Huntsman Polyurethanes

Everberg, Belgium

Huntsman Polyurethanes

Everberg, Belgium
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Gooch A.,University of Leeds | Nedolisa C.,University of Manchester | Houton K.A.,University of Leeds | Lindsay C.I.,Huntsman Polyurethanes | And 2 more authors.
Macromolecules | Year: 2012

This article describes the synthesis and surpamolecular assembly of polyurethane-based elastomers. Triple hydrogen bonding between novel amidoisocytosine (AIC) and ureidoimidazole (UIM) motifs is used to promote assembly of the material. The material comprises an amorphous phase derived from a telechelic diol and a hard crystalline phase that comprises the supramolecular end groups. The use of a heterocomplementary hydrogen bonding interaction results in two unique features: (1) assembly of the elastomer occurs only in the presence of both components, and (2) different feed ratios used during synthesis allow the materials properties to be tuned as the stoichiometries of the components found in the amorphous and crystalline phases of the material are varied. The approach hence offers supramolecular control over materials properties and results in materials that can be melted and therefore processed at lower temperature compared to standard covalent elastomers. © 2012 American Chemical Society.

Qian Y.,University of Minnesota | Lindsay C.I.,Huntsman Polyurethanes | MacOsko C.,University of Minnesota | Stein A.,University of Minnesota
ACS Applied Materials and Interfaces | Year: 2011

Natural vermiculite was modified by cation exchange with long-chain quaternary alkylammonium salts and then dispersed in polyether-based polyols with different structures and ethylene oxide/propylene oxide ratios. The dispersions were evaluated by X-ray scattering and rheology. In all polyol dispersions tested, polyols were intercalated into the vermiculite interlayers. Also, significant shear thinning behavior was observed. A large interlayer spacing of ∼90 Å was achieved in one polyol suitable for polyurethane elastomer synthesis. In polyurethane made with this polyol, clay platelets were extensively intercalated or exfoliated. The composites showed a >270% increase in tensile modulus, >60% increase in tensile strength, and a 30% reduction in N 2 permeability with a loading of 5.3 wt % clay in polyurethane. Differential scanning calorimetry and dynamic mechanical analysis revealed that the nanoclay interacts with the polyurethane hard segments. © 2011 American Chemical Society.

Gooch A.,University of Leeds | McGhee A.M.,University of Leeds | Pellizzaro M.L.,University of Leeds | Lindsay C.I.,Huntsman Polyurethanes | Wilson A.J.,University of Leeds
Organic Letters | Year: 2011

Linear arrays of hydrogen bonds represent important elements of the supramolecular toolkit for receptor design, assembly of supramolecular polymers, and other well-defined supramolecular structures. It is illustrated that remote substituent effects control dimerization affinity in a predictable manner using a conformer independent ureidoimidazole DDA motif and its amidoisocytosine based AAD partner. © 2010 American Chemical Society.

Alexander A.-M.,University of Glasgow | Alexander A.-M.,Ohio State University | Hargreaves J.S.J.,University of Glasgow | Mitchell C.,Huntsman Polyurethanes
Topics in Catalysis | Year: 2013

The denitridation behaviour of binary iron, cobalt and rehnium nitrides under H2 /Ar has been investigated. The iron nitride was found to lose over 70 % of its as prepared nitrogen content at 400 C. The cobalt nitride was completely denitrided at 250 C. Rhenium nitride lost close to 90 % of its nitrogen at 350 C. In addition, Co-Re4 prepared by ammonolyis was investigated, whilst only traces of NH3 were lost from this material under H2/Ar at 400 C, with H2/N2 it proved to be an active ambient pressure ammonia synthesis catalyst in accordance with previous literature. © 2013 The Author(s).

Hamdy M.S.,Wageningen University | Hamdy M.S.,Helwan University | Scott E.L.,Wageningen University | Carr R.H.,Huntsman Polyurethanes | Sanders J.P.M.,Wageningen University
Catalysis Letters | Year: 2012

The photocatalytic conversion of an aqueous solution of l-tryptophan (Trp) to kynurenine (KN) was investigated under the illumination of different light sources. Results show that Trp converted to KN with a selectivity of 64% under the illumination of a medium pressure (MP) Hg lamp. KN selectivity was increased to >90% when black light (BL) was used a light source. The novel use of BL in the photocatalytic conversion of Trp to KN significantly reduces the energy consumption compared with MP light. © 2012 The Author(s).

Botella P.,Polytechnic University of Valencia | Corma A.,Polytechnic University of Valencia | Carr R.H.,HUNTSMAN Polyurethanes | Mitchell C.J.,HUNTSMAN Polyurethanes
Applied Catalysis A: General | Year: 2011

Delaminated materials ITQ-2, ITQ-6 and ITQ-18 are very efficient catalysts of zeolitic nature for the synthesis of diamino diphenyl methane (DADPM), the polyamine precursor in the production of MDI for polyurethanes. The exfoliation process results in excellent accessibility of their active sites to reactant molecules as well as fast desorption of products. These catalysts present higher activity and slower rates of deactivation than their corresponding zeolites. Moreover, the topology of the delaminated structure imposes a precise control of the isomer distribution, offering an additional flexibility in the synthesis of DADPM. By optimizing the process conditions it is possible to achieve final DADPM crude under industrial production specifications with ITQ-18. This catalyst represents a real chance for replacing HCl in the industrial production of DADPM. © 2011 Elsevier B.V.

