tissue. One of Professor Wool’s more recent inventions is a breathable, bio-based “Eco-Leather”, which avoids the traditional leather tanning process and can be entirely vegan. This work was done in collaboration with Professor Huantian Cao of the Fashion and Apparel Department at the University of Delaware.

Since 1992, Professor Wool has been awarded five patents for his safer materials and has applied for three additional patents. As of 2012, Dixie Chemical began producing Professor Wool’s bio-based composite resins for a worldwide market. His discoveries led to the development of soy-based composites used to make boats, tractor panels, and wind turbine parts. He developed the biobased foam replacement for polyurethane in collaboration with Crey Bioresins Inc. This biobased foam is now being considered as a replacement component by several packaging and automotive suppliers. Professor Wool’s start-up company, Eco-Leather Corp., has entered into collaborations with Nike and Puma to use his leather substitute in their products.

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