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Greenlist(tm) Bulletin 9/03/04

Greenlist(tm) Bulletin 9/3/04

This is the weekly bulletin of the TURI Library, reporting a selection of recently published titles we have acquired. Our pledge is to keep the bulletin relevant to your work and brief -- no more than 10 titles. (usually)

Titles here, abstracts below them:

1. Thermally Conductive Polymers, January 2004
2. Solvent-Free and M-Pyrol-Free PUDs, May 2004
3. Putting the Brakes on Lead & Cadmium, July 2004
4. Solvent-Free Polyurethanes: Recent Advances and Future Developments, June 2004
5. Cationic Bleach Activators for Improving Cotton Bleaching, August 2004
6. Bacteria from a Cow's Stomach May be Future Source for Wood Adhesive, August 2004
7. Pulp-Bleaching Enzyme, August 2004
8. Biopolymers Could Grow More Attractive, June 2004
9. Nantero to Move Nanotubes into Computer Chips, June 2004
10. New Flame Retardant TPVs for Electrical Applications: New Grades of FR-TPVs Show Promise for Jacketing Purposes as Well as for Insulation Where Lead-Free Formulations are Needed, August 2004

 

1. TITLE Thermally Conductive Polymers
AUTHOR Stewart, Richard
SOURCE Plastics Engineering, January 2004, vol. 60, no. 1, pp. 20-27
ABSTRACT Heat buildup in electronic components, lighting, transformer housings, and other devices that produce unwanted heat can severely limit service life and reduce operating efficiency. Metal, an excellent thermal conductor, has traditionally been used for thermal management equipment such as heat sinks and heat exchangers. But metal parts are heavy and costly to produce. They are being replaced by injection moldable and extrudable heat-conducting plastic compounds that provide lightweight cooling solutions. Advantages include design flexibility, parts consolidation, corrosion and chemical resistance, reduction of secondary finishing operations, and the processing benefits of plastics.

2. TITLE Solvent-Free and M-Pyrol-Free PUDs
AUTHOR Bechara, Ibbrahim; Ma, Albert; Puleo, Anthony
SOURCE Paint & Coatings Industry, May 2004, vol. 20, no. 5, pp. 60-64
ABSTRACT One important side benefit of removing M-Pyrol is the improvement in color stability. As mentioned earlier, M-Pyrol residue in the dried film tends to cause yellowing, particularly at high temperatures. A good illustration of color improvement is the recent development of Crompton's Witcobond W-290HSC in our laboratories. A film from this M-Pyrol-free product was cast on white Carrara glass and subjected to 140 deg.C for 20 hours in a convection oven. Very slight discoloration was observed.

3. TITLE Putting the Brakes on Lead & Cadmium
AUTHOR Graves, Beverly A.
SOURCE Products Finishing, July 2004, vol. 68, no. 10, pp. 46-50
ABSTRACT Ambrake Manufacturing had to remove lead and cadmium from its electroless nickel solution in order to comply with the End of Life Vehicle Directive. The company turned to its electroless nickel suppliers for support.

4. TITLE Solvent-Free Polyurethanes: Recent Advances and Future
Developments
AUTHOR Sams, Ray
SOURCE Journal of Protective Coatings & Linings, June 2004, vol. 21, no. 6, pp. 22-27
ABSTRACT Solvent-free polyurethanes have been available commercially for over 30 years and have gained wide acceptance in many markets over the past 25 years as corrosion-resistant barrier coats, impact- and abrasion-resistant linings, and thermal insulation coatings. This article describes the performance achieved with a solvent-free polyurethane coating and goes on to detail the surface reparation of concrete and the application requirements needed to ensure that the long-term protection capabilities are achieved. Advances in the technology and possible developments are also discussed.

