Polyurethanes - February 2011
This month we're looking at polyurethanes.
Polyurethanes are very versatile materials that can be utilised in many forms, from solid, rigid polyurethane, through softer PU adhesives and sealants to a huge range of foams. They find applications in virtually every walk of life, from a host of functions in the building industry, automotive interiors and electronic components through to carpet backing, packaging and footwear.
As this class of polymers is key in so many industries they are continually being researched in terms of their chemistry and formulation with various additives; their behaviour, for example as a shape memory material; and in terms of their end-use applications, considering factors including biocompatibility and ecological issues.
Abstracts
Please see below a selection of abstracts highlighted in the February Newsletter. These are records which relate to polyurethanes that have been recently added to the Polymer Library.
Click on the 7-digit accession numbers to find out about ordering a copyright-cleared full text copy of the items shown.
1074860 - PREPARATION AND CHARACTERIZATION OF ELECTROCONDUCTIVE ADHESIVES OF NANOG/POLYURETHANE-EPOXY IPNS
Polyurethanes (PU) based on toluene diisocyanate (TDI) and polypropylene glycol 2000 (PPG) were reacted with an epoxy resin (EP) to prepare interpenetrating polymer networks (IPNs). Three kinds of electroconductive adhesives were prepared by dispersing nano-graphite (NanoG) into different matrices, i.e., pure PU, crosslinked PU/EP, and pure EP. The effects of epoxy content on morphological structure, conducting properties, thermal stability, and adhesive properties of the electroconductive adhesives were investigated by Fourier transform infrared spectroscopy, scanning electron microscopy, standard digital multimeter, dynamic mechanical thermal analysis, and lapshear tests. The results indicate that epoxy in the polyurethane-epoxy IPN adhesives plays an important role in clanging the morphological structure and improving conductivity properties, thermal stability, and adhesive properties of the electroconductive adhesives of PU. 15 refs.
The Journal of Adhesion, 86, No.8, August 2010, p.791-804, ISSN: 0021-8464, DOI: 10.1080/00218464.2010.498306
Xiangrong Xi; Zhenming Ye; Chaosheng Yu; Wei Lin; Xin Qi; Lin Wang; Qi Xiong
1074133 - NANOCLAY FILLED SOY-BASED POLYURETHANE FOAM
Polyurethane foam was fabricated from polymeric diphenylmethane diisocyanate (pMDI) and soy-based polyol. Nanoclay Cloisite 30B was incorporated into the foam systems to improve their thermal stabilities and mechanical properties. The densities of the nanoclay soy-based polyurethane foams were greater than that of the neat soy-based polyurethane foam. At a loading of 0.5 php nanoclay, the compressive strength, flexural strength, and modulus of the soy-based polyurethane foam were increased compared with of the neat soy-based polyurethane foam. The storage modulus of the soy-based polyurethane foam was also improved by the incorporation of the nanoclay. The glass-transition temperature of the foam increased with increasing loading of the nanoclay. 23 refs.
Journal of Applied Polymer Science, 119, No.3, 5th Feb.2011, p.1857-1863, ISSN: 0021-8995, DOI: 10.1002/app.32901
Liang K; Shi S Q
1074051 - NEW PRODUCT DEVELOPMENT IN FLAME RETARDANTS FOR THE POLYURETHANE INDUSTRY
Flame retardants play an important role in meeting code requirements as well as product performance requirements in PU foam applications. ICL-IP has developed flame retardant products to meet the ongoing challenges of today's market where superior performance in fire tests is required. These include halogenated and halogen-free products that have been developed for various applications including PU rigid and flexible foams as well as polyisocyanurate foams. Product sustainability continues to be a major criterion for development. Evaluations were conducted on laboratory scale to show improvements in flame retardant properties. Although there are ongoing development activities of reactive, polymeric and non-reactive products, the most recent results associated with the development of new halogen-free products for flexible PU foam are presented. 4 refs.
PU Magazine, 7, No.6, Dec.2010-Jan.2011, p.332-335, ISSN: 1864-5534
Nagridge M; Pinzoni M; Piotrowski A; Stowell J; Williams B
1073507 - TRELLEBORG'S ACQUISITION OF UK-BASED PPL POLYURETHANE PRODUCTS FINALISED (short article, Free Access to Full Text)
Reported in this small press release is the news that the acquisition of the privately-owned company PPL Polyurethane Products Ltd. by Trelleborg has now been finalised. PPL is based in the UK and develops, manufactures and markets a broad portfolio of PU-based solutions and products, with a focus on the offshore oil/gas and infrastructure segments. The company has annual sales of approximately SEK 90 M and approximately 90 employees.
Trelleborg, 5th Jan.2011, http://www.trelleborg.com/en/Media/Press-Releases/Press-releases/?iid=535937
1073184 - UV CURABLE POLYESTER-BASED POLYURETHANE ACRYLATE NANOCOATING
The synthesis of a novel nanocomposite coating based on a UV-curable polyurethane acrylate derived from polyester polyol, a blend of isophorone diisocyanate and toluene diisocyanate, and hydroxyethyl acrylate, with various proportions of silica nanoparticles, and its characterisation by FTIR, GPC, XRD and SEM is described. The effects of silica content on the mechanical, chemical and optical properties of films were investigated by scratch hardness, pencil hardness, impact resistance, flexibility, tensile strength, cross-hatch adhesion, abrasion resistance, chemical and solvent resistance, gloss, and UV resistance measurements and the results are discussed. 27 refs.
Pigment and Resin Technology, 39, No.5, 2010, p.268-276, ISSN: 0369-9420, DOI: 10.1108/03699421011076371
Mhatre R A; Mahanwar P A; Shertukde V V; Bambole V A
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