Cross-linking in free-radical polymerizations: kinetics and mechanical properties. Cross-linked polymer chains are joined together in a ?ladder? topology. This often occurs either deliberately or accidentally in industrial systems, and affects polymer properties. However, cross-linking mechanisms are poorly understood, and there are no general means of quantitatively controlling effects on mechanical properties. As a by-product from a previous IREX grant, a means was found to grow polymers with ....Cross-linking in free-radical polymerizations: kinetics and mechanical properties. Cross-linked polymer chains are joined together in a ?ladder? topology. This often occurs either deliberately or accidentally in industrial systems, and affects polymer properties. However, cross-linking mechanisms are poorly understood, and there are no general means of quantitatively controlling effects on mechanical properties. As a by-product from a previous IREX grant, a means was found to grow polymers with controlled cross-linking. This proposal exploits this method to synthesize polymers with different amounts of cross-linking, and to examine their formation mechanisms and mechanical properties. This has the potential of improving means of making rubber-based materials by polymer modification.Read moreRead less
High purity formaldehyde production from carbon oxides. This project aims to investigate the detailed reaction mechanism of a green chemistry route of producing formaldehyde by reducing carbon monoxide and carbon dioxide in liquid phase. Formaldehyde is a widely used feedstock for chemical industries, but is not considered a green chemical because it is produced using natural gas as the feed, which loses over 61 per cent of energy. This project will maximise the yield and purity of the product, ....High purity formaldehyde production from carbon oxides. This project aims to investigate the detailed reaction mechanism of a green chemistry route of producing formaldehyde by reducing carbon monoxide and carbon dioxide in liquid phase. Formaldehyde is a widely used feedstock for chemical industries, but is not considered a green chemical because it is produced using natural gas as the feed, which loses over 61 per cent of energy. This project will maximise the yield and purity of the product, making it commercially viable. This project’s method for producing formaldehyde is expected to reduce the capital cost and energy losses.Read moreRead less
Manufacturing high value carbon products and chemicals from spent tyres. Manufacturing high value carbon products and chemicals from spent tyres. This project aims to develop an innovative and integrated thermochemical process for use of spent tyres. Australia disposes of more than 400,000 tonnes of spent tyres per annum in landfills, stockpiles and random dumping, incurring significant environmental hazards, serious health risks and wastage of resources. This research is expected to result in n ....Manufacturing high value carbon products and chemicals from spent tyres. Manufacturing high value carbon products and chemicals from spent tyres. This project aims to develop an innovative and integrated thermochemical process for use of spent tyres. Australia disposes of more than 400,000 tonnes of spent tyres per annum in landfills, stockpiles and random dumping, incurring significant environmental hazards, serious health risks and wastage of resources. This research is expected to result in new knowledge of the thermal behaviour of rubber and new techniques to identify, extract and use high value carbon materials and chemicals from thermochemical processing of spent tyres. The research outcomes are expected to provide a technological foundation for an emerging industry for environmentally responsible and economically self-sustaining use of spent tyres.Read moreRead less
Molecular archaeology: new knowledge from molecular weight distributions of synthetic and natural polymers. This project will lead to new understanding of how natural and synthetic polymers are formed. Examples are the enzymatic processes that produce the subtle architecture of rice grains, and the processes that pose problems for developing new techniques for making novel polymer-based materials. The fundamental scientific knowledge from this project will provide a platform for the future devel ....Molecular archaeology: new knowledge from molecular weight distributions of synthetic and natural polymers. This project will lead to new understanding of how natural and synthetic polymers are formed. Examples are the enzymatic processes that produce the subtle architecture of rice grains, and the processes that pose problems for developing new techniques for making novel polymer-based materials. The fundamental scientific knowledge from this project will provide a platform for the future development of improved materials, and for superior grain varieties for food and industrial use. These advances will be of significant benefit to Australian industry and consumers.Read moreRead less
On-demand visible light degradable dental materials. This project aims to break new ground in the field of advanced adhesives by pioneering a unique system that can be cleaved with a defined visible light trigger, enabling the removal of previously bonded material without mechanical force. This would allow two materials to be strongly bonded, including dental crowns, braces and implants. The project will advance on-demand degradable materials design, introducing an advanced class of responsive n ....On-demand visible light degradable dental materials. This project aims to break new ground in the field of advanced adhesives by pioneering a unique system that can be cleaved with a defined visible light trigger, enabling the removal of previously bonded material without mechanical force. This would allow two materials to be strongly bonded, including dental crowns, braces and implants. The project will advance on-demand degradable materials design, introducing an advanced class of responsive networks for applications where reversible bonding is critical. It will have flow on benefits in future dental material applications and also have applications where simple-to-remove, temporary adhesives are required.Read moreRead less
