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Types of Step-Growth Polymers: Polyesters

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

Bioplastics

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

Classification and Mechanical Properties of Synthetic Polymers

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...

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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

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Published on: March 8, 2019

Recent advances in vegetable oil-based polyurethanes.

Daniel P Pfister¹, Ying Xia, Richard C Larock

¹Department of Chemistry, Iowa State University, Ames, IA 50011, USA.

|May 21, 2011

Summary

Recent advances show vegetable oils can produce versatile polyurethanes. These bio-based polymers offer properties comparable or superior to petroleum-based ones for diverse industrial applications.

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Area of Science:

Polymer Science
Materials Science
Green Chemistry

Background:

Polyurethanes are versatile polymers synthesized from various monomers, including diols and polyols.
Vegetable oils are increasingly explored as sustainable feedstocks for polymer production due to their low cost and abundance.
Diverse monomers, such as polyols and isocyanates, can be derived from vegetable oils.

Purpose of the Study:

To review recent advancements in producing polyurethane materials from vegetable oils.
To highlight the potential of vegetable oil-based monomers for creating a wide array of polyurethanes.
To compare the properties of vegetable oil-based polyurethanes with conventional petroleum-based counterparts.

Main Methods:

Synthesis of polyols and diisocyanates from vegetable oil feedstocks.
Polymerization of vegetable oil-derived monomers into polyurethanes.
Characterization of thermal and mechanical properties of the resulting polyurethane materials.

Main Results:

Vegetable oils can be effectively converted into a broad spectrum of monomers for polyurethane synthesis.
A wide variety of polyurethane materials, including flexible foams, ductile, and rigid plastics, can be produced.
The thermal and mechanical properties of these bio-based polyurethanes are often comparable or superior to petroleum-derived ones.

Conclusions:

Vegetable oil-based polyurethanes represent a sustainable and high-performance alternative to traditional polyurethanes.
These bio-based materials are suitable for various industrial applications, offering comparable or enhanced properties.
The use of vegetable oils in polyurethane production aligns with green chemistry principles and promotes resource sustainability.