Vangronsveld E.,Huntsman Polyurethanes
International Wood Products Journal | Year: 2012

Methylene diphenyl diisocyanate (MDI) is being used increasingly as an alternative resin in the composite wood industry for environmental, indoor air, production capacity or quality reasons. This paper gives an overview of the hazards, classification, regulations and exposure risks related to the use of MDI and MDI bonded wood products. Its aim is to provide factual scientific information to address some of the concerns regularly encountered when introducing MDI as a resin. Like all chemicals, MDI has its hazards and is regulated within existing regulatory frameworks like Globally Harmonized System (GHS) the European Regulation for the REACH, Evaluation, Authorization and Restriction of Chemicals (REACH) and Classification, Labelling & Packaging (CLP). It is important to understand the risks associated with chemicals in the workplace to raise awareness with workers. Understanding safety issues has equal value in identifying where to implement risk reduction measures so workers are protected, and in ensuring investments are economically feasible. The inhalation exposure risks of MDI are given based on an extensive dataset and compared with other agents present in the workplace, i.e. wood dust and formaldehyde. In addition, this paper addresses the risk for consumers for the use of MDI bonded composite wood products (CWPs). The conclusion is that MDI has been classified as a hazardous chemical; however, safe use can be demonstrated within the REACH framework. The exposure risks of MDI, compared to other chemical agents present in the workplace, are significantly lower and can be reduced further if actions are taken to control wood dust. Furthermore, there is no need for concern regarding exposure to consumers if MDI bonded CWPs are used in buildings or homes. © 2012 IWSc.

Alexander A.-M.,University of Glasgow | Hargreaves J.S.J.,University of Glasgow | Mitchell C.,Huntsman Polyurethanes
Topics in Catalysis | Year: 2012

Metal nitrides may be of interest as potential sources of activated nitrogen which can be reacted with target organic molecules. Accordingly, the reduction of nitrogen within Ni 3N, Cu 3N, Zn 3N 2 and Ta 3N 5 under a 1/3 Ar/H 2 flow at elevated temperature has been determined as a simple test of lattice nitrogen reactivity. As anticipated by consideration of their stability, Ni 3N and Cu 3N are reduced completely at 250 °C with up to 30 % of their total lattice nitrogen yielding ammonia. The elimination of N2 results in the formation of pores which are particularly pronounced in the case of the denitrided Cu system. In the case of Zn 3N 2, the lattice nitrogen is less reactive with incomplete denitridation being observed at 400 °C and the amount of ammonia produced being 15 % of the total nitrogen available. Although Ta 3N 5 contains the least reactive nitrogen of the four samples studied, it can be regenerated by ammonolysis which is an important consideration in any envisaged application. © Springer Science+Business Media, LLC 2012.

Harikrishnan G.,Indian Institute of Technology Kharagpur | Patro T.U.,Indian Institute of Technology Bombay | Patro T.U.,Defense Institute of Advanced Technology | Unni A.R.,Huntsman Polyurethanes | Khakhar D.V.,Indian Institute of Technology Bombay
Soft Matter | Year: 2011

Remarkable evolutionary changes in cell morphology during reactive polymer nanocomposite foaming are observed by controlled foaming of suspensions of montmorillonite clay in the oligomeric polyurethane component. Delaminated nanoplatelets, when present as a networked cluster in suspensions, are shown to have very high efficiency in generating gas embryos for bubble nucleation. In the post-nucleation foaming period, clay nanoplatelets show an additional de-wetting behavior. The packing fraction of clay platelets in suspension and the consequent suspension rheology affect the final foam morphology. © 2011 The Royal Society of Chemistry.

News Article | November 1, 2016

Dr Uday Vaidya, a professor at University of Tennessee-Knoxville and chief technology officer for the Institute for Advanced Composites Manufacturing Innovation has been named the SPE Composites Division's 2015-2016 Composites Person of the Year. The Composites Person of the Year award publicly acknowledges a contributor who has provided significant aid to the SPE Composites Division, particularly during the prior year, as well as made broader contributions to the composites industry as a whole. Dr Vaidya, who was honored during the 2016 SPE show, has contributed extensively to research and development of engineered polymers, fibers, and composites and has experience with a broad range of composites for defense, transportation, and industrial applications. Additionally, he has served as principal investigator or co-investigator on more than 100 projects worth over US$22 million to date. The professor is also principal and co-founder of Innovative Composite Solutions (ICS), an Alabama company that was established in 2009.  ICS has commercial ventures with high-tech, lightweight composite products for the infrastructure/buildings, power transmission, defense, biomedical devices, and commodity markets. Vaidya also has served as consultant for a number of companies producing fiber-reinforced plastic piping, power/energy, and plastic products. Dr Vaidya has also been published in over 180 peer-reviewed international journals and over 350 conference proceedings. He has 29 years' teaching experience at five academic institutions where he has taught and mentored hundreds of engineering students and has received numerous teaching awards. Fostering development ‘Uday was chosen for his long-time contributions to the SPE Composites Division, including nine years of leadership on the education committee and eight years organizing the SPE ACCE student poster competition,’ said Dr Michael Connolly, SPE Composites Division chair and program manager, urethane composites, at Huntsman Polyurethanes. ‘Last year he created a new program under the education committee that helps universities apply for funding from the Composites Division — with university matching funds — to purchase teaching materials and laboratory equipment. In addition to these contributions, his effort fostering student development by organizing and advising a new SPE student chapter at University of Tennessee-Knoxville benefits all of SPE as well as the plastics and composites industries.’ This story is reprinted from material from SPE, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

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