Highly Crosslinked Poly(urea-co-urethane) Copolymer Concrete Floor Coatings. Recently developed, poly(urea-co-urethane) concrete floor screeds are used, in the construction industry, to provide protection against corrosive chemicals and abrasive wear; properties unmatched by other commercial floor treatments. Significantly such material has reduced environmental emissions and toxicity hazards. Factors, which affect the cure and performance of poly(urea-co-urethane) flooring materials will now ....Highly Crosslinked Poly(urea-co-urethane) Copolymer Concrete Floor Coatings. Recently developed, poly(urea-co-urethane) concrete floor screeds are used, in the construction industry, to provide protection against corrosive chemicals and abrasive wear; properties unmatched by other commercial floor treatments. Significantly such material has reduced environmental emissions and toxicity hazards. Factors, which affect the cure and performance of poly(urea-co-urethane) flooring materials will now be studied, including the uncontrolled release of carbon dioxide, which results in sporadic blister formation, leading to the on-site product failures that have severely limited the product's commercial growth. Clear understanding of cure chemistry and adhesion will be established for the first, allowing for the products further development.Read moreRead less
Polymerization Mechanism and Kinetics of 1,1-Disubstituted Monomers. This project focuses on two exciting research areas: (I) we have found that an oxygen atom b to the double bond activates radical polymerization, making a whole new family of polymeric structures accessible, and (II) we have strong preliminary data that demonstrates a very large solvent effect on propagation and termination reactions for acrylic monomers with an a-CH2OH functionality, suggesting that significant control can be ....Polymerization Mechanism and Kinetics of 1,1-Disubstituted Monomers. This project focuses on two exciting research areas: (I) we have found that an oxygen atom b to the double bond activates radical polymerization, making a whole new family of polymeric structures accessible, and (II) we have strong preliminary data that demonstrates a very large solvent effect on propagation and termination reactions for acrylic monomers with an a-CH2OH functionality, suggesting that significant control can be exerted over the polymerization process using additives. Additionally, we demonstrate that polymers containing repeat units with an a-CH2OH functionality can undergo reversible cyclization, enabling a whole range of novel functional materials.Read moreRead less
Mechanisms in Catalytic Chain Transfer Polymerization. The aim of the proposed research is to gain more insight into the mechanisms underlying catalytic chain transfer polymerization, a relatively recent controlled radical polymerization technique which is finding an increasing number of industrial applications, especially in the paint and coatings industry. An improved understanding of the catalytic chain transfer process, of which some very important features are still poorly understood, will ....Mechanisms in Catalytic Chain Transfer Polymerization. The aim of the proposed research is to gain more insight into the mechanisms underlying catalytic chain transfer polymerization, a relatively recent controlled radical polymerization technique which is finding an increasing number of industrial applications, especially in the paint and coatings industry. An improved understanding of the catalytic chain transfer process, of which some very important features are still poorly understood, will ultimately lead to better catalyst design and improved process and product control. This in turn will lead to novel polymeric materials.Read moreRead less
Reversible Addition Fragmentation Chain Transfer (RAFT) Free Radical Copolymerizations of Various Monomers. The proposed project will investigate the structure and properties of statistical copolymers prepared via living free radical polymerization. We will study the characteristics of a wide variety of Reversible Addition Fragmentation Chain Transfer (RAFT) copolymerizations using a range of monomers, including those interesting for biomedical and material science applications. We expect to gai ....Reversible Addition Fragmentation Chain Transfer (RAFT) Free Radical Copolymerizations of Various Monomers. The proposed project will investigate the structure and properties of statistical copolymers prepared via living free radical polymerization. We will study the characteristics of a wide variety of Reversible Addition Fragmentation Chain Transfer (RAFT) copolymerizations using a range of monomers, including those interesting for biomedical and material science applications. We expect to gain a deeper understanding of the influence of the RAFT process on the kinetics and mechanism of copolymerization and the properties of the resulting polymers in order to tailor specific polymer materials for biomedial applications.Read moreRead less
Accessing Chain Length Dependent Rate Coefficients in Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerisations. The proposed project combines two exciting research areas, namely the chain length dependencies of kinetic coefficients and reversible addition fragmentation chain transfer (RAFT) polymerisations. The starting point of the project will be a novel technique recently invented by our team for termination rate measurement utilizing the RAFT process. Detailed knowledge of cha ....Accessing Chain Length Dependent Rate Coefficients in Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerisations. The proposed project combines two exciting research areas, namely the chain length dependencies of kinetic coefficients and reversible addition fragmentation chain transfer (RAFT) polymerisations. The starting point of the project will be a novel technique recently invented by our team for termination rate measurement utilizing the RAFT process. Detailed knowledge of chain length dependent rate coefficients in both homo- and copolymerisations is essential from both an academic and industrial perspective, because polymerisation kinetics not only govern the reaction rates but influence directly the polymeric material properties.Read moreRead less