5. TITLE Cationic Bleach Activators for Improving Cotton Bleaching
AUTHOR Cigdem Gursoy, Nevin; El-Shafei, Ahmed; Hauser, Peter; Hinks, David
SOURCE AATCC Review, August 2004, vol. 4, no. 8, pp. 37-40
ABSTRACT Bleaching cotton with hydrogen peroxide requires either high temperatures or long dwell times. Recently developed cationic compounds that rapidly react with hydrogen peroxide to give peracids have been shown to substantially decrease the amount of time necessary to achieve a commercially acceptable white fabric. In this work, commercial recipes for cold pad batch bleaching of knitted cotton fabric were initially investigated. These recipes were used as benchmarks to assess the effectiveness of the cationic activator system. The cationic activator/hydrogen peroxide bleaching system was found to provide comparable fabric whiteness in pad batch processes at much shorter reaction times. In addition to shorter bleaching cycles, potential benefits include improved fabric physical properties and simpler bleach formulas.

6. TITLE Bacteria from a Cow's Stomach May be Future Source for Wood Adhesive
AUTHOR Ondrey, Gerald
SOURCE Chemical Engineering, August 2004, vol. 111, no. 8, pp. 15-16
ABSTRACT Scientists from the US Dairy Forage Research Center have discovered an all-natural adhesive that has the potential to replace up to 45% of the petroleum-based, phenol-formaldehyde (PF) resin currently used to bond multiple layers of wood together.

7. TITLE Pulp-Bleaching Enzyme
AUTHOR Ondrey, Gerald
SOURCE Chemical Engineering, August 2004, vol. 111, no. 8, p. 15
ABSTRACT Diversa Corp launched a second new enzyme in as many months, this one for improving the cost and quality of pulp processing. Luminase is a xylanase enzyme that improves the reactivity of pulp fiber to bleaching chemicals, such as chlorine dioxide. The enzyme reduces the need for ClO2 by as much as 28%, says the firm. Compared to other enzyme products, Luminase can be used over a wider range of time, temperature and alkalinity, says Diversa.

8. TITLE Biopolymers Could Grow More Attractive
AUTHOR Hoffman, John
SOURCE Chemical Market Reporter, June 14, 2004, vol. 265, no. 24, p. 6
ABSTRACT The manufacture of large-volume plastics from biological materials and other renewable resources remains in its infancy, although the run-up in oil, natural gas and petrochemical feedstock costs is strengthening interest in biopolymers. Technological innovations continue to lower the cost of making biopolymers, and sales of these materials are expected to benefit from the public perception that they are more benign for the environment. Interest in biopolymers is also being fueled by speculation that the demand for oil and natural gas may outstrip supplies in coming decades, making biopolymers more attractive economically.

9. TITLE Nantero to Move Nanotubes into Computer Chips
AUTHOR McCoy, Michael
SOURCE Chemical & Engineering News, June 14, 2004, vol. 82, no. 24, p. 14
ABSTRACT Nantero, a nanotechnology start-up firm, is working with the semiconductor manufacturer LSI Logic to incorporate carbon nanotubes into high-end computer chips. If these chips go commercial next year as expected, they will represent one of the first uses of carbon nanotubes outside of the product reinforcement realm.

10. TITLE New Flame Retardant TPVs for Electrical Applications: New Grades of FR-TPVs Show Promise for Jacketing Purposes as Well as for Insulation Where Lead-Free Formulations are Needed
AUTHOR Anthony George; Pfeiffer, Joseph
SOURCE Wire Journal International, Vol. 37, No. 8, August, 2004, pp. 64 - 68
ABSTRACT Wire and cable are encapsulated with various materials to meet a range of needs. Examples include insulation from stray currents, flexibility for working of the wire and cable, resistance to abrasion, and the ability to withstand the environment conditions to which the wire and cable are subjected. Encapsulation of wire and cable has a long history steeped in innovation. In the late 1700s the first telegraph wires were reportedly wrapped in paper. In the 1880s, encapsulation of telegraph wires evolved to the advent of grooved wooden rail and covers. The first insulation of wire from moisture came in 1849 with the use of gutta percha, a plastic based on latex from Malaysian trees. It was chosen because, unlike paper and wood, its elasticity vastly improved sealing and workability of the wire and cable. Since the 1950s, encapsulation was further improved through materials such as PVC, PE, and EPDM.

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